CN112230406B - Near-infrared high-definition zooming optical system with strong fog penetration capability - Google Patents
Near-infrared high-definition zooming optical system with strong fog penetration capability Download PDFInfo
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- CN112230406B CN112230406B CN202011217864.0A CN202011217864A CN112230406B CN 112230406 B CN112230406 B CN 112230406B CN 202011217864 A CN202011217864 A CN 202011217864A CN 112230406 B CN112230406 B CN 112230406B
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- 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
- G02B15/16—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 with interdependent non-linearly related movements between one lens or lens group, and another lens or lens group
- G02B15/163—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 with interdependent non-linearly related movements between one lens or lens group, and another lens or lens group having a first movable lens or lens group and a second movable lens or lens group, both in front of a fixed lens or lens group
- G02B15/167—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 with interdependent non-linearly related movements between one lens or lens group, and another lens or lens group having a first movable lens or lens group and a second movable lens or lens group, both in front of a fixed lens or lens group having an additional fixed front lens or group of lenses
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Abstract
The invention relates to a near-infrared high-definition zooming optical system with strong fog penetration capability, which sequentially comprises a front fixed group, a zoom group, a compensation group, a diaphragm, a rear fixed group and a color filter from an object space to an image space, wherein the front fixed group and the compensation group use ultra-low dispersion materials, the secondary spectral aberration of the optical system is greatly reduced, and high-definition imaging of a 650-1000 nm near-infrared broadband is realized. The optical system has large relative aperture and high resolution, can be switched by the color filter to be used under the condition of 1064nm laser illumination, enhances the fog penetration capability, and has stronger fog penetration imaging capability in severe weather environment compared with the common near-infrared optical system.
Description
The technical field is as follows:
the invention relates to a near-infrared high-definition zooming optical system with strong fog penetration capability, belonging to the technical field of photoelectricity.
Background art:
small particles such as smoke dust, fog and the like in the air have a strong scattering effect on visible light, so that a common visible light lens cannot detect a target behind the smoke dust and the fog; the longer the wavelength is, the stronger the penetration ability is, i.e. the light waves easily bypass the obstacle, so that the influence of aerosol on light waves with longer wavelength such as near infrared and the like is less, the light waves can penetrate smoke dust and fog, accurate focusing is realized, and the lens has the function of fog penetration, and the detection distance is increased.
At present, the main working waveband of a common fog-penetrating lens is generally 750 nm-900 nm, the waveband is narrow, and wide spectrum information cannot be obtained; for an optical system with a wide spectrum of 400nm-1000nm and a full-wave band high definition, the design is limited by secondary spectrum aberration, the image quality of visible light and near-infrared wave bands cannot be fully considered, and the common lens mainly adjusts the visible light, so that high-definition imaging cannot be really realized during near-infrared fog penetration work.
In some special environments, a 1064nm laser light source is required to be added to the fog-penetrating lens for auxiliary illumination, and a real high-definition imaging lens matched with the detector with strong spectral response capability of the current near-infrared band and partial short-wave infrared (900 nm-1100 nm) band is urgently needed.
The invention content is as follows:
the invention provides a near-infrared high-definition zooming optical system with strong fog transmission capability, which has large relative aperture, can perform high-definition imaging in a near-infrared broadband of 650 nm-1000nm, can work under the condition of 1064nm laser illumination through color filter switching, and has stronger fog transmission capability.
The specific technical scheme of the invention is as follows:
the invention discloses a near-infrared high-definition zooming optical system with strong fog penetration capability, which is characterized in that: a front fixed group, a zoom group, a compensation group, a diaphragm, a rear fixed group and a color filter are sequentially arranged from an object space to an image space; the front fixing group comprises a first positive crescent lens, a second positive crescent lens and a first gluing group formed by tightly connecting a first negative crescent lens and a third positive crescent lens; the zoom group comprises a second adhesive group and a third biconcave lens, wherein the second adhesive group consists of a first biconcave lens, a first biconvex lens and a second biconcave lens in a sealing connection manner; the compensation group comprises a second biconvex lens, a third bonding group and a fourth positive crescent lens, wherein the third bonding group is formed by closely connecting a second negative crescent lens and a third biconvex lens; the rear fixing group comprises a fourth biconcave lens, a fifth orthodontic lens, a fourth bonding group consisting of the fourth biconcave lens and the fifth biconcave lens in a sealing way, and a fifth biconvex lens.
Furthermore, the zooming group and the compensation group are movable lens groups, in the zooming process, the air interval change range of the front fixed group and the zooming group is 1.53 mm-33.32 mm, the air interval change range of the zooming group and the compensation group is 1.31 mm-53.53 mm, and the air interval change range of the compensation group and the diaphragm is 0.15 mm-20.53 mm.
Further, in the front fixing group, the air space between the first orthodontic lens and the second orthodontic lens is 0.15mm, and the air space between the second orthodontic lens and the first cemented group is 0.40 mm; in the zoom group, the air space between the second gluing group and the third biconcave lens is 3.01 mm; in the compensation group, the air space between the second biconvex lens and the third adhesive group is 0.15mm, and the air space between the third adhesive group and the fourth orthodontic lens is 0.15 mm; in the rear fixing group, the air space between the fourth biconcave lens E1 and the fifth orthodontic lens is 0.15mm, the air space between the fifth orthodontic lens and the fourth cemented group is 14.25mm, and the air space between the fourth cemented group and the fifth biconvex lens E5 is 8.68 mm.
Furthermore, the optical system can realize high-definition imaging within the wave band range of 650 nm-1000nm, and meanwhile, the optical system can be used under the condition of 1064nm laser illumination by switching the color filter, so that the fog penetration capability of the optical system is enhanced.
Furthermore, the front fixed group first orthodontic lens adopts a high-refractive-index material ZF52 so as to reduce the high-level spherical aberration of the system and improve the resolution.
Furthermore, the front fixed group uses an ultra-low dispersion material, and the lens material of the first cementing group meets the condition that the refractive index difference is more than 0.4, thereby effectively correcting the secondary spectral aberration and the high-order spherical aberration of the optical system in the long-focus state and improving the long-focus imaging quality.
Furthermore, a second cemented lens group in the zoom group is a three cemented lens group, the first biconvex lens in the middle of the cemented lens group is made of E-FDS3 material, the first biconvex lens and the first biconcave lens meet the requirement that the difference of the refractive indexes of the materials is greater than 0.3, and the first biconvex lens and the second biconcave lens meet the requirement that the difference of the refractive indexes of the materials is greater than 0.2, so that the correction of the chromatic aberration of magnification in a short-focus state is facilitated, and the short-focus imaging quality is improved.
Furthermore, the compensation group uses an ultra-low dispersion material, the third biconvex lens uses an E-FDS3 material, and the third cemented group lens material meets the condition that the refractive index difference is greater than 0.5, so that the correction of the secondary spectrum and the spherical aberration in a short-focus state is realized, and the short-focus resolution is improved.
The optical system realizes the following main optical indexes:
focal length: 20 mm-250 mm; relative pore size: 1/4, respectively; the working wave band is as follows: 650 nm-1000nm, and high-definition imaging of 1064nm laser wave band can be realized simultaneously by switching color filters; total optical length: less than or equal to 145 mm; resolution ratio: 1920 x 1080, 3.45 μm pixel, adapted to high definition detector.
Each lens of the optical system meets the parameter requirements shown in the following table;
lens parameter table
The sizes of the optical system in the long and short focal states are respectively shown in the following table:
variable interval table
| L1 | L2 | L3 | |
| Short coke | 1.53 | 53.53 | 0.15 |
| Long coke | 33.32 | 1.31 | 20.53 |
The invention has the beneficial effects that: the applicable wave band is 650 nm-1000nm wider than the common near infrared fog-penetrating wave band, more target information can be obtained, and the device can be used under the condition of 1064nm laser illumination and has strong fog-penetrating capability; the relative aperture is big, and imaging resolution is high, can with near-infrared high definition detector adaptation.
Drawings
FIG. 1 is a diagram of an optical system according to an embodiment of the present invention;
FIG. 2 is a graph of short-focus near-infrared MTF curves for an embodiment of the present invention;
FIG. 3 is a graph of short focus 1064nmMTF according to an embodiment of the present invention;
FIG. 4 is a graph of a tele near-infrared MTF curve according to an embodiment of the present invention;
FIG. 5 is a graph of the tele 1064nmMTF of an embodiment of the present invention.
The specific implementation mode is as follows:
referring to fig. 1, the near-infrared high-definition zoom optical system with strong fog penetration capability of the present invention is sequentially provided with a front fixed group a, a zoom group B, a compensation group C, a diaphragm D, a rear fixed group E and a color filter F from an object space to an image space; wherein, the front fixed group A comprises a first positive crescent lens A1, a second positive crescent lens A2, and a first adhesive group formed by tightly connecting a first negative crescent lens A3 and a third positive crescent lens A4; the variable power group B comprises a second adhesive group consisting of a first biconcave lens B1, a first biconvex lens B2 and a second biconcave lens B3 which are closely connected, and a third biconcave lens B4; the compensation group C comprises a second biconvex lens C1, a third adhesive group consisting of a second negative crescent lens C2 and a third biconvex lens C3 in a sealing manner, and a fourth positive crescent lens C4; the rear fixed group E includes a fourth biconcave lens E1, a fifth orthodontic lens E2, a fourth cemented group composed of the fourth biconvex lens E3 and the fifth biconcave lens E4 by close contact, and a fifth biconvex lens E5.
The zoom group and the compensation group are movable mirror groups, in the zooming process, the air interval change range of the front fixed group and the zoom group is 1.53 mm-33.32 mm, the air interval change range of the zoom group and the compensation group is 1.31 mm-53.53 mm, and the air interval change range of the compensation group and the diaphragm is 0.15 mm-20.53 mm.
In the front fixed group, the air space between the first orthodontic lens A1 and the second orthodontic lens A2 is 0.15mm, and the air space between the second orthodontic lens A2 and the first cemented group is 0.40 mm; in the zoom group, the air space between the second gluing group and the third double-concave lens B4 is 3.01 mm; in the compensation group, the air space between the second biconvex lens C1 and the third cemented group is 0.15mm, and the air space between the third cemented group and the fourth orthodontic lens C4 is 0.15 mm; in the rear fixed group, an air space between the fourth biconcave lens E1 and the fifth orthodontic lens E2 was 0.15mm, an air space between the fifth orthodontic lens E2 and the fourth cemented group was 14.25mm, and an air space between the fourth cemented group and the fifth biconvex lens E5 was 8.68 mm.
Each lens of the near-infrared high-definition zooming optical system with strong fog penetration capability needs to meet the parameter requirements shown in table 1.
TABLE 1 lens parameter table
In table 1, L1, L2, and L3 are variable distances, and the sizes of the optical systems in the short focal state are shown in table 2:
TABLE 2 variable Interval Table
| L1 | L2 | L3 | |
| Short coke | 1.53 | 53.53 | 0.15 |
| Long coke | 33.32 | 1.31 | 20.53 |
The near-infrared high-definition zooming optical system with strong fog penetration capability realizes high-definition imaging in a wave band range of 650 nm-1000nm, and meanwhile, the optical system can be used under a 1064nm laser illumination condition by switching the color filter F, so that the fog penetration capability of the optical system is enhanced. Fig. 2 and 4 show MTF curves of the long and short foci of the optical system in the near infrared band, and fig. 3 and 5 show MTF curves of the long and short foci of the optical system in the 1064nm band, which has the characteristic of high resolution.
A front fixed group of first orthodontic lens A1 of the near-infrared high-definition zoom optical system with strong fog penetration capability adopts a high-refractive-index material ZF52, so that the high-level spherical aberration of the system is reduced, and the resolution is improved.
The front fixed group uses an ultra-low dispersion material, and the first cemented group lens material meets the condition that the refractive index difference is more than 0.4, so that the secondary spectral aberration of the optical system in a long-focus state is effectively corrected.
The second cemented lens group in the zoom group is a triple cemented lens group, the first biconvex lens B2 in the middle of the cemented lens group is made of E-FDS3 material, the first biconvex lens B2 and the first biconcave lens B1 meet the condition that the material refractive index difference is larger than 0.3, and the first biconvex lens B2 and the second biconcave lens B3 meet the condition that the material refractive index difference is larger than 0.2, so that the correction of chromatic aberration of magnification in a short-focus state is facilitated.
The compensation group is made of an ultra-low dispersion material, the third biconvex lens C3 is made of an E-FDS3 material, and meanwhile, the third cemented group lens material meets the condition that the difference of the refractive index is larger than 0.5, the correction of a secondary spectrum and the spherical aberration in a short-focus state is realized, and the short-focus resolution is improved.
The near-infrared high-definition zooming optical system with strong fog penetration capability has the following main optical indexes:
focal length: 20 mm-250 mm;
relative pore diameter: 1/4, respectively;
the working wave band is as follows: 650 nm-1000nm, and high-definition imaging of 1064nm laser wave band can be realized simultaneously by switching color filters;
total optical length: less than or equal to 145 mm;
resolution ratio: 1920 x 1080, 3.45 μm pixel, adapted to high definition detector.
The optical system has large relative aperture and high resolution, can be switched by the color filter to be used under the condition of 1064nm laser illumination, enhances the fog-penetrating capacity, and has stronger fog-penetrating imaging capacity than a common near-infrared optical system in a severe weather environment.
The above description is only a preferred embodiment of the present invention, and all equivalent changes and modifications made in accordance with the claims of the present invention should be covered by the present invention.
Claims (5)
1. The utility model provides a near-infrared high definition optical system that zooms with strong fog ability that passes through which characterized in that: a front fixed group (A), a zooming group (B), a compensation group (C), a diaphragm (D), a rear fixed group (E) and a color filter (F) are sequentially arranged from an object space to an image space; wherein, the front fixed group (A) is composed of a first adhesive combination formed by tightly connecting a first positive meniscus lens (A1), a second positive meniscus lens (A2), a first negative meniscus lens (A3) and a third positive meniscus lens (A4); the zoom group (B) is composed of a second adhesive group and a third double-concave lens (B4), wherein the second adhesive group is formed by tightly connecting a first double-concave lens (B1), a first double-convex lens (B2) and a second double-concave lens (B3); the compensation group (C) is composed of a second biconvex lens (C1), a third bonding group formed by closely connecting a second negative crescent lens (C2) and a third biconvex lens (C3), and a fourth positive crescent lens (C4); the rear fixed group (E) is composed of a fourth biconcave lens (E1), a fifth orthodontic lens (E2), a fourth adhesive group consisting of a fourth biconvex lens (E3) and a fifth biconcave lens (E4) which are tightly connected, and a fifth biconvex lens (E5); the zoom group and the compensation group are movable lens groups, in the zooming process, the air interval change range of the front fixed group and the zoom group is 1.53 mm-33.32 mm, the air interval change range of the zoom group and the compensation group is 1.31 mm-53.53 mm, and the air interval change range of the compensation group and the diaphragm is 0.15 mm-20.53 mm; in the front fixed group, the air space between the first orthodontic lens (A1) and the second orthodontic lens (A2) is 0.15mm, and the air space between the second orthodontic lens (A2) and the first cemented group is 0.40 mm; in the zoom group, the air space between the second gluing group and the third double-concave lens (B4) is 3.01 mm; in the compensation group, the air space between the second biconvex lens (C1) and the third cemented group is 0.15mm, and the air space between the third cemented group and the fourth orthodontic lens (C4) is 0.15 mm; in the rear fixed group, the air space between the fourth biconcave lens (E1) and the fifth orthodontic lens (E2) was 0.15mm, the air space between the fifth orthodontic lens (E2) and the fourth cemented group was 14.25mm, and the air space between the fourth cemented group and the fifth biconvex lens (E5) was 8.68 mm; the optical system performs high-definition imaging within a wave band range of 650 nm-1000nm, and meanwhile, the fog penetration capacity of the optical system is enhanced by switching a color filter to use under a 1064nm laser illumination condition; resolution ratio: 1920 x 1080, 3.45 μm pixel, adapted to high definition detector.
2. The near-infrared high-definition zooming optical system with strong fog penetration capability of claim 1, wherein: the front fixed group first orthodontic lens (A1) adopts a high-refractive-index material ZF52 so as to reduce the high-level spherical aberration of the system and improve the resolution.
3. The near-infrared high-definition zooming optical system with strong fog penetration capability of claim 1, wherein: the second cemented lens group in the zoom group is a triple cemented lens group, the first biconvex lens (B2) in the middle of the cemented lens group is made of E-FDS3 material, the first biconvex lens (B2) and the first biconcave lens (B1) meet the condition that the material refractive index difference is larger than 0.3, and the first biconvex lens (B2) and the second biconcave lens (B3) meet the condition that the material refractive index difference is larger than 0.2, so that the correction of the chromatic aberration of magnification in a short-focus state is facilitated, and the short-focus imaging quality is improved.
4. The near-infrared high-definition zooming optical system with strong fog penetration capability of claim 1, wherein: the optical system realizes the following main optical indexes:
focal length: 20 mm-250 mm; relative pore diameter: 1/4, respectively; the working wave band is as follows: 650 nm-1000nm, and high-definition imaging of 1064nm laser wave band can be realized simultaneously by switching color filters; total optical length: less than or equal to 145 mm.
5. The near-infrared high-definition zooming optical system with strong fog penetration capability of claim 1, wherein: each lens of the optical system meets the parameter requirements shown in the following table;
lens parameter table
The variable interval sizes in the long and short focal states of the optical system are respectively shown in the following table:
variable interval table
。
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| Publication number | Priority date | Publication date | Assignee | Title |
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| KR102004988B1 (en) * | 2012-12-21 | 2019-07-29 | 삼성전자주식회사 | Zoom lens and photographing apparatus having the same |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| JPH07140386A (en) * | 1993-11-12 | 1995-06-02 | Asahi Optical Co Ltd | Inner focusing system telephoto zoom lens |
| JP2002169091A (en) * | 2000-11-30 | 2002-06-14 | Canon Inc | Zoom lens and photographing system |
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| JP2014219616A (en) * | 2013-05-10 | 2014-11-20 | キヤノン株式会社 | Zoom lens and imaging apparatus including the same |
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