CN210155385U - High-resolution infrared ultra-wide-angle lens - Google Patents
High-resolution infrared ultra-wide-angle lens Download PDFInfo
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- CN210155385U CN210155385U CN201920949804.4U CN201920949804U CN210155385U CN 210155385 U CN210155385 U CN 210155385U CN 201920949804 U CN201920949804 U CN 201920949804U CN 210155385 U CN210155385 U CN 210155385U
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Abstract
The utility model discloses an infrared super wide angle camera lens of high resolution includes from the object plane to image planes along the optical axis in proper order: a first lens having a negative refractive power; a second lens having a positive refractive power; a third lens having a positive refractive power; a fourth lens having a negative refractive power; a fifth lens having a positive refractive power. The utility model discloses be applied to non-refrigeration type 1024 x 768, the focal plane detector of 14 mu m of pixel size. The optical lens is composed of 5 lenses in total, the number of the lenses is small, and the structure is simple. Different lenses are combined with each other and the focal power is reasonably distributed, so that the high-resolution, large-field and athermal performances are realized.
Description
Technical Field
The utility model belongs to the technical field of optics, especially, relate to an infrared super wide angle optical system of high resolution who is applied to long wave non-refrigeration type infrared focal plane detector.
Background
A long-standing problem in the design of infrared optical systems is that a larger field angle is required in the design to obtain target image information in a larger spatial range. At the same time, the optical system is required to have a higher spatial resolution in order to obtain more spatial detail of the target. Both requirements form a pair of spears in case of a uniform distribution of detector pixels. A large field of view requires the optical system to have a smaller focal length where the imaging resolution is lower, while a high resolution requires the optical system to have a longer focal length but a smaller field of view. And the infrared optical system has the defects of image plane deviation, image blurring and the like under high and low temperature environments.
Thus, in the design of infrared optical systems, a tradeoff is made in how to achieve athermal designs while ensuring large fields of view and high resolution imaging.
At present, domestic research on high-resolution infrared ultra-wide angle optical systems has been reported in documents, such as: yangyojie 'optical design of a high-resolution refrigeration type medium-wave ultra-wide-angle infrared imaging system', aiming at a medium-wave 640 x 512 refrigeration detector, an optical lens for eliminating heat difference in a full-field 112 DEG and a spatial resolution 84.45 DEG within a temperature range of-55 ℃ to +80 ℃ is designed, and the optical lens can be used for a spacecraft autonomous navigation horizon (optical science and report. 2012,32 (8)). The invention discloses a novel long-wave infrared ultra-wide-angle lens which can be applied to a long-wave 640 multiplied by 512 and 17 mu m pixel non-refrigeration type detector, and designs a large-field high-resolution lens with a full field of view of 105 degrees and a spatial resolution of 87.66 inches. The Qi-protecting Hongxing unmanned aerial vehicle-mounted large-view-field high-resolution infrared imaging system is based on an uncooled infrared detector, selects a working waveband of 8-14 microns, adopts a design structure that a whole machine is swung and stopped and a 45-degree reflector is added, designs a large-view-field high-resolution lens with a full view field of 75 degrees and a spatial resolution of 82.5 degrees after image splicing, and can be matched with an unmanned aerial vehicle to work. (the unmanned aerial vehicle systems and mission load technology and applications seminar. 2015, TN 216). The invention relates to a light adjustable infrared vehicle-mounted ultra-wide-angle lens for Liutao, which designs a thermal difference eliminating optical lens with a full field of view of 110 degrees and a spatial resolution of 108.56 degrees in a temperature range of-20 ℃ to +60 ℃ aiming at a long-wave 384 multiplied by 288 non-refrigeration type detector. The visual angle range of the existing infrared ultra-wide angle lens is at most 150 degrees, and the spatial resolution is about 80'; if the spatial resolution is increased to 60 ", the super wide-angle lens has a viewing angle range of about 100 °.
The to-be-solved technical problem of the utility model is to non-refrigeration type 1024 x 768, 14 mu m focal plane detectors of pixel, provide a long wave infrared high resolution super wide angle poor camera lens of heat dissipation. The system has a full field of view of 145 degrees and a spatial resolution of 58.44 degrees, and keeps the stability of an image surface and image quality within a range of-40 ℃ to +50 ℃.
SUMMERY OF THE UTILITY MODEL
An object of the utility model is to provide a can acquire more space details and bigger space range, overcome the infrared super wide-angle lens of high resolution of the weak point that traditional camera lens performance index is low.
In order to achieve the above object, the utility model discloses a technical scheme include: a high-resolution infrared ultra-wide angle optical system comprises the following components in sequence from an object side to an image side: the lens comprises a first lens (1), a second lens (2), a third lens (3), a fourth lens (4) and a fifth lens (5).
Furthermore, the object side surface of the first lens (1) is a convex surface, the image side surface of the first lens is a concave surface, and the focal power of the first lens is negative; the first lens (1) is a meniscus negative lens, so that light rays can be effectively contracted, and the size of the lens is reduced.
Furthermore, the object side surface of the second lens (2) is a concave surface, the image side surface is a convex surface, and the focal power of the second lens is positive; the second lens (2) is a meniscus positive lens and can effectively correct field curvature.
Furthermore, the object side surface of the third lens (3) is a convex surface, the image side surface of the third lens is a concave surface, and the focal power of the third lens is positive; the third lens (3) is a positive lens, so that the influence of temperature change on the optical system can be effectively eliminated, and the environmental adaptability of the optical system is improved. And the diaphragm (8) of the optical system is located on the image side of the third lens.
Furthermore, the object side surface of the fourth lens (4) is a convex surface, the image side surface of the fourth lens is a concave surface, and the focal power of the fourth lens is negative; the fourth lens (4) is a negative meniscus lens, and the focal power of the first lens can be reasonably distributed.
Furthermore, the object side surface and the image side surface of the fifth lens (5) are convex surfaces, and the focal power of the fifth lens is positive. The fifth lens (5) is a biconvex positive lens and plays a role in temperature compensation.
Furthermore, the first lens (1), the second lens (2), the third lens (3), the fourth lens (4) and the fifth lens (5) all adopt high-order aspheric surfaces, and the object side surface of the fourth lens (4) adopts an aspheric surface superposed diffraction surface.
Further, the first lens (1) and the second lens (2) satisfy the following expression:
-3＜f1，2/f＜-0.1
in the formula (f)1，2Is the combined focal length of the first lens and the second lens; f denotes a focal length of the entire lens group.
In the embodiment of the utility model provides an in, optical lens comprises 5 pieces of lenses altogether, and the lens number is few, simple structure. Different lenses are combined with each other and the focal power is reasonably distributed, so that the high-resolution, large-field and athermal performances are realized.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings used in the description of the embodiments will be briefly described below.
Fig. 1 is an optical structure diagram of the high-resolution infrared ultra-wide-angle lens of the present invention;
wherein: 1. a first lens; 2. a second lens; 3. a third lens; 4. a fourth lens; 5. a fifth lens; 6. a detector protection glass; 7. a detector focal plane; 8. and (4) a diaphragm.
FIG. 2 is a diagram of the transfer function at 20 ℃ of the high resolution infrared super wide angle lens of the present invention;
FIG. 3 is a speckle pattern of the high resolution infrared super wide-angle lens of the present invention at 20 ℃;
FIG. 4 is a field curvature and distortion diagram of the high resolution infrared super wide angle lens of the present invention at 20 ℃;
FIG. 5 is a diagram of the transfer function at-40 ℃ of the high-resolution infrared super-wide-angle lens of the present invention;
FIG. 6 is a speckle pattern of the high resolution infrared super wide-angle lens of the present invention at-40 deg.C;
FIG. 7 is a field curvature and distortion diagram of the high resolution infrared super wide angle lens of the present invention at-40 deg.C;
FIG. 8 is a diagram of the transfer function at 50 ℃ of the high resolution infrared super wide angle lens of the present invention;
FIG. 9 is a speckle pattern of the high resolution infrared super wide-angle lens of the present invention at 50 ℃;
fig. 10 is a field curvature and distortion diagram of the high-resolution infrared super-wide-angle lens of the present invention at 50 ℃.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings and specific embodiments.
Fig. 1 is the optical structure diagram of the high-resolution infrared ultra-wide-angle lens of the present invention.
As shown in the figure, the utility model relates to an infrared super wide-angle lens of high resolution includes by the object space to the image space along the optical axis in proper order: the optical lens comprises a first lens (1) with negative focal power, a second lens (2) with positive focal power, a third lens (3) with positive focal power, a fourth lens (4) with negative focal power and a fifth lens (5) with positive focal power.
The embodiment of the utility model provides an in, first lens (1) are crescent negative lens, can effectively contract light, reduce the size of camera lens.
The second lens (2) is a meniscus positive lens and can effectively correct curvature of field.
The third lens (3) is a positive lens, so that the influence of temperature change on the optical system can be effectively eliminated, and the environmental adaptability of the optical system is improved. And the diaphragm (8) of the optical system is located on the image side of the third lens.
The fourth lens (4) is a negative meniscus lens, and the focal power of the first lens can be reasonably distributed.
The fifth lens (5) is a biconvex positive lens and plays a role of temperature compensation.
In order to improve the optical performance of the whole lens group, some lenses need to be specially designed to satisfy a specific expression so as to achieve a better imaging effect. In this example, f1，2-15.6mm, f-6 mm. The first lens (1) and the second lens (2) satisfy the following expression:
-3＜f1，2/f＜-0.1
in the formula (f)1，2Is the combined focal length of the first lens and the second lens; f denotes a focal length of the entire lens group.
After the expression is satisfied, the requirement of the large view field of the integral optical system can be ensured.
Specifically, in this embodiment, for an uncooled focal plane detector with a pixel size of 14 μm of 1024 × 768, the focal length f of the optical system is designed: 6mm, F number: 1.2, field of view: 121.6 ° × 107 °. More specifically, in order to improve the image quality and the influence of temperature change on the image quality, high-order aspheric surfaces are adopted in the first lens (1), the second lens (2), the third lens (3), the fourth lens (4) and the fifth lens (5). The object side surface of the fourth lens (4) adopts an aspheric surface superposed diffraction surface.
In the implementation, the addition of a diffraction surface on chalcogenide glass is avoided, the asphericity is less than 0.7mm, the optical processing and manufacturing are easy, the precision is easy to guarantee, and the production cost is reduced to the maximum extent.
Table 1 lists the aspherical coefficients of the surface S2 of the first lens 1, the surface S3 of the second lens 2, the surface S5 of the third lens 3, the surface S7 of the fourth lens 4, and the surface S9 of the fifth lens 5.
Aspheric coefficients of surfaces S2, S3, S5, S7 and S9 in Table 1
| Surface of | K | A | B | C | D |
| S2 | 0 | -1.9458e-05 | 3.7171e-8 | 6.7568e-11 | -9.5033e-13 |
| S3 | 0 | -4.7075e-06 | 1.1518e-8 | -9.7929e-11 | 1.6274e-13 |
| S5 | 0 | 2.7389e-06 | -5.0493e-09 | 6.5988e-12 | -1.2044e-14 |
| S7 | 0 | -1.9685e-05 | 1.2811e-08 | -4.8105e-10 | 3.0920e-13 |
| S9 | 0 | -6.8712e-06 | 2.3306e-09 | -1.6025e-12 | -9.3486e-15 |
The even aspheric equation is defined as follows:
table 2 lists the diffraction surface coefficients of the fourth lens 4.
TABLE 2 diffraction surface coefficients of surface S7
| Surface of | Diffraction order | Center wavelength (mum) | | C2 |
| S7 | ||||
| 1 | 10 | -6.3852e-04 | -2.7404e-06 |
Wherein C1 and C2 are respectively the 2-order item and the 4-order item coefficients of the diffraction surface.
The imaging quality is good due to the fact that the five aspheric surfaces and the diffraction surface are adopted in the imaging lens, the manufacturability is good, and the imaging lens has the effects of reducing cost and simplifying lenses.
Fig. 2 to fig. 4 are the image optics simulation data diagram of the high resolution infrared super wide angle lens of the present invention at 20 ℃, wherein fig. 2 is an optical transfer function (MTF) graph, the horizontal axis is the logarithm of lines per millimeter (lp/mm), the vertical axis is the contrast value, fig. 3 is a point diagram, and fig. 4 is a field curvature and distortion diagram. From the graph curves of fig. 2 to 4, it can be seen that the MTF, the root mean square value of the scattered spot, the field curvature and the distortion are all within the standard range at the temperature of 20 ℃.
Fig. 5 to 7 are graphs of imaging optical simulation data of the high-resolution infrared super-wide-angle lens of the present invention at-40 ℃, wherein fig. 5 is a graph of optical transfer function (MTF), the horizontal axis is the logarithm per millimeter (lp/mm), the vertical axis is the contrast value, fig. 6 is a plot, and fig. 7 is a graph of field curvature and distortion. From the graph curves of fig. 5 to 7, it can be seen that the MTF, the root mean square value of the diffuse speckles, the field curvature and the distortion at the temperature of-40 ℃ are all within the standard range.
Fig. 8 to 10 are graphs of imaging optical simulation data of the high-resolution infrared super-wide angle lens of the present invention at 50 ℃, wherein fig. 8 is a graph of optical transfer function (MTF), the horizontal axis is the logarithm per millimeter (lp/mm), the vertical axis is the contrast value, fig. 9 is a plot, and fig. 10 is a graph of field curvature and distortion. From the graph curves of fig. 8 to 10, it can be seen that the MTF, the root mean square value of the scattered spot, the field curvature and the distortion at the temperature of 50 ℃ are all within the standard range.
Therefore, the utility model discloses infrared super wide angle camera lens of high resolution all has good imaging quality at temperature range.
Finally, it should be noted that: the above embodiments are only used to illustrate the present invention and do not limit the technical solutions described in the present invention. Therefore, although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those skilled in the art that the present invention may be modified and equivalents may be substituted; all such modifications and variations are intended to be included herein within the scope of this disclosure and the present invention and within the scope of the following claims.
Claims (9)
1. The utility model provides an infrared super wide-angle lens of high resolution, its characterized in that includes from the object space to the image space in proper order: a first lens, a second lens, a third lens, a fourth lens, and a fifth lens; the object side surface of the first lens is a convex surface, the image side surface of the first lens is a concave surface, and the diopter of the first lens is negative; the object side surface of the second lens is a concave surface, the image side surface of the second lens is a convex surface, and the diopter of the second lens is positive; the object side surface of the third lens is a convex surface, the image side surface of the third lens is a concave surface, and the diopter of the third lens is positive; the object side surface of the fourth lens is a convex surface, the image side surface of the fourth lens is a concave surface, and the diopter of the fourth lens is negative; the object side surface of the fifth lens is a convex surface, the image side surface of the fifth lens is a convex surface, and the diopter of the fifth lens is positive.
2. The high resolution infrared ultra wide angle lens of claim 1, wherein the first lens is a negative meniscus lens that effectively retracts light and reduces the size of the lens.
3. The high resolution infrared ultra wide angle lens of claim 1, wherein the second lens is a positive meniscus lens effective to correct curvature of field.
4. The high-resolution infrared ultra-wide angle lens of claim 1, wherein the third lens is a positive lens and the stop of the optical system is located on an image side of the third lens.
5. The high resolution infrared ultra wide angle lens of claim 1, wherein the fourth lens is a negative meniscus lens.
6. The high resolution infrared ultra-wide angle lens of claim 1, wherein the fifth lens is a biconvex positive lens.
7. The high-resolution infrared ultra-wide angle lens of claim 1, wherein the first lens, the second lens, the third lens, the fourth lens and the fifth lens have aspherical surfaces; the fourth lens has a diffractive surface.
8. The high resolution infrared ultra wide angle lens of claim 1, wherein the first and second lenses satisfy the following expression:
-3＜f1，2/f＜-0.1
in the formula (f)1，2Is the combined focal length of the first lens and the second lens; f denotes a focal length of the entire lens group.
9. The high-resolution infrared ultra-wide angle lens according to any one of claims 1 to 8, wherein the lens is fixed, and the high-resolution infrared ultra-wide angle optical system is a non-movable prime lens.
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