CN217385962U - Glass-plastic mixed optical system - Google Patents
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- CN217385962U CN217385962U CN202221048099.9U CN202221048099U CN217385962U CN 217385962 U CN217385962 U CN 217385962U CN 202221048099 U CN202221048099 U CN 202221048099U CN 217385962 U CN217385962 U CN 217385962U
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Abstract
The utility model relates to a mixed optical system is moulded to glass, include: the optical lens system comprises a first lens, a second lens, a third lens, a fourth lens, a fifth lens and a sixth lens, wherein the first lens, the second lens, the third lens, the fourth lens, the fifth lens and the sixth lens are sequentially arranged along an optical axis from an object side to an image side, the third lens is an aspheric lens, the second lens and the third lens have positive focal power or negative focal power, the third lens is a paraxial region convex-concave lens, the fifth lens is a paraxial region concave-concave lens, and the whole group focal length F of the optical system and the total optical length TTL of the optical system meet the following requirements: TTL/F is more than or equal to 6.7 and less than or equal to 7.0. The utility model discloses a mixed optical system is moulded to glass is small, with low costs, can realize maximum light ring FNO1.6, and the power of resolving an image can reach eight million pixels, and the formation of image target surface can reach 1/2.7 ", realizes that the object space angle of vision is greater than 125 image capture, and visible light and infrared light are confocal, do not focus in-40 ℃ -80 ℃ temperature range.
Description
Technical Field
The utility model relates to an optical system technical field especially relates to a mixed optical system is moulded to glass.
Background
With the development of intelligent monitoring, people have a demand for smaller volume of monitoring instruments. The larger aperture, the higher resolution and the wide monitoring range are used for monitoring the main melody of the product updating iteration. However, the lens size required to meet these performance requirements tends to be larger, which is contrary to the need and desire for smaller monitoring instruments. Therefore, a large number of monitoring lenses with small volume and good imaging performance are urgently needed in the market.
SUMMERY OF THE UTILITY MODEL
For solving the problem that above-mentioned prior art exists, the utility model aims to provide a mixed optical system is moulded to glass of small volume has wide-angle, big light ring, can reach the confocal and high low temperature stable imaging performance of high resolution, day night of eight million pixels.
To achieve the above object, the present invention provides a glass-plastic hybrid optical system, including: the optical lens system comprises a first lens, a second lens, a third lens, a fourth lens, a fifth lens and a sixth lens, wherein the first lens, the second lens, the third lens, the fourth lens, the fifth lens and the sixth lens are sequentially arranged along an optical axis from an object side to an image side, the third lens is an aspheric lens, the second lens and the third lens have positive focal power or negative focal power, the third lens is a paraxial region convex-concave lens, the fifth lens is a paraxial region concave-concave lens, and the whole group focal length F of the optical system and the total optical length TTL of the optical system meet the following requirements: TTL/F is more than or equal to 6.7 and less than or equal to 7.0.
According to an aspect of the present invention, in a direction from an object side to an image side along an optical axis,
the first lens is a convex-concave lens;
the second lens is a paraxial region concave-convex lens;
the fourth lens is a convex lens;
the sixth lens is a paraxial convex lens.
According to an aspect of the present invention, the first lens and the fourth lens are spherical lenses;
the second lens, the fifth lens, and the sixth lens are aspheric lenses.
According to an aspect of the present invention, the second lens, the third lens, the fifth lens and the sixth lens are plastic lenses.
According to an aspect of the present invention, the optical module further includes a diaphragm located between the second lens and the third lens, between the third lens and the fourth lens, or on an image side surface of the third lens.
According to the utility model discloses an aspect, the compound focal length Fa of diaphragm thing side lens with optical system's whole group's focus F satisfies: the absolute Fa/F is more than or equal to 1.2 and less than or equal to 3.9.
According to an aspect of the utility model, the combination focus Fb of diaphragm image side lens with optical system's whole group's focus F satisfies: the absolute Fb/F is more than or equal to 1.7 and less than or equal to 2.2.
According to an aspect of the present invention, the air space D12 between the first lens and the second lens and the total optical length TTL of the optical system satisfy: D12/TTL is more than or equal to 0.10 and less than or equal to 0.13.
According to an aspect of the utility model, optical system's entrance pupil diameter ENPD with optical system's total optical length TTL satisfies: ENPD/TTL is more than or equal to 0.065 and less than or equal to 0.10.
According to an aspect of the present invention, the central curvature radius R1 of the object side surface of the first lens and the central curvature radius R2 of the image side surface of the first lens satisfy: 4.8 is less than or equal to R1/R2 is less than or equal to 7.0.
According to an aspect of the present invention, the optical system has a back focus BFL and a distance TL on the optical axis between the object side of the first lens and the image side of the sixth lens is satisfied: BFL/TL is more than or equal to 0.38 and less than or equal to 0.41.
According to an aspect of the present invention, the fourth lens face side is up to the distance D45 of the fifth lens object side on the optical axis and the whole group focal length F of the optical system satisfy: D45/F is more than or equal to 0.02 and less than or equal to 0.05.
According to an aspect of the present invention, the focal length F5 of the fifth lens, the focal length F6 of the sixth lens and the entire group focal length F of the optical system satisfy: (F5+ F6)/F is less than or equal to 0.1 and less than or equal to 0.4.
According to an aspect of the present invention, the total optical length TTL of the optical system, the image height H corresponding to the maximum field angle of the optical system and the maximum field angle FOV of the optical system satisfy: TTL/H/FOV is more than or equal to 0.02 and less than or equal to 0.04.
According to an aspect of the present invention, the distance D456 from the object-side surface of the fourth lens to the image-side surface of the sixth lens and the total optical length TTL of the optical system satisfy: D456/TTL is more than or equal to 0.2 and less than or equal to 0.35.
According to the utility model discloses a scheme is through the shape of optimal configuration lens, the focal power of each lens of rational distribution, combination for this mixed optical system is moulded to glass has big angle, big light ring, high resolution, the confocal and high low temperature stable imaging performance of day night, can realize maximum aperture FNO1.6, and its resolution power reaches eight million pixels, and the target surface of formation of image can reach 1/2.7 ", realizes that object space angle of vision is greater than 125 image capture. By adopting the scheme of mixing the glass lens and the plastic lens for use, the confocal of visible light and infrared light can be realized, the cost of the lens of the optical system is effectively reduced, and the glass-plastic mixed optical system is ensured not to be virtual-burnt within the temperature range of-40-80 ℃.
According to the utility model discloses a scheme is through rationally setting up the proportional relation between focal length, interval isoparametric of this optical system's whole group focus, optics total length, optics back burnt and each lens, can make when this optical system's camera lens keeps above-mentioned equivalent performance high quality formation of image, the volume reduces greatly, CRA is less than or equal to 16, the many money sensors of adaptation.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the embodiments will be briefly described below. It is obvious that the drawings in the following description are only some embodiments of the invention, and that for a person skilled in the art, other drawings can be derived from them without inventive effort.
Fig. 1 schematically shows a structural diagram of a glass-plastic hybrid optical system according to a first embodiment of the present invention;
fig. 2 is a schematic structural diagram of a glass-plastic hybrid optical system according to a second embodiment of the present invention;
fig. 3 schematically shows a structural schematic diagram of a glass-plastic hybrid optical system according to a third embodiment of the present invention.
Detailed Description
The embodiments described in this specification are to be considered in all respects as illustrative and not restrictive, and the appended drawings are intended to be part of the entire specification. In the drawings, the shape or thickness of the embodiments may be exaggerated and simplified or conveniently indicated. Further, the components of the structures in the drawings are described separately, and it should be noted that the components not shown or described in the drawings are well known to those skilled in the art.
Any reference to directions and orientations to the description of the embodiments herein is merely for convenience of description and should not be construed as limiting the scope of the present invention in any way. The following description of the preferred embodiments refers to combinations of features which may be present independently or in combination, and the present invention is not particularly limited to the preferred embodiments. The scope of the present invention is defined by the claims.
Referring to fig. 1, the embodiment of the present invention provides a glass-plastic hybrid optical system including: in the direction from the object side to the image side along the optical axis, a first lens L1 having negative optical power, a second lens L2 having positive or negative optical power, a third lens L3 having positive or negative optical power, a fourth lens L4 having positive optical power, a fifth lens L5 having negative optical power, a sixth lens L6 having positive optical power, and a parallel plate C are arranged in this order. The glass-plastic hybrid optical system further includes a stop STO located between the second lens L2 and the third lens L3, on the image-side surface of the third lens L3, or between the third lens L3 and the fourth lens L4. In an embodiment of the present invention, the first lens L1 is a convex-concave lens, the second lens L2 is a paraxial region convex-concave lens, the third lens L3 is a paraxial region convex-concave lens, the fourth lens L4 is a convex-convex lens, the fifth lens L5 is a paraxial region concave-concave lens, and the sixth lens L6 is a paraxial region convex-convex lens. By optimizing the shape of the configuration lens and reasonably distributing and combining the focal powers of all the lenses, the glass-plastic mixed optical system has imaging performances of large angle, large aperture, high resolution, day and night confocal and high and low temperature stability, can realize FNO1.6 with maximum aperture, has the resolution of up to eight million pixels, has the imaging target surface of up to 1/2.7', and realizes image capture with the object field angle of more than 125 degrees.
In the embodiment of the present invention, the first lens L1 and the fourth lens L4 are spherical lenses, and the second lens L2, the third lens L3, the fifth lens L5 and the sixth lens L6 are aspheric lenses. The second lens L2, the third lens L3, the fifth lens L5, and the sixth lens L6 are all plastic lenses. By reasonably using the glass and plastic lenses, the optical system can realize confocal of visible light and infrared light, ensure that the glass-plastic mixed optical system does not generate virtual focus within the temperature range of-40 ℃ to 80 ℃, and simultaneously effectively reduce the cost of the glass-plastic mixed optical system.
In the embodiment of the present invention, the combined focal length Fa of the object-side lens (i.e. the first lens L1, the second lens L2, and the third lens L3 as shown in fig. 1 and fig. 3, or the first lens L1 and the second lens L2 as shown in fig. 2) of the stop STO satisfies the entire group focal length F of the optical system: the absolute Fa/F is more than or equal to 1.2 and less than or equal to 3.9. The combined focal length Fb of the image-side lens (i.e., the fourth lens L4, the fifth lens L5, and the sixth lens L6 as shown in fig. 1 and 3, or the third lens L3, the fourth lens L4, the fifth lens L5, and the sixth lens L6 as shown in fig. 2) of the stop STO satisfies, with the entire group focal length F of the optical system: the absolute Fb/F is more than or equal to 1.7 and less than or equal to 2.2. The ratio relation between the focal length of the lens groups on the two sides of the stop STO and the focal length of the whole group of the optical system is set, so that the integral imaging performance of the glass-plastic hybrid optical system is improved.
The embodiment of the utility model provides an in, the air space D12 of first lens L1 and second lens L2 satisfies with optical system's total optical length TTL: D12/TTL is more than or equal to 0.10 and less than or equal to 0.13. The air space between the first lens L1 and the second lens L2 is reasonably increased, so that the light rays are smoothly transited in the glass-plastic mixed optical system, and the imaging quality of the optical system is improved.
The embodiment of the utility model provides an in, optical system's entrance pupil diameter ENPD satisfies with optical system's optics total length TTL: ENPD/TTL is more than or equal to 0.065 and less than or equal to 0.10. Through the proportional relation of reasonable entrance pupil diameter that sets up optical system and optical system overall length, guarantee that this mixed optical system is moulded to glass has great relative aperture, be favorable to this mixed optical system is moulded to glass simultaneously under the environment that night or light are not enough, carry out high definition formation of image.
In the embodiment of the present invention, the central curvature radius R1 of the object side of the first lens L1 and the central curvature radius R2 of the image side of the first lens L1 satisfy: 4.8 is less than or equal to R1/R2 is less than or equal to 7.0. The first lens L1 can collect light with a large field of view, which is beneficial to increase the light flux.
In the embodiment of the present invention, the distance TL on the optical axis between the optical back focus BFL of the optical system and the object side of the first lens L1 to the image side of the sixth lens L6 satisfies: BFL/TL is more than or equal to 0.38 and less than or equal to 0.41. By reasonably controlling the proportional relation between the back focal length of the glass-plastic mixed optical system and the length of the lens group of the optical system, the structure of the optical system is compact, the sensitivity of the lens to the Modulation Transfer Function (MTF) of the glass-plastic mixed optical system is reduced, the production yield of products is improved, and the production cost is reduced.
In the embodiment of the present invention, the distance D45 between the image side of the fourth lens L4 and the object side of the fifth lens L5 on the optical axis and the whole group focal length F of the optical system satisfy: D45/F is more than or equal to 0.02 and less than or equal to 0.05. Through the ratio relation of the lens interval that rationally sets up fourth lens L4 and fifth lens L5 and the whole focus of whole optical system, be favorable to more light to pass through fifth lens L5, improve this glass and mould mixed optical system's formation of image luminance.
The embodiment of the utility model provides an in, the focus F5 of fifth lens L5, the focus F6 of sixth lens L6 satisfies with optical system's whole group focus F: (F5+ F6)/F is less than or equal to 0.1 and less than or equal to 0.4. The ratio relation between the focal lengths of the fifth lens L5 and the sixth lens L6 and the focal length of the whole optical system is reasonably set, so that the smooth transition of light rays can be facilitated, and the chromatic aberration of the system can be corrected.
The embodiment of the utility model provides an in, optical system's whole group focus F satisfies with optical system's optics total length TTL: TTL/F is more than or equal to 6.7 and less than or equal to 7.0. The total optical length TTL of the optical system, the image height H corresponding to the maximum field angle of the optical system and the maximum field angle FOV of the optical system satisfy the following conditions: TTL/H/FOV is more than or equal to 0.02 and less than or equal to 0.04. The relationship among the parameters of the whole group of focal length, the total optical length, the image height, the field angle and the like of the optical system is reasonably set, so that the miniaturization design is facilitated, and the size of the lens under the condition of the same imaging surface and the same image height can be smaller.
In the embodiment of the present invention, the distance D456 from the object-side surface of the fourth lens L4 to the image-side surface of the sixth lens L6 satisfies the total optical length TTL of the optical system: D456/TTL is more than or equal to 0.2 and less than or equal to 0.35. Therefore, the tolerance of the fourth lens, the fifth lens and the sixth lens can be reduced, the assembly yield of the lens is improved, the main ray inclination angle CRA of the lens is smaller than or equal to 16 degrees, the lens can be adapted to a plurality of sensors (sensors), the application prospect is wide, and the market competitiveness is improved.
In conclusion, the optical structure of the glass-plastic mixed optical system can realize the maximum aperture FNO1.6, the resolution power can reach 8 million pixels, the imaging target surface can reach 1/2.7', the visible light and the infrared light are confocal, the image capture with the object space field angle larger than 125 degrees can be realized, the virtual focus is not generated in the temperature range of minus 40-80 ℃, and the glass-plastic mixed optical system is suitable for different environments. Meanwhile, the size is greatly reduced while the imaging with the same performance is kept, the cost of the lens of the glass-plastic mixed optical system is effectively reduced, the CRA (cross-cut line) of the lens is smaller than or equal to 16 degrees, the lens can be adapted to various sensors, and the application prospect is wide.
The glass-plastic hybrid optical system of the present invention is specifically described below with reference to three embodiments in conjunction with the accompanying drawings and tables. In each of the following embodiments, the present invention records the stop STO as one surface and records the image plane IMA as one surface.
The parameters of each example specifically satisfying the above conditional expressions are shown in table 1 below:
| conditional formula (VII) | Example one | Example two | EXAMPLE III |
| 0.10≤D12/TTL≤0.13 | 0.113 | 0.111 | 0.107 |
| 0.065≤ENPD/TTL≤0.10 | 0.092 | 0.092 | 0.089 |
| 4.8≤R1/R2≤7.0 | 6.925 | 5.028 | 5.081 |
| 1.2≤|Fa/F|≤3.9 | 1.648 | 1.374 | 3.786 |
| 1.7≤|Fb/F|≤2.2 | 1.762 | 1.90 | 1.987 |
| 0.38≤BFL/TL≤0.41 | 0.394 | 0.402 | 0.402 |
| 0.02≤D45/F≤0.05 | 0.021 | 0.024 | 0.043 |
| -0.40≤(F5+F6)/F≤0.1 | -0.40 | -0.35 | 0.08 |
| 0.02≤TTL/H/FOV≤0.04 | 0.027 | 0.027 | 0.027 |
| 6.7≤TTL/F≤7.0 | 6.792 | 6.824 | 6.847 |
| 0.2≤D456/TTL≤0.35 | 0.33 | 0.327 | 0.231 |
TABLE 1
In various embodiments of the present invention, the glass-plastic hybrid optical system's plastic aspheric lens satisfies the following formula:
in the above formula, z is the axial distance from the curved surface to the vertex at the position of the height h perpendicular to the optical axis along the optical axis direction; c represents the curvature at the apex of the aspherical surface; k is a conic coefficient; a. the 4 、A 6 、A 8 、A 10 、A 12 、A 14 、A 16 The aspherical coefficients of the fourth, sixth, eighth, tenth, twelfth, fourteenth and sixteenth orders are expressed respectively.
Example one
Referring to fig. 1, the parameters of the glass-plastic hybrid optical system of the present embodiment are as follows:
FNO: 1.61; total optical length: 22.41 mm; the field angle: 125.4 degrees. The second lens L2 has positive power, and the third lens L3 has negative power.
Table 2 lists the relevant parameters of each lens in the glass-plastic hybrid optical system of the present embodiment, including: surface type, radius of curvature R value, thickness, refractive index of the material, and abbe number.
| Number of noodles | Surface type | R value | Thickness of | Refractive index | Abbe number |
| S1 | Spherical surface | 21.095 | 0.600 | 1.73 | 54.70 |
| S2 | Spherical surface | 3.046 | 2.542 | ||
| S3 | Aspherical surface | -3.51 | 2.684 | 1.54 | 55.71 |
| S4 | Aspherical surface | -4.369 | 0.070 | ||
| S5 | Aspherical surface | 6.567 | 2.427 | 1.64 | 23.53 |
| S6 | Aspherical surface | 5.563 | 0.634 | ||
| S7(STO) | Spherical surface | Infinity | -0.350 | ||
| S8 | Spherical surface | 4.853 | 4.967 | 1.50 | 81.61 |
| S9 | Spherical surface | -4.853 | 0.080 | ||
| S10 | Aspherical surface | -10.263 | 0.730 | 1.64 | 23.53 |
| S11 | Aspherical surface | 11.08 | 0.070 | ||
| S12 | Aspherical surface | 8.885 | 1.540 | 1.54 | 55.71 |
| S13 | Aspherical surface | -5.873 | 0.300 | ||
| S14 | Spherical surface | Infinity | 0.800 | 1.52 | 64.20 |
| S15 | Spherical surface | Infinity | 5.320 | ||
| S16(IMA) | Spherical surface | Infinity | - | - | - |
TABLE 2
Table 3 lists the aspherical coefficients of the aspherical lenses of the glass-plastic hybrid optical system of the present embodiment, including: the quadric surface constant K and the fourth-order aspheric surface coefficient A of the surface 4 Sixth order aspherical surface coefficient A 6 Eighth order aspheric surface coefficient A 8 Ten-order aspheric surface coefficient A 10 And a twelfth order aspherical surface coefficient A 12 。
TABLE 3
As shown in fig. 1 and tables 1 to 3, the optical structure and parameter index of the glass-plastic hybrid optical system of the present embodiment can achieve a maximum aperture FNO of 1.6, a resolution of 8 megapixels, a target imaging surface of 1/2.7 ″, a confocal visible light and infrared light, and an image capture with an object field angle greater than 125 ° can be achieved, and the system is free from virtual focus in a temperature range of-40 ℃ to 80 ℃, and is applicable to different environments. Meanwhile, the size is greatly reduced while the imaging with the same performance is kept, the cost of the lens of the glass-plastic mixed optical system is effectively reduced, the CRA (cross-cut line) of the lens is smaller than or equal to 16 degrees, the lens can be adapted to various sensors, and the application prospect is wide.
Example two
Referring to fig. 2, the parameters of the glass-plastic hybrid optical system of the present embodiment are as follows:
FNO: 1.64 of; total optical length: 22.42 mm; the field angle: 125 deg. The second lens L2 has negative power, and the third lens L3 has positive power.
Table 4 lists the relevant parameters of each lens in the glass-plastic hybrid optical system of the present embodiment, including: surface type, radius of curvature R value, thickness, refractive index of the material, and abbe number.
TABLE 4
Table 5 lists the aspherical coefficients of the aspherical lenses of the glass-plastic hybrid optical system of the present embodiment, including: the conic surface constant K and fourth-order aspheric surface coefficient A 4 Sixth order aspherical surface coefficient A 6 Eighth order aspheric surface coefficient A 8 Ten-order aspheric surface coefficient A 10 And a twelfth order aspherical surface coefficient A 12 。
| Noodle sequence number | K | A 4 | A 6 | A 8 | A 10 | A 12 |
| S3 | -1.976E+00 | -2.617E-03 | 3.750E-04 | -5.099E-05 | 5.447E-06 | -2.463E-07 |
| S4 | -3.892E+00 | -2.230E-04 | 2.270E-04 | -4.268E-05 | 5.903E-06 | -2.633E-07 |
| S6 | -4.926E+00 | 2.448E-03 | -1.558E-05 | -1.354E-05 | 2.346E-06 | -1.078E-07 |
| S7 | 0.000E+00 | 1.035E-03 | 5.466E-05 | -1.477E-05 | 1.247E-06 | -4.356E-09 |
| S10 | 0.000E+00 | -3.079E-03 | -5.891E-04 | 7.681E-06 | -1.139E-07 | 1.027E-07 |
| S11 | -2.381E+00 | -1.025E-03 | -3.105E-04 | -3.747E-05 | 1.336E-05 | -1.328E-06 |
| S12 | -4.982E+00 | 8.813E-05 | 1.499E-04 | 3.074E-05 | 4.417E-06 | -1.798E-07 |
| S13 | 1.566E+00 | -2.682E-04 | -3.000E-05 | 1.384E-04 | -2.020E-05 | 2.606E-06 |
TABLE 5
As shown in fig. 2 and tables 1, 2, 4, and 5, the optical structure and parameter index of the glass-plastic hybrid optical system of the present embodiment can achieve the maximum aperture FNO1.6, the resolving power can reach 8 megapixels, the imaging target surface can reach 1/2.7 ″, the visible light and the infrared light are confocal, and image capture with an object field angle of 125 ° can be achieved, and virtual focus is not generated in a temperature range of-40 ℃ to 80 ℃, and the glass-plastic hybrid optical system is applicable to different environments. Meanwhile, the size is greatly reduced while the imaging with the same performance is kept, the cost of the lens of the glass-plastic mixed optical system is effectively reduced, the CRA (cross-cut line) of the lens is smaller than or equal to 16 degrees, the lens can be adapted to various sensors, and the application prospect is wide.
EXAMPLE III
Referring to fig. 3, the parameters of the glass-plastic hybrid optical system of the present embodiment are as follows:
FNO: 1.64 of; total optical length: 22.43 mm; the field angle: 125 deg. Wherein the second lens L2 and the third lens L3 have positive optical power.
Table 6 lists relevant parameters of each lens in the glass-plastic hybrid optical system of the present embodiment, including: surface type, radius of curvature R value, thickness, refractive index of the material, and abbe number.
| Number of noodles | Surface type | R value | Thickness of | Refractive index | Abbe number |
| S1 | Spherical surface | 16.61 | 0.510 | 1.73 | 54.70 |
| S2 | Spherical surface | 3.269 | 2.404 | ||
| S3 | Aspherical surface | -3.894 | 2.801 | 1.54 | 55.71 |
| S4 | Aspherical surface | -4.853 | 0.955 | ||
| S5 | Aspherical surface | 11.532 | 2.802 | 1.64 | 23.53 |
| S6(STO) | Aspherical surface | 22.461 | 1.344 | ||
| S7 | Spherical surface | 6.8 | 2.510 | 1.50 | 81.61 |
| S8 | Spherical surface | -6.8 | 0.141 | ||
| S9 | Aspherical surface | -11.16 | 0.712 | 1.64 | 23.53 |
| S10 | Aspherical surface | 4.862 | 0.133 | ||
| S11 | Aspherical surface | 5.189 | 1.697 | 1.54 | 56.10 |
| S12 | Aspherical surface | -6.461 | 0.300 | ||
| S13 | Spherical surface | Infinity | 0.800 | 1.52 | 64.20 |
| S14 | Spherical surface | Infinity | 5.326 | ||
| S15(IMA) | Spherical surface | Infinity | - | - | - |
TABLE 6
Table 7 lists aspheric coefficients of the aspheric lenses of the glass-plastic hybrid optical system of the present embodiment, including: the quadric surface constant K and the fourth-order aspheric surface coefficient A of the surface 4 Sixth order aspherical surface coefficient A 6 Eighth order aspheric surface coefficient A 8 Ten-order aspheric surface coefficient A 10 Twelve-order aspheric surface coefficient A 12 And fourteen order aspheric coefficients A 14 。
| Number of noodles | Value of K | A 4 | A 6 | A 8 | A 10 | A 12 | A 14 |
| S3 | -7.491E-01 | -4.426E-04 | 3.490E-05 | 5.878E-06 | 0.000E+00 | 0.000E+00 | 0.000E+00 |
| S4 | -7.065E-03 | 1.366E-03 | 8.422E-05 | 4.071E-06 | 0.000E+00 | 0.000E+00 | 0.000E+00 |
| S5 | -2.561E+01 | 2.212E-03 | -1.181E-04 | 1.910E-05 | -9.423E-07 | 0.000E+00 | 0.000E+00 |
| S6 | 0.000E+00 | -6.523E-04 | 3.584E-05 | 3.734E-06 | 0.000E+00 | 0.000E+00 | 0.000E+00 |
| S9 | 1.662E+01 | -4.214E-03 | 4.860E-04 | -1.719E-04 | 6.593E-05 | -1.087E-05 | 7.410E-07 |
| S10 | -1.468E+00 | -4.364E-03 | 3.730E-04 | -5.363E-05 | 1.443E-05 | -1.728E-06 | 0.000E+00 |
| S11 | 1.662E+00 | -5.060E-03 | 6.847E-04 | -1.766E-04 | 4.485E-05 | -4.556E-06 | 1.703E-07 |
| S12 | -1.473E-01 | 6.153E-04 | -3.507E-04 | 3.140E-04 | -6.937E-05 | 8.652E-06 | -2.651E-07 |
TABLE 7
As shown in fig. 3 and tables 1, 2, 6, and 7, the optical structure and parameter index of the glass-plastic hybrid optical system of the present embodiment can achieve the maximum aperture FNO1.6, the resolving power can reach 8 megapixels, the imaging target surface can reach 1/2.7 ″, the visible light and the infrared light are confocal, and image capture with an object field angle of 125 ° can be achieved, and virtual focus is not generated in the temperature range of-40 ℃ to 80 ℃, and the glass-plastic hybrid optical system is applicable to different environments. Meanwhile, the size is greatly reduced while the imaging with the same performance is kept, the cost of the lens of the glass-plastic mixed optical system is effectively reduced, the CRA (cross-cut line) of the lens is smaller than or equal to 16 degrees, the lens can be adapted to various sensors, and the application prospect is wide.
The above description is only a preferred embodiment of the present invention, and should not be taken as limiting the invention, and any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (15)
1. A glass-plastic hybrid optical system comprising: a first lens (L1), a second lens (L2), a third lens (L3), a fourth lens (L4) having positive refractive power, a fifth lens (L5) having negative refractive power, and a sixth lens (L6) having positive refractive power, which are arranged in this order from the object side to the image side along the optical axis, the third lens (L3) being an aspherical lens, characterized in that the second lens (L2) and the third lens (L3) have positive or negative refractive power, the third lens (L3) being a paraxial region convex-concave lens, the fifth lens (L5) being a paraxial region concave lens, and the total optical length TTL of the glass-plastic hybrid optical system and the entire group focal length F of the glass-plastic hybrid optical system satisfying: TTL/F is more than or equal to 6.7 and less than or equal to 7.0.
2. The glass-plastic hybrid optical system according to claim 1, wherein, in a direction from an object side to an image side along an optical axis,
the first lens (L1) is a convex-concave lens;
the second lens (L2) is a paraxial region meniscus lens;
the fourth lens (L4) is a convex lens;
the sixth lens (L6) is a paraxial convex lens.
3. The glass-plastic hybrid optical system according to claim 1, characterized in that the first lens (L1) and the fourth lens (L4) are spherical lenses;
the second lens (L2), the fifth lens (L5), and the sixth lens (L6) are aspherical lenses.
4. The glass-plastic hybrid optical system according to claim 1, wherein the second lens (L2), the third lens (L3), the fifth lens (L5), and the sixth lens (L6) are plastic lenses.
5. The glass-plastic hybrid optical system according to claim 1, further comprising a Stop (STO) located between the second lens (L2) and the third lens (L3), between the third lens (L3) and the fourth lens (L4), or on an image-side surface of the third lens (L3).
6. Glass-plastic hybrid optical system according to claim 5, characterized in that the combined focal length Fa of the objective-side lens of the diaphragm (STO) and the entire set of focal lengths F of the glass-plastic hybrid optical system satisfy: the absolute Fa/F is more than or equal to 1.2 and less than or equal to 3.9.
7. A glass-plastic hybrid optical system according to claim 5, characterized in that the combined focal length Fb of the image-side lens of the Stop (STO) and the entire set of focal lengths F of the glass-plastic hybrid optical system satisfy: the absolute Fb/F is more than or equal to 1.7 and less than or equal to 2.2.
8. The glass-plastic hybrid optical system according to any one of claims 1-7, wherein the air separation D12 of the first lens (L1) and the second lens (L2) and the total optical length TTL of the glass-plastic hybrid optical system satisfy: D12/TTL is more than or equal to 0.10 and less than or equal to 0.13.
9. The glass-plastic hybrid optical system according to any one of claims 1-7, wherein an entrance pupil diameter ENPD of the glass-plastic hybrid optical system and a total optical length TTL of the glass-plastic hybrid optical system satisfy: ENPD/TTL is more than or equal to 0.065 and less than or equal to 0.10.
10. The glass-plastic hybrid optical system according to any one of claims 1-7, characterized in that the central radius of curvature R1 of the object-side surface of the first lens (L1) and the central radius of curvature R2 of the image-side surface of the first lens (L1) satisfy: 4.8 is less than or equal to R1/R2 is less than or equal to 7.0.
11. The glass-plastic hybrid optical system according to any one of claims 1-7, wherein a distance TL on an optical axis from an object-side surface of the first lens (L1) to an image-side surface of the sixth lens (L6) to an optical back focus BFL of the glass-plastic hybrid optical system satisfies: BFL/TL is more than or equal to 0.38 and less than or equal to 0.41.
12. The glass-plastic hybrid optical system according to any one of claims 1-7, wherein an axial distance D45 between an image side surface of the fourth lens (L4) and an object side surface of the fifth lens (L5) and a whole group focal length F of the glass-plastic hybrid optical system satisfy: D45/F is more than or equal to 0.02 and less than or equal to 0.05.
13. The glass-plastic hybrid optical system according to any one of claims 1-7, wherein the focal length F5 of the fifth lens (L5), the focal length F6 of the sixth lens (L6) and the entire set of focal lengths F of the glass-plastic hybrid optical system satisfy: (F5+ F6)/F is less than or equal to 0.1 and less than or equal to 0.4.
14. The glass-plastic hybrid optical system according to any one of claims 1-7, wherein the total optical length TTL of the glass-plastic hybrid optical system, the image height H corresponding to the maximum field angle of the glass-plastic hybrid optical system and the maximum field angle FOV of the glass-plastic hybrid optical system satisfy: TTL/H/FOV is more than or equal to 0.02 and less than or equal to 0.04.
15. The glass-plastic hybrid optical system according to any one of claims 1-7, characterized in that a distance D456 from an object-side surface of the fourth lens (L4) to an image-side surface of the sixth lens (L6) and a total optical length TTL of the glass-plastic hybrid optical system satisfy: D456/TTL is more than or equal to 0.2 and less than or equal to 0.35.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114839744A (en) * | 2022-05-05 | 2022-08-02 | 舜宇光学(中山)有限公司 | Glass-plastic mixed optical system |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114839744A (en) * | 2022-05-05 | 2022-08-02 | 舜宇光学(中山)有限公司 | Glass-plastic mixed optical system |
| CN114839744B (en) * | 2022-05-05 | 2024-03-19 | 舜宇光学(中山)有限公司 | Glass-plastic mixed optical system |
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