CN216956500U - Day and night confocal lens - Google Patents
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- CN216956500U CN216956500U CN202220489240.2U CN202220489240U CN216956500U CN 216956500 U CN216956500 U CN 216956500U CN 202220489240 U CN202220489240 U CN 202220489240U CN 216956500 U CN216956500 U CN 216956500U
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Abstract
The embodiment of the utility model discloses a day and night confocal lens, which comprises a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, a seventh lens and an eighth lens which are sequentially arranged from an object plane to an image plane along an optical axis; the first lens, the third lens and the seventh lens are negative focal power lenses, and the second lens, the fifth lens, the sixth lens and the eighth lens are positive focal power lenses; -0.669< Φ 1/Φ < -0.471; 0.234< Φ 2/Φ < 0.4; -0.552< Φ 3/Φ < -0.111; -0.311< Φ 4/Φ < 0.105; 0.394< Φ 5/Φ < 0.82; 0.408< Φ 6/Φ < 0.599; -1.156< Φ 7/Φ < -0.631; 0.53< Φ 8/Φ < 0.791. The day and night confocal lens provided by the utility model improves the imaging quality and meets the requirement of high-definition image quality.
Description
Technical Field
The embodiment of the utility model relates to the technical field of optical devices, in particular to a day and night confocal lens.
Background
Most day and night confocal monitoring lenses popular in the market at present have the defects of small aperture and high cost. The most that disclose in current patent are F1.6 lens of littleer diaphragm even, or big diaphragm and the longer lens of overall length, also have few F1.2 diaphragms simultaneously, and its constitution is the all glass material, has the shortcoming that the cost is higher, and there is really low cost and the confocal big clear light camera lens of day night. Therefore, there is a need to develop a large aperture, day and night confocal low-cost lens.
SUMMERY OF THE UTILITY MODEL
The embodiment of the utility model aims to provide a day and night confocal lens to improve the imaging quality and meet the requirement of high-definition image quality.
To achieve the above object, an embodiment of the present invention provides a day and night confocal lens, including: the first lens, the second lens, the third lens, the fourth lens, the fifth lens, the sixth lens, the seventh lens and the eighth lens are sequentially arranged from an object plane to an image plane along an optical axis;
the first lens, the third lens and the seventh lens are all negative focal power lenses, and the second lens, the fifth lens, the sixth lens and the eighth lens are all positive focal power lenses;
the focal power of the day and night confocal lens is phi, the focal power of the first lens is phi 1, the focal power of the second lens is phi 2, the focal power of the third lens is phi 3, the focal power of the fourth lens is phi 4, the focal power of the fifth lens is phi 5, the focal power of the sixth lens is phi 6, the focal power of the seventh lens is phi 7, and the focal power of the eighth lens is phi 8,
-0.669<Ф1/Ф<-0.471；0.234<Ф2/Ф<0.4；-0.552<Ф3/Ф<-0.111；-0.311<Ф4/Ф<0.105；0.394<Ф5/Ф<0.82；0.408<Ф6/Ф<0.599；-1.156<Ф7/Ф<-0.631，0.53<Ф8/Ф<0.791。
optionally, the first lens, the second lens, the third lens, the sixth lens, the seventh lens, and the eighth lens are all plastic aspheric lenses, and the fifth lens is a glass spherical lens.
Optionally, the surface of the lens on the side close to the object plane is an object side surface, and the surface of the lens on the side close to the image plane is an image side surface;
the object side surface of the third lens is convex towards the image plane, and the image side surface of the third lens is convex towards the image plane; the object side surface of the fifth lens is convex towards the object plane, and the image side surface of the fifth lens is convex towards the image plane; the object side surface of the sixth lens is convex towards the object plane, and the image side surface of the sixth lens is convex towards the image plane; the object side surface of the eighth lens faces the object plane in a convex mode, and the image side surface of the eighth lens faces the image plane in a convex mode.
Optionally, the refractive index of the fourth lens is n 4; the refractive index of the seventh lens is n 7;
1.53<n4<1.66；1.578<n7<1.65。
optionally, the abbe number of the first lens is v 1; the abbe number of the second lens is v 2; the third lens has an abbe number v 3; the abbe number of the fourth lens is v 4; the abbe number of the fifth lens is v 5; the abbe number of the sixth lens is v 6; the abbe number of the seventh lens is v 7; the abbe number of the eighth lens is v 8;
47<v1<61；18.5<v2<24.1；47<v3<60；24<v4<77；50<v5<97；50.4<v6<61；20.6<v7<29.8；47<v8<60。
optionally, the fourth lens and the fifth lens may be cemented.
Optionally, the F-number F of the day and night confocal lens is less than or equal to 1.2.
Optionally, the day and night confocal lens further comprises an optical filter;
the optical filter is located in a light path between the eighth lens and an imaging surface.
According to the technical scheme of the embodiment of the utility model, the quantity of the lenses in the day and night confocal lens and the relative relation of the focal power of each lens are reasonably set, so that the balance of the incident angles of the front and rear groups of lenses of the day and night confocal lens is ensured on the premise of low cost, the sensitivity of the lens is reduced, the production possibility is improved, the day and night confocal lens is ensured to have higher resolving power, the imaging quality is improved, and the requirement of high-definition image quality is met.
Drawings
Other features, objects and advantages of the utility model will become more apparent upon reading of the detailed description of non-limiting embodiments made with reference to the following drawings:
fig. 1 is a schematic structural diagram of a day-night confocal lens according to an embodiment of the present invention;
fig. 2 is a spherical aberration curve chart of a day and night confocal lens according to an embodiment of the present invention;
fig. 3 is a field curvature distortion diagram of a day and night confocal lens according to an embodiment of the present invention;
fig. 4 is a schematic structural diagram of a day-night confocal lens according to a second embodiment of the present invention;
fig. 5 is a spherical aberration curve chart of a day and night confocal lens provided in the second embodiment of the present invention;
fig. 6 is a field curvature distortion diagram of a day and night confocal lens according to a second embodiment of the present invention;
fig. 7 is a schematic structural diagram of a day-night confocal lens according to a third embodiment of the present invention;
fig. 8 is a spherical aberration curve chart of a day and night confocal lens provided in the third embodiment of the present invention;
fig. 9 is a field curvature distortion diagram of a day-night confocal lens according to a third embodiment of the present invention.
Detailed Description
To further illustrate the technical means and effects of the embodiments of the present invention for achieving the predetermined purpose of the utility model, the technical solutions of the embodiments of the present invention are clearly and completely described below with reference to the accompanying drawings and the preferred embodiments.
Next, the present invention is described in detail with reference to the schematic drawings, and in the detailed description of the embodiments of the present invention, the schematic drawings showing the structure of the device are not partially enlarged in general scale for convenience of description, and the schematic drawings are only examples, which should not limit the scope of the present invention. In addition, the three-dimensional dimensions of length, width and height should be included in the actual fabrication.
Example one
Fig. 1 is a schematic structural diagram of a day-night confocal lens according to an embodiment of the present invention, as shown in fig. 1, the day-night confocal lens includes: a first lens 101, a second lens 102, a third lens 103, a fourth lens 104, a fifth lens 105, a sixth lens 106, a seventh lens 107, and an eighth lens 108 arranged in this order from an object plane to an image plane along an optical axis; the first lens 101, the third lens 103 and the seventh lens 107 are all negative-power lenses, and the second lens 102, the fifth lens 105, the sixth lens 106 and the eighth lens 108 are all positive-power lenses; the focal power of the day and night confocal lens is phi, the focal power of the first lens 101 is phi 1, the focal power of the second lens 102 is phi 2, the focal power of the third lens 103 is phi 3, the focal power of the fourth lens 104 is phi 4, the focal power of the fifth lens 105 is phi 5, the focal power of the sixth lens 106 is phi 6, the focal power of the seventh lens 107 is phi 7, and the focal power of the eighth lens 108 is phi 8, -0.669< phi 1/phi < -0.471; 0.234< Φ 2/Φ < 0.4; -0.552< Φ 3/Φ < -0.111; -0.311< Φ 4/Φ < 0.105; 0.394< Φ 5/Φ < 0.82; 0.408< Φ 6/Φ < 0.599; -1.156< Φ 7/Φ < -0.631; 0.53< Φ 8/Φ < 0.791.
Illustratively, the optical power is equal to the difference between the image-side and object-side beam convergence, which characterizes the ability of the optical system to deflect light. The larger the absolute value of the focal power is, the stronger the bending ability to the light ray is, and the smaller the absolute value of the focal power is, the weaker the bending ability to the light ray is. When the focal power is positive, the refraction of the light is convergent; when the focal power is negative, the refraction of the light is divergent. The optical power may be suitable for characterizing a certain refractive surface of a lens (i.e. a surface of the lens), may be suitable for characterizing a certain lens, and may also be suitable for characterizing a system (i.e. a lens group) formed by a plurality of lenses together. In the day and night confocal lens provided in this embodiment, each lens may be fixed in one lens barrel (not shown in fig. 1), the first lens 101 is set to be a negative focal length lens, the light incident angle of the optical system is controlled, the third lens 103 and the seventh lens 107 are negative power lenses, and the second lens 102, the fifth lens 105, the sixth lens 106 and the eighth lens 108 are positive power lenses; the sixth lens 106, the seventh lens 107 and the eighth lens 108 are used for correcting off-axis aberrations including field curvature, coma, astigmatism and the like. The whole lens ensures that the focal power of the optical system is distributed according to a certain proportion, and the balance of the incident angles of the front and rear lens groups is ensured, so that the sensitivity of the lens is reduced, and the production possibility is improved.
Further, the focal power of the day and night confocal lens is phi, the focal power of the first lens 101 is phi 1, the focal power of the second lens 102 is phi 2, the focal power of the third lens 103 is phi 3, the focal power of the fourth lens 104 is phi 4, the focal power of the fifth lens 105 is phi 5, the focal power of the sixth lens 106 is phi 6, the focal power of the seventh lens 107 is phi 7, and the focal power of the eighth lens 108 is phi 8, -0.669< phi 1/phi < -0.471; 0.234< Φ 2/Φ < 0.4; -0.552< Φ 3/Φ < -0.111; -0.311< Φ 4/Φ < 0.105; 0.394< Φ 5/Φ < 0.82; 0.408< Φ 6/Φ < 0.599; -1.156< Φ 7/Φ < -0.631; 0.53< Φ 8/Φ < 0.791. The optical power of the fourth lens 104 may be positive or negative. The focal power of each lens is reasonably distributed, the deflection capability of each lens to light rays is ensured, the sensitivity of the lens is further reduced, and the production possibility is improved.
In summary, by reasonably setting the number of the lenses in the day and night confocal lens and the relative relationship between the focal powers of the lenses, the day and night confocal lens is ensured to clearly image in a high-low temperature environment and at night on the premise of smaller f-number.
As a possible implementation manner, the first lens 101, the second lens 102, the third lens 103, the fourth lens 104, the sixth lens 106, the seventh lens 107, and the eighth lens 108 are all plastic aspheric lenses, and the fifth lens 105 is a glass spherical lens.
As a possible implementation manner, the first lens 101, the second lens 102, the third lens 103, the sixth lens 106, the seventh lens 107 and the eighth lens 108 are all plastic aspheric lenses, and the fourth lens 104 and the fifth lens 105 are glass spherical lenses.
The plastic aspheric lens may be made of various plastics known to those skilled in the art, and the glass spherical lens may be made of various types of glass known to those skilled in the art, which are not described or limited in the embodiments of the present invention. Because the cost of the plastic lens is far lower than that of the glass lens, the day and night confocal lens provided by the embodiment of the utility model adopts a mode of mixing and matching the glass lens and the plastic lens, so that the cost of the day and night confocal lens can be effectively controlled while the optical performance of the day and night confocal lens is ensured.
As a possible implementation manner, a surface of each lens on a side of the lens adjacent to the object plane is defined as an object side surface, and a surface of each lens on a side of the lens adjacent to the image plane is defined as an image side surface, wherein the object side surface of the third lens 103 is convex towards the image plane, and the image side surface of the third lens 103 is convex towards the image plane; the object side surface of the fifth lens 105 is convex toward the object plane, and the image side surface of the fifth lens 105 is convex toward the image plane; the object side surface of the sixth lens 106 is convex toward the object plane, and the image side surface of the sixth lens 106 is convex toward the image plane; the object side surface of the eighth lens 108 is convex toward the object plane, and the image side surface of the eighth lens 108 is convex toward the image plane.
Exemplarily, as shown in fig. 1, by reasonably setting the surface type of each lens, the focal power of each lens can meet the focal power requirement in the above embodiment, and at the same time, the whole fixed-focus lens can also be ensured to have a compact structure and a high integration level.
Optionally, the refractive index of the fourth lens is n 4; the refractive index of the seventh lens is n 7; 1.53< n4< 1.66; 1.578< n7< 1.65.
Optionally, the abbe number of the first lens 101 is v 1; the abbe number of the second lens 102 is v 2; the abbe number of the third lens 103 is v 3; the abbe number of the fourth lens 104 is v 4; the abbe number of the fifth lens 105 is v 5; the abbe number of the sixth lens 106 is v 6; the abbe number of the seventh lens 107 is v 7; the abbe number of the eighth lens 108 is v 8;
47<v1<61；18.5<v2<24.1；47<v3<60；24<v4<77；50<v5<97；50.4<v6<61；20.6<v7<29.8；47<v8<60。
the refractive index is the ratio of the propagation speed of light in vacuum to the propagation speed of light in the medium, and is mainly used for describing the refractive power of materials to light, and the refractive indexes of different materials are different. The abbe number is an index for expressing the dispersion capability of the transparent medium, and the more severe the dispersion of the medium is, the smaller the abbe number is; conversely, the more slight the dispersion of the medium, the greater the abbe number. Therefore, the refractive index and the abbe number of each lens in the day and night confocal lens are matched, the balance of the incident angles of the front and rear lens groups is ensured, the sensitivity of the lens is reduced, and the production possibility is improved.
Alternatively, the fourth lens 104 and the fifth lens 10 may be cemented.
The image side surface of the fourth lens element 104 and the object side surface of the fifth lens element 105 can be supported by the spacer ring and can also be glued and fixed by glue, so that a glued structure is formed, the aberration correction function is good, the optical performance of the system is improved, and the tolerance is improved. In addition, the cemented lens can be used for reducing chromatic aberration or eliminating chromatic aberration to the maximum extent, so that various aberrations of the fixed-focus lens can be fully corrected, the resolution can be improved, and optical performances such as CRA (crazing-first-order optical interference) and the like can be optimized on the premise of compact structure; and the light quantity loss caused by reflection between the lenses can be reduced, and the illumination is improved, so that the image quality is improved, and the imaging definition of the lens is improved. In addition, the use of the cemented lens can also reduce the assembly parts between the two lenses, simplify the assembly procedure in the lens manufacturing process, reduce the cost, and reduce the tolerance sensitivity problems of the lens unit, such as inclination/decentration, and the like, generated in the assembly process.
Optionally, F number F of the day and night confocal lens satisfies that F is less than or equal to 1.2.
Wherein, the setting of the light ring of day night confocal camera lens can satisfy great light volume of passing through to satisfy the control demand under the low-light level shimmer condition.
Optionally, the day and night confocal lens further includes an optical filter 100;
the filter 100 is located in an optical path between the eighth lens 108 and an imaging surface.
The type of the optical filter 100 is reasonably set, stray light is filtered, and required specific light is selected for imaging, so that the imaging quality is ensured.
For example, as shown in fig. 1, by reasonably setting the surface type of each lens, it is ensured that the focal power and the focal length of each lens meet the focal power and the focal length requirements in the above embodiments, and at the same time, it is also ensured that the whole day and night confocal lens has a compact structure and a high integration level.
As an example, table 1 details specific setting parameters of each lens in the day-night confocal lens provided in the first embodiment of the present invention in a possible implementation manner.
TABLE 1 design values of optical parameters of day and night confocal lens
| Number of noodles | Surface type | Radius of curvature | Thickness of | Nd | Vd | Semi-Diameter |
| OBJ | Spherical surface | infinity | infinity | |||
| 1 | Aspherical surface | -27.5447 | 0.947 | 1.535 | 57.565 | |
| 2 | Aspherical surface | 4.7871 | 1.944 | |||
| 3 | Aspherical surface | -18.9562 | 1.566 | 1.64 | 23.19 | 2.65 |
| 4 | Aspherical surface | -5.4673 | 0.356 | 2.65 | ||
| 5 | Aspherical surface | -2.7235 | 1.000 | 1.535 | 56.35 | 2.65 |
| 6 | Aspherical surface | -9.0401 | 0.100 | 2.65 | ||
| 7 | Aspherical surface | -338.0362 | 1.654 | 1.64 | 33.26 | |
| 8 | Aspherical surface | -45.8473 | 0.100 | |||
| 9 | Spherical surface | 10.2493 | 2.240 | 1.497 | 88.33 | |
| 10 | Spherical surface | -6.3665 | 0.100 | |||
| STO | Aspherical surface | 7.1103 | 1.778 | 1.535 | 56.07 | 2.85 |
| 12 | Aspherical surface | -6.3899 | 0.364 | |||
| 13 | Aspherical surface | -2.1930 | 1.266 | 1.588 | 28.44 | |
| 14 | Aspherical surface | 40.8096 | 0.100 | |||
| 15 | Aspherical surface | 4.5835 | 3.340 | 1.535 | 54.88 | 3.05 |
| 16 | Aspherical surface | -4.7894 | 1.300 | 3.05 | ||
| 17 | Spherical surface | infinity | 0.700 | 1.52 | 64.2 | |
| 18 | Spherical surface | infinity | 3.503 |
With continued reference to fig. 1, the day and night confocal lens provided by the embodiment of the present invention includes a first lens 101, a second lens 102, a third lens 103, a fourth lens 104, a fifth lens 105, a sixth lens 106, a seventh lens 107, and an eighth lens 108, which are arranged in order from an object plane to an image plane along an optical axis. Table 1 shows optical physical parameters such as curvature radius, thickness, and material of each lens in the day and night confocal lens provided in the embodiment. Wherein, the surface numbers are numbered according to the surface sequence of the lenses, for example, "1" represents the object surface of the first lens 101, "2" represents the image surface of the first lens 101, "9" represents the object surface of the fifth lens 105, "10" represents the image surface of the fifth lens 105, and so on; the curvature radius represents the bending degree of the surface of the lens, a positive value represents that the surface is bent to the image surface side, and a negative value represents that the surface is bent to the object surface side; thickness represents the central axial distance from the current surface to the next surface, and the radius of curvature and thickness are both in millimeters (mm).
In addition to the above embodiment, optionally, the first lens 101, the second lens 102, the third lens 103, the fourth lens 104, the sixth lens 106, the seventh lens 107 and the eighth lens 108 are all plastic aspheric lenses, and the fifth lens 105 is a glass spherical lens. The day and night confocal lens provided by the embodiment of the utility model further comprises a diaphragm (STO), and the propagation direction of the light beam can be adjusted by additionally arranging the diaphragm, so that the imaging quality is favorably improved. A stop may be located in the optical path between the fifth lens 105 and the sixth lens 106, but the specific location of the stop is not limited in the embodiments of the present invention, and by locating the stop at a suitable location, it is helpful to improve the relative illuminance and reduce the CRA.
The aspherical surface shape equation Z of the first lens 101, the second lens 102, the third lens 103, the fourth lens 104, the sixth lens 106, the seventh lens 107, and the eighth lens 108 satisfies:
wherein Z is the distance rise from the vertex of the aspheric surface when the aspheric surface is at the position with the height of y along the optical axis direction; c is 1/R, R represents the paraxial radius of curvature of the mirror surface; k is a conic coefficient; A. b, C, D, E, F is a high-order aspheric coefficient, wherein Z, R and y are both in mm.
Illustratively, table 2 details the aspheric coefficients of the lenses of the present embodiment in one possible implementation.
TABLE 2 aspherical coefficients in day and night confocal lens
Wherein 8.555204E-04 indicates that the coefficient A with the surface number of 1 is 8.555204 x 10-4。
The day and night confocal lens of the first embodiment achieves the following technical indexes:
f number: f ═ 1.2.
Further, fig. 2 is a spherical aberration curve diagram of the day and night confocal lens according to the first embodiment of the present invention, as shown in fig. 2, spherical aberrations of the day and night confocal lens at different wavelengths (0.436 μm, 0.486 μm, 0.546 μm, 0.588 μm, 0.656 μm and 0.850 μm) are all within 0.05mm, and different wavelength curves are relatively concentrated, which indicates that an axial aberration of the day and night confocal lens is small, so that it can be known that the day and night confocal lens according to the first embodiment of the present invention can better correct the spherical aberration.
Fig. 3 is a field curvature distortion diagram of a day and night confocal lens according to an embodiment of the present invention, as shown in fig. 3, in a left-side coordinate system, a horizontal coordinate represents a size of the field curvature, and the unit is mm; the vertical coordinate represents the normalized image height, with no units; wherein T represents meridian and S represents sagittal; as can be seen from fig. 3, the day and night confocal lens provided by the first embodiment is effectively controlled in field curvature from light with a wavelength of 436nm to light with a wavelength of 850nm, that is, when imaging, the difference between the image quality at the center and the image quality at the periphery is small; in the right-hand coordinate system, the horizontal coordinate represents the magnitude of distortion in units; the vertical coordinate represents the normalized image height, with no units; as can be seen from fig. 3, the distortion of the day and night confocal lens provided by the embodiment of the utility model is better corrected.
Example two
Fig. 4 is a schematic structural diagram of a day-night confocal lens according to a second embodiment of the present invention, as shown in fig. 4, the day-night confocal lens includes: a first lens 201, a second lens 202, a third lens 203, a fourth lens 204, a fifth lens 205, a sixth lens 206, a seventh lens 207, and an eighth lens 208 arranged in this order from an object plane to an image plane along an optical axis; the first lens 201, the third lens 203 and the seventh lens 207 are all negative-power lenses, and the second lens 202, the fifth lens 205, the sixth lens 206 and the eighth lens 208 are all positive-power lenses; the focal power of the day and night confocal lens is phi, the focal power of the first lens 201 is phi 1, the focal power of the second lens 202 is phi 2, the focal power of the third lens 203 is phi 3, the focal power of the fourth lens 204 is phi 4, the focal power of the fifth lens 205 is phi 5, the focal power of the sixth lens 206 is phi 6, the focal power of the seventh lens 207 is phi 7, and the focal power of the eighth lens 208 is phi 8, -0.669< phi 1/phi < -0.471; 0.234< Φ 2/Φ < 0.4; -0.552< Φ 3/Φ < -0.111; -0.311< Φ 4/Φ < 0.105; 0.394< Φ 5/Φ < 0.82; 0.408< Φ 6/Φ < 0.599; -1.156< Φ 7/Φ < -0.631; 0.53< Φ 8/Φ < 0.791.
Through the reasonable relative relation between the lens quantity in the day and night confocal camera lens and the focal power of each lens, guarantee that the day and night confocal camera lens uses the resolving power to satisfy the formation of image requirement under high low temperature environment under the prerequisite of less f-number, guarantee the formation of image ability of camera lens under the night environment.
As a possible implementation manner, the first lens 201, the second lens 202, the third lens 203, the sixth lens 206, the seventh lens 207 and the eighth lens 208 are all plastic aspheric lenses, and the fourth lens 204 and the fifth lens 205 are glass spherical lenses. The plastic aspheric lens may be made of various plastics known to those skilled in the art, and the glass spherical lens may be made of various types of glass known to those skilled in the art, which are neither described nor limited in the embodiments of the present invention. Because the cost of the plastic lens is far lower than that of the glass lens, the day and night confocal lens provided by the embodiment of the utility model adopts a mode of mixing and matching the glass lens and the plastic lens, so that the cost of the day and night confocal lens can be effectively controlled while the optical performance of the day and night confocal lens is ensured.
The power, refractive index and abbe number of each lens are the same as those in the first embodiment, and are not described herein again.
Table 3 illustrates specific setting parameters of each lens in the day-night confocal lens provided in example two of the present invention in a feasible implementation manner.
TABLE 3 design values of optical parameters of day and night confocal lens
| Number of noodles | Surface type | Radius of curvature | Thickness of | Nd | Vd | Semi-Diameter |
| OBJ | Spherical surface | infinity | infinity | |||
| 1 | Aspherical surface | 13.1653 | 1.588 | 1.53 | 47.79 | |
| 2 | Aspherical surface | 2.6080 | 2.273 | |||
| 3 | Aspherical surface | 100.0000 | 1.279 | 1.66 | 19.68 | 2.8 |
| 4 | Aspherical surface | -7.8546 | 0.626 | 2.8 | ||
| 5 | Aspherical surface | -2.2268 | 1.213 | 1.54 | 58 | 2.8 |
| 6 | Aspherical surface | -3.4986 | 0.100 | 2.8 | ||
| 7 | Spherical surface | 7.2424 | 0.802 | 1.555 | 30.46 | |
| 8 | Spherical surface | 3.8859 | 2.668 | 1.495 | 54.52 | |
| 9 | Spherical surface | -6.8535 | 0.100 | |||
| STO | Aspherical surface | 25.6151 | 1.562 | 1.54 | 52 | 2.73 |
| 11 | Aspherical surface | -5.0428 | 0.378 | |||
| 12 | Aspherical surface | -2.4446 | 1.457 | 1.64 | 21.89 | |
| 13 | Aspherical surface | -14.0001 | 0.100 | |||
| 14 | Aspherical surface | 8.6937 | 2.630 | 1.54 | 59 | 3.2 |
| 15 | Aspherical surface | -5.2815 | 1.300 | 3.2 | ||
| 16 | Spherical surface | infinity | 0.700 | 1.52 | 64.2 | |
| 17 | Spherical surface | infinity | 3.529 |
With continued reference to fig. 4, the day and night confocal lens provided by the embodiment of the present invention includes a first lens 201, a second lens 202, a third lens 203, a fourth lens 204, a fifth lens 205, a sixth lens 206, a seventh lens 207, and an eighth lens 208, which are arranged in order from an object plane to an image plane along an optical axis. Table 3 shows optical physical parameters such as the radius of curvature, thickness, and material of each lens in the day and night confocal lens provided in the embodiment. Wherein, the surface numbers are numbered according to the surface sequence of the lenses, for example, "1" represents the object surface of the first lens 201, "2" represents the image surface of the first lens 201, "8" represents the object surface of the fifth lens 205, "9" represents the image surface of the fifth lens 205, and so on; the curvature radius represents the bending degree of the surface of the lens, a positive value represents that the surface is bent to the image surface side, and a negative value represents that the surface is bent to the object surface side; thickness represents the central axial distance from the current surface to the next surface, and the radius of curvature and thickness are both in millimeters (mm).
Based on the above implementation, optionally, the first lens 201, the second lens 202, the third lens 203, the sixth lens 206, the seventh lens 207, and the eighth lens 208 are all plastic aspheric lenses, and the fourth lens 204 and the fifth lens 205 are glass spherical lenses. The day and night confocal lens provided by the embodiment of the utility model further comprises a diaphragm (STO), and the propagation direction of the light beam can be adjusted by additionally arranging the diaphragm, so that the imaging quality is favorably improved. The stop may be located in the optical path between the fifth lens 205 and the sixth lens 206, but the specific location of the stop is not limited by the embodiment of the present invention, and by locating the stop at a suitable location, it is helpful to improve the relative illuminance and reduce the CRA.
The aspherical surface shape equation Z of the first lens 201, the second lens 202, the third lens 203, the sixth lens 206, the seventh lens 207, and the eighth lens 208 satisfies:
wherein Z is the distance rise from the vertex of the aspheric surface when the aspheric surface is at the position with the height of y along the optical axis direction; c is 1/R, R represents the paraxial radius of curvature of the mirror surface; k is a conic coefficient; A. b, C, D, E, F is a high-order aspheric coefficient, where Z, R and y are both in mm.
Illustratively, table 4 details the aspheric coefficients of the lenses of the present embodiment in one possible implementation.
TABLE 4 aspheric coefficients in day and night confocal lens
wherein-5.450633E-03 indicates that the coefficient A with the face number of 1 is-5.450633 x 10-3。
The day and night confocal lens of the second embodiment achieves the following technical indexes:
f number: f ═ 1.2.
Further, fig. 5 is a spherical aberration curve diagram of the day and night confocal lens provided by the second embodiment of the present invention, as shown in fig. 5, the spherical aberration of the day and night confocal lens at different wavelengths (0.436 μm, 0.486 μm, 0.546 μm, 0.588 μm, 0.656 μm and 0.850 μm) is within 0.05mm, and different wavelength curves are relatively concentrated, which indicates that the axial aberration of the day and night confocal lens is small, so that it can be known that the day and night confocal lens provided by the second embodiment of the present invention can better correct the spherical aberration.
Fig. 6 is a field curvature distortion diagram of a day and night confocal lens according to a second embodiment of the present invention, as shown in fig. 6, in a left coordinate system, a horizontal coordinate represents a size of the field curvature, and the unit is mm; the vertical coordinate represents the normalized image height, with no units; wherein T represents meridian and S represents sagittal; as can be seen from fig. 6, the day and night confocal lens provided in the second embodiment is effectively controlled in field curvature from light with a wavelength of 436nm to light with a wavelength of 850nm, that is, when imaging, the difference between the image quality at the center and the image quality at the periphery is small; in the right-hand coordinate system, the horizontal coordinate represents the magnitude of distortion in units; the vertical coordinate represents the normalized image height, with no units; as can be seen from fig. 6, the distortion of the day and night confocal lens provided by the second embodiment of the present invention is better corrected.
EXAMPLE III
Fig. 7 is a schematic structural diagram of a day-night confocal lens according to a third embodiment of the present invention, as shown in fig. 7, the day-night confocal lens includes: a first lens 301, a second lens 302, a third lens 303, a fourth lens 304, a fifth lens 305, a sixth lens 306, a seventh lens 307, and an eighth lens 308 arranged in this order from the object plane to the image plane along the optical axis; the first lens 301, the third lens 303 and the seventh lens 307 are all negative-power lenses, and the second lens 302, the fifth lens 305, the sixth lens 306 and the eighth lens 308 are all positive-power lenses; the focal power of the day and night confocal lens is phi, the focal power of the first lens 301 is phi 1, the focal power of the second lens 302 is phi 2, the focal power of the third lens 303 is phi 3, the focal power of the fourth lens 304 is phi 4, the focal power of the fifth lens 305 is phi 5, the focal power of the sixth lens 306 is phi 6, the focal power of the seventh lens 307 is phi 7, and the focal power of the eighth lens 308 is phi 8, -0.669< phi 1/phi < -0.471; 0.234< Φ 2/Φ < 0.4; -0.552< Φ 3/Φ < -0.111; -0.311< Φ 4/Φ < 0.105; 0.394< Φ 5/Φ < 0.82; 0.408< Φ 6/Φ < 0.599; -1.156< Φ 7/Φ < -0.631; 0.53< Φ 8/Φ < 0.791.
Through the reasonable relative relation between the lens quantity in the day and night confocal camera lens and the focal power of each lens, guarantee that the day and night confocal camera lens uses the resolving power to satisfy the formation of image requirement under high low temperature environment under the prerequisite of less f-number, guarantee the formation of image ability of camera lens under the night environment.
As a possible implementation, the first lens 301, the second lens 302, the third lens 303, the sixth lens 306, the seventh lens 307 and the eighth lens 308 are all plastic aspheric lenses, and the fourth lens 304 and the fifth lens 305 are glass spherical lenses. The plastic aspheric lens may be made of various plastics known to those skilled in the art, and the glass spherical lens may be made of various types of glass known to those skilled in the art, which are neither described nor limited in the embodiments of the present invention. Because the cost of the plastic lens is far lower than that of the glass lens, the day and night confocal lens provided by the embodiment of the utility model adopts a mode of mixing and matching the glass lens and the plastic lens, so that the cost of the day and night confocal lens can be effectively controlled while the optical performance of the day and night confocal lens is ensured.
The power, refractive index and abbe number of each lens are the same as those in the first embodiment, and are not described herein again.
Illustratively, table 5 details specific setting parameters of each lens in the day-night confocal lens provided in the third embodiment of the present invention in a possible implementation manner.
TABLE 5 design values of optical parameters of day and night confocal lens
| Number of noodles | Surface type | Radius of curvature | Thickness of | Nd | Vd | Semi-Diameter |
| OBJ | Spherical surface | infinity | infinity | |||
| 1 | Aspherical surface | 22.1180 | 1.377 | 1.535 | 60 | |
| 2 | Aspherical surface | 2.6489 | 2.662 | |||
| 3 | Aspherical surface | 100.0000 | 1.336 | 1.654 | 19 | 2.7 |
| 4 | Aspherical surface | -10.1835 | 0.686 | 2.7 | ||
| 5 | Aspherical surface | -2.3428 | 1.121 | 1.542 | 47 | 2.7 |
| 6 | Aspherical surface | -3.4512 | 0.100 | 2.7 | ||
| 7 | Spherical surface | 7.0547 | 0.802 | 1.55 | 70 | |
| 8 | Spherical surface | 4.0351 | 2.496 | 1.496 | 96 | |
| 9 | Spherical surface | -7.0268 | 0.100 | |||
| STO | Aspherical surface | 24.9535 | 1.763 | 1.537 | 60.18 | 2.8 |
| 11 | Aspherical surface | -5.3184 | 0.359 | |||
| 12 | Aspherical surface | -2.5209 | 1.480 | 1.636 | 22.3 | |
| 13 | Aspherical surface | -13.2130 | 0.100 | |||
| 14 | Aspherical surface | 8.6485 | 2.386 | 1.539 | 47 | 3.2 |
| 15 | Aspherical surface | -5.1902 | 1.300 | 3.2 | ||
| 16 | Spherical surface | infinity | 0.700 | 1.52 | 64.2 | |
| 17 | Spherical surface | infinity | 3.525 |
With continued reference to fig. 5, the day and night confocal lens provided by the embodiment of the present invention includes a first lens 301, a second lens 302, a third lens 303, a fourth lens 304, a fifth lens 305, a sixth lens 306, a seventh lens 307, and an eighth lens 308, which are arranged in order from an object plane to an image plane along an optical axis. Table 3 shows optical physical parameters such as the radius of curvature, thickness, and material of each lens in the day and night confocal lens provided in the embodiment. Wherein, the surface numbers are numbered according to the surface sequence of the respective lenses, for example, "1" represents the object surface of the first lens 301, "2" represents the image surface of the first lens 301, "8" represents the object surface of the fifth lens 305, "9" represents the image surface of the fifth lens 305, and so on; the curvature radius represents the bending degree of the surface of the lens, a positive value represents that the surface is bent to the image surface side, and a negative value represents that the surface is bent to the object surface side; thickness represents the central axial distance from the current surface to the next surface, and the radius of curvature and thickness are both in millimeters (mm).
Based on the above implementation, optionally, the first lens 301, the second lens 302, the third lens 303, the sixth lens 306, the seventh lens 307, and the eighth lens 308 are all plastic aspheric lenses, and the fourth lens 304 and the fifth lens 305 are glass spherical lenses. The day and night confocal lens provided by the embodiment of the utility model also comprises a diaphragm (STO), and the propagation direction of the light beam can be adjusted by additionally arranging the diaphragm, so that the imaging quality is favorably improved. A stop may be located in the optical path between the fifth lens 305 and the sixth lens 306, but the specific location of the stop is not limited in the embodiments of the present invention, and by locating the stop at a suitable location, it is helpful to improve the relative illuminance and reduce the CRA.
The aspherical surface shape equation Z of the first lens 301, the second lens 302, the third lens 303, the sixth lens 306, the seventh lens 307, and the eighth lens 308 satisfies:
wherein Z is the distance rise from the vertex of the aspheric surface when the aspheric surface is at the position with the height of y along the optical axis direction; c is 1/R, R represents the paraxial radius of curvature of the mirror surface; k is a conic coefficient; A. b, C, D, E, F is a high-order aspheric coefficient, where Z, R and y are both in mm.
Illustratively, table 6 details the aspheric coefficients of the lenses of the present embodiment in one possible implementation.
TABLE 6 aspherical coefficients in day and night confocal lens
wherein-5.127112E-03 indicates that the coefficient A with the face number of 1 is-5.127112 x 10-3。
The day and night confocal lens of the third embodiment achieves the following technical indexes:
f number: f ═ 1.2.
Further, fig. 8 is a spherical aberration curve diagram of a day and night confocal lens provided by a third embodiment of the present invention, as shown in fig. 8, spherical aberrations of the day and night confocal lens at different wavelengths (0.436 μm, 0.486 μm, 0.546 μm, 0.588 μm, 0.656 μm and 0.850 μm) are all within 0.05mm, and different wavelength curves are relatively concentrated, which indicates that an axial aberration of the day and night confocal lens is small, so that it can be known that the day and night confocal lens provided by the third embodiment of the present invention can better correct the spherical aberration.
Fig. 9 is a field curvature distortion diagram of a day-night confocal lens according to a third embodiment of the present invention, as shown in fig. 9, in a left-side coordinate system, a horizontal coordinate represents a size of the field curvature, and the unit is mm; the vertical coordinate represents the normalized image height, with no units; wherein T represents meridian and S represents sagittal; as can be seen from fig. 9, the day and night confocal lens provided by the third embodiment is effectively controlled in curvature of field from light with a wavelength of 436nm to light with a wavelength of 850nm, that is, when imaging, the difference between the image quality at the center and the image quality at the periphery is small; in the right-hand coordinate system, the horizontal coordinate represents the magnitude of distortion in units; the vertical coordinate represents the normalized image height, with no units; as can be seen from fig. 9, the distortion of the day and night confocal lens provided by the third embodiment of the present invention is better corrected.
Table 7 summarizes the parameters of the above examples, and details of the refractive power, refractive index, and abbe number of each lens in the above examples are shown in table 7.
TABLE 7 summary of parameters of the above examples
| Example one | Example two | EXAMPLE III | Scope of protection | |
| Ф1/Ф | -0.500 | -0.640 | -0.624 | -0.669～-0.471 |
| Ф2/Ф | 0.330 | 0.377 | 0.258 | 0.234～0.4 |
| Ф3/Ф | -0.489 | -0.243 | -0.174 | -0.552～-0.111 |
| Ф4/Ф | 0.046 | -0.252 | -0.192 | -0.311～0.105 |
| Ф5/Ф | 0.455 | 0.759 | 0.649 | 0.394～0.82 |
| Ф6/Ф | 0.572 | 0.522 | 0.436 | 0.408～0.599 |
| Ф7/Ф | -1.081 | -0.857 | -0.706 | -1.156～-0.631 |
| Ф8/Ф | 0.754 | 0.636 | 0.567 | 0.53～0.791 |
| n4 | 1.64 | 1.555 | 1.55 | 1.53～1.66 |
| n7 | 1.588 | 1.64 | 1.636 | 1.578～1.65 |
| v1 | 57.565 | 47.79 | 60 | 47～61 |
| v2 | 23.19 | 19.68 | 19 | 18.5～24.1 |
| v3 | 56.35 | 58 | 47 | 47～60 |
| v4 | 33.26 | 30.46 | 70 | 24～77 |
| v5 | 88.33 | 54.52 | 96 | 50～97 |
| v6 | 56.07 | 52 | 60.18 | 50.4～61 |
| v7 | 28.44 | 21.89 | 22.3 | 20.6～29.8 |
| v8 | 54.88 | 59 | 47 | 47～60 |
It is to be noted that the foregoing is only illustrative of the preferred embodiments of the present invention and the technical principles employed. It will be understood by those skilled in the art that the present invention is not limited to the particular embodiments described herein, but is capable of various obvious modifications, rearrangements, combinations and substitutions as will now become apparent to those skilled in the art without departing from the scope of the utility model. Therefore, although the present invention has been described in greater detail by the above embodiments, the present invention is not limited to the above embodiments, and may include other equivalent embodiments without departing from the spirit of the present invention, and the scope of the present invention is determined by the scope of the appended claims.
Claims (8)
1. A day-night confocal lens, comprising: the first lens, the second lens, the third lens, the fourth lens, the fifth lens, the sixth lens, the seventh lens and the eighth lens are sequentially arranged from an object plane to an image plane along an optical axis;
the first lens, the third lens and the seventh lens are all negative focal power lenses, and the second lens, the fifth lens, the sixth lens and the eighth lens are all positive focal power lenses;
the focal power of the day and night confocal lens is phi, the focal power of the first lens is phi 1, the focal power of the second lens is phi 2, the focal power of the third lens is phi 3, the focal power of the fourth lens is phi 4, the focal power of the fifth lens is phi 5, the focal power of the sixth lens is phi 6, the focal power of the seventh lens is phi 7, and the focal power of the eighth lens is phi 8,
-0.669<Ф1/Ф<-0.471；0.234<Ф2/Ф<0.4；-0.552<Ф3/Ф<-0.111；-0.311<Ф4/Ф<0.105；0.394<Ф5/Ф<0.82；0.408<Ф6/Ф<0.599；-1.156<Ф7/Ф<-0.631；0.53<Ф8/Ф<0.791。
2. the day-night confocal lens according to claim 1, wherein the first lens, the second lens, the third lens, the sixth lens, the seventh lens and the eighth lens are all plastic aspheric lenses, and the fifth lens is a glass spherical lens.
3. The day-night confocal lens according to claim 1, wherein a surface of the lens on a side adjacent to the object plane is an object-side surface, and a surface of the lens on a side adjacent to the image plane is an image-side surface;
the object side surface of the third lens is convex towards the image plane, and the image side surface of the third lens is convex towards the image plane; the object side surface of the fifth lens is convex towards the object plane, and the image side surface of the fifth lens is convex towards the image plane; the object side surface of the sixth lens is convex towards the object plane, and the image side surface of the sixth lens is convex towards the image plane; the object side surface of the eighth lens faces the object plane in a convex mode, and the image side surface of the eighth lens faces the image plane in a convex mode.
4. The day-night confocal lens according to claim 1, wherein the refractive index of the fourth lens is n 4; the refractive index of the seventh lens is n 7;
1.53<n4<1.66；1.578<n7<1.65。
5. the day-night confocal lens according to claim 1, wherein the abbe number of the first lens is v 1; the abbe number of the second lens is v 2; the third lens has an abbe number v 3; the abbe number of the fourth lens is v 4; the abbe number of the fifth lens is v 5; the abbe number of the sixth lens is v 6; the abbe number of the seventh lens is v 7; the abbe number of the eighth lens is v 8;
47<v1<61；18.5<v2<24.1；47<v3<60；24<v4<77；50<v5<97；50.4<v6<61；20.6<v7<29.8；47<v8<60。
6. the day-night confocal lens according to claim 1, wherein the fourth lens and the fifth lens are cemented.
7. The day-night confocal lens according to claim 1, wherein an F-number F of the day-night confocal lens satisfies F ≦ 1.2.
8. The day-night confocal lens according to claim 1, further comprising an optical filter;
the optical filter is positioned in a light path between the eighth lens and an imaging surface.
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