CN215813528U - Compact continuous zoom refrigeration infrared objective lens - Google Patents
Compact continuous zoom refrigeration infrared objective lens Download PDFInfo
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- CN215813528U CN215813528U CN202120725101.0U CN202120725101U CN215813528U CN 215813528 U CN215813528 U CN 215813528U CN 202120725101 U CN202120725101 U CN 202120725101U CN 215813528 U CN215813528 U CN 215813528U
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Abstract
The utility model relates to the technical field of infrared optics, and particularly discloses a compact continuous zoom refrigeration infrared objective lens, which comprises: the device comprises a front fixed group, a zoom group, a first compensation group, a second compensation group and a rear fixed group; the front fixed group, the zooming group, the first compensation group, the second compensation group and the rear fixed group are sequentially arranged in a coaxial manner; the front fixing group comprises a first lens, the variable-power group comprises a second lens, the first compensation group comprises a third lens, the second compensation group comprises a fourth lens, the rear fixing group comprises a fifth lens and a sixth lens, and the fifth lens and the sixth lens are used as focusing groups at the same time. The utility model uses the refraction/diffraction surface in a mixed way, so that the system ensures the image quality and simplifies the optical structure form, the number of the lenses is small, the volume of the whole objective lens is smaller, and the use, the operation and the application range are more convenient.
Description
Technical Field
The utility model relates to the technical field of infrared optics, in particular to a compact continuous zooming refrigeration infrared objective lens.
Background
The uncooled infrared detector has the advantages of low price, small volume, light weight, low power consumption, high reliability and the like, so the uncooled infrared detector is widely applied, and is widely applied to various fields such as monitoring, warning, monitoring, reconnaissance, forest fire prevention and the like due to the all-weather day and night observation capability.
The problems in designing a continuous zoom non-refrigeration infrared objective optical system are that the zoom ratio is generally not large, and the optical length is long, while the traditional continuous zoom refrigeration infrared objective optical system has a complex structure and a large number of lenses, so that the system transmittance is low, the system resolution is low, the total optical length is long, and the overall dimension is large.
SUMMERY OF THE UTILITY MODEL
The utility model aims to provide a compact continuous zooming refrigeration infrared objective lens which can solve the problems in the prior art.
In order to solve the technical problems, the utility model adopts the following technical scheme:
a compact continuous zoom refrigeration infrared objective lens sequentially comprises from an object side to an image side: the device comprises a front fixed group, a zoom group, a first compensation group, a second compensation group and a rear fixed group; the front fixed group, the zooming group, the first compensation group, the second compensation group and the rear fixed group are sequentially arranged in a coaxial manner; the front fixing group comprises a first lens, the variable-power group comprises a second lens, the first compensation group comprises a third lens, the second compensation group comprises a fourth lens, the rear fixing group comprises a fifth lens and a sixth lens, and the fifth lens and the sixth lens are used as focusing groups at the same time.
Further, the first lens element is a meniscus positive lens element, the object-side surface of the first lens element is convex, the image-side surface of the first lens element is concave, and the diopter is positive.
Further, the second lens is a double-concave negative lens, the object side surface of the second lens is a concave surface, the image side surface of the second lens is a concave surface, and diopter of the second lens is negative.
Further, the third lens element is a biconvex positive lens element, the object-side surface of which is convex, the image-side surface of which is convex, and the diopter of which is positive.
Further, the fourth lens element is a negative meniscus lens element, the object-side surface of the fourth lens element is concave, the image-side surface of the fourth lens element is convex, and the diopter is negative.
Further, the fifth lens element is a biconvex positive lens element, the object-side surface of which is a convex surface, and diopter of which is positive.
Further, the sixth lens element is a negative meniscus lens element, the object-side surface of which is concave, the image-side surface of which is convex, and the refractive power of which is negative.
Furthermore, the second lens, the third lens, the fourth lens, the fifth lens and the sixth lens are all provided with high-order aspheric surfaces, and a diffraction surface is arranged on the object side surface of the second lens.
Compared with the prior art, the utility model has the following beneficial effects:
the focal power of a first lens of the objective lens 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 zoom group to perform linear movement to realize zoom; the focal power of the third lens is positive, and the third lens is used as a zoom group of the first compensation group to perform nonlinear linear movement to realize zoom compensation; the focal power of the fourth lens is negative, 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 negative, the fifth lens and the sixth lens jointly form a rear fixed group which is used as a focusing group to adjust the imaging effect and temperature compensation of the object at the distance; in addition, the utility model uses the refraction/diffraction surface in a mixed way, so that the system ensures the image quality and simplifies the optical structure form, the number of the lenses is small, the volume of the whole objective lens is small, and the use, the operation and the application range are more convenient.
The diffraction optical element has negative dispersion characteristics and negative temperature characteristics, and can realize phase modulation on an optical wave surface; the utility model introduces the second compensation group, improves the system image quality, shortens the total length of the system, has a field of view of 27 degrees multiplied by 21.7 to 2.2 degrees multiplied by 1.7 degrees, has a zoom ratio of 12.5 times, and has good image quality within the range of minus 40 ℃ to plus 50 ℃.
Description of the drawings:
FIG. 1 is a schematic diagram of the optical structure of the present invention in short focus.
FIG. 2 is a schematic diagram of the optical structure in focus of the present invention.
FIG. 3 is a schematic view of the optical structure of the present invention in the long focus.
FIG. 4 is a graph showing the transfer function at 20 ℃ in the case of short focus of the present invention.
FIG. 5 is a graph showing the transfer function at 20 ℃ in the case of the present invention.
FIG. 6 is a graph showing the transfer function at 20 ℃ in the case of the present invention.
FIG. 7 is a speckle pattern at 20 ℃ in the short-focus of the present invention.
FIG. 8 is a speckle pattern at 20 ℃ in the present invention.
FIG. 9 is a speckle pattern at 20 ℃ in the case of scorching according to the present invention.
FIG. 10 is a distortion diagram at 20 ℃ in the short-focus state of the present invention.
FIG. 11 is a distortion diagram at 20 ℃ in the case of the present invention.
FIG. 12 is a diagram showing distortion at 20 ℃ in the case of the present invention.
Description of reference numerals: 1-first lens, 2-second lens, 3-third lens, 4-fourth lens, 5-fifth lens, 6-sixth lens.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the utility model and are not intended to limit the utility model.
Examples
A compact continuous zoom refrigeration infrared objective lens sequentially comprises from an object side to an image side: the device comprises a front fixed group, a zoom group, a first compensation group, a second compensation group and a rear fixed group; the front fixed group, the zooming group, the first compensation group, the second compensation group and the rear fixed group are sequentially arranged in a coaxial manner; the front fixed group is a first lens 1, the first lens 1 is a meniscus positive 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 diopter of the first lens is positive, and the first lens 1 is used as the front fixed group, so that light rays can be effectively contracted, and the size of the lens is reduced; the zoom group is a second lens 2, the second lens 2 adopts a double-concave negative lens, the object side surface of the second lens is a concave surface, the object side surface is provided with a diffraction surface, the image side surface is a concave surface, the diopter is negative, and the second lens 2 is used as the zoom group and can effectively correct curvature of field and distortion; the first compensation group is a third lens 3, the third lens 3 is a biconvex positive lens, the object side surface of the third lens is a convex surface, the image side surface of the third lens is a convex surface, the diopter of the third lens is positive, and the third lens 3 is used as the first compensation group and can effectively correct curvature of field and spherical aberration; the second compensation group is a fourth lens 4, the fourth lens 4 is a meniscus negative lens, the object side surface of the fourth lens is a concave surface, the image side surface of the fourth lens is a convex surface, diopter of the fourth lens is negative, and the fourth lens 4 is used as the second compensation group and can effectively correct chromatic aberration; the rear fixed group comprises a fifth lens 5 and a sixth lens 6, the fifth lens 5 and the sixth lens 6 are used as focusing groups at the same time, the fifth lens 5 is a biconvex positive lens, the object side surface of the fifth lens is a convex surface, and the diopter of the fifth lens is positive; the sixth lens element 6 is a negative meniscus lens element with a concave object-side surface, a convex image-side surface, and a negative refractive power.
In this embodiment, for an uncooled infrared detector with a 640 × 512 pixel size of 15 μm, the focal length f of the optical system is designed: 20 mm-250 mm, F number: 4.0, field of view: 27 ° × 21.7 ° -2.2 ° × 1.7 °;
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 second lens 2, the third lens 3, the fourth lens 4, the fifth lens 5 and the sixth lens 6.
The following table shows aspheric coefficients of the surface S4 of the second lens 2, the surface S5 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.
TABLE 1 aspheric coefficients of surfaces S3, S6, S7, S9, S11
| Surface of | K | A | B | C | D |
| S4 | 0 | -1.03722E-05 | 6.02489E-09 | -2.12445E-11 | 9.92247E-14 |
| S5 | 0 | -1.78894E-05 | 1.29358E-08 | -3.77365E-12 | -1.17080 |
| S7 | |||||
| 0 | 2.60739E-04 | -1.46658E-06 | 2.00505E-08 | -6.52020E-11 | |
| S9 | 0 | -1.53933E-04 | -1.25183E-06 | -6.12298E-08 | 9.66732E-10 |
| S11 | 0 | 5.48716E-04 | 7.93372E-07 | -4.63874E-10 | 8.63041E-11 |
The aspherical surfaces of the above lenses satisfy the relational expression (the even-order aspherical surface equation is defined as follows):
wherein Z is the distance rise from the vertex of the aspheric surface when the aspheric surface is at the position with the height of y along the optical axis direction; c is 1/R, R represents the paraxial radius of curvature of the mirror surface; k is the cone coefficient; A. b, C, D are high-order aspheric coefficients.
Table 2 lists the diffraction surface coefficients of the second lens 2.
TABLE 2 diffraction surface coefficients for surface S4
| Surface of | Diffraction order | Center wavelength (mum) | C1 | |
| S3 | ||||
| 1 | 4.25 | -2.0978E-05 | -5.3130E-07 |
Wherein C1 and C2 are respectively the 2-order item and the 4-order item coefficients of the diffraction surface.
This embodiment adopts 5 aspheres, 1 diffraction face just to reach good imaging quality, and the manufacturability is good, can reduce lens quantity, and can reduce cost.
FIGS. 4-12 are graphs of optical simulation data of the present invention at 20 deg.C, wherein FIGS. 4-12 are graphs of optical transfer function (MTF) plotted with log lines per millimeter (lp/mm) on the horizontal axis and contrast values on the vertical axis; fig. 4 to 12 are dot charts, and fig. 4 to 12 are distortion charts. From the graph curves of fig. 4 to 12, it can be seen that the MTF, the root mean square value of the scattered spot and the distortion are all within the standard range at the temperature of 20 ℃, and the system requirements are met.
The embodiment is applied to an infrared detector with the resolution of 640 multiplied by 512 and the pixel size of 15 mu m, has a small number of lenses, has a continuous zooming function, and has good image quality within the range of-40 ℃ to +50 ℃.
Reference throughout this specification to "an embodiment" means that a particular feature, structure, or characteristic described in connection with the embodiment is included in at least one embodiment described generally in this application. The appearances of the same phrase in various places in the specification are not necessarily all referring to the same embodiment. Further, when a particular feature, structure, or characteristic is described in connection with any embodiment, it is submitted that it is within the scope of the utility model to effect such feature, structure, or characteristic in connection with other embodiments.
Although the utility model has been described herein with reference to a number of illustrative embodiments thereof, it should be understood that numerous other modifications and embodiments can be devised by those skilled in the art that will fall within the spirit and scope of the principles of this disclosure. More specifically, various variations and modifications are possible in the component parts and/or arrangements of the subject combination arrangement within the scope of the disclosure, the drawings and the appended claims. In addition to variations and modifications in the component parts and/or arrangements, other uses will also be apparent to those skilled in the art.
Claims (6)
1. The utility model provides a continuous variable magnification refrigeration infrared objective of compact which characterized in that: the device comprises the following components in sequence from an object side to an image side: the device comprises a front fixed group, a zoom group, a first compensation group, a second compensation group and a rear fixed group; the front fixed group, the zooming group, the first compensation group, the second compensation group and the rear fixed group are sequentially arranged in a coaxial manner; preceding fixed group includes first lens (1), the group of becoming doubly is including second lens (2), first compensation group includes third lens (3), second compensation group includes fourth lens (4), the fixed group of back includes fifth lens (5) and sixth lens (6), fifth lens (5) and sixth lens (6) are simultaneously as focusing group, fifth lens (5) are biconvex positive lens, and its object side is the convex surface, and diopter is positive, sixth lens (6) are meniscus negative lens, and its object side is the concave surface, and the image side is the convex surface, and diopter is negative.
2. The compact continuous variable-magnification refrigerating infrared objective lens according to claim 1, characterized in that: the first lens (1) is a meniscus positive 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 diopter of the first lens is positive.
3. The compact continuous variable-magnification refrigerating infrared objective lens according to claim 1, characterized in that: the second lens (2) is a double-concave negative lens, the object side surface of the second lens is a concave surface, the image side surface of the second lens is a concave surface, and diopter of the second lens is negative.
4. The compact continuous variable-magnification refrigerating infrared objective lens according to claim 1, characterized in that: the third lens (3) is a biconvex positive lens, the object side surface of the third lens is a convex surface, the image side surface of the third lens is a convex surface, and diopter of the third lens is positive.
5. The compact continuous variable-magnification refrigerating infrared objective lens according to claim 1, characterized in that: the fourth lens (4) is a meniscus negative lens, the object side surface of the fourth lens is a concave surface, the image side surface of the fourth lens is a convex surface, and diopter of the fourth lens is negative.
6. The compact continuous variable-magnification refrigerating infrared objective lens according to claim 1, characterized in that: the second lens (2), the third lens (3), the fourth lens (4), the fifth lens (5) and the sixth lens (6) are all provided with high-order aspheric surfaces, and the object side surface of the second lens (2) is provided with a diffraction surface.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202120725101.0U CN215813528U (en) | 2021-04-09 | 2021-04-09 | Compact continuous zoom refrigeration infrared objective lens |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202120725101.0U CN215813528U (en) | 2021-04-09 | 2021-04-09 | Compact continuous zoom refrigeration infrared objective lens |
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| Publication Number | Publication Date |
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| CN215813528U true CN215813528U (en) | 2022-02-11 |
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| CN202120725101.0U Active CN215813528U (en) | 2021-04-09 | 2021-04-09 | Compact continuous zoom refrigeration infrared objective lens |
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2021
- 2021-04-09 CN CN202120725101.0U patent/CN215813528U/en active Active
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