CN112363306A - Day and night zooming monitoring lens with high resolution and large target surface of 10-30mm and imaging method - Google Patents
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- 238000012544 monitoring process Methods 0.000 title claims abstract description 19
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- G02B15/144—Optical objectives with means for varying the magnification by axial movement of one or more lenses or groups of lenses relative to the image plane for continuously varying the equivalent focal length of the objective having four groups only
- G02B15/1441—Optical objectives with means for varying the magnification by axial movement of one or more lenses or groups of lenses relative to the image plane for continuously varying the equivalent focal length of the objective having four groups only the first group being positive
- G02B15/144113—Optical objectives with means for varying the magnification by axial movement of one or more lenses or groups of lenses relative to the image plane for continuously varying the equivalent focal length of the objective having four groups only the first group being positive arranged +-++
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Abstract
The invention relates to a high-resolution large-target-surface 10-30mm day and night zooming monitoring lens and an imaging method, wherein the high-resolution large-target-surface 10-30mm day and night zooming monitoring lens comprises a first lens group with positive focal power, a second lens group with negative focal power, an aperture diaphragm, a third lens group with positive focal power, a fourth lens group with positive focal power and an optical filter which are sequentially arranged along the incident direction of light rays.
Description
Technical Field
The invention relates to a day and night zoom monitoring lens with a high resolution and a large target surface of 10-30mm and an imaging method.
Background
At present, most of monitoring zoom systems are composed of all glass or a small number of glass aspheric lenses, and because the glass lenses and the glass aspheric lenses are high in cost, some optical properties can be sacrificed for controlling the cost, so that the system definition is not high, and the phenomena that complete confocal cannot be guaranteed due to infrared rays can occur in the zooming process. At present, most of monitoring lenses can only be used within the range of-20 ℃ to 60 ℃ in complex environments (high temperature and low temperature), and the high temperature and low temperature range is not enough, so that the requirements on the monitoring lenses increasingly can not be met.
Disclosure of Invention
The invention aims to provide a day and night zooming monitoring lens with a high resolution and a large target surface of 10-30mm and an imaging method.
The technical scheme of the invention is that the day and night zooming monitoring lens with high resolution and large target surface of 10-30mm comprises a first lens group with positive focal power, a second lens group with negative focal power, an aperture diaphragm, a third lens group with positive focal power, a fourth lens group with positive focal power and an optical filter which are sequentially arranged along the incident direction of light; the first lens group comprises a bonding group consisting of a positive focal power meniscus glass lens A-1 and a negative focal power meniscus glass lens A-2 and a positive focal power spherical glass lens A-3 which are arranged in sequence; the second lens group comprises a double-concave glass lens B-1 with negative focal power, a double-concave plastic aspheric glass lens B-2 with negative focal power and an aspheric plastic lens B-3 with positive focal power which are arranged in sequence; the third lens group comprises a biconvex glass lens D-1 with positive focal power, a plastic aspheric lens D-2 with positive focal power, an aspheric plastic lens D-3 with positive focal power and a plastic aspheric lens D-4 with negative focal power which are arranged in sequence; the fourth lens group comprises a biconvex glass lens E-1 with positive focal power, a plastic aspheric lens E-2 with negative focal power, a plastic aspheric lens E-3 with negative focal power and a plastic aspheric lens E-4 with positive focal power which are arranged in sequence.
Further, the interval between the second lens group and the aperture stop is L1, the interval between the third lens group and the fourth lens group is L2, the interval between the fourth lens group and the imaging surface is L3, and the intervals between L1, L2 and L3 satisfy: 0.7< L1<14,3.1< L2<5.8,3.1< L3< 5.8.
Furthermore, the refractive indexes (n1-n14) of the 14 lenses in sequence along the light incidence direction satisfy the following relations that 1.4-n 1 is not less than 1.9, 1.4-n 2 is not less than 1.8, 1.4-n 3 is not less than 1.8, 1.4-n 4 is not less than 1.8, 1.4-n 5 is not less than 1.7, 1.4-n 6 is not less than 1.7, 1.4-n 7 is not less than 1.8, 1.4-n 8 is not less than 1.7, 1.4-n 9 is not less than 1.7, 1.4-n 10 is not less than 1.7, 1.4-n 11 is not less than 1.8, 1.4-n 12 is not less than 1.7, 1.4-n 13 is not more than 1.7, and 1.4-n 14 is not less than 1.7.
Furthermore, the focal lengths (f1-f14) of the 14 lenses in sequence along the light incidence direction satisfy the following relations of 50 ≤ f1 ≤ 150, -100 ≤ f2 ≤ 50, 40 ≤ f3 ≤ 60, -20 ≤ f4 ≤ 5, -20 ≤ f5 ≤ 5, 10 ≤ f6 ≤ 25, 15 ≤ f7 ≤ 30, 25 ≤ f8 ≤ 40,10 ≤ f9 ≤ 30, -10 ≤ f10 ≤ 3, 10 ≤ f11 ≤ 30, -150 ≤ f12 ≤ 100, -180 ≤ f13 ≤ 120, and 20 ≤ f14 ≤ 30.
An imaging method of a day and night zoom monitoring lens with a high resolution and a large target surface of 10-30mm is characterized in that: the light rays sequentially pass through the first lens group, the second lens group, the aperture diaphragm, the third lens group, the fourth lens group and the optical filter and then are imaged.
Compared with the prior art, the invention has the following beneficial effects: the lens has wide high-low temperature range, day and night infrared confocal, long-focus end zooming, good imaging quality and low cost.
The invention is explained in further detail below with reference to the figures and the detailed description.
Drawings
Fig. 1 is an optical structure diagram of the lens.
In the figure: g1-first lens group; a-1-meniscus glass lens A-1; a-2-meniscus glass lens A-2; a-3-spherical glass lens A-3; g2-second lens group; b-1-double concave glass lens B-1; b-2-double concave plastic aspheric glass lens B-2; b-3-aspheric plastic lens B-3; c-aperture diaphragm; g3-third lens group; d-1-biconvex glass lens D-1; d-2-plastic aspheric lens D-2; d-3-aspheric plastic lens D-3; d-4-aspheric lens D-4; g4-fourth lens group; e-1-biconvex glass lens E-1; e-2-plastic aspheric lens E-2; e-3 aspheric plastic lens E-3-; e-4-plastic aspheric lens E-4; an IR filter.
Detailed Description
As shown in FIG. 1, the high-resolution large-target-surface 10-30mm day and night zoom monitoring lens comprises a first lens group G1 with positive focal power, a second lens group G2 with negative focal power, an aperture diaphragm C, a third lens group G3 with positive focal power, a fourth lens group G4 with positive focal power and an optical filter IR which are sequentially arranged along the incident direction of light rays; the first lens group comprises a bonding group consisting of a positive focal power meniscus glass lens A-1 and a negative focal power meniscus glass lens A-2 and a positive focal power spherical glass lens A-3 which are arranged in sequence; the second lens group comprises a double-concave glass lens B-1 with negative focal power, a double-concave plastic aspheric glass lens B-2 with negative focal power and an aspheric plastic lens B-3 with positive focal power which are arranged in sequence; the third lens group comprises a biconvex glass lens D-1 with positive focal power, a plastic aspheric lens D-2 with positive focal power, an aspheric plastic lens D-3 with positive focal power and a plastic aspheric lens D-4 with negative focal power which are arranged in sequence; the fourth lens group comprises a biconvex glass lens E-1 with positive focal power, a plastic aspheric lens E-2 with negative focal power, a plastic aspheric lens E-3 with negative focal power and a plastic aspheric lens E-4 with positive focal power which are arranged in sequence.
In this embodiment, the interval between the second lens group and the aperture stop is L1, the interval between the third lens group and the fourth lens group is L2, the interval between the fourth lens group and the imaging surface is L3, and the intervals between L1, L2 and L3 satisfy: 0.7< L1<14,3.1< L2<5.8,3.1< L3<5.8, which reasonably changes the position relation among the relative positions L1, L2, L3 of the lens groups through the drive of the moving horse, thereby realizing the optical zooming process. And the distances between the first lens group and the aperture stop and the distances between the third lens group and the image plane are always kept unchanged in the zooming process.
In the embodiment, the refractive indexes (n1-n14) of the 14 lenses in sequence along the light incidence direction satisfy the following relations that 1.4. ltoreq. n 1. ltoreq.1.9, 1.4. ltoreq. n 2. ltoreq.1.8, 1.4. ltoreq. n 3. ltoreq.1.8, 1.4. ltoreq. n 4. ltoreq.1.8, 1.4. ltoreq. n 5. ltoreq.1.7, 1.4. ltoreq. n 6. ltoreq.1.7, 1.4. ltoreq. n 7. ltoreq.1.8, 1.4. ltoreq. n 8. ltoreq.1.7, 1.4. ltoreq. n 9. ltoreq.1.7, 1.4. ltoreq. n 10. ltoreq.7, 1.4. ltoreq. n 11. ltoreq.1.8, 1.4. ltoreq. n 12. ltoreq.7, 1.4.
In the embodiment, the focal lengths (f1-f14) of the 14 lenses in sequence along the light incidence direction satisfy the following relations of 50 ≤ f1 ≤ 150, -100 ≤ f2 ≤ 50, 40 ≤ f3 ≤ 60, -20 ≤ f4 ≤ 5, -20 ≤ f5 ≤ 5, 10 ≤ f6 ≤ 25, 15 ≤ f7 ≤ 30, 25 ≤ f8 ≤ 40,10 ≤ f9 ≤ 30, -10 ≤ f10 ≤ 3, 10 ≤ f11 ≤ 30, -150 ≤ f12 ≤ 100, -180 ≤ f13 ≤ 120, and 20 ≤ f14 ≤ 30.
An imaging method of a day and night zoom monitoring lens with a high resolution and a large target surface of 10-30mm is characterized in that: the light rays sequentially pass through the first lens group, the second lens group, the aperture diaphragm, the third lens group, the fourth lens group and the optical filter and then are imaged.
In the embodiment, the lens can realize the zoom of 10mm to 30mm, and the angle of view is 10.2-42 degrees. Can satisfy the 1/2.7 'and 1/2.8' inches COMS chips of mainstream, and the resolving power is >4 MP. The range from 0.6m to infinity of the object distance can be monitored, and high imaging definition is ensured.
In this embodiment, the lens can realize a large aperture at both the wide end and the tele end, where the wide end (near focus) Fno is 1.6, the tele end (far focus) Fno is 1.6, the lens Fno is EFL/D, EFL is the focal length, and D is the aperture diameter; for the imaging lens, the larger the aperture diameter is, the larger the light flux amount is, and the better the imaging performance in dark environment such as night is. The typical monitor lens is fno >2.4 at the far focus end. Total length <52mm, small volume. The material can be used in high-temperature and low-temperature environment (-30 ℃ -80 ℃). The imaging range > is 6.6mm, the supported wavelength range is 430nm-850nm, and the day and night confocal monitoring use is met.
In the present embodiment, the optical parameters of each lens are as follows:
| number of noodles | Surface type | Radius R | Thickness of | | k value | |
| 1 | Spherical surface | 31.3 | 0.95 | 1.83 | 0.0 | |
| 2 | Spherical surface | 22.6 | 3.89 | 1.43 | 0.0 | |
| 3 | Spherical surface | -120.5 | 0.06 | 0.0 | ||
| 4 | Spherical surface | 20.7 | 2.99 | 1.49 | 0.0 | |
| 5 | Spherical surface | 178.8 | 13.48 | 0.0 | ||
| 6 | Spherical surface | -46.4 | 0.79 | 1.70 | 0.0 | |
| 7 | Spherical surface | 9.3 | 1.50 | 0.0 | ||
| 8 | Aspherical surface | -75.2 | 0.87 | 1.53 | 250.3 | |
| 9 | Aspherical surface | 8.6 | 0.07 | 0.7 | ||
| 10 | Aspherical surface | 9.5 | 1.65 | 1.64 | 2.4 | |
| 11 | Aspherical surface | 63.1 | 0.88 | 79.6 | ||
| Diaphragm | Plane surface | 0.73 | 0.0 | |||
| 13 | Spherical surface | 12.0 | 2.30 | 1.43 | 0.0 | |
| 14 | Spherical surface | -37.3 | 0.05 | 0.0 | ||
| 15 | Aspherical surface | 23.1 | 1.52 | 1.64 | -6.0 | |
| 16 | Aspherical surface | -143.3 | 0.05 | -318.1 | ||
| 17 | Aspherical surface | 7.0 | 2.35 | 1.53 | -1.7 | |
| 18 | Aspherical surface | 78.0 | 0.05 | 93.9 | ||
| 19 | Aspherical surface | 153.0 | 1.08 | 1.64 | 536.4 | |
| 20 | Aspherical surface | 4.0 | 5.49 | -0.6 | ||
| 21 | Spherical surface | 10.1 | 1.74 | 1.43 | 0.0 | |
| 22 | Spherical surface | -35.5 | 0.07 | 0.0 | ||
| 23 | Aspherical surface | 15.9 | 0.80 | 1.64 | -6.7 | |
| 24 | Aspherical surface | 13.0 | 0.73 | -4.2 | ||
| 25 | Aspherical surface | -3.9 | 1.01 | 1.64 | -8.5 | |
| 26 | Aspherical surface | -4.5 | 0.05 | -7.4 | ||
| 27 | Aspherical surface | 4.9 | 1.29 | 1.53 | -0.8 | |
| 28 | Aspherical surface | 6.9 | 3.42 | -0.1 |
The aspheric lens surface equation is as follows:
in the formula, the parameter c is the curvature corresponding to the radius, r is the radial coordinate, the unit of the radial coordinate is the same as the unit of the lens length, k is the coefficient of a conical quadratic curve, when the k coefficient is less than-1, the surface-shaped curve is a hyperbolic curve, when the k coefficient is equal to-1, the curve is a parabola, when the k coefficient is between-1 and 0, the curve is an ellipse, when the k coefficient is equal to 0, the curve is a circle, when the k coefficient is greater than 0, the curve is an oblate, and alpha 1 to alpha 8 respectively represent the coefficients corresponding to the radial coordinates, and the shape and the size of the aspheric lens can be accurately set through the parameters.
| Number of noodles | A2 parameter | A3 parameter | A4 parameter | A5 parameter | A6 parameter | A7 parameter |
| 8 | -4.7E-04 | -6.6E-06 | 8.4E-07 | -1.7E-09 | -1.7E-09 | 6.4E-11 |
| 9 | -7.9E-04 | -6.8E-06 | -5.6E-07 | 2.1E-08 | -4.7E-10 | 2.7E-12 |
| 10 | -7.3E-04 | -1.1E-06 | -8.8E-07 | 2.0E-08 | 3.9E-10 | -4.3E-11 |
| 11 | -4.5E-04 | 9.2E-06 | 1.4E-07 | 1.6E-08 | -8.1E-10 | 1.8E-11 |
| 15 | -8.9E-06 | -1.7E-05 | -2.8E-07 | 2.1E-08 | -6.7E-10 | 9.2E-12 |
| 16 | -3.9E-04 | -8.6E-06 | 5.8E-07 | -2.1E-08 | 1.5E-10 | 3.2E-12 |
| 17 | -5.5E-04 | -1.2E-05 | 7.2E-07 | 4.0E-08 | -7.7E-10 | -3.5E-11 |
| 18 | -1.3E-03 | -5.7E-06 | 6.6E-06 | -2.7E-07 | -5.9E-10 | 1.5E-10 |
| 19 | -1.9E-04 | -4.4E-05 | 5.8E-06 | -1.8E-07 | -5.2E-09 | 3.0E-10 |
| 20 | 4.3E-05 | -7.3E-05 | -1.3E-06 | 3.9E-07 | -3.0E-08 | 1.3E-09 |
| 23 | -3.6E-03 | -3.0E-05 | 1.0E-05 | -2.8E-07 | -2.4E-08 | 1.1E-09 |
| 24 | -3.9E-03 | -7.5E-06 | 2.1E-06 | 3.0E-07 | -2.7E-08 | 6.9E-10 |
| 25 | 1.9E-03 | -2.8E-04 | 1.9E-05 | -2.2E-07 | -2.4E-08 | 7.4E-10 |
| 26 | -5.8E-04 | 1.1E-05 | 6.7E-06 | -6.1E-08 | -2.0E-08 | 6.4E-10 |
| 27 | -1.0E-02 | 6.6E-04 | -2.9E-05 | 2.3E-07 | 3.9E-08 | -1.3E-09 |
| 28 | -9.2E-03 | 6.9E-04 | -5.1E-05 | 2.4E-06 | -6.3E-08 | 5.8E-10 |
In this embodiment, the front two lenses of the first lens group are glass cemented lenses, the first lenses of the second, third and fourth lens groups are glass spherical lenses to ensure clear imaging in high and low temperature environments, and the rear lenses are plastic aspherical lenses to correct and balance the aberration of the whole system, thereby ensuring clear imaging of visible light and infrared confocal images and reducing the cost of the whole imaging system.
In this embodiment, the first lens group is formed by combining a cemented lens formed by combining two glass lenses and a positive focal glass lens, and achieves good convergence of light entering the system and correction of chromatic aberration of the system by reasonably distributing the combination of focal power among the lenses, refractive index of glass material and abbe number; the second lens group and the fourth lens group are mutually matched in the zooming process, the spherical aberration of the system is corrected, the infrared confocal second lens group and the first lens of the fourth lens group are guaranteed to be all glass spherical lenses, the glass expansion coefficient is small, the lens deformation is small when the temperature is changed severely at high and low temperatures, the deflection change of light rays entering the lens group is greatly reduced, and the clear imaging under the high-temperature and low-temperature environments is guaranteed. The last three lenses of the fourth lens group adopt plastic aspheric lenses to correct system distortion, so that the included angle of emergent rays from the system to the chip is not too large and less than 5 degrees, the relative illumination of the edge field is ensured due to the small included angle, and the uniformity of the brightness of the whole lens field is improved; the first lens of the third lens group also adopts a glass lens to ensure that the light rays entering the lens group do not change too much at high and low temperatures, thereby ensuring the imaging definition; the last three lenses adopt plastic aspheric lenses to correct the high-order aberration and chromatic aberration of the system, and the aberration of the whole system is well balanced; the first lens also adopts a glass lens to ensure that the light rays entering the lens group do not change too much at high and low temperatures, thereby ensuring the imaging definition; the last three lenses adopt plastic aspheric lenses to correct the high-order aberration and chromatic aberration of the system, and the aberration of the whole system is well balanced.
In the embodiment, the lens reasonably combines a plastic aspheric surface and a glass lens, and can ensure clear imaging without virtual focus within the temperature range of-30-80 ℃.
The above description is only a preferred embodiment of the present invention, and all equivalent changes and modifications made in accordance with the claims of the present invention should be covered by the present invention.
Claims (5)
1. A high-resolution large target surface 10-30mm day and night zooming monitoring lens is characterized in that: the lens comprises a first lens group with positive focal power, a second lens group with negative focal power, an aperture diaphragm, a third lens group with positive focal power, a fourth lens group with positive focal power and an optical filter which are sequentially arranged along the incident direction of light rays; the first lens group comprises a bonding group consisting of a positive focal power meniscus glass lens A-1 and a negative focal power meniscus glass lens A-2 and a positive focal power spherical glass lens A-3 which are arranged in sequence; the second lens group comprises a double-concave glass lens B-1 with negative focal power, a double-concave plastic aspheric glass lens B-2 with negative focal power and an aspheric plastic lens B-3 with positive focal power which are arranged in sequence; the third lens group comprises a biconvex glass lens D-1 with positive focal power, a plastic aspheric lens D-2 with positive focal power, an aspheric plastic lens D-3 with positive focal power and a plastic aspheric lens D-4 with negative focal power which are arranged in sequence; the fourth lens group comprises a biconvex glass lens E-1 with positive focal power, a plastic aspheric lens E-2 with negative focal power, a plastic aspheric lens E-3 with negative focal power and a plastic aspheric lens E-4 with positive focal power which are arranged in sequence.
2. The large target surface of high resolution 10-30mm day and night zoom monitoring lens of claim 1, characterized in that: the interval between the second lens group and the aperture stop is L1, the interval between the third lens group and the fourth lens group is L2, the interval between the fourth lens group and the imaging surface is L3, and the intervals between L1, L2 and L3 satisfy: 0.7< L1<14,3.1< L2<5.8,3.1< L3< 5.8.
3. The large target surface of high resolution 10-30mm day and night zoom monitoring lens of claim 1, characterized in that: the refractive indexes (n1-n14) of the 14 lenses in sequence along the incident direction of light rays satisfy the following relational expressions that 1.4-n 1 is less than or equal to 1.9, 1.4-n 2 is less than or equal to 1.8, 1.4-n 3 is less than or equal to 1.8, 1.4-n 4 is less than or equal to 1.8, 1.4-n 5 is less than or equal to 1.7, 1.4-n 6 is less than or equal to 1.7, 1.4-n 7 is less than or equal to 1.8, 1.4-n 8 is less than or equal to 1.7, 1.4-n 9 is less than or equal to 1.7, 1.4-n 10 is less than or equal to 1.7, 1.4-n 11 is less than or equal to 1.8, 1.4-n 12 is less than or equal to 1.7, 1.4-n 13 is less.
4. The large target surface of high resolution 10-30mm day and night zoom monitoring lens of claim 1, characterized in that: the focal lengths (f1-f14) of the 14 lenses in sequence along the light incidence direction satisfy the following relations that f1 is more than or equal to 50 and less than or equal to 150, f2 is more than or equal to 100 and less than or equal to-50, f3 is more than or equal to 40 and less than or equal to 60, f4 is more than or equal to-5, f5 is more than or equal to 20 and less than or equal to-5, f6 is more than or equal to 10 and less than or equal to 25, f7 is more than or equal to 15 and less than or equal to 30, f8 is more than or equal to 25 and less than or equal to 40, f9 is more than or equal to 10 and less than or equal to 30, f10 is more than or equal to-3, f 11.
5. An imaging method of a day and night zoom monitoring lens with a high resolution and a large target surface of 10-30mm is characterized in that: the light rays sequentially pass through the first lens group, the second lens group, the aperture diaphragm, the third lens group, the fourth lens group and the optical filter and then are imaged.
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| CN113917674A (en) * | 2021-10-28 | 2022-01-11 | 东莞市宇瞳光学科技股份有限公司 | Zoom lens |
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| CN109445079A (en) * | 2018-12-17 | 2019-03-08 | 东莞市宇瞳光学科技股份有限公司 | A kind of zoom lens and video camera |
| CN110441894A (en) * | 2019-08-09 | 2019-11-12 | 中山联合光电科技股份有限公司 | A kind of zoom lens |
| CN111123491A (en) * | 2019-12-19 | 2020-05-08 | 嘉兴中润光学科技有限公司 | Ultra-high definition resolution zoom lens |
| CN213780523U (en) * | 2020-11-30 | 2021-07-23 | 深圳融合光学科技有限公司 | High-resolution large-target-surface 10-30mm day and night zooming monitoring lens |
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| CN113917674A (en) * | 2021-10-28 | 2022-01-11 | 东莞市宇瞳光学科技股份有限公司 | Zoom lens |
| CN113917674B (en) * | 2021-10-28 | 2022-12-30 | 东莞市宇瞳光学科技股份有限公司 | Zoom lens |
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Effective date of registration: 20230928 Address after: 350301 Optoelectronic Technology Park, Rongqiao Economic and Technological Development Zone, Fuqing City, Fuzhou City, Fujian Province Applicant after: FUJIAN FUGUANG TIANTONG OPTICS Co.,Ltd. Address before: 6 / F, Juyou Business Center (Phoenix building), No.15, Keji North 1st Road, songpingshan community, Xili street, Nanshan District, Shenzhen, Guangdong 518000 Applicant before: Shenzhen fusion Optical Technology Co.,Ltd. |
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