CN209946507U - Full-color night-vision inner focusing lens - Google Patents
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- CN209946507U CN209946507U CN201920677727.1U CN201920677727U CN209946507U CN 209946507 U CN209946507 U CN 209946507U CN 201920677727 U CN201920677727 U CN 201920677727U CN 209946507 U CN209946507 U CN 209946507U
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Abstract
A full-color night-vision inner focusing lens comprises the following components in sequence from an object side to an image side: a first lens with positive focal power, a second lens with positive focal power and a third lens group with a diaphragm and positive focal power; the third lens group includes: at least one double cemented lens, one triple cemented lens and a diaphragm, wherein: the diaphragm is positioned between the cemented doublet and the cemented triplet. The utility model can make the aperture reach 0.6, and greatly improve the color monitoring imaging level at night; the imaging quality is greatly improved by using a double-gluing-aperture-triple-gluing structure; the single lens of the second lens group is adopted for focusing, so that the problem of the depth of field of the full-color night vision lens is solved, the use distance can reach the range from 20m to infinity, and the problem that the driving force of a motor of a focusing group is not enough is also solved. Compare in infrared light filling device, the utility model discloses then reduced device volume and cost greatly.
Description
Technical Field
The utility model relates to a technique in the optical device field specifically is a full-color night vision internal focusing camera lens.
Background
The night security is increasingly important, and the phenomenon causes the security industry to have higher and higher requirements on the night imaging capability of the monitoring lens. The problem that the imaging capacity at night is not enough is usually solved to prior art adoption infrared imaging technique, opens the infrared lamp light filling when ambient light at night is low, uses infrared mode to shoot. The following problems exist with infrared imaging: only black and white images and no color information are available; susceptible to heat sources; the infrared module of the camera generates heat seriously, and limits the use environment and the imaging performance; the infrared imaging technology needs an infrared lamp for light supplement, so that the size and the cost of the device are increased. The existing full-color night vision lens is poor in performance due to the fact that the aperture is too large, and the using requirements of the security industry at the present stage are difficult to meet.
SUMMERY OF THE UTILITY MODEL
The utility model provides a to the above-mentioned not enough that prior art exists, provide a full-color night vision internal focusing camera lens, the light ring is 0.6 internal focusing camera lens, uses the structure of two veneer-light ring-three plys, has solved the poor problem of colour difference and imaging quality.
The utility model discloses a realize through following technical scheme:
the utility model discloses include from the thing side to picture side in proper order: the lens system comprises a first lens with positive focal power, a second lens with positive focal power and a third lens group with a diaphragm and with positive focal power.
The total focal length of the inner focusing lens ranges from (30,40) mm.
The second lens is a convex lens which is movably arranged to adjust the inner focus, and the range of the ratio of the focal length to the total focal length is (4, 10).
The third lens group includes: at least one double cemented lens, one triple cemented lens and a diaphragm, wherein: the diaphragm is positioned between the cemented doublet and the cemented triplet.
The focal length range of the last lens of the third lens group is (-0.01,0.01) mm.
The double-cemented lens is formed by sequentially cementing a convex lens and a concave lens, and the refractive index range of the double-cemented lens is (1.4, 1.5).
The three-cemented lens consists of two convex lenses and a concave lens, the concave lens is positioned between the two convex lenses, and the Abbe number of the convex lens close to the object side is (81, 96).
Technical effects
Compared with the prior art, the utility model can make the aperture reach 0.6, and greatly improve the color monitoring imaging level at night; the imaging quality is greatly improved by using a double-gluing-aperture-triple-gluing structure; the single lens of the second lens group is adopted for focusing, so that the problem of the depth of field of the full-color night vision lens is solved, the use distance can reach the range from 20m to infinity, and the problem that the driving force of a motor of a focusing group is not enough is also solved. Compare in infrared light filling device, the utility model discloses then reduced device volume and cost greatly.
Drawings
FIG. 1 is a schematic structural view of example 1;
FIG. 2 is a schematic performance diagram of example 1;
FIG. 3 is a schematic structural view of example 2;
FIG. 4 is a performance diagram of example 2;
FIG. 5 is a schematic structural view of example 3;
FIG. 6 is a performance diagram of example 3;
in the figure: the lens system comprises a first lens G1, a second lens G2, a third lens group G3, a diaphragm STP, protective glass CG, an imaging surface IMG, a double cemented lens L301, a triple cemented lens L302, a third lens L303, a fourth lens L304, a fifth lens L305, a double cemented front lens L3011, a double cemented rear lens L3012, a triple cemented front lens L3021, a triple cemented middle lens L3022, a triple cemented rear lens L3023, a fifth lens front lens L3051, a fifth lens rear lens L3052, a first lens front lens G11, a first lens rear lens G12, a third lens front lens L3031, a third lens rear lens L3032, a fourth lens front lens L3041 and a fourth lens rear lens L3042.
Detailed Description
Example 1
As shown in fig. 1, the present embodiment includes, in order from the object side to the image side: a first lens G1 having positive optical power, a second lens G2 having positive optical power, and a third lens group G3 having positive optical power with a stop STP.
The first lens G1 is a convex lens.
The second lens G2 is a convex lens movably arranged to adjust the inner focus of the lens.
The third lens group G3 sequentially comprises: a double cemented lens L301 with negative power, a diaphragm STP, a triple cemented lens L302 with positive power, a third lens L303 with positive power, a fourth lens L304 with positive power and a fifth lens L305 with negative power.
And protective glass CG is arranged between the third lens group G3 and the imaging surface IMG.
The double-cemented lens L301 is formed by sequentially cementing a double-cemented front lens L3011 with positive focal power and a double-cemented rear lens L3012 with negative focal power.
The three cemented lens L302 is formed by sequentially cementing a three cemented front lens L3021 with positive focal power, a three cemented middle lens L3022 with negative focal power, and a three cemented rear lens L3023 with positive focal power.
The fifth lens L305 is a cemented lens composed of two convex lenses, which are respectively a front lens L3051 of the fifth lens and a rear lens L3052 of the fifth lens.
Hereinafter, various data values of the present embodiment are shown, in which: the total focal length of the lens is f, the parameter of the stop STP is FNO, the range of the ratio of the focal length of the second lens G2 to the total focal length of the lens is (f2/f, the focal length of the last lens of the third lens group G3 is fL, the refractive index of the convex lens of the double cemented lens L301 is nd1, the abbe number of the front convex lens of the triple cemented lens L302 is vd2, and the field angle of the lens is FOV.
Table 1 the lens of embodiment 1 satisfies the following parameters
| f | FNO. | f2/f | fL | nd1 | vd2 | FOV |
| 36.8mm | 0.6 | 8.3 | -110mm | 1.44 | 81.61 | 11.3° |
TABLE 2 optical construction parameters (units: mm) for each lens of example 1
| Noodle numbering | Radius of curvature | Center thickness | Refractive index | Abbe number | |
| 1 | Spherical surface | 59.06 | 8.22 | 1.95 | 17.98 |
| 2 | Spherical surface | 272.60 | D1 | ||
| 3 | Spherical surface | 56.29 | 2.81 | 1.72 | 28.76 |
| 4 | Spherical surface | 73.79 | D2 | ||
| 5 | Spherical surface | 39.77 | 9.71 | 1.44 | 95.1 |
| 6 | Spherical surface | -75.93 | 1.30 | 1.95 | 17.98 |
| 7 | Spherical surface | 28.19 | 6.53 | ||
| 8 | Plane surface | Infinite number of elements | 0.80 | ||
| 9 | Spherical surface | 43.35 | 12.60 | 1.5 | 81.61 |
| 10 | Spherical surface | -25.08 | 2.30 | 1.81 | 22.76 |
| 11 | Spherical surface | 27.98 | 16.00 | 1.78 | 48.74 |
| 12 | Spherical surface | -84.72 | 3.74 | ||
| 13 | Spherical surface | 347.00 | 4.82 | 1.97 | 30.89 |
| 14 | Spherical surface | -77.61 | 0.10 | ||
| 15 | Spherical surface | 38.59 | 5.55 | 1.95 | 17.98 |
| 16 | Spherical surface | 888.17 | 0.10 | ||
| 17 | Spherical surface | 13.40 | 5.47 | 2 | 29.13 |
| 18 | Spherical surface | 17.36 | 0.80 | 1.81 | 22.76 |
| 19 | Spherical surface | 8.28 | 6.66 | ||
| 20 | Plane surface | Infinite number of elements | 0.80 | 1.52 | 64.2 |
| 21 | Plane surface | Infinite number of elements | 1.00 |
The image side surface of the double-cemented front lens L3011 of the double-cemented lens L301 is the object side surface of the double-cemented rear lens L3012, the image side surface of the triple-cemented front lens L3021 is the object side surface of the triple-cemented middle lens L3022, the image side surface of the triple-cemented middle lens L3022 is the object side surface of the triple-cemented rear lens L3023, and the image side surface of the fifth lens front lens L3051 is the object side surface of the fifth lens rear lens L3052.
The table D1 and D2 used different center thicknesses in the environment of use distances of infinity, 50m away and 18m away, respectively, as follows:
table 3 example 1 change in the values of D1 and D2 in table 2
| Infinite number of elements | 50m | 18m | |
| D1 | 12.12 | 11.88 | 11.45 |
| D2 | 0.30 | 0.54 | 0.98 |
As shown in FIG. 2, the axial chromatic aberration of the present embodiment is less than 0.005mm, and the color performance is excellent. Meanwhile, the low-illumination lens has small curvature of field and small astigmatism which are rarely seen in the low-illumination lens, so that the full-field all has high resolution, the optical performance is uniform, and the high-resolution low-illumination lens is more suitable for mass production. It can be seen from the figure that the optical distortion of the design is less than 1%, and the requirement of the distortion-free lens is met.
Example 2
As shown in fig. 3, compared to embodiment 1, the first lens G1 of the present embodiment is a cemented lens composed of a first lens front lens G11 having positive refractive power and a first lens rear lens G12 having negative refractive power, and the third lens L303 is a cemented lens composed of a third lens front lens L3031 and a third lens rear lens L3032.
The first lens G1 is changed into a cemented lens, which is beneficial to reducing the focal length, increasing the field angle, reducing the chromatic aberration and improving the performance; changing the third lens L303 to a cemented lens is beneficial to correcting high field aberration, and the specific data is shown in the following table:
table 4 the lens of embodiment 2 satisfies the following parameters
| f | FNO. | f2/f | fL | nd1 | vd2 | FOV |
| 30mm | 0.63 | 4.6 | -377mm | 1.47 | 81.6 | 14° |
Where the focal length is reduced to 30mm and the field angle is expanded to 14 deg..
TABLE 5 optical construction parameters (unit: mm) for each lens of example 2
The image side surface of the first front lens piece G11 is the object side surface of the first rear lens piece G12, the image side surface of the double-cemented front lens piece L3011 of the double-cemented lens piece L301 is the object side surface of the double-cemented rear lens piece L3012, the image side surface of the triple-cemented front lens piece L3021 is the object side surface of the triple-cemented middle lens piece L3022, the image side surface of the triple-cemented middle lens piece L3022 is the object side surface of the triple-cemented rear lens piece L3023, the image side surface of the third front lens piece L3031 is the object side surface of the third rear lens piece L3032, and the image side surface of the fifth front lens piece L3051 is the object side surface of the fifth rear lens piece L3052.
The table D1 and D2 used different center thicknesses in the environment of use distances of infinity, 50m away and 18m away, respectively, as follows:
table 6 example 2 change in values of D1 and D2 in table 5
| Infinite number of elements | 50m | 18m | |
| D1 | 6.45 | 6.34 | 6.14 |
| D2 | 0.10 | 0.21 | 0.41 |
As shown in FIG. 4, the axial chromatic aberration of the present embodiment is less than 0.005mm, the color performance is excellent, and the use of the double cemented lens makes the chromatic aberration of large aperture better. Meanwhile, the lens has small curvature of field and small astigmatism which are rarely seen in a low-illumination lens, so that the full-field all has high resolution and uniform optical performance. The field curvature was larger than that of example 1, but the partial lens processability was improved and the mass productivity was higher than that of example 1. It can be seen from the figure that the optical distortion of the design is less than 1%, and the requirement of the distortion-free lens is met.
Example 3
As shown in fig. 5, in this embodiment, compared with embodiment 1, the third lens group G3 of this embodiment includes, in order: a double cemented lens L301, a diaphragm STP, a triple cemented lens L302, a third lens L303 and a fourth lens L304.
The third lens L302 is an aspheric lens, and the introduction of the aspheric lens is favorable for compensating the curvature of field of the lens.
The fourth lens L304 is a cemented lens composed of a front lens L3041 and a rear lens L3042.
Table 7 the lens of embodiment 3 satisfies the following parameters
| f | FNO. | f2/f | fL | nd1 | vd2 | FOV |
| 45mm | 0.64 | 7.7 | 325mm | 1.49 | 81.6 | 9.2° |
TABLE 8 optical construction parameters (units: mm) for each lens of example 3
The image-side surface of the double-cemented front lens L3011 of the double-cemented lens L301 is the object-side surface of the double-cemented rear lens L3012, the image-side surface of the triple-cemented front lens L3021 is the object-side surface of the triple-cemented middle lens L3022, the image-side surface of the triple-cemented middle lens L3022 is the object-side surface of the triple-cemented rear lens L3023, and the image-side surface of the fourth lens front lens L3041 is the object-side surface of the fourth lens rear lens L3042.
The table D1 and D2 used different center thicknesses in the environment of use distances of infinity, 50m away and 18m away, respectively, as follows:
table 9 example 3 changes in the values of D1 and D2 in table 8
| Infinite number of elements | 50m | 18m | |
| D1 | 13.66 | 13.38 | 12.86 |
| D2 | 0.27 | 0.56 | 1.08 |
Table 10 example 3 coefficients for aspheric lens in table 8
As shown in FIG. 6, the axial chromatic aberration of the present embodiment is less than 0.005mm, and the color performance is excellent. Meanwhile, the low-illumination lens has small curvature of field and small astigmatism which are rarely seen in the low-illumination lens, so that the full-field all has high resolution, the optical performance is uniform, and the high-resolution low-illumination lens is more suitable for mass production. The aspheric lens is used, distortion is further reduced, optical distortion is less than 0.5%, distortion change is smaller than that of a common distortion-free lens, reduction degree is higher, and the grade of an industrial lens is achieved.
The foregoing embodiments may be modified in various ways by those skilled in the art without departing from the spirit and scope of the present invention, which is not limited by the above embodiments but is to be accorded the full scope defined by the appended claims, and all such modifications and variations are within the scope of the invention.
Claims (8)
1. A full-color night-vision inner focusing lens is characterized by comprising the following components in sequence from an object side to an image side: a first lens with positive focal power, a second lens with positive focal power and a third lens group with a diaphragm and positive focal power; the third lens group includes: at least one double cemented lens, one triple cemented lens and a diaphragm, wherein: the diaphragm is positioned between the cemented doublet and the cemented triplet.
2. The full-color night vision internal focusing lens of claim 1, wherein the second lens is a convex lens movably arranged to adjust the internal focusing, and the ratio of the focal length to the total focal length is in the range of (4, 10).
3. The full-color night vision inner focusing lens of claim 1, wherein the focal length of the last lens of the third lens group is (-0.01,0.01) mm.
4. The full-color night vision inner focusing lens of claim 1, wherein the double-cemented lens is formed by sequentially cementing a convex lens and a concave lens, and the refractive index range is (1.4, 1.5).
5. The full-color night vision inner focusing lens of claim 1, wherein the triple cemented lens is composed of two convex lenses and a concave lens, the concave lens is located between the two convex lenses, and the abbe number of the convex lens near the object side is (81, 96).
6. The full-color night vision inner focusing lens of claim 1, wherein the total focal length of the inner focusing lens is in the range of (30,40) mm.
7. The full-color night vision inner focusing lens of any one of the preceding claims, which is realized by any one of the following structures:
① an object side surface of the first lens element is spherical, a radius of curvature is 59.06mm, a thickness of the first lens element is 8.22mm, a refractive index is 1.95, an abbe number is 17.98, an image side surface of the first lens element is spherical, a radius of curvature is 272.6mm, a distance from the image side surface of the first lens element to the object side surface of the second lens element is D1mm, an object side surface of the second lens element is spherical, a radius of curvature is 56.29mm, a thickness of the second lens element is 2.81mm, a refractive index is 1.72, an abbe number is 28.76, an image side surface of the second lens element is spherical, a radius of curvature is 73.79mm, a distance from the image side surface of the second lens element to the object side surface of the doublet cemented lens element is D2mm, an object side surface of the doublet cemented lens element of the third lens element is spherical, a radius of curvature 39.77mm, a thickness of the doublet cemented front cemented aspheric surface is 9.71mm, a refractive index is 1.44, an abbe number is 95.1.1.1.1 mm, a aspheric surface of a cemented aspheric surface, a cemented aspheric surface of a cemented fourth cemented lens element is 1.8, a cemented lens element, a cemented aspheric surface of a cemented lens element is 2, a cemented aspheric surface of a cemented lens element is 1.7-cemented aspheric surface of a cemented aspheric surface of a cemented lens element, a cemented aspheric surface of a cemented aspheric surface of a cemented lens element of cemented aspheric surface of cemented lens element of cemented lens;
② an object side surface of the first lens is spherical, a radius of curvature is 70.05mm, a thickness of a front lens of the first lens is 9.42mm, a refractive index is 1.94, an abbe number is 18.1, a cemented surface of the first lens is spherical, a radius of curvature is-981.98 mm, a distance from a cemented surface of the first lens to an image side surface is 1.75mm, a refractive index is 1.5, an abbe number is 81.61, an image side surface of the first lens is spherical, a radius of curvature is 148.99mm, a distance from an image side surface of the first lens to an object side surface of the second lens is D1mm, an object side surface of the second lens is spherical, a radius of curvature is 58.17mm, a thickness of the second lens is 4.44mm, a refractive index is 1.85, an abbe number is 19.44, an image side surface of the second lens is spherical, a radius of curvature 109.78mm, a radius of a cemented surface of the second lens is 19.44, a cemented surface of the third lens, a cemented surface is a cemented surface of cemented lens, a cemented surface is a cemented surface of cemented lens, a cemented surface of a cemented lens, a cemented lens is a cemented lens, a cemented lens is a cemented lens, a cemented lens with a third lens, a cemented lens with a cemented lens, a cemented lens with a cemented lens, a cemented lens has a cemented lens, a lens with a cemented lens has a lens, a cemented lens, a lens has a lens, a lens has a lens, a lens has a lens;
③ an object side surface of the first lens element is spherical, a radius of curvature is 58.88mm, a thickness of the first lens element is 10.93mm, a refractive index is 1.92, an abbe number is 20.21, an image side surface of the first lens element is spherical, a radius of curvature is 209.07mm, a distance from the image side surface of the first lens element to the object side surface of the second lens element is D1mm, an object side surface of the second lens element is spherical, a radius of curvature is 54.57mm, a thickness of the second lens element is 3.93mm, a refractive index is 1.62, an abbe number is 51.99, an image side surface of the second lens element is spherical, a radius of curvature is 71.02mm, a distance from the image side surface of the second lens element to the object side surface of the double cemented lens element is D2mm, an object side surface of the double cemented lens element of the third lens element is spherical, a radius 40.53mm, a thickness of the double cemented aspheric cemented lens element is 11.06mm, a radius of a refractive index of 1.49, an abbe number is 63.69 mm, a spherical surface of the cemented aspheric cemented third cemented aspheric cemented lens element is 1.7mm, a cemented aspheric cemented lens element, a cemented aspheric cemented lens element is 1.7mm, a cemented aspheric cemented lens element is 1.7mm, a cemented aspheric cemented lens element is 1.7mm, a cemented aspheric cemented lens element 7-7 mm, a cemented aspheric cemented lens 21, a cemented aspheric cemented lens, a cemented aspheric cemented lens 26, 7-7, a cemented aspheric cemented lens 1.7, 1.7-7, 1.7-7, 1.7, 7-7, 1.7, 1, 1.7, 7, 1.7, 1, cemented 19, 1, 1.7, cemented 19, 1, 7, 1.7, cemented 19, 1.7-7, cemented 19, cemented 5, cemented 19, 1.7, cemented 5, cemented 5.7-7, cemented 19.
8. The full-color night vision inner focusing lens of claim 7, wherein the D1 and D2 are different center thicknesses used in an environment with a distance of infinity, 50m away and 18m away, respectively:
① D1 is 12.12mm and D2 is 0.30mm when the distance of use is infinity, D1 is 11.88mm and D2 is 0.54mm when the distance of use is 50m, D1 is 11.45mm and D2 is 0.98mm when the distance of use is 18 m;
② D1 is 6.45mm and D2 is 0.10mm when the distance of use is infinity, D1 is 6.34mm and D2 is 0.21mm when the distance of use is 50m, D1 is 6.14mm and D2 is 0.41mm when the distance of use is 18 m;
③ D1 was 13.66mm and D2 was 0.27mm when the distance of use was infinity, D1 was 13.38mm and D2 was 0.56mm when the distance of use was 50m, D1 was 12.86mm and D2 was 1.08mm when the distance of use was 18 m.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109975958A (en) * | 2019-05-13 | 2019-07-05 | 嘉兴中润光学科技有限公司 | Full-color night vision cohesion zoom lens |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109975958A (en) * | 2019-05-13 | 2019-07-05 | 嘉兴中润光学科技有限公司 | Full-color night vision cohesion zoom lens |
| CN109975958B (en) * | 2019-05-13 | 2024-02-06 | 嘉兴中润光学科技股份有限公司 | Full-color night vision inner focusing lens |
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Address after: 314000 No.188, Taojing Road, Gaozhao street, Xiuzhou District, Jiaxing City, Zhejiang Province Patentee after: Jiaxing Zhongrun Optical Technology Co.,Ltd. Address before: 314000 Room 2F201-6, Building 6, Jiaxing Photovoltaic Science Park, 1288 Kanghe Road, Xiuzhou District, Jiaxing City, Zhejiang Province Patentee before: JIAXING ZHONGRUN OPTICAL SCIENCE AND TECHNOLOGY Co.,Ltd. |
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