CN111413786B - Short wave infrared/visible light double-light imaging lens - Google Patents
Short wave infrared/visible light double-light imaging lens Download PDFInfo
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- CN111413786B CN111413786B CN202010421822.2A CN202010421822A CN111413786B CN 111413786 B CN111413786 B CN 111413786B CN 202010421822 A CN202010421822 A CN 202010421822A CN 111413786 B CN111413786 B CN 111413786B
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- 238000003384 imaging method Methods 0.000 title claims abstract description 18
- 230000003287 optical effect Effects 0.000 claims abstract description 13
- 230000005499 meniscus Effects 0.000 claims description 24
- 239000000463 material Substances 0.000 claims description 10
- ORUIBWPALBXDOA-UHFFFAOYSA-L magnesium fluoride Chemical compound [F-].[F-].[Mg+2] ORUIBWPALBXDOA-UHFFFAOYSA-L 0.000 abstract description 19
- 229910001635 magnesium fluoride Inorganic materials 0.000 abstract description 19
- 230000000694 effects Effects 0.000 abstract description 4
- 239000006185 dispersion Substances 0.000 abstract description 3
- 239000005304 optical glass Substances 0.000 description 16
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 7
- 239000005350 fused silica glass Substances 0.000 description 7
- 238000012634 optical imaging Methods 0.000 description 4
- 239000002131 composite material Substances 0.000 description 2
- 230000005540 biological transmission Effects 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000004927 fusion Effects 0.000 description 1
- 238000011835 investigation Methods 0.000 description 1
- 230000004297 night vision Effects 0.000 description 1
- 230000035515 penetration Effects 0.000 description 1
- 230000005855 radiation Effects 0.000 description 1
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B13/00—Optical objectives specially designed for the purposes specified below
- G02B13/001—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras
- G02B13/0015—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras characterised by the lens design
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B1/00—Optical elements characterised by the material of which they are made; Optical coatings for optical elements
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- 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
- G02B13/146—Optical objectives specially designed for the purposes specified below for use with infrared or ultraviolet radiation with corrections for use in multiple wavelength bands, such as infrared and visible light, e.g. FLIR systems
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- General Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Health & Medical Sciences (AREA)
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Abstract
The invention relates to a short wave infrared/visible light double-light imaging lens, which comprises at least two lens groups and a spectroscope which are sequentially arranged along an optical axis; each lens group comprises at least one lens with positive focal power and at least one lens with negative focal power; at least one lens with positive focal power in each lens group is made of magnesium fluoride. According to the invention, the special dispersion characteristic of magnesium fluoride is utilized, the high-image-quality short-wave infrared/visible light double-light imaging is realized, images of short-wave infrared and visible light wave bands are simultaneously obtained in a light splitting mode behind a lens, and the image information content and the observation effect under various scenes are improved.
Description
Technical Field
The invention belongs to the technical field of optical lenses, and relates to a double-light imaging lens which compositely images short wave infrared and visible light wave bands and shares an imaging light path for the two wave bands.
Background
The short wave infrared band image has the characteristics of low-light night vision, fog penetration, optical glass transmission and high identification degree, and can be used in multiple fields of military investigation, camouflage identification, material sorting and the like. Visible light and short wave infrared images are fused, and visible light image information suitable for human eyes to observe and object material information reflected by short wave infrared can be obtained.
Visible light and short wave infrared fused images can be obtained respectively by utilizing two separated visible light and short wave infrared lenses, but the optical axis directions of the two lenses need to be strictly adjusted in the double-lens mode, and the different observation distances can also generate variable parallax, so that the image fusion effect is influenced. By using the visible light and short wave infrared band common light path lens and performing light splitting detection at the rear end of the lens, strictly coaxial visible light and short wave infrared images can be obtained. However, since the dispersion characteristic of the optical glass in the short-wave infrared band is too different from the visible light band, the performance difference of the same lens in the two bands is often too large, and it is difficult to design a common lens for the two bands.
Disclosure of Invention
The invention aims to solve the technical problem of providing a short wave infrared/visible light double-light imaging lens which compositely images short wave infrared and visible light wave bands and shares an imaging light path for the two wave bands.
In order to solve the technical problem, the short-wave infrared/visible light double-light imaging lens comprises at least two lens groups and a spectroscope which are sequentially arranged along an optical axis; each lens group comprises at least one lens with positive focal power and at least one lens with negative focal power; at least one lens with positive focal power in each lens group is made of magnesium fluoride.
Further, the present invention includes a first lens, a second lens, a third lens, a fourth lens, and a fifth lens disposed along an optical axis; the first lens and the second lens form a first lens group, and the third lens, the fourth lens and the fifth lens form a second lens group; the first lens is a biconvex lens; the second lens is a biconcave lens; the third lens and the fourth lens are biconvex lenses; the fifth lens element is a plano-concave lens element with a concave object-side surface, or a meniscus lens element with a concave object-side surface and a convex image-side surface.
The first lens and the third lens are made of magnesium fluoride; the second lens, the fourth lens and the fifth lens are optical glass capable of working in visible light and short-wave infrared.
The first lens, the third lens and the fourth lens are made of magnesium fluoride; the second lens and the fifth lens are optical glass which can work in visible light and short wave infrared.
Furthermore, the invention comprises a first lens, a second lens, a third lens, a fourth lens and a fifth lens which are arranged along the optical axis; the first lens and the second lens form a first lens group, and the third lens, the fourth lens and the fifth lens form a second lens group; the first lens is a biconvex lens; the second lens is a biconcave lens; the third lens is a biconvex lens; the fourth lens is a meniscus lens with positive focal power, the object side surface of the fourth lens is a concave surface, and the image side surface of the fourth lens is a convex surface; the fifth lens is a meniscus lens with negative focal power, the object side surface of the fifth lens is a concave surface, and the image side surfaces of the fifth lens are convex surfaces.
The first lens and the third lens are made of magnesium fluoride; the second lens and the fourth lens are fused quartz; the fifth lens is optical glass which can work in visible light and short wave infrared.
The first lens, the third lens and the fourth lens are made of magnesium fluoride; the second lens material is fused quartz; the fifth lens is optical glass which can work in visible light and short wave infrared.
Furthermore, the invention comprises a first lens, a second lens, a third lens, a fourth lens and a fifth lens which are arranged along the optical axis; the first lens and the second lens form a first lens group, and the third lens, the fourth lens and the fifth lens form a second lens group; the first lens is a meniscus lens with negative focal power, the object side surface of the first lens is a convex surface, and the image side surface of the first lens is a concave surface; the second lens is a meniscus lens with positive focal power, the object side surface of the second lens is a convex surface, and the image side surface of the second lens is a concave surface; the third lens is a biconvex lens; the fourth lens is a meniscus lens with positive focal power, the object side surface of the fourth lens is a concave surface, and the image side surface of the fourth lens is a convex surface; the fifth lens element is a meniscus lens element with negative focal power, a concave object-side surface and a convex image-side surface.
The second lens and the third lens are made of magnesium fluoride, and the first lens, the fourth lens and the fifth lens are made of optical glass capable of working in visible light and short wave infrared.
The second lens and the third lens are made of magnesium fluoride, the first lens and the fourth lens are made of fused quartz, and the fifth lens is made of optical glass capable of working in visible light and short wave infrared.
In order to solve the problem that the imaging quality of short-wave infrared and visible light is difficult to be considered in the design of the traditional optical lens and the problem of imaging parallax in a double-lens composite system, the invention adopts a magnesium fluoride lens material, and realizes a novel common-path short-wave infrared and visible light composite imaging lens.
When the invention works, the radiation of the object in the short wave infrared band and the light band can be perfectly imaged through the lens, and the coaxial images of the short wave infrared band and the visible light band can be simultaneously obtained by receiving the images by the detectors of the respective bands after passing through the spectroscope.
Advantageous effects
According to the invention, the special dispersion characteristic of magnesium fluoride is utilized, the high-image-quality short-wave infrared/visible light double-light imaging is realized, images of short-wave infrared and visible light wave bands are simultaneously obtained in a light splitting mode behind a lens, and the image information content and the observation effect under various scenes are improved.
Drawings
The present invention will be described in further detail with reference to the accompanying drawings and specific embodiments.
Fig. 1 is a schematic structural view of embodiment 1 of the present invention.
Fig. 2 is a modulation transfer function curve of a short wave infrared band of embodiment 1 of the present invention.
Fig. 3 is a modulation transfer function curve of the visible light band of embodiment 1 of the present invention.
Fig. 4 is a schematic structural diagram of embodiment 2 of the present invention.
Fig. 5 is a modulation transfer function curve of a short wave infrared band of embodiment 2 of the present invention.
Fig. 6 is a modulation transfer function curve of the visible light band of embodiment 2 of the present invention.
Fig. 7 is a schematic structural view of embodiment 3 of the present invention.
Fig. 8 is a modulation transfer function curve of a short wave infrared band of embodiment 3 of the present invention.
Fig. 9 is a modulation transfer function curve of the visible light band of embodiment 3 of the present invention.
Fig. 10 is a schematic structural view of embodiment 4 of the present invention.
Fig. 11 is a modulation transfer function curve of a short wave infrared band of embodiment 4 of the present invention.
Fig. 12 is a modulation transfer function curve of the visible light band of embodiment 4 of the present invention.
In the figure, 1, a first lens, 2, a second lens, 3, a third lens, 4, a fourth lens, 5, a fifth lens, 6, a beam splitter, 7, a short-wave infrared image plane and 8, a visible light image plane are shown.
Detailed Description
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 drawings without creative efforts.
Example 1
As shown in fig. 1, the short-wave infrared/visible light dual-optical imaging lens of the invention includes a first lens 1, a second lens 2, a third lens 3, a fourth lens 4, a fifth lens 5, and a spectroscope 6; the first lens 1 is a biconvex lens with positive focal power, the object side surface and the image side surface of the first lens are convex surfaces, and the first lens is made of magnesium fluoride; the second lens 2 is a biconcave lens with negative focal power, the object side surface and the image side surface of the second lens are both concave surfaces, and the material is optical glass which can work in visible light and short wave infrared; the third lens 3 is a biconvex lens with positive focal power, the object side surface and the image side surface of the third lens are convex surfaces, and the third lens is made of magnesium fluoride; the fourth lens 4 is a biconvex lens, has positive focal power, and has convex object-side and image-side surfaces, and is made of optical glass capable of working in visible light and short-wave infrared; the fifth lens 5 is a plano-concave lens with negative focal power, the object side surface of the fifth lens is a concave surface, the image side surface of the fifth lens is a plane, and the fifth lens is made of optical glass capable of working in visible light and short wave infrared; the beam splitter 6 is inclined at 45 to the optical axis.
The wave bands selected by the system design of the embodiment are 460 nm-680 nm and 900 nm-1700 nm; the field angle of the system is +/-1.93 degrees, and the focal length is 120 mm. Specific parameters of each lens are shown in table 1. In the table, R represents a radius of curvature of a lens surface, t represents a thickness of a lens, and d represents an air space from a rear surface of the lens to a front surface of the next lens. The modulation transfer function curve of the embodiment in the short wave infrared band is shown in fig. 2, and the modulation transfer function curve in the visible light band is shown in fig. 3. As can be seen from fig. 2 and 3, the embodiment has better imaging quality in both the short wave infrared band and the visible light band full field of view.
TABLE 1
Example 2:
as shown in fig. 4, the short-wave infrared/visible light dual-optical imaging lens of the invention includes a first lens 1, a second lens 2, a third lens 3, a fourth lens 4, a fifth lens 5, and a beam splitter 6; the first lens 1 is a biconvex lens with positive focal power, the object side surface and the image side surface of the first lens are convex surfaces, and the first lens is made of magnesium fluoride; the second lens 2 is a biconcave lens with negative focal power, the object side surface and the image side surface of the second lens are both concave surfaces, and the second lens is made of fused quartz; the third lens 3 is a biconvex lens with positive focal power, the object side surface and the image side surface of the third lens are convex surfaces, and the third lens is made of magnesium fluoride; the fourth lens 4 is a meniscus lens with positive focal power, 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 fused quartz is selected as a material; the fifth lens 5 is a meniscus lens with negative focal power, the object side surface of the fifth lens is a concave surface, the image side surfaces of the fifth lens are convex surfaces, and the fifth lens is made of optical glass capable of working in visible light and short wave infrared; the beam splitter 6 is inclined at 45 to the optical axis.
The wave bands selected by the system design of the embodiment are 460 nm-680 nm and 900 nm-1700 nm; the field angle of the system is +/-1.93 degrees, and the focal length is 120 mm. Specific parameters of each lens are shown in table 2. In the table, R represents a radius of curvature of a lens surface, t represents a thickness of a lens, and d represents an air space from a rear surface of the lens to a front surface of the next lens. The modulation transfer function curve of the present embodiment in the short wave infrared band is shown in fig. 5, and the modulation transfer function curve in the visible light band is shown in fig. 6. As can be seen from fig. 5 and 6, the embodiment has better imaging quality in both the short wave infrared band and the visible light band full field of view.
TABLE 2
Example 3:
as shown in fig. 7, the short-wave infrared/visible light dual-optical imaging lens of the invention includes a first lens 1, a second lens 2, a third lens 3, a fourth lens 4, a fifth lens 5, and a beam splitter 6; the first lens 1 is a meniscus lens with negative focal power, 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 first lens is made of optical glass which can work in visible light and short wave infrared; the second lens 2 is a meniscus lens with positive focal power, the object side surface of the meniscus lens is a convex surface, the image side surface of the meniscus lens is a concave surface, and the material of the meniscus lens is magnesium fluoride; the third lens 3 is a biconvex lens with positive focal power, the object side surface and the image side surface of the third lens are convex surfaces, and the third lens is made of magnesium fluoride; the fourth lens 4 is a meniscus lens with positive focal power, 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 the fourth lens is made of optical glass which can work in visible light and short wave infrared; the fifth lens 5 is a meniscus lens with negative focal power, the object side surface of the fifth lens is a concave surface, the image side surface of the fifth lens is a convex surface, and the fifth lens is made of optical glass capable of working in visible light and short wave infrared; the beam splitter 6 is inclined at 45 to the optical axis.
The wave bands selected by the system design of the embodiment are 460 nm-680 nm and 900 nm-1700 nm; the field angle of the system is +/-1.93 degrees, and the focal length is 120 mm. Specific parameters of each lens are shown in table 3. In the table, R represents a radius of curvature of a lens surface, t represents a thickness of a lens, and d represents an air space from a rear surface of the lens to a front surface of the next lens. The modulation transfer function curve of the present embodiment in the short wave infrared band is shown in fig. 8, and the modulation transfer function curve in the visible light band is shown in fig. 9. As can be seen from fig. 8 and 9, the embodiment has better imaging quality in both the short-wave infrared band and the visible light band full-field.
TABLE 3
Example 4:
as shown in fig. 10, the short-wave infrared/visible light dual-optical imaging lens of the invention includes a first lens 1, a second lens 2, a third lens 3, a fourth lens 4, a fifth lens 5, and a beam splitter 6; the first lens 1 is a meniscus lens with negative focal power, 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 fused quartz is selected as a material; the second lens 2 is a meniscus lens with positive focal power, the object side surface of the meniscus lens is a convex surface, the image side surface of the meniscus lens is a concave surface, and the material of the meniscus lens is magnesium fluoride; the third lens 3 is a biconvex lens with positive focal power, the object side surface and the image side surface of the third lens are convex surfaces, and the third lens is made of magnesium fluoride; the fourth lens 4 is a meniscus lens with positive focal power, 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 the fourth lens is made of fused quartz; the fifth lens 5 is a meniscus lens with negative focal power, the object side surface of the fifth lens is a concave surface, the image side surface of the fifth lens is a convex surface, and the fifth lens is made of optical glass capable of working in visible light and short wave infrared; the beam splitter 6 is inclined at 45 to the optical axis.
The wave bands selected by the system design of the embodiment are 460 nm-680 nm and 900 nm-1700 nm; the field angle of the system is +/-1.93 degrees, and the focal length is 120 mm. Specific parameters of each lens are shown in table 3. In the table, R represents a radius of curvature of a lens surface, t represents a thickness of a lens, and d represents an air space from a rear surface of the lens to a front surface of the next lens. The modulation transfer function curve of the present embodiment in the short wave infrared band is shown in fig. 11, and the modulation transfer function curve in the visible light band is shown in fig. 12. As can be seen from fig. 11 and 12, the embodiment has better imaging quality in both the short-wave infrared band and the visible light band full-field.
TABLE 4
The present invention is not limited to the above embodiments, and a group of lenses or three groups of lenses may be used according to the different focal lengths of the systems.
Claims (1)
1. A short-wave infrared/visible light double-light imaging lens is characterized by comprising a first lens group and a second lens group, wherein the first lens group and the second lens group are formed by a first lens (1) and a second lens (2) which are sequentially arranged along an optical axis, the second lens group is formed by a third lens (3), a fourth lens (4) and a fifth lens (5), and a spectroscope (6); the first lens (1) is a biconvex lens; the second lens (2) is a biconcave lens; the third lens (3) and the fourth lens (4) are double-convex lenses; the fifth lens (5) adopts a plano-concave lens with a concave object side surface or a meniscus lens with a concave object side surface and a convex image side surface; the parameters and materials of each lens are shown in table 1, where R represents the radius of curvature of the lens surface, t represents the thickness of the lens, and d represents the air space from the rear surface of the lens to the front surface of the next lens;
TABLE 1
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| CN202010421822.2A CN111413786B (en) | 2020-05-18 | 2020-05-18 | Short wave infrared/visible light double-light imaging lens |
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| CN112162392B (en) * | 2020-09-25 | 2021-07-27 | 中国科学院西安光学精密机械研究所 | Short wave infrared two-gear zoom optical lens |
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| JPH095805A (en) * | 1995-06-15 | 1997-01-10 | Sony Corp | Condenser lens |
| CN207586350U (en) * | 2017-03-22 | 2018-07-06 | 三峡大学 | A kind of insulator ultraviolet monitoring system containing optical zoom apparatus |
| CN109407273B (en) * | 2018-11-14 | 2021-01-01 | 中国航空工业集团公司洛阳电光设备研究所 | Visible light, medium wave infrared and long wave infrared common optical path optical system |
| CN109960017A (en) * | 2019-04-18 | 2019-07-02 | 福建福光天瞳光学有限公司 | The small-sized day and night confocal vehicle-mounted optical system of one kind and its working method |
| CN210465835U (en) * | 2019-10-10 | 2020-05-05 | 保胜光学股份有限公司 | Large-aperture long-wavelength infrared thermal imaging lens |
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