CN109683295B - Long-focus short-wave infrared optical lens and electronic equipment applying same - Google Patents
Long-focus short-wave infrared optical lens and electronic equipment applying same Download PDFInfo
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- CN109683295B CN109683295B CN201811619849.1A CN201811619849A CN109683295B CN 109683295 B CN109683295 B CN 109683295B CN 201811619849 A CN201811619849 A CN 201811619849A CN 109683295 B CN109683295 B CN 109683295B
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- 230000003287 optical effect Effects 0.000 title claims abstract description 41
- 239000011521 glass Substances 0.000 claims description 25
- 239000000463 material Substances 0.000 claims description 20
- 238000003384 imaging method Methods 0.000 claims description 9
- 239000006185 dispersion Substances 0.000 claims description 8
- 239000002131 composite material Substances 0.000 claims description 6
- 239000005331 crown glasses (windows) Substances 0.000 claims description 6
- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 claims description 2
- 229910052788 barium Inorganic materials 0.000 claims description 2
- DSAJWYNOEDNPEQ-UHFFFAOYSA-N barium atom Chemical compound [Ba] DSAJWYNOEDNPEQ-UHFFFAOYSA-N 0.000 claims description 2
- 229910052698 phosphorus Inorganic materials 0.000 claims 1
- 239000011574 phosphorus Substances 0.000 claims 1
- 230000004075 alteration Effects 0.000 description 9
- 238000010586 diagram Methods 0.000 description 8
- 101001026208 Bos taurus Potassium voltage-gated channel subfamily A member 4 Proteins 0.000 description 5
- 238000012545 processing Methods 0.000 description 5
- 238000013461 design Methods 0.000 description 4
- 230000008030 elimination Effects 0.000 description 3
- 238000003379 elimination reaction Methods 0.000 description 3
- 238000003331 infrared imaging Methods 0.000 description 3
- 238000001228 spectrum Methods 0.000 description 3
- 230000009286 beneficial effect Effects 0.000 description 2
- 230000008859 change Effects 0.000 description 2
- 239000005308 flint glass Substances 0.000 description 2
- 125000001153 fluoro group Chemical group F* 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 230000004297 night vision Effects 0.000 description 2
- 230000032683 aging Effects 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 230000000903 blocking effect Effects 0.000 description 1
- WUKWITHWXAAZEY-UHFFFAOYSA-L calcium difluoride Chemical compound [F-].[F-].[Ca+2] WUKWITHWXAAZEY-UHFFFAOYSA-L 0.000 description 1
- 229910001634 calcium fluoride Inorganic materials 0.000 description 1
- 239000010436 fluorite Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012806 monitoring device Methods 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 238000012546 transfer Methods 0.000 description 1
- 238000002834 transmittance Methods 0.000 description 1
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Classifications
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B15/00—Optical objectives with means for varying the magnification
- G02B15/14—Optical objectives with means for varying the magnification by axial movement of one or more lenses or groups of lenses relative to the image plane for continuously varying the equivalent focal length of the objective
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B13/00—Optical objectives specially designed for the purposes specified below
- G02B13/14—Optical objectives specially designed for the purposes specified below for use with infrared or ultraviolet radiation
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- General Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Health & Medical Sciences (AREA)
- Toxicology (AREA)
- Lenses (AREA)
Abstract
The invention discloses a long-focus short-wave infrared optical lens and an electronic device applying the optical lens, wherein the optical lens comprises a front positive lens group with positive refractive power, a rear negative lens group with negative refractive power and an image surface which are arranged along light rays in sequence; the distance between the front positive lens group and the rear negative lens group is changed; the front positive lens group comprises at least two lenses, which are arranged in succession along a light ray; the rear negative lens group comprises a negative lens and a positive lens which are arranged in sequence along light rays.
Description
Technical Field
The invention relates to the technical field of optical system design, in particular to a long-focus short-wave infrared optical lens and electronic equipment applying the same.
Background
With the aging of short-wave infrared imaging devices, the application field of the short-wave infrared imaging devices is gradually expanded, particularly in the high-precision target tracking direction, the existing mature commercial products generally mainly use short focus, are applied to low-light-level night vision imaging systems, are not suitable for high-precision tracking, and provide the requirements of long-focus optical lenses.
The reflection structure optical system is not affected by chromatic aberration, but the central blocking of the reflection structure optical system affects effective transmittance, and the aspheric structure puts a high requirement on overall optical processing.
Disclosure of Invention
The invention provides a long-focus short-wave infrared optical lens and an electronic device using the same, which are used for overcoming the problem of large aberration in a long-focus transmission type optical lens in the prior art and realizing high-precision tracking and aiming of a low-light-level night vision imaging system.
In order to achieve the above object, the present invention provides a long-focus short-wave infrared optical lens, including:
the lens adopts a long-distance structure form, aims to realize that the length of a system cylinder is less than the focal length of the system, and is suitable for short-wave infrared low-light remote tracking and aiming; the distance of the front positive lens group from the rear negative lens group varies, and the following conditional expression is satisfied:
0.3375<d/f2<0.3385
where d is the distance between the front positive lens group and the rear negative lens group, f2Is the focal length of the rear negative lens group; the distance between the front positive lens group and the rear negative lens group changes along with the change of the position of the rear negative lens group, the front positive lens group and the rear negative lens group are combined to form an optical lens, and targets at different positions are focused and clearly imaged in a mode of adjusting the position of the rear negative lens group; the front positive lens group at least comprises two lenses which are arranged in sequence along light rays, and one lens with larger focal power is split into at least two lenses with the same focal power, so that the pressure of the single lens group is reduced, and meanwhile, the aberration elimination and the lens group processing are facilitated; the rear negative lens group comprises a negative lens and a positive lens, the negative lens and the positive lens are sequentially arranged along light, and targets at different positions are focused and clearly imaged in a mode of adjusting the position of the rear negative lens group.
Further, the front positive lens group includes at least two positive lenses.
Further, the front positive lens group sequentially comprises a first positive lens, a first negative lens and a second positive lens along light rays.
Furthermore, the front positive lens group and the rear negative lens group are made of glass combined materials with dispersion numerical values smaller than 0.001 and Abbe numbers larger than 25, the materials are selected according to the principle that 3 materials are selected on a partial dispersion diagram to enable the area of a triangle to be the largest, the front positive lens group and the rear negative lens group are designed in a complex achromatic mode, and are made of glass combined materials with approximate dispersion numerical values and large Abbe number differences, so that secondary spectrums can be effectively suppressed while achromatizing.
Further, the materials of the front positive lens group and the rear negative lens group are preferably phosphor crown glass PK52A and barium crown glass BAK4 produced by Schottky corporation.
Further, PK52A glass is adopted as the material of the first positive lens and the second positive lens, and BAK4 glass is adopted as the material of the first negative lens.
Further, the negative lens in the rear lens group is a second negative lens, the material of the second negative lens is glass PK52A, the positive lens in the rear lens group is a third negative positive lens, and the material of the third positive lens is glass BAK 4.
Further, the barrel length of the optical lens is smaller than the focal length of the optical lens.
Further, the specific parameters of the optical lens are as follows:
the focal length is 580-600mm, the aperture is 100mm, the tube length is 395-418mm, the imaging wave band is 950-1650 nm, and the field of view is 0-1.6 deg.
The invention also provides electronic equipment which comprises the long-focus short-wave infrared optical lens.
Compared with the prior art, the long-focus short-wave infrared lens provided by the invention has the beneficial effects that: the method adopts a reasonable apochromatic structure, selects glass composite materials with approximate dispersion numerical values and large abbe number difference, and focuses and clearly images targets at different positions by adjusting the position of the rear negative lens group, thereby realizing long-focus, achromatic and high-quality short-wave infrared imaging.
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 description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the structures shown in the drawings without creative efforts.
Fig. 1 is a schematic structural diagram of a long-focus short-wave infrared optical lens according to an embodiment of the present invention;
FIG. 2 is a schematic structural diagram of a front positive lens group according to an embodiment of the present invention;
FIG. 3 is a schematic structural diagram of a negative lens group according to an embodiment of the present invention;
FIG. 4 is a schematic diagram illustrating a chromatic aberration curve of a front positive lens group according to an embodiment of the present invention;
FIG. 5 is a schematic diagram illustrating a chromatic aberration curve of a rear negative lens group according to an embodiment of the present invention;
fig. 6 is a schematic diagram of MTF performance curves of modulation transfer functions provided in an embodiment of the present invention.
The reference numbers illustrate:
| reference numerals | Name (R) | Reference numerals | Name (R) |
| 1 | Front |
2 | Rear negative lens group |
| 11 | A first |
21 | Second |
| 12 | First |
22 | Third |
| 13 | Second |
3 | Image plane |
The implementation, functional features and advantages of the objects of the present invention will be further explained with reference to the accompanying drawings.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all embodiments, and all other embodiments obtained by a person of ordinary skill in the art without creative efforts based on the embodiments of the present invention belong to the protection scope of the present invention.
In order to achieve the purpose of the invention, the invention provides a long-focus short-wave infrared optical lens and an electronic device applying the optical lens.
In the first embodiment, please refer to fig. 1 and fig. 2, a front positive lens group 1 with positive refractive power, a rear negative lens group 2 with negative refractive power, and an image plane 3 are sequentially arranged along light; the front positive lens group 1 at least comprises two lenses which are arranged in sequence along light rays, and the lens with larger focal power is split into at least two lenses with the same focal power, so that the pressure of a single lens group is reduced, and meanwhile, the aberration elimination and the lens group processing are facilitated.
In this embodiment, the front positive lens 1 sequentially includes a first positive lens 11 made of PK52A glass along light rays, the first positive lens 11 is a biconvex lens, and the two surfaces have different radii of curvature, and specific parameters are shown in table 1; BAK4 glass is used as a material of the first negative lens 12, the first negative lens 12 is a biconcave lens, the curvature radiuses of two surfaces are different, and specific parameters are shown in Table 1; the material of the second positive lens 13 is PK52A glass, the second positive lens 13 is a biconvex lens, the curvature radiuses of two surfaces of the second positive lens are different, and specific parameters are shown in Table 1; the three lenses of the first positive lens 11, the first negative lens 12, and the second positive lens 13 are sequentially arranged along the optical axis as shown in fig. 2.
The rear negative lens group 2 comprises a negative lens and a positive lens which are arranged in sequence along light rays, and targets at different positions are focused and imaged clearly in a mode of adjusting the position of the rear negative lens group.
In this embodiment, the rear negative lens group 2 sequentially includes a second negative lens 21 made of PK52A glass along light rays, the second negative lens 21 is a biconcave lens, and the two surfaces have different radii of curvature, and the specific parameters are shown in table 1; BAK4 glass is used as the material of the third positive lens 22, the third positive lens 22 is a plano-convex lens, and specific parameters of the curvature radius of the two surfaces are shown in Table 1 and shown in figure 3.
The distance of the front positive lens group 1 from the rear negative lens group 2 varies, and the following conditional expression is satisfied:
0.3375<d/f2<0.3385
where d is the distance between the front positive lens group and the rear negative lens group, f2Is the focal length of the rear negative lens group; in this embodiment, the distance between preceding positive lens group 1 and the back negative lens group 2 changes along with the change of back negative lens group 2 position, to the target of the preceding different positions department of preceding positive lens group 1, through adjusting the position of back negative lens group 2, image on image plane 3, preceding positive lens group 1 forms the optical lens of teletransmission structural formula with the combination of back negative lens group 2, it is less than system's focus to realize the system tube length, be applicable to the infrared shimmer of shortwave long distance and follow sight, to the focus of different positions target, clear imaging.
The front positive lens group 1 and the rear negative lens group 2 are made of 3 materials on a partial dispersion diagram to enable the area of a triangle to be the largest, the front positive lens group 1 and the rear negative lens group 2 are designed by apochromatism, the front positive lens group 1 and the rear negative lens group 2 are made of glass composite materials with approximate dispersion values and large abbe number difference, secondary spectra can be effectively suppressed while achromatism is achieved, and the combination of PK52A glass and BAK4 glass is preferred.
The overall system design parameters are shown in table 1:
the specific parameters of the long-focus short-wave infrared optical lens realized by the invention are as follows: the focal length is 600mm, the caliber is 100mm, the cylinder length is 400mm, the imaging wave band is 950nm-1650nm, and the field of view is 1.6 degrees.
Referring to fig. 3, it is shown that the chromatic aberration curves of the front positive lens group 1 and the rear negative lens group 2 of the system are shown, and after the achromatic design of the system is seen, the secondary spectrum is very small, the influence on the system is negligible, and the requirement of the quality of the imaging system is met.
Referring to fig. 4, for the system MTF performance, the MTF value can reach more than 0.4 at 30lp to meet the quality requirement of the imaging system.
The second embodiment is different from the first embodiment in that the front positive lens group 1 and the rear negative lens group 2 of the present invention are made of glass composition materials with close dispersion values and large abbe numbers, and the glass composition materials may be special glass materials of fluoro crown glass S-FPL51, fluoro crown glass S-FPL53, fluorite CaF2Is matched and combined with special glass material flint glass S-BSL7 and flint glass S-LAL 14.
Third embodiment, on the basis of the first embodiment, the difference from the first embodiment is that the front positive lens group 1 of the present invention includes a positive lens with larger focal power, the front positive lens group 1 can also be a positive lens, achromatism can be realized, and clear imaging of targets at different positions can be realized by changing the rear negative lens group 2.
The fourth embodiment is different from the third embodiment in that the front positive lens group 1 of the present invention can be a positive lens with a larger focal power and split into at least two lenses with the same focal power, the transmissive optical lens has a large field angle, and the processing process is simple, but the overall aberration of the transmissive optical lens is designed to be large, in order to ensure good image surface brightness, all wavelength bands are covered as much as possible in the optical system design, the front positive lens group 1 of the third embodiment includes a positive lens with a larger focal power and split into at least two lenses with the same focal power, and the splitting of one lens into a plurality of lenses can reduce the pressure of the monolithic lens group, and is beneficial to the elimination of aberration and the processing of the lens group.
The invention also provides an electronic device, which comprises the long-focus short-wave infrared optical lens, namely, the long-focus short-wave infrared optical lens is applied to the electronic device, and the electronic device can be a camera, an infrared microscope or a monitoring device.
The above description is only a preferred embodiment of the present invention, and is not intended to limit the scope of the present invention, and all modifications and equivalents of the present invention, which are made by the contents of the present specification and the accompanying drawings, or directly/indirectly applied to other related technical fields, are included in the scope of the present invention.
Claims (8)
1. A long-focus short-wave infrared optical lens is characterized by comprising a front positive lens group (1) with positive refractive power, a rear negative lens group (2) with negative refractive power and an image surface (3); the front positive lens group (1) is provided with a first positive lens (11), a first negative lens (12) and a second positive lens (13) which are arranged in sequence along light; the rear negative lens group (2) has a negative lens and a positive lens, which are arranged one after the other along the light ray; the distance of the front positive lens group (1) from the rear negative lens group (2) varies, and the following conditional expression is satisfied:
0 .3375<d/f2<0 .3385
wherein d is the distance between the front positive lens group (1) and the rear negative lens group (2), and f2 is the focal length of the rear negative lens group (2).
2. The long-focus short-wave infrared optical lens according to claim 1, wherein the materials selected for the front positive lens group (1) and the rear negative lens group (2) are glass composite materials with dispersion numbers less than 0.001 and abbe numbers greater than 25.
3. The long-focus short-wave infrared optical lens of claim 2, wherein the glass composition material is a combination of phosphorus crown glass PK52A and barium crown glass BAK 4.
4. The long-focus short-wave infrared optical lens as claimed in claim 3, wherein the materials of the first positive lens (11) and the second positive lens (13) are glass PK52A, and the material of the first negative lens (12) is glass BAK 4.
5. The long-focus short-wave infrared optical lens of claim 3, wherein the negative lens in the rear negative lens group (2) is a second negative lens (21), the material of the second negative lens (21) adopts glass PK52A, the positive lens in the rear negative lens group (2) is a third positive lens (22), and the material of the third positive lens (22) adopts glass BAK 4.
6. The long focus short wave infrared optical lens of any one of claims 1 to 5, wherein a barrel length of the optical lens is smaller than a focal length of the optical lens.
7. The long-focus short-wave infrared optical lens of any one of claims 1 to 5, wherein the optical lens has specific parameters: the focal length is 580-600mm, the aperture is 100mm, the tube length is 395-418mm, the imaging wave band is 950-1650 nm, and the field of view is 0-1.6 deg.
8. An electronic device, comprising the long-focus short-wave infrared optical lens according to any one of claims 1 to 7.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811619849.1A CN109683295B (en) | 2018-12-28 | 2018-12-28 | Long-focus short-wave infrared optical lens and electronic equipment applying same |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811619849.1A CN109683295B (en) | 2018-12-28 | 2018-12-28 | Long-focus short-wave infrared optical lens and electronic equipment applying same |
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| Publication Number | Publication Date |
|---|---|
| CN109683295A CN109683295A (en) | 2019-04-26 |
| CN109683295B true CN109683295B (en) | 2021-06-15 |
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1124355A (en) * | 1994-05-23 | 1996-06-12 | 中国科学院长春光学精密机械研究所 | Hybrid long focal length optical system |
| JP2013148651A (en) * | 2012-01-18 | 2013-08-01 | Olympus Corp | Microscope |
| CN104730694A (en) * | 2015-03-13 | 2015-06-24 | 中国科学院西安光学精密机械研究所 | Long-pupil-distance short-wave infrared spectrum imaging objective lens |
| CN106019542A (en) * | 2016-06-27 | 2016-10-12 | 中国科学院西安光学精密机械研究所 | Broadband multipurpose continuous zooming optical system |
| CN205809394U (en) * | 2016-07-06 | 2016-12-14 | 苏州大学 | Short-wave infrared broadband apochromatism image space telecentricity telephotolens |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104330871B (en) * | 2014-10-16 | 2017-09-26 | 中国科学院上海技术物理研究所 | A kind of short-wave infrared telephoto lens |
-
2018
- 2018-12-28 CN CN201811619849.1A patent/CN109683295B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1124355A (en) * | 1994-05-23 | 1996-06-12 | 中国科学院长春光学精密机械研究所 | Hybrid long focal length optical system |
| JP2013148651A (en) * | 2012-01-18 | 2013-08-01 | Olympus Corp | Microscope |
| CN104730694A (en) * | 2015-03-13 | 2015-06-24 | 中国科学院西安光学精密机械研究所 | Long-pupil-distance short-wave infrared spectrum imaging objective lens |
| CN106019542A (en) * | 2016-06-27 | 2016-10-12 | 中国科学院西安光学精密机械研究所 | Broadband multipurpose continuous zooming optical system |
| CN205809394U (en) * | 2016-07-06 | 2016-12-14 | 苏州大学 | Short-wave infrared broadband apochromatism image space telecentricity telephotolens |
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