CN217443630U - High-resolution camera lens optical system - Google Patents
High-resolution camera lens optical system Download PDFInfo
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- CN217443630U CN217443630U CN202220901957.3U CN202220901957U CN217443630U CN 217443630 U CN217443630 U CN 217443630U CN 202220901957 U CN202220901957 U CN 202220901957U CN 217443630 U CN217443630 U CN 217443630U
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Abstract
The utility model relates to a high resolution camera shooting objective optical system, which comprises a lens front group, a diaphragm and a lens rear group which are arranged along an optical axis in sequence from an incident light direction; the front lens group comprises a double-cemented lens and a plano-convex negative focal power fourth lens, wherein the double-cemented lens and the plano-convex negative focal power fourth lens are sequentially arranged; the lens rear group comprises a fifth lens with double convex positive focal power and a sixth lens with double concave negative focal power which are arranged in sequence. The system is designed in an optical passive athermalization way, and can clearly image within the temperature range of-20 ℃ to 60 ℃; all the lenses are glass spherical lenses, the optical property is stable, and the processing and detection process is mature. The optical system can be applied to various small-caliber gun axis correction systems which need high resolution and high environmental adaptability.
Description
Technical Field
The utility model relates to a camera lens field, in particular to high resolution camera lens optical system, this camera lens optical system are applicable to the high resolution camera system that small-bore artillery axis was rectified.
Background
With the technical development and progress of the optical and electronic industries, the requirements of the camera objective lens used in various fields and scenes on resolution are higher and higher, and especially the environmental adaptability requirements of the scenes such as military artillery axis calibration, target tracking observation and the like are very strict.
At present, most of high-resolution camera lenses are designed into two groups, for example, in patent CN202886715U, "a novel high-resolution optical lens", two groups of 9-piece designs are adopted, and the lenses are designed into spherical surfaces, but no thermal difference elimination treatment is performed, so that the imaging quality of the objective lens in high and low temperature environments cannot be ensured; patent CN0109188658A "25 mm large target surface high definition 4K aspheric surface optical system and imaging method" adopts two sets of 7 pieces of design, and realizes 4K high resolution and zero temperature drift, but adopts plastic material and aspheric surface, the optical property of the plastic material is unstable, and the aspheric surface has high requirements for processing and detection.
In order to ensure the high stability of optical properties and reduce the difficulty of processing and detection, two groups of high-resolution camera lenses which fully adopt glass spherical surfaces need to be designed, and high resolution and zero temperature drift need to be realized simultaneously so as to meet the strict requirements of the axis correction of small-caliber artillery on the camera lenses.
SUMMERY OF THE UTILITY MODEL
An object of the utility model is to overcome prior art not enough, provide a high resolution camera objective optical system.
The utility model adopts the technical proposal that:
a high resolution camera shooting objective optical system comprises a lens front group, a diaphragm and a lens rear group which are sequentially arranged along an optical axis from an incident light direction; the front lens group comprises a double-cemented lens and a plano-convex negative focal power fourth lens, wherein the double-cemented lens and the plano-convex negative focal power fourth lens are sequentially arranged; the lens rear group comprises a fifth lens with double convex positive focal power and a sixth lens with double concave negative focal power which are arranged in sequence.
Further, the first lens satisfies the following expression:
1.17<∣f1/EFL∣<1.28
wherein f1 is the focal length of the first lens; the EFL is the focal length of the entire camera objective system.
Further, a double cemented lens of the second lens and the third lens satisfies the following expression:
13.24<∣f2/EFL∣<23.31
wherein f2 is the focal length of the doublet; the EFL is the focal length of the entire camera objective system.
Further, the fourth lens satisfies the following expression:
4.07<∣f3/EFL∣<5.17
wherein f3 is the focal length of the fourth lens; the EFL is the focal length of the entire camera objective system.
Further, the fifth lens satisfies the following expression:
0.58<∣f4/EFL∣<0.71
wherein f4 is the focal length of the fifth lens; the EFL is the focal length of the entire camera objective system.
Further, the sixth lens satisfies the following expression:
0.28<∣f5/EFL∣<0.44
wherein f5 is the focal length of the sixth lens; the EFL is the focal length of the entire camera objective system.
Further, the diaphragm is arranged between the fourth lens and the fifth lens and used for limiting off-axis rays, so that astigmatism and distortion of the system are reduced.
Furthermore, the double cemented lens is composed of a second lens and a third lens with different refractive indexes and different chromatic dispersions, which is beneficial to reducing the spherical aberration and chromatic aberration of the system.
Furthermore, the optical system of the photographic objective is designed in an optically passive athermalization way, and can clearly image within the temperature range of-20 ℃ to 60 ℃.
Furthermore, the first lens, the second lens, the third lens, the fourth lens, the fifth lens and the sixth lens are all glass spherical lenses, so that the optical properties are stable, and the processing and detecting processes are mature.
The utility model has the advantages that:
the utility model discloses a high resolution camera lens optical system adopts the symmetrical structure of two sets of 6 pieces, has eliminated astigmatism and distortion effectively. The double-cemented lens is adopted, the length of the camera lens is effectively reduced, and chromatic aberration is eliminated. The optical system has high angle precision and high resolution, and can ensure clear imaging within the temperature range of-20 ℃ to 60 ℃. All the lenses are glass spherical lenses, the optical property is stable, and the processing and detection process is mature.
Drawings
Fig. 1 is a schematic structural diagram of an optical system of a high-resolution image pickup objective according to an embodiment of the present invention.
Fig. 2 is a Field Curvature (Field Curvature) characteristic curve diagram of the high-resolution imaging objective optical system according to the embodiment of the present invention.
Fig. 3 is a graph showing Distortion (Distortion) characteristics of the optical system of the high-resolution imaging objective lens according to the embodiment of the present invention.
Fig. 4 is a vertical axis chromatic aberration (lareal Color) characteristic curve diagram of the high resolution image pickup objective optical system according to the embodiment of the present invention.
Fig. 5 is a Spot Diagram (Spot Diagram) of each field of view at normal temperature (20 ℃) of the high-resolution imaging objective optical system according to the embodiment of the present invention.
Fig. 6 is a dot Diagram (Spot Diagram) of each field of view at a low temperature (-20 ℃) of the high-resolution imaging objective optical system according to the embodiment of the present invention.
Fig. 7 is a dot map (Spot map) of each field of view at a high temperature (60 ℃) of the optical system of the high-resolution imaging objective lens according to the embodiment of the present invention.
Wherein: 10 is a front lens group, 20 is a diaphragm, 30 is a rear lens group, 40 is protective glass, and 50 is an imaging surface; 101 is a first lens, 102 is a second lens, 103 is a third lens, and 104 is a fourth lens; the fifth lens 305 and the sixth lens 306.
Detailed Description
The technical solution of the present invention will be further explained and explained with reference to fig. 1 to 7 in the embodiments of the present invention.
Example 1
As shown in fig. 1, there is a schematic configuration diagram of a high-resolution image pickup objective optical system including a front lens group 10, a diaphragm 20, a rear lens group 30, a cover glass 40, and an image plane 50, which are arranged in this order from an incident light direction along an optical axis.
The front lens group 10 comprises a first lens 101, a second lens 102, a third lens 103 and a fourth lens 104 which are arranged in sequence; the rear lens group 30 includes a fifth lens 305 and a sixth lens 306 arranged in series.
The optical power characterizes the refractive power of the optical system for an incident parallel light beam. The first lens, the second lens and the fifth lens are positive focal power lenses, and refraction is convergence; the third lens, the fourth lens and the sixth lens are negative-power lenses, and the refraction is divergence.
The first lens satisfies the following expression:
1.17<∣f1/EFL∣<1.28
wherein f1 is the focal length of the first lens; the EFL is the focal length of the entire camera objective system.
The double cemented lens of the second lens and the third lens satisfies the following expression:
13.24<∣f2/EFL∣<23.31
wherein f2 is the focal length of the doublet; the EFL is the focal length of the entire camera objective system.
The fourth lens satisfies the following expression:
4.07<∣f3/EFL∣<5.17
wherein f3 is the focal length of the fourth lens; the EFL is the focal length of the entire camera objective system.
The fifth lens satisfies the following expression:
0.58<∣f4/EFL∣<0.71
wherein f4 is the focal length of the fifth lens; the EFL is the focal length of the entire camera objective system.
The sixth lens satisfies the following expression:
0.28<∣f5/EFL∣<0.44
wherein f5 is the focal length of the sixth lens; the EFL is the focal length of the entire camera objective system.
The diaphragm is positioned between the front lens group and the rear lens group, namely arranged between the fourth lens and the fifth lens, and is used for limiting off-axis rays, avoiding generating serious astigmatism and distortion, and simultaneously enabling the structural symmetry to be beneficial to correcting coma aberration.
The double-cemented lens is arranged in the front lens group and is combined by a second lens and a third lens with different refractive indexes and different chromatic dispersions, so that the spherical aberration and the chromatic aberration of the camera lens are eliminated, and meanwhile, the length of the camera lens is effectively reduced.
The optical system of the high-resolution camera objective is designed to be optically passive without heating, the first lens, the second lens, the third lens, the fourth lens, the fifth lens and the sixth lens are made of different materials, the thermal difference is eliminated by utilizing the temperature characteristics of the different materials, the optical system can clearly image within the temperature range of-20 ℃ to 60 ℃, and the imaging quality of the camera objective under various different environmental conditions can be ensured.
The first lens, the second lens, the third lens, the fourth lens, the fifth lens and the sixth lens are all glass spherical lenses, glass materials are resistant to high and low temperatures, optical properties are not prone to change, and meanwhile, the processing and detection processes of the glass spherical surfaces are mature.
The high-resolution camera objective optical system needs to be matched with a high-resolution device, a COMS imaging device with high resolution is adopted, and the target surface of the device is 1920 x 1080(H x V) @2.9 mu m, so that high resolution is realized.
The effective focal length of the high-resolution camera objective optical system is more than or equal to 72.5mm, and the size of an image is ensured by ensuring the length of the effective focal length; the rear intercept is more than or equal to 3.95mm, and compatibility of various COMS imaging devices is guaranteed; the half field angle of the first lens end is more than or equal to 3.4 degrees, and a certain field range of the observation scene is ensured; the total optical length of the objective lens is less than or equal to 95mm, and the size of the camera objective lens can be effectively reduced by limiting the length of the objective lens; f/#isless than or equal to 2.9, and the larger numerical aperture can ensure that a camera lens is used for scene observation at night; the illumination of the edge of the field of view is more than 96 percent, and the illumination uniformity of the COMS imaging target surface of the camera lens is ensured.
In this embodiment, the imaging quality of the imaging objective lens is extremely high. As shown in FIG. 2, the field curvature is controlled in the range of-20 μm to +20 μm. As shown in fig. 3, the distortion is controlled to be within 0.5%. As shown in fig. 4, the homeotropic chromatic aberration is controlled within the allium spot range.
The high-resolution image pickup objective optical system in the present embodiment has high angular accuracy and high resolution. As shown in fig. 5, the dot charts of each field of view of the photographic objective at normal temperature are all in one allium spot range, and are basically in one pixel of the CMOS imaging target surface, so that extremely high angle accuracy is achieved. The angle precision calculation expression of the camera lens is as follows:
wherein α represents the angular accuracy of the imaging objective; m represents the pixel size of the COMS imaging target surface and is 2.9 mu M; the f' object represents the effective focal length of the camera objective, which is 72.5 mm.
As shown in fig. 6 and 7, the dot charts of the respective fields of view of the camera lens at low temperature (-20 ℃) and high temperature (60 ℃) are reduced by about 5% compared with the dot charts at normal temperature (20 ℃), so that the camera lens has stable imaging quality under high and low temperature environments.
The cutoff frequency calculation expression of the cmos imaging device is:
wherein f is Cutting block Representing the cutoff frequency of the cmos imaging device; m represents the pixel size of the COMS imaging target surface and is 2.9 μ M. At 173lp/mm spatial frequency, the MTF for each field of view is ≧ 48%, as shown in Table 1.
TABLE 1 optical transfer function (MTF) at Normal temperature
As shown in tables 2 and 3, the optical transfer functions of the camera objective lens at low temperature (-20 ℃) and high temperature (60 ℃) are not obviously reduced, and at the cut-off frequency of 173lp/mm, the MTF (mean transfer function) of each visual field is more than or equal to 48%, so that the stable imaging quality of the camera objective lens under the high and low temperature environment is ensured.
TABLE 2 optical transfer function (MTF) at Low temperatures
TABLE 3 optical transfer function (MTF) at high temperature
Therefore, the camera shooting objective lens can meet the requirements of high resolution, high angle precision and high environmental adaptability under the special scene of gun axis calibration.
Although the invention has been described herein with reference to the illustrated embodiments thereof, which are merely preferred embodiments of the invention, it is to be understood that the invention is not limited thereto, but is capable of numerous other modifications and embodiments, all falling within the scope of the invention.
Claims (10)
1. A high resolution camera shooting objective optical system is characterized by comprising a lens front group, a diaphragm and a lens rear group which are sequentially arranged along an optical axis from an incident light direction; the front lens group comprises a double-cemented lens and a plano-convex negative power fourth lens which are sequentially arranged, wherein the double-cemented lens consists of a double-convex positive power first lens, a double-convex positive power second lens and a double-concave negative power third lens; the lens rear group comprises a fifth lens with double convex positive focal power and a sixth lens with double concave negative focal power which are arranged in sequence.
2. The high resolution image pickup objective optical system according to claim 1, wherein the stop is provided between the fourth mirror and the fifth mirror for limiting off-axis rays and reducing astigmatism and distortion of the system.
3. The high resolution image pickup objective optical system according to claim 1, wherein the cemented doublet is composed of second and third lenses having different refractive indices and different chromatic dispersions for reducing spherical aberration and chromatic aberration of the system.
4. The high resolution imaging objective optical system according to claim 1, wherein the first lens satisfies the following expression:
1.17<∣f1/EFL∣<1.28
wherein f1 is the focal length of the first lens; the EFL is the focal length of the entire camera objective system.
5. The high resolution image pickup objective optical system according to claim 1, wherein a double cemented lens of the second lens and the third lens satisfies the following expression:
13.24<∣f2/EFL∣<23.31
wherein f2 is the focal length of the doublet; the EFL is the focal length of the entire camera objective system.
6. The high resolution imaging objective optical system according to claim 1, wherein the fourth lens satisfies the following expression:
4.07<∣f3/EFL∣<5.17
wherein f3 is the focal length of the fourth lens; the EFL is the focal length of the entire camera objective system.
7. The high resolution photographic objective optical system according to claim 1, characterized in that the fifth lens satisfies the following expression:
0.58<∣f4/EFL∣<0.71
wherein f4 is the focal length of the fifth lens; the EFL is the focal length of the entire camera objective system.
8. The high resolution imaging objective optical system according to claim 1, wherein the sixth lens satisfies the following expression:
0.28<∣f5/EFL∣<0.44
wherein f5 is the focal length of the sixth lens; the EFL is the focal length of the entire camera objective system.
9. The high resolution image pickup objective optical system according to any one of claims 1 to 8, wherein the image pickup objective optical system is optically passive athermalized and capable of clear image formation at a temperature ranging from-20 ℃ to 60 ℃.
10. The high resolution image pickup objective optical system according to any one of claims 1 to 8, wherein the first lens, the second lens, the third lens, the fourth lens, the fifth lens and the sixth lens are all glass spherical lenses.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202220901957.3U CN217443630U (en) | 2022-04-19 | 2022-04-19 | High-resolution camera lens optical system |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202220901957.3U CN217443630U (en) | 2022-04-19 | 2022-04-19 | High-resolution camera lens optical system |
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| CN217443630U true CN217443630U (en) | 2022-09-16 |
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| CN202220901957.3U Active CN217443630U (en) | 2022-04-19 | 2022-04-19 | High-resolution camera lens optical system |
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