CN220691184U - Light-small high-resolution uncooled infrared objective optical system - Google Patents
Light-small high-resolution uncooled infrared objective optical system Download PDFInfo
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- CN220691184U CN220691184U CN202320724058.5U CN202320724058U CN220691184U CN 220691184 U CN220691184 U CN 220691184U CN 202320724058 U CN202320724058 U CN 202320724058U CN 220691184 U CN220691184 U CN 220691184U
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- 230000005499 meniscus Effects 0.000 claims description 3
- 238000003384 imaging method Methods 0.000 description 4
- 230000004075 alteration Effects 0.000 description 2
- 239000000571 coke Substances 0.000 description 2
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- 238000012544 monitoring process Methods 0.000 description 2
- 238000002834 transmittance Methods 0.000 description 2
- 101100117236 Drosophila melanogaster speck gene Proteins 0.000 description 1
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- 238000010586 diagram Methods 0.000 description 1
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Abstract
The utility model discloses a light-small high-resolution uncooled infrared objective optical system, which relates to the technical field of uncooled infrared objective optical systems and comprises a front fixed group, a zoom group, a first compensation group, a second compensation group, a rear fixed group and a focusing group, wherein the front fixed group comprises a first lens, the zoom group comprises a second lens, the first compensation group comprises a third lens, the second compensation group comprises a fourth lens, the rear fixed group comprises a fifth lens and a sixth lens, and the focusing group comprises a sixth lens.
Description
Technical Field
The utility model relates to the technical field of uncooled infrared objective optical systems, in particular to a light-weight small-sized high-resolution uncooled infrared objective optical system.
Background
The uncooled infrared detector has important functions in the aspects of monitoring, fireproof monitoring, public security, side protection and warning and the like of a field, and can monitor the peripheral conditions all-weather and in a large range.
However, the problems faced by designing a continuous variable magnification uncooled infrared objective optical system of an uncooled infrared detector are as follows: the relative aperture is large, the F number is small (F number is the ratio of the focal length of the objective lens to the diameter of the entrance pupil of the objective lens, and is the reciprocal of the relative aperture), the short focal length is generally not small, at present, few continuous zoom objective lenses with the short focal length exceeding 25mm are arranged, and the overall dimension of the objective lens is large. The problems of the traditional continuous variable magnification uncooled infrared objective optical system are as follows: the utility model provides a light-small high-resolution uncooled infrared objective optical system, which has the advantages of complex structure, high lens number, low system transmittance, low system resolution, long optical total length and large external dimension.
Disclosure of Invention
In order to overcome the problems in the background technology, the utility model provides a light-small high-resolution uncooled infrared objective optical system, which can enable the volume of an objective to be light and small, improve the resolution, and solve the problems of complex structure, low system transmittance, low resolution and large external dimension of the traditional continuous zoom uncooled infrared objective optical system.
In order to achieve the above purpose, the utility model is realized by the following technical scheme:
a light-weight small-sized high-resolution uncooled infrared objective optical system is characterized in that: the optical system comprises a front fixed group, a variable magnification group, a first compensation group, a second compensation group, a rear fixed group and a focusing group, wherein the front fixed group, the variable magnification group, the first compensation group, the second compensation group, the rear fixed group and the focusing group are sequentially arranged from an object side to an image side in a common optical axis mode, the front fixed group comprises a first lens, the variable magnification group comprises a second lens, the first compensation group comprises a third lens, the second compensation group comprises a fourth lens, the rear fixed group comprises a fifth lens and a sixth lens, the focusing group comprises a sixth lens, high-order aspheric surfaces are adopted in the first lens, the second lens, the third lens, the fourth lens, the fifth lens and the sixth lens, and a diffraction surface on an aspheric substrate is adopted on an object side surface in the fourth lens.
Further, the first lens is a meniscus positive lens, the object side surface is a convex surface, the image side surface is a concave surface, and the diopter is positive.
Further, the second lens is a concave-convex negative lens, the object side is a convex surface, the image side is a concave surface, and the diopter is negative.
Further, the third lens is a concave-convex negative lens, the object side is a concave surface, the image side is a convex surface, and the diopter is negative.
Further, the fourth lens element is a concave-convex positive lens element, wherein the object-side surface of the fourth lens element is convex, the image-side surface of the fourth lens element is concave, and the diopter of the fourth lens element is positive.
Further, the fifth lens element is a biconvex positive lens element, with the object-side surface being convex, the image-side surface being convex, and the diopter being positive.
Further, the sixth lens is a convex-concave positive lens, the object side surface is a convex surface, the image side surface is a concave surface, and the diopter is positive.
Further, the light-small high-resolution uncooled infrared objective optical system is a movable continuous variable magnification objective.
Compared with the prior art, the utility model has the beneficial effects that:
the utility model introduces the second compensation group under the requirements of light and small high resolution, improves the image quality of the system, shortens the total length of the system, adopts high-order aspheric surfaces in the first lens to the sixth lens, adopts a diffraction surface on an aspheric substrate on the object side surface in the fourth lens, and adds the diffraction surface in the system, so that the system ensures the image quality, simplifies the optical structure form, has less lenses, has smaller volume of the whole objective lens, and is more convenient to use, operate and apply.
Drawings
For the purpose of clearly illustrating the technical solutions in the embodiments of the present utility model, the drawings that are required to be used in the description of the embodiments will be described.
FIG. 1 is a schematic view of the optical structure of the utility model in short focus;
FIG. 2 is a schematic view of the mid-focal optical structure of the present utility model;
FIG. 3 is a schematic diagram of the long Jiao Shiguang structure of the utility model;
FIG. 4 is a graph of the transfer function at 20deg.C for the short focal length of the present utility model;
FIG. 5 is a graph of the transfer function at 20℃for mid-coke in accordance with the present utility model;
FIG. 6 is a graph of the transfer function at 20℃for the long focus of the present utility model;
FIG. 7 is a plot of diffuse plaques at 20℃for the short focus of the present utility model;
FIG. 8 is a graph of diffuse plaques at 20℃in the middle focal position of the present utility model;
FIG. 9 is a plot of diffuse plaques at 20℃for the present utility model at the tele;
FIG. 10 is a graph of distortion at 20℃for a short focal length according to the present utility model;
FIG. 11 is a graph showing distortion at 20℃for the mid-coke of the present utility model;
FIG. 12 is a graph showing distortion at 20℃for the long focal length of the present utility model.
Detailed Description
In order to make the objects, technical solutions and advantageous effects of the present utility model more apparent, preferred embodiments of the present utility model will be described in detail below with reference to the accompanying drawings, so as to facilitate understanding of the skilled person.
This example is an example of the utility model applied to uncooled infrared detectors with a resolution of 1280×1024, a pixel size of 12 μm, and a temperature in the range of-40 ℃ to +50 ℃.
Fig. 1-3 illustrate the present utility model at focal length f:18 mm-60 mm, F number: 1.2, field of view: 46.21 DEG x 37.69 DEG to 14.58 DEG x 11.69 deg. Referring to fig. 1-3, a light-small high-resolution uncooled infrared objective optical system comprises a front fixed group, a zoom group, a first compensation group, a second compensation group, a rear fixed group and a focusing group, wherein the front fixed group, the zoom group, the first compensation group, the second compensation group, the rear fixed group and the focusing group are sequentially arranged from an object space to an image space in a common optical axis mode, the front fixed group comprises a first lens 1, the zoom group comprises a second lens 2, the first compensation group comprises a third lens 3, the second compensation group comprises a fourth lens 4, the rear fixed group comprises a fifth lens 5 and a sixth lens 6, the focusing group comprises a sixth lens 6, all of the first lens 1, the second lens 2, the third lens 3, the fourth lens 4, the fifth lens 5 and the sixth lens 6 adopt high-order aspheric surfaces, and an object side surface in the fourth lens 4 adopts a diffraction surface on an aspheric substrate.
The first lens focal power is positive and is used as a front fixed group; the focal power of the second lens is negative, and the second lens is used as a variable magnification group to realize variable magnification by linear and straight movement; the focal power of the third lens is negative, and the third lens is used as a first compensation group zoom group to perform nonlinear linear movement to realize zoom compensation; the focal power of the fourth lens is positive, and the fourth lens is used as a second compensation group to perform nonlinear linear movement to realize zoom compensation; the focal power of the fifth lens is positive, the focal power of the sixth lens is positive, the fifth lens and the sixth lens form a rear fixed group together, the sixth lens is used as a focusing group, the imaging effect and the temperature compensation of a target with a long distance and a short distance are regulated, a second compensation group is introduced under the requirements of light and small size and high resolution, the image quality of the system is improved, the total length of the system is shortened, the object side surface in the fourth lens 4 adopts a diffraction surface on an aspheric substrate, and the diffraction surface is added into the system.
Referring to fig. 1-3, the first lens element 1 is a positive meniscus lens element, with a convex object-side surface, a concave image-side surface, and a positive diopter, and is used as a front fixation assembly to effectively shrink light and reduce the size of the lens.
Referring to fig. 1-3, the second lens element 2 is a concave-convex negative lens element, has a convex object-side surface and a concave image-side surface, has negative diopter, and can effectively correct curvature of field and distortion as a magnification-varying group.
Referring to fig. 1-3, the third lens element 3 is a concave-convex negative lens element, has a concave object-side surface, a convex image-side surface, and a negative diopter, and is effective for correcting curvature of field and spherical aberration as a first compensation group.
Referring to fig. 1-3, the fourth lens element 4 is a concave-convex positive lens element, has a convex object-side surface, a concave image-side surface, and a positive refractive power, and is effective for correcting chromatic aberration as a second compensation group.
Referring to fig. 1-3, the fifth lens element 5 is a biconvex positive lens element, the object-side surface is a convex surface, the image-side surface is a convex surface, the sixth lens element 6 is a convex-concave positive lens element, the object-side surface is a convex surface, the image-side surface is a concave surface, the sixth lens element 6 is a focusing group, and the fifth lens element 5 and the sixth lens element 6 together form a rear fixing group of the system.
See fig. 1-3: the light-small high-resolution uncooled infrared objective optical system is a movable continuous variable magnification objective.
Referring to fig. 1 to 3, the first lens element 1 to the sixth lens element 6 each adopts a higher order aspheric surface, and more specifically, the first lens element (1), the second lens element (2), the third lens element (3), the fourth lens element (4), the fifth lens element (5) and the sixth lens element (6) each adopt a higher order aspheric surface in order to improve the image quality and improve the influence of temperature change on the image quality.
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 S6 of the third lens (3), the surface S7 of the fourth lens (4), the surface S9 of the fifth lens (5), and the surface S11 of the sixth lens (6).
| Surface of the body | K | A | B | C | D |
| S2 | 0 | 6.89906E-09 | 2.93465E-13 | 1.91801E-16 | -9.93603E-21 |
| S3 | 0 | 2.74899E-07 | -5.39179E-11 | -1.66052E-13 | 6.89836E-16 |
| S6 | 0 | 5.71069E-07 | -1.64975E-09 | 6.88070E-12 | -9.72087E-15 |
| S7 | 0 | 5.26610E-07 | -1.66665E-09 | 5.15663E-12 | -5.67481E-15 |
| S9 | 0 | -1.83433E-06 | 5.24521E-10 | -1.43987E-12 | 1.31272E-15 |
| S11 | 0 | -5.16923E-07 | -6.80389E-10 | 8.49234E-13 | -2.63987E-15 |
Table 1 aspherical coefficients of surfaces S3, S6, S7, S9, S11
The aspherical surface in the above lens satisfies the relation (even aspherical surface equation is defined as follows):
wherein Z is the height vector of the aspheric surface at the position with the height y along the optical axis direction, and the distance vector is higher from the vertex of the aspheric surface; c=1/R, R representing the paraxial radius of curvature of the mirror; k is a conical coefficient; A. b, C, D is a higher order aspheric coefficient.
Table 2 lists the diffraction plane coefficients of the fourth lens (2).
| Surface of the body | Diffraction orders | Center wavelength (mum) | C1 | C2 |
| S7 | 1 | 10 | -5.3194E-05 | 1.4083E-09 |
Table 2 diffraction plane coefficient of surface S7
Wherein C1 and C2 are the 2 nd order and 4 th order coefficients of the diffraction surface respectively.
The embodiment achieves good imaging quality by adopting 5 aspheric surfaces and 1 diffraction surface, has good manufacturability, can reduce the number of lenses and reduces the cost.
FIGS. 4 to 12 are graphs of simulated data of imaging optics at 20deg.C for a lightweight, compact, high resolution uncooled infrared objective of the present utility model, wherein FIGS. 4 to 6 are graphs of optical transfer function (MTF), with logarithmic numbers per millimeter (lp/mm) on the horizontal axis and contrast values on the vertical axis; fig. 7 to 9 are diffuse speckle patterns, and fig. 8 to 12 are distortion patterns. From the graph curves of fig. 4 to 12, it can be seen that the MTF, the root mean square value of the diffuse speck and the distortion at the temperature of 20 ℃ are all in the standard range, and meet the system requirements.
Therefore, the light and small high-resolution uncooled infrared objective lens has good imaging quality.
The foregoing description is only a preferred embodiment of the present utility model, but the scope of the present utility model is not limited thereto, and any person skilled in the art, who is within the scope of the present utility model, should make equivalent substitutions or modifications according to the technical solution of the present utility model and the inventive concept thereof, and should be covered by the scope of the present utility model.
Claims (8)
1. A light-weight small-sized high-resolution uncooled infrared objective optical system is characterized in that: the optical system comprises a front fixed group, a variable magnification group, a first compensation group, a second compensation group, a rear fixed group and a focusing group, wherein the front fixed group, the variable magnification group, the first compensation group, the second compensation group, the fifth lens (6) and the focusing group are sequentially arranged from an object space to an image space in a common optical axis mode, the front fixed group comprises a first lens (1), the variable magnification group comprises a second lens (2), the first compensation group comprises a third lens (3), the second compensation group comprises a fourth lens (4), the rear fixed group comprises a fifth lens (5) and a sixth lens (6), the focusing group comprises a sixth lens (6), the first lens (1), the second lens (2), the third lens (3), the fourth lens (4), the fifth lens (5) and the sixth lens (6) are high-order aspheric surfaces, and the object side surface of the fourth lens (4) is a diffraction surface on an aspheric surface substrate.
2. The lightweight, compact, high resolution uncooled infrared objective optical system of claim 1, wherein: the first lens (1) is a meniscus positive lens, the object side surface is a convex surface, the image side surface is a concave surface, and the diopter is positive.
3. The lightweight, compact, high resolution uncooled infrared objective optical system of claim 1, wherein: the second lens (2) is a concave-convex negative lens, the object side surface is a convex surface, the image side surface is a concave surface, and the diopter is negative.
4. The lightweight, compact, high resolution uncooled infrared objective optical system of claim 1, wherein: the third lens (3) is a concave-convex negative lens, the object side surface is a concave surface, the image side surface is a convex surface, and the diopter is negative.
5. The lightweight, compact, high resolution uncooled infrared objective optical system of claim 1, wherein: the fourth lens (4) is a concave-convex positive lens, the object side surface is a convex surface, the image side surface is a concave surface, and the diopter is positive.
6. The lightweight, compact, high resolution uncooled infrared objective optical system of claim 1, wherein: the fifth lens (5) is a biconvex positive lens, the object side surface is a convex surface, the image side surface is a convex surface, and the diopter is positive.
7. The lightweight, compact, high resolution uncooled infrared objective optical system of claim 1, wherein: the sixth lens (6) is a convex-concave positive lens, the object side surface is a convex surface, the image side surface is a concave surface, and the diopter is positive.
8. The lightweight, compact, high resolution uncooled infrared objective optical system of claim 1, wherein: the light-small high-resolution uncooled infrared objective optical system is a movable continuous zoom objective.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202320724058.5U CN220691184U (en) | 2023-04-04 | 2023-04-04 | Light-small high-resolution uncooled infrared objective optical system |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202320724058.5U CN220691184U (en) | 2023-04-04 | 2023-04-04 | Light-small high-resolution uncooled infrared objective optical system |
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| CN220691184U true CN220691184U (en) | 2024-03-29 |
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| CN202320724058.5U Active CN220691184U (en) | 2023-04-04 | 2023-04-04 | Light-small high-resolution uncooled infrared objective optical system |
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