CN104101986A - Infrared fish-eye camera lens - Google Patents
Infrared fish-eye camera lens Download PDFInfo
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- CN104101986A CN104101986A CN201410378984.7A CN201410378984A CN104101986A CN 104101986 A CN104101986 A CN 104101986A CN 201410378984 A CN201410378984 A CN 201410378984A CN 104101986 A CN104101986 A CN 104101986A
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- lens
- fish eye
- infrared fish
- combination
- focal length
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Abstract
An infrared fish-eye camera lens comprises a lens assembly and is characterized in that the lens assembly is formed by a first lens, a second lens, a third lens and a fourth lens which are coaxial; the first lens is a spherical negative lens with a convex side facing an object; the second lens is an aspheric surface lens; the first lens and the second lens form into a front assembly of lenses; the third lens is a positive lens with the concave side facing the object; the fourth lens is a positive lens with the concave side facing an image; the convex sides of the third lens and the fourth lens form into a diffraction lens in a back-to-back mode; the focal length of the front assembly of the lenses is minus 27.916 mm; the focal length of the diffraction lens is 18.95 mm. The infrared fish-eye camera lens has the advantages of being simple in system structure, small in size, large in rear working distance and good in imaging quality and enabling a modulation transfer function value at the cut-off frequency 111 p/mm to be larger than 0.5.
Description
Technical field
The design relates to infrared fish eye lens, belongs to optical technical field.
Background technology
The special lens that fish eye lens can reach more than 200b as a kind of field angle is that modern science and technology field is needed, but being off-axis aberration, the problem that the infrared FISH EYE LENS OPTICS system of super wide-angle faces is difficult to eliminate, image planes edge illumination is too low, and traditional optical system structure complexity, eyeglass quantity cause more, and system transmitance is low, systemic resolution is also low.
Utilize the optical system of rolling over the hybrid element development of spreading out, because diffraction optical element has Negative Dispersion Properties, negative temperature characteristic, can realize the arbitrary phase modulation to light wave face, coordinate with refracting element, improving system imaging quality, reduce system bulk and weight and the aspect such as reduce costs to there is unrivaled advantage, thereby make the infrared FISH EYE LENS OPTICS system that designs large visual field there is feasibility.
Summary of the invention
For above-mentioned requirements, the design's object is off-axis aberration and the edge illuminance of image plane problem that solves bugeye lens, and a kind of infrared fish eye lens is provided.
For achieving the above object, the design realizes by following technological means:
A kind of infrared fish eye lens, comprises lens combination, it is characterized in that: described lens combination is made up of coaxial first lens, the second lens, the 3rd lens, the 3rd lens; Described first lens is the sphere negative lens of convex surface towards thing, and described the second lens are aspheric surface negative lens, and described first lens, the second lens form front group of lens; Described the 3rd lens are the diffraction positive lens of concave surface towards thing, and described the 4th lens are the positive lens of concave surface towards picture, group lens after the convex surface of described the 3rd lens, the 4th lens forms back-to-back together; The focal length of described front group of lens is-27.916mm that the focal length of described rear group of lens is 18.95mm.
Preferred:
The infrared fish eye lens of described one, is characterized in that: the focal length of described lens combination is 5mm, and the F number of described lens combination is 2.
The infrared fish eye lens of described one, is characterized in that: the back work distance of described lens combination is from being 28.5mm.
The infrared fish eye lens of described one, is characterized in that: described front group of power of lens is-0.16, and described rear group of power of lens is 0.386.
The infrared fish eye lens of described one, is characterized in that: the spectral range of described lens combination is 8-12 μ m.
The infrared fish eye lens of described one, is characterized in that: described lens combination overall length is 157.8mm.
The invention has the beneficial effects as follows: the design adopts anti-long distance structure, can solve well off-axis aberration and the edge illuminance of image plane problem of bugeye lens.Result shows: system architecture is simple, and volume is very little, back work distance is from greatly, and good imaging quality, is greater than 0.5 at the modulating transfer function value at cutoff frequency 11 lp/mm places.
Brief description of the drawings
Fig. 1 is lens combination composition structural representation.
The implication of drawing reference numeral is as follows: 1 first lens, 2 second lens, 3 the 3rd lens, 4 the 4th lens.
Embodiment
Below in conjunction with Figure of description, design is further described.
As shown in Figure 1, a kind of infrared fish eye lens, comprises lens combination, it is characterized in that: described lens combination is made up of coaxial first lens 1, the second lens 2, the 3rd lens 3, the 3rd lens 4; Described first lens 1 is the sphere negative lens of convex surface towards thing, and described the second lens 2 are aspheric surface negative lens, group lens before described first lens 1, the second lens 2 form; Described the 3rd lens 3 are the diffraction positive lens of concave surface towards thing, and described the 4th lens 4 are the positive lens of concave surface towards picture, group lens before the convex surface of described the 3rd lens 3, the 4th lens 4 forms back-to-back together; The focal length of described front group of lens is-27.916mm that the focal length of described rear group of lens is 18.95mm.
Preferred:
The infrared fish eye lens of described one, is characterized in that: the focal length of described lens combination is 5mm, and the F number of described lens combination is 2.
The infrared fish eye lens of described one, is characterized in that: the back work distance of described lens combination is from being 28.5mm.
The infrared fish eye lens of described one, is characterized in that: described front group of power of lens is-0.16, and described rear group of power of lens is 0.386.
The infrared fish eye lens of described one, is characterized in that: the spectral range of described lens combination is 8-12 μ m.
In infrared fish-eye Optical System Design, because of the singularity of its material, require the optical system structure of design can not be too complicated, eyeglass quantity can not be too many, this has higher requirement also to the design of corresponding optical system.In native system, in refracting element, introduce diffraction surfaces and form refraction/diffraction mixed optical system, utilize diffraction element can realize the characteristic of the arbitrary phase modulation to light wave face, designed system is simplified.
Fish-eye design adopts retrofocus type optical texture, and this system is made up of four lens, comprises one
Individual aspheric surface and a diffraction surfaces.Image space principal plane is positioned at camera lens outside, has long reach.The focal power of camera lens front optical module is for negative, the focal power of rear mirror group is just. after off-axis ray passes through dispersing of front group of negative lens, the angle of itself and optical axis is obviously diminished, be conducive to the aberration correction of rear set of pieces, adopt and instead take the photograph structure far away and produce large barrel distortion because organizing negative power before it, field angle of image is reduced, can effectively slow down edge illumination and decline, illuminance of image plane is more even.
The design follows the technology parameter according to Long Wave Infrared Probe, and designing a focal length is 5 mm, the optical system that F number is 2.Spectral range is 8 ~ 12 μ m, centre wavelength 10 μ m.The focal length of described first lens 1 is-27.916mm that the focal length of described diffraction lens is 18.95mm.System focal length is 5 mm.The focal power of described first lens is-0.16, and the focal power of described diffraction lens is 0.386.Full visual field is 240 °, and back work distance is from being 28. 5 mm.Experimental result shows that this system architecture is simple, and volume is little, back work distance is from greatly, and good imaging quality, meets design requirement.In civilian, frontier defense, national defence and military affairs, be all widely used.
More than show and described the design's ultimate principle, principal character and advantage.The technician of the industry should understand; the design is not restricted to the described embodiments; the principle that the design is just described of describing in above-described embodiment and instructions; do not departing under the prerequisite of the design's spirit and scope; the design also has various changes and modifications, and these changes and improvements all fall within the scope of claimed the design.The claimed scope of the design is defined by appending claims and equivalent thereof.
Claims (6)
1. an infrared fish eye lens, comprises lens combination, it is characterized in that: described lens combination is made up of coaxial first lens, the second lens, the 3rd lens, the 3rd lens; Described first lens is the sphere negative lens of convex surface towards thing, and described the second lens are aspheric surface negative lens, and described first lens, the second lens form front group of lens; Described the 3rd lens are the diffraction positive lens of concave surface towards thing, and described the 4th lens are the positive lens of concave surface towards picture, group lens after the convex surface of described the 3rd lens, the 4th lens forms back-to-back together; The focal length of described front group of lens is-27.916mm that the focal length of described rear group of lens is 18.95mm.
2. the infrared fish eye lens of one as claimed in claim 1, is characterized in that: the focal length of described lens combination is 5mm, and the F number of described lens combination is 2.
3. the infrared fish eye lens of one as claimed in claim 1, is characterized in that: the back work distance of described lens combination is from being 28.5mm.
4. the infrared fish eye lens of one as claimed in claim 1, is characterized in that: described front group of power of lens is-0.16, and described rear group of power of lens is 0.386.
5. the infrared fish eye lens of one as claimed in claim 1, is characterized in that: the spectral range of described lens combination is 8-12 μ m.
6. the infrared fish eye lens of one as claimed in claim 1, is characterized in that: described lens combination overall length is 157.8mm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410378984.7A CN104101986A (en) | 2014-08-04 | 2014-08-04 | Infrared fish-eye camera lens |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410378984.7A CN104101986A (en) | 2014-08-04 | 2014-08-04 | Infrared fish-eye camera lens |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN104101986A true CN104101986A (en) | 2014-10-15 |
Family
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201410378984.7A Pending CN104101986A (en) | 2014-08-04 | 2014-08-04 | Infrared fish-eye camera lens |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115616747A (en) * | 2022-12-20 | 2023-01-17 | 西安中科立德红外科技有限公司 | Medium wave infrared lens and detector |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5940224A (en) * | 1998-03-16 | 1999-08-17 | Nikon Corporation | Wide band infrared camera lens systems |
| JP2010032813A (en) * | 2008-07-29 | 2010-02-12 | Kyocera Corp | Optical device for camera mounted in vehicle |
| CN101681013A (en) * | 2007-06-12 | 2010-03-24 | 奥林巴斯株式会社 | Optical element, optical system, and endoscope using same |
| FR2930049B1 (en) * | 2008-04-15 | 2010-09-03 | Sagem Defense Securite | PASSIVE ATHERMALIZATION OBJECTIVE. |
| CN102591012A (en) * | 2011-01-06 | 2012-07-18 | 索尼公司 | Infrared optical system and infrared imaging apparatus |
| JP2013024892A (en) * | 2011-07-14 | 2013-02-04 | Konica Minolta Advanced Layers Inc | Image pickup lens and image pickup apparatus |
-
2014
- 2014-08-04 CN CN201410378984.7A patent/CN104101986A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5940224A (en) * | 1998-03-16 | 1999-08-17 | Nikon Corporation | Wide band infrared camera lens systems |
| CN101681013A (en) * | 2007-06-12 | 2010-03-24 | 奥林巴斯株式会社 | Optical element, optical system, and endoscope using same |
| FR2930049B1 (en) * | 2008-04-15 | 2010-09-03 | Sagem Defense Securite | PASSIVE ATHERMALIZATION OBJECTIVE. |
| JP2010032813A (en) * | 2008-07-29 | 2010-02-12 | Kyocera Corp | Optical device for camera mounted in vehicle |
| CN102591012A (en) * | 2011-01-06 | 2012-07-18 | 索尼公司 | Infrared optical system and infrared imaging apparatus |
| JP2013024892A (en) * | 2011-07-14 | 2013-02-04 | Konica Minolta Advanced Layers Inc | Image pickup lens and image pickup apparatus |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115616747A (en) * | 2022-12-20 | 2023-01-17 | 西安中科立德红外科技有限公司 | Medium wave infrared lens and detector |
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Application publication date: 20141015 |