CN116540388A - Ultra-high resolution wide-angle infrared lens - Google Patents
Ultra-high resolution wide-angle infrared lens Download PDFInfo
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- CN116540388A CN116540388A CN202310323203.3A CN202310323203A CN116540388A CN 116540388 A CN116540388 A CN 116540388A CN 202310323203 A CN202310323203 A CN 202310323203A CN 116540388 A CN116540388 A CN 116540388A
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- 230000003287 optical effect Effects 0.000 claims abstract description 22
- 230000005499 meniscus Effects 0.000 claims abstract description 8
- 239000000463 material Substances 0.000 claims description 4
- 229910052732 germanium Inorganic materials 0.000 claims description 3
- GNPVGFCGXDBREM-UHFFFAOYSA-N germanium atom Chemical compound [Ge] GNPVGFCGXDBREM-UHFFFAOYSA-N 0.000 claims description 3
- 238000003384 imaging method Methods 0.000 abstract description 12
- 238000001514 detection method Methods 0.000 abstract description 8
- 238000012544 monitoring process Methods 0.000 abstract description 4
- 238000003331 infrared imaging Methods 0.000 description 2
- 230000002411 adverse Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 230000004297 night vision Effects 0.000 description 1
- 239000011148 porous material Substances 0.000 description 1
- 210000001747 pupil Anatomy 0.000 description 1
- 230000005855 radiation Effects 0.000 description 1
Classifications
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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
- G02B13/06—Panoramic objectives; So-called "sky lenses" including panoramic objectives having reflecting surfaces
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B13/00—Optical objectives specially designed for the purposes specified below
-
- 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
- G02B13/001—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras
- G02B13/008—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras designed for infrared light
-
- 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
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- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Health & Medical Sciences (AREA)
- Toxicology (AREA)
- Lenses (AREA)
Abstract
The invention relates to an ultra-high resolution wide-angle infrared lens, which is sequentially provided with a first lens, a second lens, a third lens and a fourth lens along an optical axis from an object side to an image side, wherein the first lens, the second lens and the fourth lens are all meniscus lenses with convex surfaces facing the object side, and the third lens is a meniscus lens with concave surfaces facing the object side. The size between the lenses along the optical axis direction of the wide-angle infrared lens under the 15mm focal length is as follows: the air interval between the first lens and the second lens is 24.25mm, and the air interval between the second lens and the third lens is 16.25mm; the air interval between the third lens and the fourth lens is 10mm; the distance between the fourth lens and the focal plane of the infrared detector is 11.88mm. The ultra-high resolution wide-angle lens has the advantages of high imaging quality, large detection range of a field of view, compact structure, low cost and the like, and can be applied to security monitoring, industrial monitoring, military airborne pods and the like.
Description
Technical Field
The invention relates to an infrared lens, in particular to an ultra-high resolution wide-angle infrared lens.
Background
The infrared imaging technology is used as a passive infrared night vision technology, and the principle is that infrared radiation of a target is detected to observe an observation target, so that the infrared imaging technology is free from adverse environmental influences such as rain, snow, wind and frost, night, electromagnetic interference and the like, and the imaging of the detection target is realized within 24 hours all the day. In recent years, with the demand for high-definition infrared images, ultra-high resolution infrared detectors and infrared lenses are gradually used in the fields of industrial detection, army and police countermeasure, and the like, because of their high imaging quality and clear pictures.
However, in an application scene with a detection distance within hundred meters, the current ultra-high resolution infrared detection system cannot widely display the detected scene images to obtain more image information due to the small field angle of the system, so that the application of the system is limited.
Disclosure of Invention
The invention provides a super-resolution wide-angle infrared lens, the focal length dimension of which is 15mm, and the super-resolution infrared lens can be matched with 1280 x 1024@12 mu m detectors (pixel units: 1280 x 1024@12 mu m, pixel size: 12 mu m). The lens consists of 4 lenses, and compared with a common 2-lens, the lens increases the angle of view from the current 28.8 degrees (horizontal angle of view) to 54.6 degrees (horizontal angle of view), and a wide-angle high-definition image with a large field of view is realized in hundred-meter detection. The ultra-high resolution wide-angle lens has the advantages of high imaging quality, large detection range of a field of view, compact structure, low cost and the like, and can be applied to security monitoring, industrial monitoring, military airborne pods and the like.
In order to achieve the above purpose, the invention is realized by the following technical scheme:
the ultra-high resolution wide-angle infrared lens is characterized in that a first lens, a second lens, a third lens and a fourth lens are sequentially arranged from an object side to an image side along an optical axis, the first lens, the second lens and the fourth lens are all meniscus lenses with convex surfaces facing the object side, and the third lens is a meniscus lens with concave surfaces facing the object side. The light rays sequentially enter the first lens, the second lens, the third lens and the fourth lens from left to right along the optical axis direction and finally enter the focal plane of the infrared detector through the detector window.
Further preferably, the wide-angle infrared lens has the following dimensions between the lenses in the optical axis direction at a focal length of 15 mm: the air interval between the first lens and the second lens is 24.25mm, and the air interval between the second lens and the third lens is 16.25mm; the air interval between the third lens and the fourth lens is 10mm; the distance between the fourth lens and the focal plane of the infrared detector is 11.88mm.
Further preferably, the focal length f of the first lens 1 Less than or equal to-43.27 mm, focal length f of second lens 2 38.21mm or less, focal length f of third lens 3 The focal length f of the fourth lens is less than or equal to 55.29mm 4 The focal length f of the whole optical system formed by the first lens, the second lens, the third lens and the fourth lens is less than or equal to 23.96mm and less than or equal to 15mm.
Further preferably, curved surfaces of the first lens element, the second lens element, the third lens element and the fourth lens element in the object-side to image-side directions are respectively denoted by S1, S2, S3, S4, S5, S6, S7 and S8; the thickness of the center of the first lens is 15.2mm, the thickness of the center of the second lens is 9.25mm, the thickness of the center of the third lens is 4.73mm, and the thickness of the center of the fourth lens is 3.1mm; the radius of curvature of S1 is 24.872628mm, the radius of curvature of S2 is 17.987316mm, the radius of curvature of S3 is 23.892824mm, the radius of curvature of S4 is 28.098396mm, the radius of curvature of S5 is 67.287643, the radius of curvature of S6 is 50.760981, the radius of curvature of S7 is 73.456739, and S8 is a plane.
Further preferably, S1, S2, S3, S4, S5, S6, S7 are aspherical lenses, and S8 is a spherical lens.
Further preferably, the aspherical lens curves in the first lens, the second lens, the third lens, and the fourth lens satisfy the following equation expression:
wherein z is the distance vector height of the aspheric surface from the vertex of the aspheric surface when the aspheric surface reaches the height r along the optical axis direction;
c, curvature of the aspheric vertex;
k: conical surface coefficient constant;
r radial distance;
A 4 、A 6 、A 8 expressed as higher order aspheric coefficients.
Further preferably, the first lens, the second lens, the third lens and the fourth lens are all made of germanium material.
Compared with the prior art, the invention has the following advantages:
the device has the advantages of compact structure, reasonable design, less lens number and good imaging quality, and can meet the requirement of the ultra-high resolution infrared wide-angle lens of the infrared detector with the high resolution of 1280 x 1024@12 mu m. In addition, the device has the advantages of convenient installation, simple operation and good economic performance. Strong practicability and the like.
Drawings
FIG. 1 is a schematic view of the optical structure of the present invention; in the figure, a 1-first lens, a 2-second lens, a 3-third lens, a 4-fourth lens and a 5-infrared detector focal plane are shown.
FIG. 2 is a graph of MTF at 20℃at a 15mm focal length according to the present invention.
FIG. 3 is a graph of distortion at 15mm focal length for the present invention.
FIG. 4 is a graph of MTF at 20℃at a focal length of 13mm for the present invention.
FIG. 5 is a graph of distortion at 13mm focal length for the present invention.
Detailed Description
In order to make the objects, technical solutions and advantageous effects of the present invention more apparent, preferred embodiments of the present invention will be described in detail below to facilitate understanding by the skilled person.
The invention provides an ultra-high resolution wide-angle infrared lens, which increases the field angle of an infrared lens with hundred-meter detection distance (resolution: 640 x 512@12 μm) from the current 28.8 DEG (horizontal field angle) to 54.6 DEG (horizontal field angle) and improves the field angle to the ultra-high resolution (1280 x 1024@12 μm) infrared wide-angle lens. As shown in fig. 1, the ultra-high resolution wide-angle infrared lens is sequentially provided with a first lens, a second lens, a third lens and a fourth lens along an optical axis from an object side to an image side, wherein the first lens, the second lens and the fourth lens are all meniscus lenses with convex surfaces facing the object side, and the third lens is a meniscus lens with concave surfaces facing the object side. The light rays sequentially enter the first lens 1, the second lens 2, the third lens 3 and the fourth lens 4 from left to right along the optical axis direction, and finally enter the infrared detector focal plane 5 through the detector window.
The size between the lenses along the optical axis direction of the wide-angle infrared lens under the 15mm focal length is as follows: the air interval between the first lens and the second lens is 24.25mm, and the air interval between the second lens and the third lens is 16.25mm; the air interval between the third lens and the fourth lens is 10mm; the distance between the fourth lens and the focal plane of the infrared detector is 11.88mm.
In the invention, the materials of the first lens, the second lens, the third lens and the fourth lens are germanium materials.
In the present invention, the focal length of the first lens 1 is f 1 The focal length of the second lens 2 is f 2 Focal length dimension f of third lens 3 3 The focal length of the fourth lens 4 is f 4 . The focal length of the whole optical system composed of the first lens 1, the second lens 2, the third lens 3 and the fourth lens 4 is f.
f 1 ≤-43.27mm；f 2 ≤38.21mm；f 3 ≤55.29mm；f 4 ≤23.96mm；f≤15mm
The lens can obtain good imaging quality within the wavelength range of 8um-14 um by meeting the conditions. And the lens can adjust the focal length of each lens by rotating the focusing ring in the focal length range according to actual conditions, so that the optimal focal position of imaging is found.
On the basis of the above, as a further improvement of the present invention, the optical structure composed of the first lens 1, the second lens 2, the third lens 3 and the fourth lens 4 achieves the following index:
1) Working wave band: 8 μm to 14 μm;
2) Focal length: f=15 mm;
3) Relative pore diameter D/f:1/1.0;
4) Angle of view (D x H x V): 67.5 °. 54.6 °. 44.5 °;
5) TV distortion: <0.55%;
6) Exit pupil distance: 5.15mm;
7) Resolution ratio: can meet the long-wave infrared uncooled 1280 x 1024@12 mu m;
8) The total length of the light path is less than or equal to 75.4mm, and the optical back intercept is 8mm.
The present invention is a wide angle lens specially developed for small focal length and large field of view, the angle of view of which is 67.5 DEG.54.6 DEG.44.5 DEG, the field of view is obviously enlarged, in addition, the difficulty of the lens is that the distortion of the lens under small focal length is controlled, and the distortion of the lens is controlled within 0.55% according to the distortion curve of the lens, thus realizing high quality imaging without distortion.
On the basis of the above, as a further improvement of the present invention, curved surfaces of the first lens 1, the second lens 2, the third lens 3, and the fourth lens 4 in the object-side to image-side directions are respectively denoted by S1, S2, S3, S4, S5, S6, S7, and S8 (see fig. 1); the thickness of the center of the first lens is 15.2mm, the thickness of the center of the second lens is 9.25mm, the thickness of the center of the third lens is 4.73mm, and the thickness of the center of the fourth lens is 3.1mm; s1, S2, S3, S4, S5, S6, S7 are aspherical lenses, and S8 is a spherical lens.
Specific detailed parameters of the optical elements formed by the first lens 1, the second lens 2, the third lens 3 and the fourth lens 4 are shown in table 1, wherein S1, S2, S3, S4 and S5 represent the left surface parameters of the positive lens 1, the negative lens 2 and the focal plane 3 of the infrared detector in sequence, and the specific detailed optical data are shown in table 1-1.
TABLE 1-1
The aspherical lens curves in the first lens, the second lens, the third lens and the fourth lens satisfy the following equation expression:
wherein z is the distance vector height of the aspheric surface from the vertex of the aspheric surface when the aspheric surface reaches the height r along the optical axis direction;
c, curvature of the aspheric vertex;
k: cone coefficient (constant);
r radial distance;
A 4 、A 6 、A 8 expressed as higher order aspheric coefficients.
The coefficients are shown in table 2 below:
TABLE 2
The MTF curve of the ultra-high resolution wide angle infrared lens at 20 ℃ is shown in figure 2. As can be seen from the graph, the MTF values of the lens are all larger than 0.15, the imaging contrast of the lens is high, and the imaging quality of the image is good. Fig. 3 is a graph of lens curve length and distortion. As can be seen from the figure, the optical distortion of the system is <1.1% and gives good image imaging quality under distortion.
Fig. 4 and 5 are MTF graphs and distortion graphs at 13mm focal length, the 13mm MTF value is > 0.2, the lens distortion is <1.8%, the 15mm lens distortion is obviously better than 13mm, and the imaging quality is higher.
Finally, it is noted that the above-mentioned preferred embodiments illustrate rather than limit the invention, and that, although the invention has been described in detail with reference to the above-mentioned preferred embodiments, it will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the scope of the invention as defined by the appended claims.
Claims (7)
1. The utility model provides an ultra-high resolution wide angle infrared lens which characterized in that: the first lens, the second lens, the third lens and the fourth lens are sequentially arranged from the object side to the image side along the optical axis, the first lens, the second lens and the fourth lens are all meniscus lenses with convex surfaces facing the object side, and the third lens is a meniscus lens with concave surfaces facing the object side.
2. The ultra-high resolution wide-angle infrared lens as set forth in claim 1, wherein: the size between the lenses along the optical axis direction of the wide-angle infrared lens under the 15mm focal length is as follows: the air interval between the first lens and the second lens is 24.25mm, and the air interval between the second lens and the third lens is 16.25mm; the air interval between the third lens and the fourth lens is 10mm; the distance between the fourth lens and the focal plane of the infrared detector is 11.88mm.
3. The ultra-high resolution wide-angle infrared lens as set forth in claim 1, wherein: focal length f of first lens 1 Less than or equal to-43.27 mm, focal length f of second lens 2 38.21mm or less, focal length f of third lens 3 55.29mm or less, of a fourth lensFocal length f 4 The focal length f of the whole optical system formed by the first lens, the second lens, the third lens and the fourth lens is less than or equal to 23.96mm and less than or equal to 15mm.
4. The ultra-high resolution wide-angle infrared lens as set forth in claim 1, wherein: curved surfaces of the first lens element, the second lens element, the third lens element and the fourth lens element in the object-side to image-side directions are respectively denoted by S1, S2, S3, S4, S5, S6, S7 and S8; the thickness of the center of the first lens is 15.2mm, the thickness of the center of the second lens is 9.25mm, the thickness of the center of the third lens is 4.73mm, and the thickness of the center of the fourth lens is 3.1mm; the radius of curvature of S1 is 24.872628mm, the radius of curvature of S2 is 17.987316mm, the radius of curvature of S3 is 23.892824mm, the radius of curvature of S4 is 28.098396mm, the radius of curvature of S5 is 67.287643, the radius of curvature of S6 is 50.760981, the radius of curvature of S7 is 73.456739, and S8 is a plane.
5. The ultra-high resolution wide-angle infrared lens as set forth in claim 1 or 4, wherein: s1, S2, S3, S4, S5, S6, S7 are aspherical lenses, and S8 is a spherical lens.
6. The ultra-high resolution wide-angle infrared lens as set forth in claim 4 or 5, wherein: the aspherical lens curves in the first lens, the second lens, the third lens and the fourth lens satisfy the following equation expression:
wherein z is the distance vector height of the aspheric surface from the vertex of the aspheric surface when the aspheric surface reaches the height r along the optical axis direction; c, curvature of the aspheric vertex; k: conical surface coefficient Conicoconstant; r radial distance;A 4 、A 6 、A 8 expressed as higher order aspheric coefficients.
7. The ultra-high resolution wide-angle infrared lens as set forth in claim 1, wherein: the first lens, the second lens, the third lens and the fourth lens are all made of germanium materials.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310323203.3A CN116540388A (en) | 2023-03-29 | 2023-03-29 | Ultra-high resolution wide-angle infrared lens |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202310323203.3A CN116540388A (en) | 2023-03-29 | 2023-03-29 | Ultra-high resolution wide-angle infrared lens |
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| CN116540388A true CN116540388A (en) | 2023-08-04 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116909001A (en) * | 2023-07-14 | 2023-10-20 | 云南驰宏国际锗业有限公司 | High-resolution long-focus infrared sighting telescope |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20140111850A1 (en) * | 2011-06-24 | 2014-04-24 | Zhejiang Sunny Optics Co., Ltd. | Near infrared lens |
| CN213599024U (en) * | 2020-11-16 | 2021-07-02 | 云南驰宏国际锗业有限公司 | Camera lens clamping device for infrared temperature measurement of electric control cabinet |
| TW202129347A (en) * | 2020-01-20 | 2021-08-01 | 紘立光電股份有限公司 | Optical imaging lens, imaging device and electronic device |
| CN114967061A (en) * | 2022-06-15 | 2022-08-30 | 安徽光智科技有限公司 | Large-target-surface low-distortion athermal infrared lens |
-
2023
- 2023-03-29 CN CN202310323203.3A patent/CN116540388A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20140111850A1 (en) * | 2011-06-24 | 2014-04-24 | Zhejiang Sunny Optics Co., Ltd. | Near infrared lens |
| TW202129347A (en) * | 2020-01-20 | 2021-08-01 | 紘立光電股份有限公司 | Optical imaging lens, imaging device and electronic device |
| CN213599024U (en) * | 2020-11-16 | 2021-07-02 | 云南驰宏国际锗业有限公司 | Camera lens clamping device for infrared temperature measurement of electric control cabinet |
| CN114967061A (en) * | 2022-06-15 | 2022-08-30 | 安徽光智科技有限公司 | Large-target-surface low-distortion athermal infrared lens |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116909001A (en) * | 2023-07-14 | 2023-10-20 | 云南驰宏国际锗业有限公司 | High-resolution long-focus infrared sighting telescope |
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