CN108828750B - Large-caliber ultra-high resolution infrared lens - Google Patents
Large-caliber ultra-high resolution infrared lens Download PDFInfo
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- CN108828750B CN108828750B CN201811032409.6A CN201811032409A CN108828750B CN 108828750 B CN108828750 B CN 108828750B CN 201811032409 A CN201811032409 A CN 201811032409A CN 108828750 B CN108828750 B CN 108828750B
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- 229910052732 germanium Inorganic materials 0.000 claims abstract description 20
- GNPVGFCGXDBREM-UHFFFAOYSA-N germanium atom Chemical compound [Ge] GNPVGFCGXDBREM-UHFFFAOYSA-N 0.000 claims abstract description 20
- 239000000463 material Substances 0.000 claims abstract description 17
- 150000004770 chalcogenides Chemical class 0.000 claims abstract description 6
- 239000004429 Calibre Substances 0.000 claims 1
- 238000003384 imaging method Methods 0.000 abstract description 14
- 230000003044 adaptive effect Effects 0.000 abstract description 2
- 230000007547 defect Effects 0.000 abstract description 2
- 230000003287 optical effect Effects 0.000 description 6
- 238000010586 diagram Methods 0.000 description 4
- 239000005387 chalcogenide glass Substances 0.000 description 3
- 239000011521 glass Substances 0.000 description 3
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 238000001931 thermography Methods 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
- G02B13/14—Optical objectives specially designed for the purposes specified below for use with infrared or ultraviolet radiation
-
- 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
- G02B13/002—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras characterised by the lens design having at least one aspherical surface
- G02B13/004—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras characterised by the lens design having at least one aspherical surface having four lenses
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B13/00—Optical objectives specially designed for the purposes specified below
- G02B13/18—Optical objectives specially designed for the purposes specified below with lenses having one or more non-spherical faces, e.g. for reducing geometrical aberration
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- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Health & Medical Sciences (AREA)
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Abstract
The invention relates to a large-caliber ultra-high resolution infrared lens which comprises a first lens, a second lens, a third lens and a fourth lens, wherein one surface of the first lens is a diaphragm surface, and light rays sequentially pass through the first lens, the second lens, the third lens and the fourth lens from the diaphragm surface to finally reach an image surface; the first lens is a double-meniscus positive lens, adopts germanium material or chalcogenide material, and has positive focal power; the second lens is a double-meniscus negative lens, and adopts a chalcogenide material, and the focal power is negative; the third lens is a double-meniscus positive lens, adopts germanium material, and has positive focal power; the fourth lens is a double-meniscus positive lens, adopts germanium material, and has positive focal power; the infrared lens can meet the imaging requirements of large caliber and high resolution, and solves the defects of poor imaging performance caused by relatively low diffraction limit and weak corresponding energy of the existing long-wave infrared lens in the long-wave infrared range, and the uncooled long-wave infrared detector with the adaptive resolution of 1280 x 1024 and the pixel size of 15um can be used.
Description
Technical Field
The invention relates to a large-caliber ultra-high resolution infrared lens.
Background
The requirements on infrared lenses in the field of army and civilian are increasing. In the long-wave infrared range, the wavelength is longer, the diffraction limit is relatively lower, and the corresponding energy is weaker, so that the relative aperture of the lens needs to be increased to enhance the energy entering the optical system so as to improve the imaging performance.
With the rapid development of uncooled focal plane detector technology, the detector area array is larger and larger, the pixel size is smaller and the resolution is higher and higher. The uncooled long-wave infrared detector with the adaptive resolution of 1280 x 1024 and the pixel size of 15um on the market has few lenses, and the large relative aperture is almost not available. Therefore, in order to meet the rapid development requirement of infrared thermal imaging, a large-caliber ultra-high resolution infrared lens is imperative.
Disclosure of Invention
The invention provides a large-caliber ultra-high-resolution infrared lens, which aims to solve the defect of poor imaging performance caused by relatively low diffraction limit and weak corresponding energy of the existing long-wave infrared lens in a long-wave infrared range.
The technical scheme of the invention is as follows:
the infrared lens with large caliber and ultrahigh resolution comprises a first lens A, a second lens B, a third lens C and a fourth lens D which are sequentially arranged from left to right, wherein the left side surface of the first lens A is a diaphragm surface, and light rays sequentially pass through the first lens A, the second lens B, the third lens C and the fourth lens D from the diaphragm surface to reach an image surface; the first lens A is a double-meniscus positive lens, adopts germanium material or chalcogenide material, and has positive focal power; the second lens B is a double-meniscus negative lens, and adopts a chalcogenide material, and the focal power is negative; the third lens C is a double-meniscus positive lens, adopts germanium material, and has positive focal power; the fourth lens D is a double-meniscus positive lens, adopts germanium material, and has positive focal power; setting the focal length of the infrared lens as f, then:
focal length f of first lens A Satisfy the following requirements
Focal length f of second lens B Satisfy the following requirements
Focal length f of third lens C Satisfy the following requirements
Focal length f of fourth lens D Satisfy the following requirements
Further, in order to better meet the requirements of large caliber and high resolution, the first lens A, the second lens B, the third lens C and the fourth lens D are sequentially arranged from left to right, the right side surface of the first lens A, the left side surface of the third lens C and the right side surface of the fourth lens D are all aspheric surfaces, are aspheric surfaces without diffraction surfaces, and the other surfaces are spherical surfaces.
Further, in order to improve imaging quality, the first lens a, the second lens B, the third lens C, and the fourth lens D are all coated with an antireflection film.
Further, the materials of the first lens A, the third lens C and the fourth lens D are all monocrystalline germanium.
Further, the focal length f of the first lens A A Satisfy the following requirements
Focal length f of second lens B B Satisfy the following requirements
Focal length f of third lens C C Satisfy->
Focal length f of fourth lens D D Satisfy->
Further, the focal length f of the first lens A A Satisfy the following requirements
Focal length f of second lens B B Satisfy the following requirements
Focal length f of third lens C C Satisfy->
Focal length f of fourth lens D D Satisfy->
Further, the focal length f of the first lens A A Satisfy the following requirements
Focal length f of second lens B B Satisfy the following requirements
Focal length f of third lens C C Satisfy->
Focal length f of fourth lens D D Satisfy->
The invention has the beneficial effects that:
according to the large-caliber ultra-high resolution infrared lens, through multi-azimuth design of the lens composition structure, the lens type, the lens material, the lens focal power and the focal length, the finally obtained infrared lens can meet the imaging requirement of large caliber ultra-high resolution, and can be adapted to an uncooled long-wave infrared detector with the resolution of 1280 x 1024 and the pixel size of 15um.
Drawings
FIG. 1 is a schematic diagram of an infrared lens according to the present invention;
fig. 2 is a MTF graph of a first embodiment of the present invention;
FIG. 3 is a field diagram of a first embodiment of the present invention;
FIG. 4 is a distortion chart of a first embodiment of the present invention;
fig. 5 is a MTF graph of a second embodiment of the present invention;
FIG. 6 is a field diagram of a second embodiment of the present invention;
FIG. 7 is a distortion chart of a second embodiment of the present invention;
fig. 8 is a MTF graph of a third embodiment of the present invention;
FIG. 9 is a field curvature diagram of a third embodiment of the present invention;
fig. 10 is a distortion chart of a third embodiment of the present invention.
Detailed Description
The invention will be described in detail below with reference to the accompanying drawings and with reference to three embodiments.
As shown in fig. 1, the large-caliber ultra-high resolution infrared lens comprises a first lens a, a second lens B, a third lens C and a fourth lens D, wherein the left side surface of the first lens a is a diaphragm surface, and light rays sequentially pass through the first lens a, the second lens B, the third lens C and the fourth lens D from left to right and finally reach an image surface E through transmission; eight working surfaces of the four lenses are a first working surface S1, a second working surface S2, a third working surface S3, a fourth working surface S4, a fifth working surface S5, a sixth working surface S6, a seventh working surface S7 and an eighth working surface S8 in order from left to right.
The optical indexes of the infrared lens of the three embodiments are as follows:
lens focal length: 50mm;
wavelength: 8um-14um;
f number: 0.85;
angle of view: 13.8 °;
the detector has the following specification: 1280×1024, 15um.
The lens parameters of the first embodiment are as follows:
| surface of the body | Surface of the body | Radius of curvature | Thickness of (L) | Glass |
| Object plane | Spherical surface | Infinity is provided | Infinity is provided | - |
| First working surface S1 | Spherical surface | 51.2mm | 6mm | Germanium (Ge) |
| Second working surface S2 | Aspherical surface | 64.0mm | 10.27mm | - |
| Third working surface S3 | Spherical surface | 35.07mm | 3.8mm | Chalcogenide glass |
| Fourth working surface S4 | Spherical surface | 27.3mm | 25.44mm | - |
| Fifth working surface S5 | Aspherical surface | 35.3mm | 4.3mm | Germanium (Ge) |
| Sixth working surface S6 | Spherical surface | 37.38mm | 8.4mm | - |
| Seventh working surface S7 | Aspherical surface | 181.1mm | 4.7mm | Germanium (Ge) |
| Eighth working surface S8 | Spherical surface | -4900mm | 12.11mm | - |
| Image plane | Spherical surface | Infinity is provided | - |
In the first embodiment, the focal length f of the first lens A A Satisfy the following requirements
Focal length f of second lens B B Satisfy the following requirements
Focal length f of third lens C C Satisfy->
Focal length f of fourth lens D D Satisfy->
The focal power of the first lens is positive, and the ratio of the focal power of the first lens to the focal power of the whole lens is
The focal power of the second lens is negative, the secondThe ratio of the focal power of the lens to the focal power of the whole lens is
The third lens has positive focal power, and the ratio of the focal power of the third lens to the focal power of the whole lens is +.>
The focal power of the fourth lens is positive, and the ratio of the focal power of the fourth lens to the focal power of the whole lens is +.>
The lens parameters of the second embodiment are as follows:
| surface of the body | Surface of the body | Radius of curvature | Thickness of (L) | Glass |
| Object plane | Spherical surface | Infinity is provided | Infinity is provided | - |
| First working surface S1 | Spherical surface | 51.58mm | 6mm | Germanium (Ge) |
| Second working surface S2 | Aspherical surface | 66.4mm | 9.7mm | - |
| Third working surface S3 | Spherical surface | 36.5mm | 3.7mm | Chalcogenide glass |
| Fourth working surface S4 | Spherical surface | 27mm | 25.6mm | - |
| Fifth working surface S5 | Aspherical surface | 36.4mm | 5mm | Germanium (Ge) |
| Sixth working surface S6 | Spherical surface | 40.7mm | 8.77mm | - |
| Seventh working surface S7 | Aspherical surface | 363.9mm | 4.7mm | Germanium (Ge) |
| Eighth working surface S8 | Spherical surface | -467.0mm | 8.6mm | - |
| Image plane | Spherical surface | Infinity is provided | - |
In the second embodiment, the focal length f of the first lens A A Satisfy the following requirements
Focal length f of second lens B B Satisfy the following requirements
Focal length f of third lens C C Satisfy->
Focal length f of fourth lens D D Satisfy->
The focal power of the first lens is positive, and the ratio of the focal power of the first lens to the focal power of the whole lens is
The focal power of the second lens is negative, and the ratio of the focal power of the second lens to the focal power of the whole lens is +.>
The third lens has positive focal power, and the ratio of the focal power of the third lens to the focal power of the whole lens is +.>
The focal power of the fourth lens is positive, and the ratio of the focal power of the fourth lens to the focal power of the whole lens is +.>
The lens parameters of the third embodiment are as follows:
| surface of the body | Surface of the body | Radius of curvature | Thickness of (L) | Glass |
| Object plane | Spherical surface | Infinity is provided | Infinity is provided | - |
| First working surface S1 | Spherical surface | 53.6mm | 6mm | Germanium (Ge) |
| Second working surface S2 | Aspherical surface | 65.87mm | 13.3mm | - |
| Third working surface S3 | Spherical surface | 36.2mm | 3.7mm | Chalcogenide glass |
| Fourth working surface S4 | Spherical surface | 28.6mm | 22.93mm | - |
| Fifth working surface S5 | Aspherical surface | 35.6mm | 5mm | Germanium (Ge) |
| Sixth working surface S6 | Spherical surface | 37.9mm | 9.52mm | - |
| Seventh working surface S7 | Aspherical surface | 119.2mm | 4.7mm | Germanium (Ge) |
| Eighth working surface S8 | Spherical surface | 318.1mm | 9.55mm | - |
| Image plane | Spherical surface | Infinity is provided | - |
In embodiment three, the focal length f of the first lens A A Satisfy the following requirements
Focal length f of second lens B B Satisfy the following requirements
Focal length f of third lens C C Satisfy->
Focal length f of fourth lens D D Satisfy->
The focal power of the first lens is positive, and the ratio of the focal power of the first lens to the focal power of the whole lens is
The focal power of the second lens is negative, and the ratio of the focal power of the second lens to the focal power of the whole lens is +.>
The third lens has positive focal power, and the ratio of the focal power of the third lens to the focal power of the whole lens is +.>
The focal power of the fourth lens is positive, and the ratio of the focal power of the fourth lens to the focal power of the whole lens is +.>
The aspherical equation is as follows:
in the above, Z is the sagittal height from the apex of the aspheric surface when the aspheric surface is at the position Y along the optical axis direction, C 0 The paraxial curvature of the lens is given by K, which is the conic coefficient, and A, B, C, D, E, which is the higher order aspheric coefficient.
Table 1 shows the aspherical parameters of example one.
Table 1 table of parameters of aspherical and diffractive surfaces in example one
Fig. 2 to 4 are graphs showing optical performance of the first embodiment.
Fig. 2 is a graph of MTF (modulation transfer function) at a temperature point of 20 ℃ as a function of modulation ratio between an actual image and an ideal image with respect to spatial frequency at a certain spatial frequency. The MTF curve has an abscissa of spatial resolution lp/mm and an ordinate of contrast (%), and the higher the curve, the better the imaging quality.
As shown in FIG. 2, when the temperature is 20 ℃ and the spatial frequency is 33.4lp/mm, the MTF values of the 0 view field are all larger than those of the 0.57,1 view field and are all larger than 0.39, which indicates that the lens can meet the imaging requirements of large caliber and high resolution.
Fig. 3-4 show field curvature and distortion graphs of the first embodiment, in which the absolute value of the field curvature is less than 0.1 and the absolute value of the relative distortion is less than 0.5%, so the imaging quality of the lens is good as can be seen from fig. 2-4.
Table 2 table of parameters of aspherical and diffractive surfaces in example two
Fig. 5 to 7 are graphs showing optical performance of the second embodiment. Fig. 5 is a MTF plot for example two at a temperature point of 20 ℃. When the temperature is 20 ℃ and the spatial frequency is 33.4lp/mm, the MTF values of the 0 view field are larger than those of the 0.54,1 view field and are larger than 0.38, which indicates that the lens can meet the imaging requirements of large caliber and high resolution.
Fig. 6 and 7 are graphs of field curvature and distortion in the second embodiment, respectively, wherein the absolute value of the field curvature is less than 0.1, and the absolute value of the relative distortion is less than 0.5%. Therefore, as can be seen from fig. 5, 6 and 7, the lens has good imaging quality.
Table 3 shows the aspherical and diffractive surface parameters of example three.
Table 3 table of parameters of aspherical and diffractive surfaces in example three
Fig. 8 to 10 are graphs showing optical performance of the third embodiment. FIG. 8 is a graph of MTF at 20deg.C for the third embodiment, wherein when the temperature is 20deg.C and the spatial frequency is 33.41p/mm, the MTF values of the 0 field of view are all greater than 0.57,1 field of view, and the MTF values are all greater than 0.4, which indicates that the lens can meet the requirements of large-caliber and high-resolution imaging.
Fig. 9 and 10 are graphs of field curvature and distortion in the third embodiment, respectively, wherein the absolute value of the field curvature is less than 0.1, and the absolute value of the relative distortion is less than 0.5%. Therefore, as can be seen from fig. 8 and fig. 9, based on fig. 10, the lens has good imaging quality.
As can be seen from the three embodiments, the focal length f of the first lens a A Satisfy the following requirements
Focal length f of second lens B B Satisfy->
Focal length f of third lens C C Satisfy->
Focal length f of fourth lens D D Satisfy->
Can meet the imaging requirements.
The minimum F number of the large-caliber ultra-high resolution infrared lens can be 0.8, and the working wave band range is 8-14 um. The pixel number of the lens can reach 131 ten thousand pixels, and the lens is more suitable for a high-performance photoelectric system.
The "from left to right", "left", "right", and the like in the embodiments are not spatially defined as absolute positions, but are merely illustrative for convenience of description and understanding of the relative positional relationship.
Claims (7)
1. The utility model provides an infrared camera lens of heavy-calibre super high resolution which characterized in that: the lens comprises a first lens (A), a second lens (B), a third lens (C) and a fourth lens (D) which are sequentially arranged from left to right, wherein the left side surface of the first lens (A) is a diaphragm surface, and light rays sequentially transmit through the first lens (A), the second lens (B), the third lens (C) and the fourth lens (D) from the diaphragm surface to reach an image surface; the first lens (A) is a double-meniscus positive lens, adopts germanium material or chalcogenide material, and has positive focal power; the second lens (B) is a double-meniscus negative lens, and adopts a chalcogenide material, and the focal power is negative; the third lens (C) is a double-meniscus positive lens, adopts germanium material, and has positive focal power; the fourth lens (D) is a double-meniscus positive lens, adopts germanium material and has positive focal power; setting the focal length of the infrared lens as f, then:
focal length f of first lens (A) A Satisfy the following requirements
Focal length f of second lens (B) B Satisfy the following requirements
Focal length f of third lens (C) C Satisfy the following requirements
Focal length f of fourth lens (D) D Satisfy the following requirements
2. The large-caliber ultra-high resolution infrared lens according to claim 1, wherein:
the right side surface of the first lens (A), the left side surface of the third lens (C) and the right side surface of the fourth lens (D) are all aspheric, and the other surfaces are all spherical.
3. The large-caliber ultra-high resolution infrared lens according to claim 2, wherein: the first lens (A), the second lens (B), the third lens (C) and the fourth lens (D) are all plated with an antireflection film.
4. A large caliber ultra high resolution infrared lens as claimed in claim 3, wherein: the first lens (A), the third lens (C) and the fourth lens (D) are made of monocrystalline germanium.
5. The large-caliber ultra-high resolution infrared lens according to any one of claims 1 to 4, wherein:
focal length f of first lens (A) A Satisfy the following requirements
Focal length f of second lens (B) B Satisfy->
Focal length f of third lens (C) V Satisfy->
Focal length f of fourth lens (D) D Satisfy->
6. The large-caliber ultra-high resolution infrared lens according to any one of claims 1 to 4, wherein:
focal length f of first lens (A) A Satisfy the following requirements
Focal length f of second lens (B) B Satisfy->
Focal length f of third lens (C) C Satisfy->
Focal length f of fourth lens (D) D Satisfy->
7. The large-caliber ultra-high resolution infrared lens according to any one of claims 1 to 4, wherein:
focal length f of first lens (A) A Satisfy the following requirements
Focal length f of second lens (B) B Satisfy->
Focal length f of third lens (C) C Satisfy->
Focal length f of fourth lens (D) D Satisfy->
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| CN201811032409.6A CN108828750B (en) | 2018-09-05 | 2018-09-05 | Large-caliber ultra-high resolution infrared lens |
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| CN201811032409.6A CN108828750B (en) | 2018-09-05 | 2018-09-05 | Large-caliber ultra-high resolution infrared lens |
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| CN108828750B true CN108828750B (en) | 2023-07-04 |
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| CN114252982B (en) * | 2021-12-14 | 2023-04-21 | 安徽光智科技有限公司 | Athermal infrared lens with focal length of 35mm, assembly method and imaging method thereof |
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| EP0644688A1 (en) * | 1993-09-17 | 1995-03-22 | Lg Electronics Inc. | Rear focus type zoom lens including optical view finder integral therewith |
| JP2009192886A (en) * | 2008-02-15 | 2009-08-27 | Nikon Corp | Infrared zoom lens |
| CN102636863A (en) * | 2012-04-24 | 2012-08-15 | 中国电子科技集团公司第十一研究所 | Infrared double waveband confocal optical system |
| CN205809398U (en) * | 2016-06-01 | 2016-12-14 | 北京蓝思泰克科技有限公司 | A kind of large aperture long wave double-view field infrared optical lens |
| CN107357028A (en) * | 2017-07-04 | 2017-11-17 | 西安泰豪红外科技有限公司 | A kind of optics of wide temperature range is without thermalization camera lens |
| CN207216121U (en) * | 2017-08-22 | 2018-04-10 | 北京蓝思泰克科技有限公司 | A kind of large aperture wide-angle LONG WAVE INFRARED tight shot |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| TWI544229B (en) * | 2012-07-17 | 2016-08-01 | 鴻海精密工業股份有限公司 | Image lens |
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2018
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0644688A1 (en) * | 1993-09-17 | 1995-03-22 | Lg Electronics Inc. | Rear focus type zoom lens including optical view finder integral therewith |
| JP2009192886A (en) * | 2008-02-15 | 2009-08-27 | Nikon Corp | Infrared zoom lens |
| CN102636863A (en) * | 2012-04-24 | 2012-08-15 | 中国电子科技集团公司第十一研究所 | Infrared double waveband confocal optical system |
| CN205809398U (en) * | 2016-06-01 | 2016-12-14 | 北京蓝思泰克科技有限公司 | A kind of large aperture long wave double-view field infrared optical lens |
| CN107357028A (en) * | 2017-07-04 | 2017-11-17 | 西安泰豪红外科技有限公司 | A kind of optics of wide temperature range is without thermalization camera lens |
| CN207216121U (en) * | 2017-08-22 | 2018-04-10 | 北京蓝思泰克科技有限公司 | A kind of large aperture wide-angle LONG WAVE INFRARED tight shot |
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Address after: 710077 8th floor, block a, no.1309, Shanglinyuan 4th Road, high tech Zone, Xi'an City, Shaanxi Province Applicant after: Xi'an zhongkelide Infrared Technology Co.,Ltd. Address before: Room 201, block a, No.32, development avenue, new industrial park, high tech Zone, Xi'an, Shaanxi 710119 Applicant before: XI'AN TELLHOW INFRARED TECHNOLOGY Co.,Ltd. |
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| GR01 | Patent grant | ||
| GR01 | Patent grant |