CN115421286A - Compact wide-band continuous zooming optical system - Google Patents
Compact wide-band continuous zooming optical system Download PDFInfo
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- CN115421286A CN115421286A CN202210898933.1A CN202210898933A CN115421286A CN 115421286 A CN115421286 A CN 115421286A CN 202210898933 A CN202210898933 A CN 202210898933A CN 115421286 A CN115421286 A CN 115421286A
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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
- 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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- 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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Abstract
The invention discloses a compact wide-waveband continuous zooming optical system which sequentially comprises an objective lens group, a zoom lens group, a compensation lens group and a fixed lens group from the object side to the image side, wherein the zoom lens group and the compensation lens group can move along the optical axis direction. According to the compact type wide-waveband continuous zooming optical system, the design of a common optical path from visible light to short-wave infrared is realized by adding the working waveband of the visible light continuous zooming lens, the switchable optical filter is arranged in the optical path, wide-waveband and multi-spectrum detection is realized by focusing the working waveband of the optical filter, and the detection capability of the optical system is improved.
Description
Technical Field
The invention relates to the field of airborne photoelectric detection systems, in particular to a compact wide-band continuous zooming optical system.
Background
The continuous zooming visible light is the most mainly used waveband of the airborne photoelectric system, high-resolution imaging of a target can be realized, the imaging effect is close to that of human vision, but the visible light waveband is greatly influenced by factors such as weather. The short wave infrared fog penetration effect is good, the defect of visible light can be made up, and the adaptability of an optical system is improved.
The design widens the continuous zooming working waveband of visible light, covers short wave infrared, realizes that two detection wavebands share one optical system, and greatly reduces the space volume required by the multiband detection optical system.
Disclosure of Invention
Technical problem to be solved
It is an object of the present invention to overcome the above-mentioned disadvantages and to provide a compact wide-band continuous zoom optical system.
(II) technical scheme
To achieve the above object, a compact wide-band continuous zoom optical system of the present invention comprises, in order from an object plane side to an image plane side, an objective lens group, a variable power lens group, a compensation lens group, and a fixed lens group, the variable power lens group and the compensation lens group being movable in an optical axis direction, wherein,
the objective lens group comprises from the object surface side to the image surface side in sequence:
a first objective lens having a convex object side surface and a concave image side surface;
the second objective lens has a convex object side surface and a concave image side surface;
a third objective lens with a convex object side surface and a concave image side surface;
a fourth objective lens, which has a convex object side surface and a concave image side surface;
the variable power lens group comprises the following components in sequence from an object plane side to an image plane side:
the first zoom lens has a convex object side surface and a concave image side surface;
a second zoom lens;
the compensation lens group comprises the following components in sequence from the object surface side to the image surface side:
the object side and the image side of the first compensation mirror are convex surfaces;
the second compensation mirror has a convex object side surface and a concave image side surface;
the object side and the image side of the third compensation mirror are convex surfaces;
the fixed lens group includes in order from an object plane side to an image plane side:
the object side and the image side of the first fixed mirror are both concave surfaces;
a second fixed mirror having a convex object side surface and a concave image side surface;
an optical filter is further arranged on the image side of the second fixed mirror, and a third fixed mirror is arranged between the optical filter and the image surface.
Further, the second zoom lens is a cemented lens, and both the object side and the image side of the cemented lens are concave surfaces.
Further, the filters are switchable filters, and the switchable filters are four groups of filters, including: a transmission filter with a wide wave band of 0.45-1.7 μm, a color filter with a wide wave band of 0.45-0.65 μm, a near infrared filter with a wide wave band of 0.65-0.9 μm, and a short wave infrared filter with a wide wave band of 0.9-1.7 μm.
Further, the focal length range of the optical system is as follows: EFL is more than or equal to 19mm and less than or equal to 200mm.
Furthermore, the working frequency range of the optical system is 0.45-1.7 μm, and the image height is 7mm.
Further, an air interval between the fourth objective lens and the first zoom lens on the optical axis is L1, and an air interval between the second zoom lens and the first compensation lens on the optical axis is L2, which satisfies: L1/L2<11.
Further, the air space between the second zoom lens and the first compensation lens on the optical axis is L2, and the air space between the third compensation lens and the first fixed lens on the optical axis is L3, which satisfies the following requirements: L2/L3<53.
Further, the curvature radius R1 of the object side surface of the first objective lens, the curvature radius R2 of the second object mirror side surface, the curvature radius R3 of the object side surface of the third objective lens, and the curvature radius R4 of the image side surface of the fourth objective lens satisfy: (R1 + R2)/(R1-R2) <3.5, and R1/R2> R3/R4.
(III) advantageous effects
Compared with the prior art, the technical scheme of the invention has the following advantages: according to the compact type wide-waveband continuous zooming optical system, the working waveband of the visible light continuous zooming lens is increased, the common light path design from visible light to short wave infrared is realized, the switchable optical filter is arranged in the light path, the wide-waveband and multi-spectrum detection is realized by focusing the working waveband of the optical filter, and the detection capability of the optical system is improved.
Drawings
FIG. 1 is a schematic view of a broadband continuous zoom small field of view of the present invention;
fig. 2 is a broad band continuous zoom large field of view optical path diagram of the present invention.
Detailed Description
In order to make the technical solutions better understood by those skilled in the art, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are only partial embodiments of the present application, but not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.
It should be noted that the terms "first," "second," and the like in the description and claims of this application and in the drawings described above are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used is interchangeable under appropriate circumstances such that the embodiments of the application described herein are capable of operation in sequences other than those illustrated or described herein. Moreover, the terms "comprises," "comprising," and "having," and any variations thereof, are intended to cover a non-exclusive inclusion, such that a process, method, system, article, or apparatus that comprises a list of steps or elements is not necessarily limited to those steps or elements expressly listed, but may include other steps or elements not expressly listed or inherent to such process, method, article, or apparatus.
The invention discloses a compact wide-band continuous zooming optical system, which sequentially comprises an objective lens group, a zoom lens group, a compensation lens group and a fixed lens group from an object surface side to an image surface side, wherein the zoom lens group and the compensation lens group can move along the optical axis direction, and the objective lens group sequentially comprises from the object surface side to the image surface side: a first objective lens 1 having a convex object side surface and a concave image side surface; a second objective lens 2 having a convex object side surface and a concave image side surface; a third objective lens 3 having a convex object-side surface and a concave image-side surface; a fourth objective lens 4 having a convex object side and a concave image side; the variable power lens group comprises the following components in sequence from an object plane side to an image plane side: a first zoom lens 5 having a convex object side surface and a concave image side surface; a second zoom lens 6; the compensation lens group comprises the following components in sequence from the object surface side to the image surface side: a first compensation mirror 7, both of which have convex object and image sides; a second compensation mirror 8 having a convex object-side surface and a concave image-side surface; a third compensation mirror 9, both of which have convex object and image sides; the fixed lens group sequentially includes from an object plane side to an image plane side: a first fixed mirror 10 having concave surfaces on both an object side and an image side; a second fixed mirror 11 having a convex object-side surface and a concave image-side surface; an optical filter 12 is further arranged on the image side of the second fixed mirror 11, and a third fixed mirror 13 is arranged between the optical filter 12 and the image plane.
The second zoom lens 6 is a cemented lens, both the object side and the image side of the cemented lens are concave surfaces, the cemented lens can effectively correct chromatic aberration, meanwhile, the lens volume is reduced, and the double-concave surface design can enable light rays to diverge, so that the focal length is lengthened, and the zoom ratio is increased.
The filters 12 are switchable filters, which are four sets of filters, including: a transmission filter with a wide wave band of 0.45-1.7 μm, a color filter with a wide wave band of 0.45-0.65 μm, a near infrared filter with a wide wave band of 0.65-0.9 μm, and a short wave infrared filter with a wide wave band of 0.9-1.7 μm. The working wave band covers visible light to short wave infrared, a switchable optical filter is arranged in a light path, wide wave band and multispectral detection is realized by focusing the working wave band of the optical filter, and the detection capability of the optical system is improved.
The air interval between the fourth objective lens 4 and the first zoom lens 5 on the optical axis is L1, and the air interval between the second zoom lens 6 and the first compensation lens 7 on the optical axis is L2, so that the following requirements are met: L1/L2<11. The air space on the optical axis between the second zoom lens 6 and the first compensation lens 7 is L2, and the air space on the optical axis between the third compensation lens 9 and the first fixed lens 10 is L3, so that the following requirements are met: L2/L3<53. L1, L2 and L3 meet the conditions, and the requirement of adjusting the focal length by more than 10 times is met.
The curvature radius R1 of the object side surface of the first objective lens 1, the curvature radius R2 of the image side surface of the second objective lens 2, the curvature radius R3 of the object side surface of the third objective lens 3 and the curvature radius R4 of the image side surface of the fourth objective lens 4 meet the following requirements: (R1 + R2)/(R1-R2) <3.5, the curvature of the object side of the first objective lens 1 is larger than that of the image side, which is beneficial to increasing the brightness, meanwhile, the larger curvature radius effectively reduces the phase difference, and R1/R2> R3/R4 is beneficial to converging light and is convenient for realizing dynamic adjustment of the follow-up zoom lens.
Specific parameters for each lens in the optical system of the present invention are shown in Table 1
The optical system formed by the lens group achieves the following optical indexes:
focal length: fmin =19mm, fmax =200mm;
the optical F number is 6;
can realize the switching observation of broadband 0.45-1.7 μm, color 0.45-0.65 μm, near infrared 0.65-0.9 μm and short wave infrared 0.9-1.7 μm.
According to the compact type wide-waveband continuous zooming optical system, the whole optical path is in a continuous zooming design, the design of a common optical path from visible light to short-wave infrared is realized by adding the working waveband of the visible light continuous zooming lens, the switchable optical filter is arranged in the optical path, the wide-waveband and multi-spectral detection is realized by focusing the working waveband of the optical filter, the detection capability of the optical system is improved, and the requirements of large-field observation and small-field detection are met.
In summary, the above embodiments are not intended to be limiting embodiments of the present invention, and modifications and equivalent variations made by those skilled in the art based on the spirit of the present invention are within the technical scope of the present invention.
Claims (8)
1. A compact wide-band continuous zoom optical system, characterized by: the zoom lens set and the compensation lens set can move along the direction of an optical axis, wherein the zoom lens set and the compensation lens set are sequentially arranged from the object side to the image surface side
The objective lens group comprises from the object surface side to the image surface side in sequence:
a first objective lens having a convex object side surface and a concave image side surface;
the second objective lens has a convex object side surface and a concave image side surface;
a third objective lens with a convex object side surface and a concave image side surface;
a fourth objective lens, which has a convex object side surface and a concave image side surface;
the variable power lens group comprises the following components in sequence from an object plane side to an image plane side:
the first zoom lens has a convex object side surface and a concave image side surface;
a second zoom lens;
the compensation lens group comprises the following components in sequence from the object surface side to the image surface side:
the object side and the image side of the first compensation mirror are convex surfaces;
the second compensation mirror has a convex object side surface and a concave image side surface;
the object side and the image side of the third compensation mirror are convex surfaces;
the fixed lens group sequentially includes from an object plane side to an image plane side:
the object side and the image side of the first fixed mirror are both concave surfaces;
a second fixed mirror having a convex object side surface and a concave image side surface;
an optical filter is further arranged on the image side of the second fixed mirror, and a third fixed mirror is arranged between the optical filter and the image surface.
2. A compact wide band continuous zoom optical system according to claim 1, wherein: the second zoom lens is a cemented lens, and both the object side and the image side of the second zoom lens are concave surfaces.
3. A compact wide band continuous zoom optical system according to claim 1, wherein: the optical filter is a switchable optical filter, the switchable optical filter is four groups of optical filters, and the switchable optical filter comprises: a transmission filter with a wide wave band of 0.45-1.7 μm, a color filter with a wide wave band of 0.45-0.65 μm, a near infrared filter with a wide wave band of 0.65-0.9 μm, and a short wave infrared filter with a wide wave band of 0.9-1.7 μm.
4. A compact wide band continuous zoom optical system according to claim 1, wherein: the focal length range of the optical system is as follows: EFL is more than or equal to 19mm and less than or equal to 200mm.
5. A compact wide band continuous zoom optical system according to claim 1, wherein: the working frequency band of the optical system is 0.45-1.7 μm, and the image height is 7mm.
6. A compact wide band continuous zoom optical system according to claim 1, wherein: the air space between the fourth objective lens and the first zoom lens on the optical axis is L1, and the air space between the second zoom lens and the first compensation lens on the optical axis is L2, so that the following requirements are met: L1/L2<11.
7. A compact wide band continuous zoom optical system according to claim 1, wherein: the air interval of the second zoom lens and the first compensation lens on the optical axis is L2, and the air interval of the third compensation lens and the first fixed lens on the optical axis is L3, so that the requirements on the following conditions are met: L2/L3<53.
8. A compact wide band continuous zoom optical system according to claim 1, wherein: the curvature radius R1 of the object side surface of the first objective lens, the curvature radius R2 of the second object mirror side surface, the curvature radius R3 of the object side surface of the third objective lens and the curvature radius R4 of the image side surface of the fourth objective lens meet the following requirements: (R1 + R2)/(R1-R2) <3.5, and R1/R2> R3/R4.
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| CN202210898933.1A CN115421286B (en) | 2022-07-28 | 2022-07-28 | Compact broadband continuous zoom optical system |
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| CN202210898933.1A CN115421286B (en) | 2022-07-28 | 2022-07-28 | Compact broadband continuous zoom optical system |
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2007219040A (en) * | 2006-02-15 | 2007-08-30 | Konica Minolta Opto Inc | Variable power optical system |
| JP2011123351A (en) * | 2009-12-11 | 2011-06-23 | Konica Minolta Opto Inc | Zoom lens |
| CN103135209A (en) * | 2011-12-05 | 2013-06-05 | 三星泰科威株式会社 | Zoom lens system and photographing apparatus |
| CN107065154A (en) * | 2017-06-08 | 2017-08-18 | 西安中科飞图光电科技有限公司 | Compact continuous zooming optical system |
| CN114355590A (en) * | 2021-12-29 | 2022-04-15 | 福建福光股份有限公司 | Continuous zooming camera lens |
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- 2022-07-28 CN CN202210898933.1A patent/CN115421286B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2007219040A (en) * | 2006-02-15 | 2007-08-30 | Konica Minolta Opto Inc | Variable power optical system |
| JP2011123351A (en) * | 2009-12-11 | 2011-06-23 | Konica Minolta Opto Inc | Zoom lens |
| CN103135209A (en) * | 2011-12-05 | 2013-06-05 | 三星泰科威株式会社 | Zoom lens system and photographing apparatus |
| CN107065154A (en) * | 2017-06-08 | 2017-08-18 | 西安中科飞图光电科技有限公司 | Compact continuous zooming optical system |
| CN114355590A (en) * | 2021-12-29 | 2022-04-15 | 福建福光股份有限公司 | Continuous zooming camera lens |
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