CN111580253A - Day and night dual-purpose monitoring lens and monitoring device - Google Patents
Day and night dual-purpose monitoring lens and monitoring device Download PDFInfo
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- CN111580253A CN111580253A CN202010535493.4A CN202010535493A CN111580253A CN 111580253 A CN111580253 A CN 111580253A CN 202010535493 A CN202010535493 A CN 202010535493A CN 111580253 A CN111580253 A CN 111580253A
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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
- G02B13/0045—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 five or more lenses
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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
- G02B13/008—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras designed for infrared light
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Abstract
The invention provides a day and night monitoring lens and a monitoring device adopting the same, which have the advantages of simple structure, easy processing, high pixel, large aperture, good day and night confocal performance and less lenses, and sequentially comprise the following components from an object side to an image side along an optical axis: the first lens has negative focal power, 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 has positive focal power, the object side surface of the second lens is a concave surface, and the image side surface of the second lens is a convex surface; the third lens has negative 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 concave surface; the fourth lens has positive focal power, and the object side surface of the fourth lens is a convex surface, and the image side surface of the fourth lens is a convex surface; the fifth lens has positive focal power, the object side surface of the fifth lens is a convex surface, and the image side surface of the fifth lens is a convex surface; the sixth lens has negative focal power, the object side surface of the sixth lens is a concave surface, the image side surface of the sixth lens is a concave surface, and the F number F # of the optical lens of the day and night dual-purpose monitoring lens meets the following requirements: f # is more than or equal to 1.4 and less than or equal to 2.
Description
Technical Field
The invention relates to the technical field of optical imaging, in particular to a day and night dual-purpose monitoring lens and a monitoring device.
Background
With the rapid development of science and technology, people have higher technical requirements on security monitoring lenses. Most of fixed-focus monitoring lenses popular in the market at present have a series of problems of low resolution, small aperture, poor day and night confocality, more lenses and the like, so that the requirements on monitoring lenses with high pixels, large aperture, good day and night confocality and few lenses are more and more urgent.
Disclosure of Invention
In view of the above problems, the present invention provides a day and night monitoring lens and a monitoring device using the same, which has the advantages of simple structure, easy processing, high pixel, large aperture, good day and night confocality, and few lenses.
The technical scheme is as follows: a day and night monitoring lens sequentially comprises, from an object side to an image side along an optical axis: first lens, second lens, third lens, fourth lens, fifth lens and sixth lens, characterized in that:
the first lens has negative focal power, 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 has positive focal power, the object side surface of the second lens is a concave surface, and the image side surface of the second lens is a convex surface;
the third lens has negative 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 concave surface;
the fourth lens has positive focal power, the object side surface of the fourth lens is a convex surface, and the image side surface of the fourth lens is a convex surface;
the fifth lens has positive focal power, the object side surface of the fifth lens is a convex surface, and the image side surface of the fifth lens is a convex surface;
the sixth lens element has a negative focal power, and has a concave object-side surface and a concave image-side surface.
Wherein, the F number F # of the dual-purpose monitoring lens optical lens of day night satisfies: f # is more than or equal to 1.4 and less than or equal to 2.
The optical disc further comprises an optical diaphragm, a color filter and protective glass, wherein the optical diaphragm is arranged between the second lens and the third lens, the color filter is arranged on the image surface side of the sixth lens, and the protective glass is arranged on the image surface side of the color filter.
Furthermore, the first lens and the fourth lens are both glass spherical lenses, and the second lens, the third lens, the fifth lens and the sixth lens are all plastic aspheric lenses.
Further, the fifth lens and the sixth lens are cemented with each other to form a cemented lens set.
Further, the fifth lens and the sixth lens are separate lenses, respectively.
Further, the difference value of the abbe numbers V1 and V2 of at least two adjacent lenses of the day and night dual-purpose monitoring lens satisfies: 10 < | V1-V2| < 25, wherein V1 is the Abbe number of one of the lenses and V2 is the Abbe number of the other of the lenses.
Further, the day and night dual-purpose monitoring lens meets the following conditions:
0.12≤BFL/TTL≤0.32
the BFL is the distance from the center of the image side surface of the sixth lens of the day and night dual-purpose monitoring lens to the imaging surface of the day and night dual-purpose monitoring lens on the optical axis; TTL is a distance on the optical axis from the center of the object-side surface of the first lens element to the imaging surface of the day-night dual-purpose monitoring lens.
Further, the day and night dual-purpose monitoring lens meets the following conditions:
D/h/FOV≤0.03
the FOV is the maximum field angle of the day and night dual-purpose monitoring lens; d is the maximum clear aperture of the object-side surface of the first lens corresponding to the maximum field angle of the day and night dual-purpose monitoring lens; h is the image height corresponding to the maximum field angle of the day and night dual-purpose monitoring lens.
Further, the day and night dual-purpose monitoring lens meets the following requirements:
TTL/F≤4.0
(FOV×F)/h≥50
wherein, TTL is a distance from the center of the object side surface of the first lens to the imaging surface of the optical lens on the optical axis, F is a total focal length value of the monitoring lens for day and night use, FOV is a maximum viewing angle of the monitoring lens for day and night use, and h is an image height corresponding to the maximum viewing angle.
Further, the first lens also satisfies the following condition: nd1 is more than 1.4 and less than 1.6, and Vd1 is more than 60 and less than 70; wherein, the Nd1 is the optical refractive index of the first lens, and the Vd1 is the Abbe constant of the first lens;
the second lens further satisfies the following condition: nd2 is more than 1.5 and less than 1.7, and Vd2 is more than 50 and less than 70; wherein the Nd2 is the optical refractive index of the second lens, and the Vd2 is the Abbe constant of the second lens;
the third lens further satisfies the following condition: nd3 is more than 1.5 and less than 1.7, and Vd3 is more than 50 and less than 70; wherein the Nd3 is the optical refractive index of the third lens, and the Vd3 is the Abbe constant of the third lens;
the fourth lens further satisfies the following condition: nd4 is more than 1.4 and less than 1.6, and Vd4 is more than 60 and less than 80; wherein the Nd4 is the optical refractive index of the fourth lens, and the Vd4 is the Abbe constant of the fourth lens;
the fifth lens further satisfies the following condition: nd5 is more than 1.5 and less than 1.7, and Vd5 is more than 50 and less than 70; wherein the Nd5 is the optical refractive index of the fifth lens, and the Vd5 is the Abbe constant of the fifth lens;
the sixth lens further satisfies the following condition: nd6 is more than 1.6 and less than 1.8, Vd6 is more than 20 and less than 60; wherein, the Nd6 is the optical refractive index of the sixth lens, and the Vd6 is the Abbe constant of the sixth lens.
A monitoring device, characterized by: adopt the dual-purpose monitoring lens of day night of any one of foretell.
The utility model provides a dual-purpose surveillance lens of day night only uses six lens, compact structure, used lens number is few, the whole volume of camera lens has effectively been reduced, structure through each lens of rational design and to its positive and negative focal power distribution, the veneer state, the refracting index, the preferred of parameters such as abbe's coefficient, make the dual-purpose surveillance lens of day night's light ring reach F1.4, be superior to the product that most is F2.0 on the market, can have better formation of image performance under low illumination environment such as night, simultaneously through the axial colour difference of reduction system, realize the confocal function of day night of visible light and infrared light, in addition still have realized high pixel, the high advantage of imaging quality.
Drawings
FIG. 1 is a structural combination diagram of a day and night monitoring lens according to the present invention;
FIG. 2 is a graph showing the MTF of the day and night dual-purpose monitoring lens in the embodiment in the visible light band (435nm-656 nm);
FIG. 3 is a graph of MTF of the day and night dual-purpose monitoring lens in an embodiment in an infrared band (940 nm);
FIG. 4 is a graph showing the defocus of the day and night dual-purpose monitoring lens in the embodiment at 20 ℃ in the visible light band (435nm-656 nm);
FIG. 5 is a defocus graph of the day and night dual-purpose monitoring lens in the embodiment at 70 ℃ in the visible light band (435nm-656 nm);
FIG. 6 is a graph showing the defocus of the day and night dual-purpose monitoring lens in the embodiment at a visible light wavelength range (435nm-656nm) and 20 ℃.
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 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.
The invention provides a day and night dual-purpose monitoring lens, which sequentially comprises the following components from an object side to an image side along an optical axis: in fig. 1, the object side is located on the left side of the figure, the image side is located on the right side of the figure, and the first lens element 1, the second lens element 2, the third lens element 3, the fourth lens element 4, the fifth lens element 5 and the sixth lens element 6 are specifically:
the first lens element 1 has negative power, and has a convex object-side surface S1 and a concave image-side surface S2;
the second lens element 2 has positive power, and has a concave object-side surface S3 and a convex image-side surface S4;
the third lens element 3 has negative power, and has a convex object-side surface S6 and a concave image-side surface S7;
the fourth lens element 4 has positive power, and has a convex object-side surface S8 and a convex image-side surface S9;
the fifth lens element 5 has positive power, and has a convex object-side surface S10 and a convex image-side surface S11;
the sixth lens element 6 has a negative power, and has a concave object-side surface S12 and a concave image-side surface S13.
In the embodiment, the aperture of the day and night dual-purpose monitoring lens reaches F1.4, which is superior to most products with F2.0 on the market, and the monitoring lens has better imaging performance in low-illumination environments such as night.
In order to further optimize the performance of the optical lens, the monitoring lens for day and night use of the embodiment further includes an aperture 7, a color filter 8, and a protective glass 9, the aperture 7 is disposed between the second lens 2 and the third lens 3, the color filter 8 is disposed on the image plane side of the sixth lens 6, the filter 8 mainly functions to filter interference of an infrared band on imaging, the protective glass 9 is disposed on the image plane side of the color filter 8, and the protective glass 9 mainly functions to protect the image sensor.
In this embodiment, the first lens 1 and the fourth lens 4 are both glass spherical lenses, and the second lens 2, the third lens 3, the fifth lens 5 and the sixth lens 6 are plastic aspheric lenses, because the optimized space of the plastic aspheric lenses is large, compared with the full glass architecture in the prior art, the lens structure can be more compact, and by adopting the aspheric lens design, the formed image is effectively corrected, the problems of distortion in the visual field and the like are solved, and meanwhile, the lens is lighter, thinner and flatter.
In the embodiment, the fifth lens 5 and the sixth lens 6 are mutually cemented to form a group of cemented lenses, which can reduce the chromatic aberration of the system; of course, in other embodiments of the present invention, the fifth lens 5 and the sixth lens 6 may be separate lenses.
In this embodiment, the difference between abbe numbers V1 and V2 of at least two adjacent lenses of the day and night dual-purpose monitoring lens satisfies: 10 < | V1-V2| < 25, wherein V1 is the Abbe number of one lens, V2 is the Abbe number of the other lens, and concretely:
the first lens 1 also satisfies the following condition: nd1 is more than 1.4 and less than 1.6, and Vd1 is more than 60 and less than 70; wherein Nd1 is the optical refractive index of the first lens, and Vd1 is the Abbe constant of the first lens;
the second lens 2 also satisfies the following condition: nd2 is more than 1.5 and less than 1.7, and Vd2 is more than 50 and less than 70; wherein Nd2 is the optical refractive index of the second lens, and Vd2 is the Abbe constant of the second lens;
the third lens 3 also satisfies the following condition: nd3 is more than 1.5 and less than 1.7, and Vd3 is more than 50 and less than 70; wherein Nd3 is the optical refractive index of the third lens, and Vd3 is the Abbe constant of the third lens;
the fourth lens 4 also satisfies the following condition: nd4 is more than 1.4 and less than 1.6, and Vd4 is more than 60 and less than 80; wherein Nd4 is the optical refractive index of the fourth lens, and Vd4 is the Abbe constant of the fourth lens;
the fifth lens 5 also satisfies the following condition: nd5 is more than 1.5 and less than 1.7, and Vd5 is more than 50 and less than 70; wherein Nd5 is the optical refractive index of the fifth lens, and Vd5 is the Abbe constant of the fifth lens;
the sixth lens 6 also satisfies the following condition: nd6 is more than 1.6 and less than 1.8, Vd6 is more than 20 and less than 60; wherein Nd6 is the optical refractive index of the sixth lens, and Vd6 is the abbe constant of the sixth lens.
Through the reasonable collocation of the lenses, the high-Abbe-number lenses are adopted, the functions of chromatic aberration correction, temperature drift correction, infrared correction and the like can be realized, the compensation design is carried out by utilizing different temperature characteristics of the plastic lenses and the glass lenses, the focus temperature drift correction in a large temperature range is realized, the lens can adapt to complex temperature environments, can be used under different environmental conditions, and has wide market value.
In addition, in the embodiment, the day and night dual-purpose monitoring lens meets the following conditions:
0.12≤BFL/TTL≤0.32
the BFL is the distance from the center of the image side surface of the sixth lens of the day and night dual-purpose monitoring lens to the imaging surface of the day and night dual-purpose monitoring lens on the optical axis; TTL is the distance on the optical axis from the center of the object-side surface of the first lens element to the imaging surface of the day-night dual-purpose monitoring lens.
In this embodiment, the day and night dual-purpose monitoring lens meets the following conditions:
D/h/FOV≤0.03
wherein, the FOV is the maximum field angle of the day and night dual-purpose monitoring lens; d is the maximum clear aperture of the object side surface of the first lens corresponding to the maximum field angle of the day and night dual-purpose monitoring lens; h is the image height corresponding to the maximum field angle of the day and night dual-purpose monitoring lens.
In this embodiment, the day and night dual-purpose monitoring lens satisfies the following requirements:
TTL/F≤4.0
(FOV×F)/h≥50
wherein, TTL is a distance on an optical axis from the center of the object-side surface of the first lens element to the imaging surface of the optical lens, F is a total focal length of the day-night dual-purpose monitoring lens, FOV is a maximum viewing angle of the day-night dual-purpose monitoring lens, and h is an image height corresponding to the maximum viewing angle. Therefore, parameters such as the focal length and the maximum view field angle of the optical lens are controlled, so that the optical lens has relatively small optical distortion and image deformation in the imaging process, the imaging quality is ensured, the subsequent identification and judgment of imaging details are facilitated, and good image acquisition assistance is provided for security monitoring.
Based on the above explanation, the invention provides a monitoring lens with high pixel capacity of more than 200 ten thousand pixels, large aperture of FNO1.4, good day and night confocal performance of 430nm-940nm and less used lenses of 2G4P, through the combination of a glass lens and a plastic lens and the matching of the materials of the lenses, the 2G4P structural form is adopted to effectively solve the problem of inconsistent day and night confocal resolving power of the lens, and the day and night confocal lens only uses two glass lenses and four plastic aspheric surfaces on the premise of ensuring high resolution, so the lens has the advantages of obviously simplified structure, reduced lens weight and reduced production cost.
The optical parameters of the day and night dual-purpose monitoring lens of the embodiment are shown in table 1:
TABLE 1
When the radii of curvature of the surfaces of the diaphragm, the IR filter and the cover glass in Table 1 are Infinity, this surface is represented as a plane.
Optical performance parameters of the day and night dual-purpose monitoring lens of the embodiment are shown in table 2:
| parameter(s) | BFL | TTL(mm) | FOV(°) | D(mm) | H(mm) | F(mm) |
| Numerical value | 4.968 | 22.2 | 110 | 9.10 | 6.6 | 3.62 |
TABLE 2
In this embodiment, D/h/FOV is 0.0125 between the maximum field angle FOV of the day and night dual-purpose monitoring lens, the maximum clear aperture D of the object side surface S1 of the first lens 1 corresponding to the maximum field angle of the optical lens, and the image height h corresponding to the maximum field angle of the optical lens; the BFL/TTL between the optical back focus BFL of the optical lens and the optical total length TTL of the optical lens is 0.224; and the total optical length TTL of the optical lens, the maximum view field angle FOV of the optical lens and the image height h corresponding to the maximum view field angle of the optical lens satisfy the following conditions: TTL/h/FOV is 0.031.
In the present embodiment, the second lens 2, the third lens 3, the fifth lens 5, and the sixth lens 6 are all aspherical lenses, and respective aspherical surface types are described as follows:
where z (h) is a distance vector from the aspheric vertex when the aspheric surface has a height h in the optical axis direction, c is 1/r, r represents a curvature radius of the aspheric mirror surface, k is a conic coefficient, and A, B, C, D, E is an aspheric high-order coefficient.
The aspheric coefficients are specified in table 3 below:
| number of noodles | K | A | B | C | | E |
| S3 | ||||||
| 0 | 0 | -2.161e-4 | 6.739e-5 | 3.774e-7 | -5.369 | |
| S4 | ||||||
| 0 | 0 | 2.217e-3 | 1.235e-5 | 3.208e-6 | 3.983 | |
| S6 | ||||||
| 0 | 0 | 2.774e-3 | -3.149e-5 | -5.069e-6 | 1.371 | |
| S7 | ||||||
| 0 | 0 | 1.59e-3 | 5.494e-5 | -7.272e-7 | 1.522 | |
| S10 | ||||||
| 0 | 0 | -4.204e-4 | -5.374e-5 | -9.046e-6 | -3.767 | |
| S11 | ||||||
| 0 | 0 | 6.786e-4 | 2.977e-4 | -5.836e-5 | 6.155 | |
| S12 | ||||||
| 0 | 0 | 8.476e-3 | -7.88e-4 | 3.045e-5 | -3.157 | |
| S13 | ||||||
| 0 | 0 | 9.56e-3 | -6.614e-4 | 6.111e-5 | -1.535e-6 |
TABLE 3
An optical test is performed on the monitoring lens for day and night in the above embodiment, fig. 2 is an MTF graph of the monitoring lens for day and night in the above embodiment in a visible light band (435nm-656nm), fig. 3 is an MTF graph of the monitoring lens for day and night in the above embodiment in an infrared band (940nm), and in fig. 2 and 3, the abscissa is a spatial frequency and the ordinate is a contrast; limit is the diffraction limit in the meridian and sagittal directions, and TS 0.00(deg) represents the diffraction curve in the meridian and sagittal directions in the field of view of the image plane 0.00; MTF is a commonly used image quality evaluation index at present, and is called modulation transfer function. Modulation transfer function MTF: the ratio of the contrast of the image to the contrast of the object at a certain spatial frequency. The transmission capability of different spatial frequencies and different contrasts can be reflected. The modulation transfer function MTF can be used to represent the characteristics of the optical system, the larger the MTF is, the better the imaging quality of the system is, as can be seen from fig. 2 and 3, the day and night dual-purpose monitoring lens in this embodiment has a small distortion characteristic, which is enough to meet the requirement of image definition, and has good imaging stability.
FIG. 4 is a 20 ℃ defocusing graph of the day and night dual-purpose monitoring lens in the embodiment of the invention in a visible light band (435nm-656 nm); wherein, the abscissa is defocusing amount, and takes millimeter as a unit, and the ordinate is contrast; TS 0.00(deg) represents the diffraction curves in the meridional and sagittal directions at the image plane 0.00 field of view.
FIG. 5 is a 70 ℃ defocusing graph of the day and night dual-purpose monitoring lens in the embodiment of the invention in a visible light band (435nm-656 nm); wherein, the abscissa is defocusing amount, and takes millimeter as a unit, and the ordinate is contrast; TS 0.00(deg) represents the diffraction curves in the meridional and sagittal directions at the image plane 0.00 field of view.
FIG. 6 is a defocus graph of the day and night dual-purpose monitoring lens in the embodiment of the invention at visible light band (435nm-656nm) and 20 ℃; wherein, the abscissa is defocusing amount, and takes millimeter as a unit, and the ordinate is contrast; TS 0.00(deg) represents the diffraction curves in the meridional and sagittal directions at the image plane 0.00 field of view.
As can be seen from fig. 4, 5, and 6, the day and night dual-purpose monitoring lens in the embodiment of the present invention has a concentrated defocus curve in the visible light band, and it can be seen that the confocal degree is better, which means that the lens has a good resolving power and a temperature compensation function, and the high definition image quality of the lens is guaranteed to be unchanged within a temperature range of-20 ℃ to +70 ℃.
The invention further discloses a monitoring device which is used as the application of the optical lens and is provided with the day and night dual-purpose monitoring lens, the monitoring device is low in production cost, high in restoration degree of monitoring facts and strong in environmental interference resistance on the premise that the small visual field of the lens is kept, the detailed resolution capability is high, and the lens is short, short and light.
It will be evident to those skilled in the art that the invention 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 invention 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. Any reference sign in a claim should not be construed as limiting the claim concerned.
Claims (10)
1. A day and night monitoring lens sequentially comprises, from an object side to an image side along an optical axis: first lens, second lens, third lens, fourth lens, fifth lens and sixth lens, characterized in that:
the first lens has negative focal power, 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 has positive focal power, the object side surface of the second lens is a concave surface, and the image side surface of the second lens is a convex surface;
the third lens has negative 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 concave surface;
the fourth lens has positive focal power, the object side surface of the fourth lens is a convex surface, and the image side surface of the fourth lens is a convex surface;
the fifth lens has positive focal power, the object side surface of the fifth lens is a convex surface, and the image side surface of the fifth lens is a convex surface;
the sixth lens has negative focal power, the object side surface of the sixth lens is a concave surface, and the image side surface of the sixth lens is a concave surface;
wherein, the F number F # of the dual-purpose monitoring lens optical lens of day night satisfies: f # is more than or equal to 1.4 and less than or equal to 2.
2. The day and night monitoring lens according to claim 1, wherein: the stop is arranged between the second lens and the third lens, the color filter is arranged on the image surface side of the sixth lens, and the protective glass is arranged on the image surface side of the color filter.
3. The day and night monitoring lens according to claim 1, wherein: the first lens and the fourth lens are both glass spherical lenses, and the second lens, the third lens, the fifth lens and the sixth lens are all plastic aspheric lenses.
4. The day and night monitoring lens according to claim 1, wherein: the fifth lens and the sixth lens are cemented with each other to form a cemented lens set.
5. The day and night monitoring lens according to claim 1, wherein: the fifth lens and the sixth lens are separate lenses, respectively.
6. The day and night monitoring lens according to claim 1, wherein: the difference value of the Abbe numbers V1 and V2 of at least two adjacent lenses of the day and night dual-purpose monitoring lens meets the following requirements: 10 < | V1-V2| < 25, wherein V1 is the Abbe number of one of the lenses and V2 is the Abbe number of the other of the lenses.
7. The day and night monitoring lens according to claim 1, wherein: the first lens further satisfies the following condition: nd1 is more than 1.4 and less than 1.6, and Vd1 is more than 60 and less than 70; wherein, the Nd1 is the optical refractive index of the first lens, and the Vd1 is the Abbe constant of the first lens;
the second lens further satisfies the following condition: nd2 is more than 1.5 and less than 1.7, and Vd2 is more than 50 and less than 70; wherein the Nd2 is the optical refractive index of the second lens, and the Vd2 is the Abbe constant of the second lens;
the third lens further satisfies the following condition: nd3 is more than 1.5 and less than 1.7, and Vd3 is more than 50 and less than 70; wherein the Nd3 is the optical refractive index of the third lens, and the Vd3 is the Abbe constant of the third lens;
the fourth lens further satisfies the following condition: nd4 is more than 1.4 and less than 1.6, and Vd4 is more than 60 and less than 80; wherein the Nd4 is the optical refractive index of the fourth lens, and the Vd4 is the Abbe constant of the fourth lens;
the fifth lens further satisfies the following condition: nd5 is more than 1.5 and less than 1.7, and Vd5 is more than 50 and less than 70; wherein the Nd5 is the optical refractive index of the fifth lens, and the Vd5 is the Abbe constant of the fifth lens;
the sixth lens further satisfies the following condition: nd6 is more than 1.6 and less than 1.8, Vd6 is more than 20 and less than 60; wherein, the Nd6 is the optical refractive index of the sixth lens, and the Vd6 is the Abbe constant of the sixth lens.
8. The day and night monitoring lens according to claim 1, wherein: the day and night dual-purpose monitoring lens meets the conditions that:
0.12≤BFL/TTL≤0.32
the BFL is the distance from the center of the image side surface of the sixth lens of the day and night dual-purpose monitoring lens to the imaging surface of the day and night dual-purpose monitoring lens on the optical axis; TTL is a distance on the optical axis from the center of the object-side surface of the first lens element to the imaging surface of the day-night dual-purpose monitoring lens.
9. The day and night monitoring lens according to claim 1, wherein: the day and night dual-purpose monitoring lens meets the conditions that:
D/h/FOV≤0.03
the FOV is the maximum field angle of the day and night dual-purpose monitoring lens; d is the maximum clear aperture of the object-side surface of the first lens corresponding to the maximum field angle of the day and night dual-purpose monitoring lens; h is the image height corresponding to the maximum field angle of the day and night dual-purpose monitoring lens;
the day and night dual-purpose monitoring lens further meets the following requirements:
TTL/F≤4.0
(FOV×F)/h≥50
wherein, TTL is a distance from the center of the object side surface of the first lens to the imaging surface of the optical lens on the optical axis, F is a total focal length value of the monitoring lens for day and night use, FOV is a maximum viewing angle of the monitoring lens for day and night use, and h is an image height corresponding to the maximum viewing angle.
10. A monitoring device, characterized by: the day and night monitoring lens of any one of claims 1 to 9 is adopted.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010535493.4A CN111580253A (en) | 2020-06-12 | 2020-06-12 | Day and night dual-purpose monitoring lens and monitoring device |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010535493.4A CN111580253A (en) | 2020-06-12 | 2020-06-12 | Day and night dual-purpose monitoring lens and monitoring device |
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| Publication Number | Publication Date |
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| CN111580253A true CN111580253A (en) | 2020-08-25 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202010535493.4A Pending CN111580253A (en) | 2020-06-12 | 2020-06-12 | Day and night dual-purpose monitoring lens and monitoring device |
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| Country | Link |
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| CN (1) | CN111580253A (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113866937A (en) * | 2021-09-03 | 2021-12-31 | 中国电子科技集团公司第十一研究所 | Infrared dual-waveband wide-angle athermal confocal plane optical system |
| CN113885180A (en) * | 2021-11-05 | 2022-01-04 | 舜宇光学(中山)有限公司 | Glass-plastic hybrid lens |
| CN115079382A (en) * | 2022-08-19 | 2022-09-20 | 杭州德适生物科技有限公司 | Monitoring lens, camera equipment and head-mounted monitoring device |
| US12019224B2 (en) | 2023-09-21 | 2024-06-25 | Google Llc | External wide-angle lens for imagers in electronic devices |
-
2020
- 2020-06-12 CN CN202010535493.4A patent/CN111580253A/en active Pending
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113866937A (en) * | 2021-09-03 | 2021-12-31 | 中国电子科技集团公司第十一研究所 | Infrared dual-waveband wide-angle athermal confocal plane optical system |
| CN113866937B (en) * | 2021-09-03 | 2023-12-26 | 中国电子科技集团公司第十一研究所 | Infrared dual-band wide-angle athermal confocal plane optical system |
| CN113885180A (en) * | 2021-11-05 | 2022-01-04 | 舜宇光学(中山)有限公司 | Glass-plastic hybrid lens |
| CN115079382A (en) * | 2022-08-19 | 2022-09-20 | 杭州德适生物科技有限公司 | Monitoring lens, camera equipment and head-mounted monitoring device |
| US12019224B2 (en) | 2023-09-21 | 2024-06-25 | Google Llc | External wide-angle lens for imagers in electronic devices |
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