CN110850566B - Ultrashort 20-time medium wave continuous zoom lens without diffraction surface - Google Patents
Ultrashort 20-time medium wave continuous zoom lens without diffraction surface Download PDFInfo
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- CN110850566B CN110850566B CN201911091195.4A CN201911091195A CN110850566B CN 110850566 B CN110850566 B CN 110850566B CN 201911091195 A CN201911091195 A CN 201911091195A CN 110850566 B CN110850566 B CN 110850566B
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- 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
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Abstract
The invention provides an ultrashort 20-time medium wave continuous zooming optical lens without a diffraction surface, which is sequentially provided with an objective lens group, a single lens zooming group, a single lens compensation group, a fixed lens group and a focusing lens group along the direction of an optical path; the axial space length from the first optical surface to the last optical surface is 110 mm; by changing the positions of the single-lens magnification-varying group and the single-lens compensation group along the optical axis, 20-fold continuous zooming can be achieved. The invention adopts the aspheric surface, optimizes materials, reasonably distributes focal length, compresses the length of the lens, has compact structure, has the axial length from the first optical surface to the last optical surface of only 110mm, and keeps good image quality in the process of zooming by 20 times. And the optical system does not use a diffraction surface, so that the energy transmittance of the system and the temperature difference sensitivity of the system are improved, the processing difficulty and cost are reduced, and the system is simple to assemble and adjust and easy to produce in quantity.
Description
Technical Field
The invention relates to an ultrashort 20-time medium wave continuous zoom lens without a diffraction surface, and belongs to the technical field of optics.
Background
The infrared continuous zooming thermal imager is an imaging system with continuously variable focal length, stable image surface position and good image quality in the zooming process. The fixed-focus thermal infrared imager is required to obtain images with different sizes on an image surface, and the distance between a target object and a lens needs to be changed or the lens with different focal lengths needs to be replaced. The infrared continuous zooming thermal imager can continuously change the focal length of the system, so that target images with continuously changed sizes can be obtained on an image surface, and the infrared continuous zooming thermal imager is very favorable for photoelectric detection, reconnaissance, tracking and the like.
The general infrared continuous zoom lens has a longer whole light path, a reflector is generally required to be adopted to fold the light path so as to meet the requirement of the volume size of the system, the ultra-short continuous zoom optical system can meet the detection use requirements of most of small and medium-sized unmanned aerial vehicles, and the ultra-short continuous zoom optical system has wide application requirements in numerous military and civil fields such as remote target detection, frontier patrol, key area monitoring, personnel search and rescue and the like. In addition, most domestic continuous zooming optical systems use diffraction surfaces to correct chromatic aberration, the use of the diffraction surfaces can reduce the energy transmittance of the lens, reduce the temperature difference sensitivity of the system and increase the processing difficulty and cost of the lens, so that great demands are provided for developing an ultrashort continuous zooming optical system without the diffraction surfaces.
Disclosure of Invention
The invention provides an ultrashort medium wave continuous zooming optical lens without a diffraction surface, wherein a lens optical system does not use the diffraction surface, and the axial space length from a first optical surface to a last optical surface of the continuous zooming optical system is only 110mm by adopting an aspheric surface and optimizing materials and reasonably distributing focal lengths, so that 20-time optical continuous zooming is realized.
The technical scheme of the invention is as follows:
the ultrashort medium wave continuous zoom lens without a diffraction surface by 20 times is characterized in that: an objective lens group (1), a single lens zooming group (2), a single lens compensation group (3), a fixed lens group (4) and a focusing lens group (5) are sequentially arranged along the direction of a light path; the axial space length from the first optical surface to the last optical surface is 110 mm; by changing the positions of the single-lens variable-power group (2) and the single-lens compensation group (3) along the optical axis, 20-time continuous zooming can be realized.
Further preferably, the ultrashort medium wave continuous zoom lens without a diffraction surface with 20 times is characterized in that: when the distance between the objective lens group (1) and the single lens variable-power group (2) is 56.9mm, the distance between the single lens variable-power group (2) and the single lens compensation group (3) is 2mm, and the distance between the single lens compensation group (3) and the fixed lens group (4) is 3.9mm, a narrowest view field optical path with the focal length of 300mm is formed.
Further preferably, the ultrashort medium wave continuous zoom lens without a diffraction surface with 20 times is characterized in that: when the distance between the objective lens group (1) and the single lens variable power group (2) is 9.5mm, the distance between the single lens variable power group (2) and the single lens compensation group (3) is 51.3mm, and the distance between the single lens compensation group (3) and the fixed lens group (4) is 2mm, a widest view field light path with a focal length of 15m is formed.
Further preferably, the ultrashort medium wave continuous zoom lens without a diffraction surface with 20 times is characterized in that: a detector (6) is arranged behind the focusing mirror group (5) to form an ultra-short non-diffraction surface 20-time medium wave continuous zooming optical device.
Further preferably, the ultrashort medium wave continuous zoom lens without a diffraction surface with 20 times is characterized in that: the F number of the detector (6) is 4, and the detector (6) is a medium wave infrared focal plane detector with the pixel number of 320 multiplied by 240 and the pixel size of 30 mu m or a medium wave infrared focal plane detector with the pixel number of 640 multiplied by 480 and the pixel size of 15 mu m; the applicable wavelength is as follows: 3-5 μm.
Further preferably, the ultrashort medium wave continuous zoom lens without a diffraction surface with 20 times is characterized in that: the focusing lens group (5) comprises a first focusing lens (5-1) and a second focusing lens (5-2) which are sequentially arranged;
the incident surface and the emergent surface of the first objective lens (1-1) are both spherical surfaces, the radius of the incident surface is 98.1mm, the radius of the emergent surface is 411.7mm, and the thickness is 8.8 mm; the material of the first objective lens (1-1) is monocrystalline silicon; the distance between the emergent surface of the first objective lens (1-1) and the incident surface of the second objective lens (1-2) is 3.7 mm;
the incident surface and the emergent surface of the second objective lens (1-2) are both spherical surfaces, the radius of the incident surface is 807.9mm, the radius of the emergent surface is 231.9mm, and the thickness is 4 mm; the material of the second objective lens (1-2) is single crystal germanium; the distance range between the emergent surface of the second objective lens (1-2) and the incident surface of the single lens variable power group (2) is 9.5 mm-56.9 mm;
the incident surface of the single lens variable power group (2) is a spherical surface with the radius of minus 63.7mm, the emergent surface is an aspheric surface with the radius of 49.094mm and the thickness of 2 mm; the material of the single lens variable-power group (2) is monocrystalline silicon; the distance range between the exit surface of the single lens zooming group (2) and the entrance surface of the single lens compensation group (3) is 2 mm-51.3 mm;
the incidence surface of the single lens compensation group (3) is an aspheric surface, the radius is 36.2095mm, the exit surface is a spherical surface, the radius is-80.4 mm, and the thickness is 3.2 mm; the material of the single lens compensation group (3) is monocrystalline silicon; the distance range between the emergent surface of the single lens compensation group (3) and the incident surface of the first fixed mirror (4-1) is 2 mm-3.9 mm;
the incidence surface of the first fixed mirror (4-1) is an aspheric surface with the radius of-24.935 mm, the exit surface is a spherical surface with the radius of-42.87 mm and the thickness of 2 mm; the material of the first fixed mirror (4-1) is monocrystalline germanium; the distance between the emergent surface of the first fixed mirror (4-1) and the incident surface of the second fixed mirror (4-2) is 0.1 mm;
the incident surface and the emergent surface of the second fixed mirror (4-2) are both spherical surfaces, the radius of the incident surface is 8.345mm, the radius of the emergent surface is 5.073mm, and the thickness is 4.6 mm; the second fixed mirror (4-2) is made of monocrystalline silicon; the distance between the emergent surface of the second fixed mirror (4-2) and the incident surface of the first focusing mirror (5-1) is 11.2 mm;
the incident surface and the emergent surface of the first focusing lens (5-1) are spherical surfaces, the radius of the incident surface is 13.4mm, the radius of the emergent surface is 14.02mm, and the thickness is 3.95 mm; the first focusing lens (5-1) is made of calcium fluoride; the distance between the emergent surface of the first focusing lens (5-1) and the incident surface of the second focusing lens (5-2) is 0.7 mm;
the incidence surface of the second focusing lens (5-2) is an aspheric surface, the radius is 14.3076mm, the exit surface is a spherical surface, the radius is-891.2 mm, and the thickness is 2.6 mm; the material of the second focusing lens (5-2) is monocrystalline silicon.
Advantageous effects
The invention has the advantages that:
1. miniaturization
The invention adopts the aspheric surface, optimizes materials, reasonably distributes focal length, compresses the length of the lens, has compact structure, has the axial length from the first optical surface to the last optical surface of only 110mm, and keeps good image quality in the process of zooming by 20 times.
2. High energy transmittance and low processing cost
The optical system does not use a diffraction surface, so that the energy transmittance of the system and the temperature difference sensitivity of the system are improved, the processing difficulty and cost are reduced, and the system is simple to assemble and adjust and easy to produce in quantity.
Additional aspects and advantages of the invention will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the invention.
Drawings
The above and/or additional aspects and advantages of the present invention will become apparent and readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings of which:
FIG. 1 is a schematic view of the narrowest field-of-view optical path of the present invention;
FIG. 2 is a schematic view of the optical path of the intermediate field of view of the present invention;
FIG. 3 is a schematic view b of the optical path of the intermediate field of view of the present invention;
FIG. 4 is a schematic view of the optical path of the intermediate field of view of the present invention;
FIG. 5 is a schematic view of the widest field of view optical path of the present invention.
Detailed Description
The following detailed description of embodiments of the invention is intended to be illustrative, and not to be construed as limiting the invention.
The embodiment provides a medium wave continuous zooming optical lens with an ultrashort non-diffraction surface of 20 times, which is sequentially provided with an objective lens group 1, a single lens zooming group 2, a single lens compensation group 3, a fixed lens group 4 and a focusing lens group 5 along the direction of an optical path; the single lens zoom group and the single lens compensation group are linked to realize a large zoom ratio, high-grade aberration and chromatic aberration are reduced and an axial space is compressed by adopting aspheric surface and material optimization, satisfactory image quality is obtained in a full field and a full aperture, and the length of the axial space from a first optical surface to a last optical surface is 110 mm.
The objective lens group 1 comprises a first objective lens 1-1 and a second objective lens 1-2 which are sequentially arranged, the fixed lens group 4 comprises a first fixed lens 4-1 and a second fixed lens 4-2 which are sequentially arranged, and the focusing lens group 5 comprises a first focusing lens 5-1 and a second focusing lens 5-2 which are sequentially arranged. The radiation of the external scenery is focused on a focal plane 6 of the detector through a first objective lens 1-1, a second objective lens 1-2, a zoom lens 2, a compensating lens 3, a first fixed lens 4-1, a second fixed lens 4-2, a first focusing lens 5-1 and a second focusing lens 5-2. By varying the thickness of the mutual interval of the magnification-varying lens 2 and the compensation lens 3 along the optical axis, a 20-fold continuous-zoom optical system can be obtained. The detector has an F number of 4, and is a medium wave infrared focal plane detector with a pixel number of 320 multiplied by 240 and a pixel size of 30 mu m or a medium wave infrared focal plane detector with a pixel number of 640 multiplied by 480 and a pixel size of 15 mu m; the applicable wavelength is as follows: 3-5 μm.
When the zoom lens 2 and the compensation lens 3 are at the positions A1B1, the narrowest field-of-view optical path with the focal length of the optical system of 300mm is formed; the distance between the objective lens group 1 and the zoom lens 2 is 56.9mm, the distance between the zoom lens 2 and the compensation lens 3 is 2mm, and the distance between the compensation lens 3 and the fixed lens group 4 is 3.9 mm.
When the zoom lens 2 and the compensation lens 3 are at the positions of A2B2, a widest view field optical path with the focal length of the optical system of 15m is formed; the distance between the objective lens group 1 and the zoom lens 2 is 9.5mm, the distance between the zoom lens 2 and the compensation lens 3 is 51.3mm, and the distance between the compensation lens 3 and the fixed lens group 4 is 2 mm.
The image remains sharp throughout the entire zoom process.
Specific optical parameters are shown in the following table.
TABLE 1 optical System data sheet
Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention, and that variations, modifications, substitutions and alterations can be made in the above embodiments by those of ordinary skill in the art without departing from the principle and spirit of the present invention.
Claims (5)
1. An ultrashort 20-time medium wave continuous zoom lens without a diffraction surface is characterized in that: an objective lens group (1), a single lens zooming group (2), a single lens compensation group (3), a fixed lens group (4) and a focusing lens group (5) are sequentially arranged along the direction of a light path; the axial space length from the first optical surface to the last optical surface is 110 mm; the positions of the single-lens variable-power group (2) and the single-lens compensation group (3) are changed along the optical axis, so that 20-time continuous zooming can be realized;
the focusing lens group (5) comprises a first focusing lens (5-1) and a second focusing lens (5-2) which are sequentially arranged;
the incident surface and the emergent surface of the first objective lens (1-1) are both spherical surfaces, the radius of the incident surface is 98.1mm, the radius of the emergent surface is 411.7mm, and the thickness is 8.8 mm; the material of the first objective lens (1-1) is monocrystalline silicon; the distance between the emergent surface of the first objective lens (1-1) and the incident surface of the second objective lens (1-2) is 3.7 mm;
the incident surface and the emergent surface of the second objective lens (1-2) are both spherical surfaces, the radius of the incident surface is 807.9mm, the radius of the emergent surface is 231.9mm, and the thickness is 4 mm; the material of the second objective lens (1-2) is single crystal germanium; the distance range between the emergent surface of the second objective lens (1-2) and the incident surface of the single lens variable power group (2) is 9.5 mm-56.9 mm;
the incident surface of the single lens variable power group (2) is a spherical surface with the radius of minus 63.7mm, the emergent surface is an aspheric surface with the radius of 49.094mm and the thickness of 2 mm; the material of the single lens variable-power group (2) is monocrystalline silicon; the distance range between the exit surface of the single lens zooming group (2) and the entrance surface of the single lens compensation group (3) is 2 mm-51.3 mm;
the incidence surface of the single lens compensation group (3) is an aspheric surface, the radius is 36.2095mm, the exit surface is a spherical surface, the radius is-80.4 mm, and the thickness is 3.2 mm; the material of the single lens compensation group (3) is monocrystalline silicon; the distance range between the emergent surface of the single lens compensation group (3) and the incident surface of the first fixed mirror (4-1) is 2 mm-3.9 mm;
the incidence surface of the first fixed mirror (4-1) is an aspheric surface with the radius of-24.935 mm, the exit surface is a spherical surface with the radius of-42.87 mm and the thickness of 2 mm; the material of the first fixed mirror (4-1) is monocrystalline germanium; the distance between the emergent surface of the first fixed mirror (4-1) and the incident surface of the second fixed mirror (4-2) is 0.1 mm;
the incident surface and the emergent surface of the second fixed mirror (4-2) are both spherical surfaces, the radius of the incident surface is 8.345mm, the radius of the emergent surface is 5.073mm, and the thickness is 4.6 mm; the second fixed mirror (4-2) is made of monocrystalline silicon; the distance between the emergent surface of the second fixed mirror (4-2) and the incident surface of the first focusing mirror (5-1) is 11.2 mm;
the incident surface and the emergent surface of the first focusing lens (5-1) are spherical surfaces, the radius of the incident surface is 13.4mm, the radius of the emergent surface is 14.02mm, and the thickness is 3.95 mm; the first focusing lens (5-1) is made of calcium fluoride; the distance between the emergent surface of the first focusing lens (5-1) and the incident surface of the second focusing lens (5-2) is 0.7 mm;
the incidence surface of the second focusing lens (5-2) is an aspheric surface, the radius is 14.3076mm, the exit surface is a spherical surface, the radius is-891.2 mm, and the thickness is 2.6 mm; the material of the second focusing lens (5-2) is monocrystalline silicon.
2. The ultra-short non-diffraction surface 20-fold medium wave continuous zoom lens of claim 1, wherein: when the distance between the objective lens group (1) and the single lens variable-power group (2) is 56.9mm, the distance between the single lens variable-power group (2) and the single lens compensation group (3) is 2mm, and the distance between the single lens compensation group (3) and the fixed lens group (4) is 3.9mm, a narrowest view field optical path with the focal length of 300mm is formed.
3. The ultra-short non-diffraction surface 20-fold medium wave continuous zoom lens of claim 1, wherein: when the distance between the objective lens group (1) and the single lens variable power group (2) is 9.5mm, the distance between the single lens variable power group (2) and the single lens compensation group (3) is 51.3mm, and the distance between the single lens compensation group (3) and the fixed lens group (4) is 2mm, a widest view field light path with a focal length of 15m is formed.
4. The ultra-short non-diffraction surface 20-fold medium wave continuous zoom lens of claim 1, wherein: a detector (6) is arranged behind the focusing mirror group (5) to form an ultra-short non-diffraction surface 20-time medium wave continuous zooming optical device.
5. The ultra-short non-diffraction surface 20-fold medium wave continuous zoom lens of claim 4, wherein: the F number of the detector (6) is 4, and the detector (6) is a medium wave infrared focal plane detector with the pixel number of 320 multiplied by 240 and the pixel size of 30 mu m or a medium wave infrared focal plane detector with the pixel number of 640 multiplied by 480 and the pixel size of 15 mu m; the applicable wavelength is as follows: 3-5 μm.
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| JP2009216920A (en) * | 2008-03-10 | 2009-09-24 | Olympus Imaging Corp | Imaging device having zoom lens |
| CN103852874A (en) * | 2014-03-14 | 2014-06-11 | 山东神戎电子股份有限公司 | Continuous zooming infrared lens with extra large zoom ratio |
| CN203981958U (en) * | 2014-06-26 | 2014-12-03 | 北京蓝思泰克科技有限公司 | A kind of large zoom ratio medium wave infrared continuous zoom lens |
| CN204595312U (en) * | 2015-05-19 | 2015-08-26 | 昆明全波红外科技有限公司 | A kind of continuous vari-focus infrared lens |
| CN106054364A (en) * | 2016-08-23 | 2016-10-26 | 山东神戎电子股份有限公司 | High-transmittance medium-wave infrared zoom lens |
| CN209167667U (en) * | 2018-09-14 | 2019-07-26 | 北京蓝思泰克科技有限公司 | A kind of big zoom ratio medium-wave infrared refrigeration continuous magnification lens |
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2019
- 2019-11-09 CN CN201911091195.4A patent/CN110850566B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2009216920A (en) * | 2008-03-10 | 2009-09-24 | Olympus Imaging Corp | Imaging device having zoom lens |
| CN103852874A (en) * | 2014-03-14 | 2014-06-11 | 山东神戎电子股份有限公司 | Continuous zooming infrared lens with extra large zoom ratio |
| CN203981958U (en) * | 2014-06-26 | 2014-12-03 | 北京蓝思泰克科技有限公司 | A kind of large zoom ratio medium wave infrared continuous zoom lens |
| CN204595312U (en) * | 2015-05-19 | 2015-08-26 | 昆明全波红外科技有限公司 | A kind of continuous vari-focus infrared lens |
| CN106054364A (en) * | 2016-08-23 | 2016-10-26 | 山东神戎电子股份有限公司 | High-transmittance medium-wave infrared zoom lens |
| CN209167667U (en) * | 2018-09-14 | 2019-07-26 | 北京蓝思泰克科技有限公司 | A kind of big zoom ratio medium-wave infrared refrigeration continuous magnification lens |
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