CN104459958A - Prime lens used for infrared camera - Google Patents
Prime lens used for infrared camera Download PDFInfo
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- CN104459958A CN104459958A CN201410830596.8A CN201410830596A CN104459958A CN 104459958 A CN104459958 A CN 104459958A CN 201410830596 A CN201410830596 A CN 201410830596A CN 104459958 A CN104459958 A CN 104459958A
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- spherical lens
- single positive
- minute surface
- lens
- positive non
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- 238000003384 imaging method Methods 0.000 claims abstract description 25
- 230000003287 optical effect Effects 0.000 claims abstract description 21
- 229910052732 germanium Inorganic materials 0.000 claims abstract description 9
- GNPVGFCGXDBREM-UHFFFAOYSA-N germanium atom Chemical compound [Ge] GNPVGFCGXDBREM-UHFFFAOYSA-N 0.000 claims abstract description 9
- 230000000694 effects Effects 0.000 abstract description 5
- 238000004519 manufacturing process Methods 0.000 abstract description 2
- 238000003754 machining Methods 0.000 abstract 1
- 230000004075 alteration Effects 0.000 description 4
- 238000012546 transfer Methods 0.000 description 4
- 230000005499 meniscus Effects 0.000 description 2
- 238000012545 processing Methods 0.000 description 2
- 230000004304 visual acuity Effects 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000005286 illumination Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012544 monitoring process Methods 0.000 description 1
- 230000001737 promoting effect Effects 0.000 description 1
- 238000005057 refrigeration Methods 0.000 description 1
- 230000035945 sensitivity Effects 0.000 description 1
- 238000001931 thermography Methods 0.000 description 1
- 238000009827 uniform distribution Methods 0.000 description 1
- 230000000007 visual effect Effects 0.000 description 1
Classifications
-
- 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
- G02B1/00—Optical elements characterised by the material of which they are made; Optical coatings for optical elements
-
- 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
- G02B13/18—Optical objectives specially designed for the purposes specified below with lenses having one or more non-spherical faces, e.g. for reducing geometrical aberration
Abstract
The invention relates to the technical field of infrared cameras and discloses a prime lens used for an infrared camera. The prime lens used for the infrared camera comprises a first single positive aspheric lens, a second single negative spherical lens, a third single positive aspheric lens, a fourth single positive spherical lens and a diaphragm arranged between the second single negative spherical lens and the third single positive aspheric lens, wherein the first single positive aspheric lens, the second single negative spherical lens, the third single positive aspheric lens and fourth single positive spherical lens are sequentially arranged on the same optical axis; the first single positive aspheric lens and the third single positive aspheric lens are order-10 positive aspheric lenses; the first single positive aspheric lens, the second single negative spherical lens, the third single positive aspheric lens and the fourth single positive spherical lens are made of germanium materials. The first single positive aspheric lens and the third single positive aspheric lens are designed according to order-10 aspheric parameters, and the first single positive aspheric lens, the second single negative spherical lens, the third single positive aspheric lens and the fourth single positive spherical lens are all made of germanium materials, so that the prime lens used for the infrared camera is simple in structure and convenient to manufacture, improves the imaging effect and reduces the machining difficulty.
Description
Technical field
The present invention relates to infrared camera technical field, in particular, particularly a kind of tight shot for infrared camera.
Background technology
In fields such as medical treatment, industry, infrared monitoring and fire-fightings, infrared camera is often utilized to carry out imaging to the far infrared of about 10000nm wavelength.As the tight shot for infrared camera in the past, mostly adopt refrigeration type infrared detector, but widely using along with non-refrigerated infrared detector, be necessary the tight shot for infrared camera designing a kind of little F value, object lens of large relative aperture.
Summary of the invention
The object of the present invention is to provide that a kind of structure is simple, easy to make, imaging effect is good, cost of manufacture is low, can form imaging clearly by infrared ray and carry out the suitable focusing single-focusing tight shot for infrared camera in outside being used in infrared thermography, monitor camera, this tight shot is applicable to the infrared ray of wavelength coverage 8000nm ~ 14000nm.
The present invention is in order to solve problem set forth above, and this system adopts four-piece type near symmetrical structure, and arranges diaphragm in centre, and eyeglass is meniscus lens and adds aspheric surface, and material all adopts the germanium material of high index of refraction.Eyeglass adopts meniscus lens and forms the aberration that symmetrical structure effectively can reduce system, improves image quality; System aberration also effectively can be reduced in stop position, reduces distortion, improves image quality further; Add aspheric surface and while minimizing system aberration, effectively can shorten system length, reduce costs; Material aspect adopts the germanium material of high index of refraction, more easily realizes the requirement of little F value, object lens of large relative aperture while simplifying system.
The present invention solve the problem adopt technical scheme be: a kind of tight shot for infrared camera, comprise and be located at the single positive non-spherical lens of first on same optical axis successively, second single negative spherical lens, 3rd single positive non-spherical lens and the 4th single positive spherical lens, and the diaphragm be located between second single negative spherical lens and the 3rd single positive non-spherical lens, described first single positive non-spherical lens and the 3rd single positive non-spherical lens all adopt the ten positive non-spherical lenses in rank, and described first single positive non-spherical lens, second single negative spherical lens, 3rd single positive non-spherical lens and the 4th single positive spherical lens all adopt germanium material.
According to a preferred embodiment of the invention: described first single positive non-spherical lens is provided with the first minute surface and the second minute surface, described second single negative spherical lens is provided with the 3rd minute surface and the 4th minute surface, described 3rd single positive non-spherical lens is provided with the 5th minute surface and the 6th minute surface, described 4th single positive spherical lens is provided with the 7th minute surface and the 8th minute surface, described first minute surface and the second minute surface are thing end face and the imaging end face of first single positive non-spherical lens, described 3rd minute surface and the 4th minute surface are thing end face and the imaging end face of second single negative spherical lens, described 5th minute surface and the 6th minute surface are thing end face and the imaging end face of the 3rd single positive non-spherical lens, described 7th minute surface and the 8th minute surface are thing end face and the imaging end face of the 4th single positive spherical lens, described first minute surface and the 6th minute surface adopt the aspheric surface parameter designing of ten rank coefficients, and adopt the asphericity coefficient of two items.
According to a preferred embodiment of the invention: described tight shot satisfies condition: F/NO.=0.85, f=17mm;
Wherein, F/NO. is the f-number of camera lens, and f is the effective focal length of camera lens.
According to a preferred embodiment of the invention: the first minute surface of described first single positive non-spherical lens and the 6th minute surface of the 3rd single positive non-spherical lens are order aspherical coefficients.
According to a preferred embodiment of the invention: the asphericity coefficient of described first single positive non-spherical lens and the 3rd single positive non-spherical lens meets equation:
；
Wherein,
for aspheric sag value, Y is the distance between lens face to optical axis, and C is curvature, and k is circular cone coefficient.
According to a preferred embodiment of the invention: the Refractive Index of Material of described first single positive non-spherical lens, second single negative spherical lens, the 3rd single positive non-spherical lens and the 4th single positive spherical lens is 4.0043.
Compared with prior art, beneficial effect of the present invention is: the single positive non-spherical lens of first in the present invention and the 3rd single positive non-spherical lens adopt the aspheric surface parameter designing on ten rank, and first single positive non-spherical lens, second single negative spherical lens, the 3rd single positive non-spherical lens and the 4th single positive spherical lens all use germanium material, not only structure is simple, easy to make, and improve imaging effect, reduce difficulty of processing.
Accompanying drawing explanation
In order to be illustrated more clearly in the embodiment of the present invention or technical scheme of the prior art, be briefly described to the accompanying drawing used required in embodiment or description of the prior art below, apparently, accompanying drawing in the following describes is only some embodiments of the present invention, for those of ordinary skill in the art, under the prerequisite not paying creative work, other accompanying drawing can also be obtained according to these accompanying drawings.
Fig. 1 is the optical cross section figure of the tight shot for infrared camera of the present invention when object distance is infinite distance.
Fig. 2 be the tight shot for infrared camera of the present invention object distance be infinite distance, resolving power at 20lp/mm time optical transfer function (MTF) figure.
Fig. 3 is the curvature of field figure of the tight shot for infrared camera of the present invention when object distance is infinite distance and distortion figure.
Fig. 4 is the relative exposure figure of the tight shot for infrared camera of the present invention when object distance is infinite distance.
Description of reference numerals: 1, first single positive non-spherical lens, 2, second single negative spherical lens, the 3, the 3rd single positive non-spherical lens, 4, the 4th single positive spherical lens, A, diaphragm, r1, the first minute surface, r2, the second minute surface, r3, the 3rd minute surface, r4, the 4th minute surface, r5, the 5th minute surface, r6, the 6th minute surface, r7, the 7th minute surface, r8, the 8th minute surface.
Embodiment
Below in conjunction with accompanying drawing, the preferred embodiments of the present invention are described in detail, can be easier to make advantages and features of the invention be readily appreciated by one skilled in the art, thus more explicit defining is made to protection scope of the present invention.
Consult shown in Fig. 1, the invention provides a kind of tight shot for infrared camera, comprise and be located at the single positive non-spherical lens 1 of first on same optical axis successively, second single negative spherical lens 2, 3rd single positive non-spherical lens 3 and the 4th single positive spherical lens 4, and the diaphragm A(diaphragm be located between second single negative spherical lens 2 and the 3rd single positive non-spherical lens 3 can control to enter the light of optical system and effectively reduce aberration, improving image quality) just non-spherical lens 1 and the 3rd single positive non-spherical lens 3 all adopt the ten positive non-spherical lenses in rank to described first list, and adopt the asphericity coefficient of two items, contribute to promoting image quality, reduce lens length.And the single negative spherical lens 2 of described first single positive non-spherical lens 1, second, the 3rd single positive non-spherical lens 3 and the 4th single positive spherical lens 4 all adopt germanium material.
The single positive non-spherical lens 1 of in the present invention first is provided with the first minute surface r1 and the second minute surface r2, described second single negative spherical lens 2 is provided with the 3rd minute surface r3 and the 4th minute surface r4, described 3rd single positive non-spherical lens 3 is provided with the 5th minute surface r5 and the 6th minute surface r6, described 4th single positive spherical lens 4 is provided with the 7th minute surface r7 and the 8th minute surface r8, described first minute surface r1 and the second minute surface r2 is thing end face and the imaging end face of first single positive non-spherical lens 1, described 3rd minute surface r3 and the 4th minute surface r4 is thing end face and the imaging end face of second single negative spherical lens 2, described 5th minute surface r5 and the 6th minute surface r6 is thing end face and the imaging end face of the 3rd single positive non-spherical lens 3, described 7th minute surface r7 and the 8th minute surface r8 is thing end face and the imaging end face of the 4th single positive spherical lens 4, described first minute surface r1 and the 6th minute surface r6 adopts the aspheric surface parameter designing of ten rank coefficients, and adopt the asphericity coefficient of two items.
Tight shot of the present invention adopt large aperture and also effective focal length shorter, this tight shot satisfies condition: F/NO.=0.85, f=17mm; Wherein, F/NO. is the f-number of camera lens, and f is the effective focal length of camera lens, clapped image can be made more clear bright, have larger field angle.
Following table 1 has enumerated the parameter value of the every lens of the tight shot for infrared camera of the present invention successively.
Table 1
The single positive non-spherical lens 1 of in the present invention first, the 3rd single positive non-spherical lens 3 are the ten positive non-spherical lenses in rank, and its asphericity coefficient meets following equation:
；
Be wherein
aspheric sag value, i.e. aspheric depression degree, Y is the distance between lens face to optical axis, and C is curvature, and k is circular cone coefficient.This aspheric order aspherical coefficients is listed in table 2 successively.
Table 2
Wherein, the first minute surface r1 represents the thing end face of described first single positive non-spherical lens 1, and the 6th minute surface r6 represents the picture end face of the described 3rd single positive non-spherical lens 3, and both are all adopted as order aspherical coefficients.
The optical characteristics rule of the infrared tight shot being the present embodiment with following table 3.
Table 3
In table 3, TTL represents the distance from the forward end apex of lens to imaging surface, and the overall length of this camera lens is 34.5mm.F value represents the ratio of effective focal length and aperture diaphragm size, and general F value is less, and shooting imaging is more limpid in sight, and this camera lens F value is 0.85, and imaging effect is limpid in sight.EFL(effective focal length) represent the effective focal length size of the reality of optical system, this camera lens is in guarantee EFL(effective focal length) for 17mm is less, when F value is also little, the real scene shooting effect of Large visual angle high imaging quality can be obtained.Maximum image height represent object after optical system become maximum image planes diameter of a circle, maximum image height is 12mm, can mate 384x288, the detector of 25 μm of sizes.
Please refer to shown in Fig. 2, for tight shot object distance be infinite distance time, resolving power is at optical transfer function (MTF) figure of 20lp/mm.Wherein incident ray wavelength is 8 μm-12 μm.T represents the meridional ray (Tangential Ray) of incident light, and S represents the sagittal ray (Sagittal Ray) of incident light, and horizontal ordinate representation space cutoff frequency value, ordinate represents the value of optical transfer function (MTF).Curve is when 20lp/mm ends, and the mean value that optical transfer function (MTF) is corresponding is greater than 0.65, therefore, can find out that the present invention has good optical resolution for the tight shot of infrared camera.
Please refer to shown in Fig. 3, be the curvature of field of tight shot when object distance is infinite distance and distortion figure, in Fig. 3, the functional arrangement in left side is curvature of field figure, right side be distortion figure.In curvature of field figure, horizontal ordinate is the distance of imaging point apart from desirable image planes, and ordinate is desirable image height or the angle of incident ray.In distortion figure, horizontal ordinate is the percent difference of imaging point to ideal point, and ordinate is desirable image height or the angle of incident ray.The maximum curvature of field of the present embodiment is-0.3% in 0.07 millimeter, maximum distortion, and numerical value is all very little, and imaging is overall clear without distortion.
Please refer to shown in Fig. 4, is relative exposure (Relative Illumination) figure of tight shot.Wherein horizontal ordinate represents desirable image height or the angle of incident ray, and ordinate represents the ratio of normalized edge relative centre.The edge brightness at the present embodiment maximum desired image height place is greater than 82% relative to center brightness ratio, and the overall image planes brightness of imaging is very consistent, produces without dark angle.
After have employed the tight shot for infrared camera of the present invention design, it is by tolerance sensitivities uniform distribution, and first single positive non-spherical lens 1 and the 3rd single positive non-spherical lens 3 all adopt the aspherics parameter designing of ten rank coefficients, the tight shot for infrared camera of the present invention is made to decrease the length of optical system, improve the image quality of optical system, reduce cost; Four pieces of lens all adopt germanium material, under the prerequisite ensureing image quality, effectively reduce aspheric surface quantity, reduce the difficulty of processing further.
Infrared tight shot of the present invention is when adopting the optical parametric of the present embodiment, and the overall length of camera lens is 34.5 millimeters (mm), and F value is only 0.85, greatly improves the image quality of optical system.
Above-described embodiment is the present invention's preferably embodiment; but embodiments of the present invention are not restricted to the described embodiments; change, the modification done under other any does not deviate from Spirit Essence of the present invention and principle, substitute, combine, simplify; all should be the substitute mode of equivalence, be included within protection scope of the present invention.
Claims (6)
1. the tight shot for infrared camera, it is characterized in that: comprise and be located at the single positive non-spherical lens (1) of first on same optical axis successively, second single negative spherical lens (2), 3rd single positive non-spherical lens (3) and the 4th single positive spherical lens (4), and the diaphragm (A) be located between second single negative spherical lens (2) and the 3rd single positive non-spherical lens (3), described first single positive non-spherical lens (1) and the 3rd single positive non-spherical lens (3) all adopt the ten positive non-spherical lenses in rank, and described first single positive non-spherical lens (1), second single negative spherical lens (2), 3rd single positive non-spherical lens (3) and the 4th single positive spherical lens (4) all adopt germanium material.
2. the tight shot for infrared camera according to claim 1, it is characterized in that: described first single positive non-spherical lens (1) is provided with the first minute surface (r1) and the second minute surface (r2), described second single negative spherical lens (2) is provided with the 3rd minute surface (r3) and the 4th minute surface (r4), described 3rd single positive non-spherical lens (3) is provided with the 5th minute surface (r5) and the 6th minute surface (r6), described 4th single positive spherical lens (4) is provided with the 7th minute surface (r7) and the 8th minute surface (r8), described first minute surface (r1) and the second minute surface (r2) are thing end face and the imaging end face of first single positive non-spherical lens (1), described 3rd minute surface (r3) and the 4th minute surface (r4) are thing end face and the imaging end face of second single negative spherical lens (2), described 5th minute surface (r5) and the 6th minute surface (r6) are thing end face and the imaging end face of the 3rd single positive non-spherical lens (3), described 7th minute surface (r7) and the 8th minute surface (r8) are thing end face and the imaging end face of the 4th single positive spherical lens (4), described first minute surface (r1) and the 6th minute surface (r6) adopt the aspheric surface parameter designing of ten rank coefficients, and adopt the asphericity coefficient of two items.
3. the tight shot for infrared camera according to claim 1, is characterized in that: described tight shot satisfies condition: F/NO.=0.85, f=17mm;
Wherein, F/NO. is the f-number of camera lens, and f is the effective focal length of camera lens.
4. the tight shot for infrared camera according to claim 2, is characterized in that: first minute surface (r1) of described first single positive non-spherical lens (1) and the 6th minute surface (r6) of the 3rd single positive non-spherical lens (3) are order aspherical coefficients.
5. the tight shot for infrared camera according to claim 1, is characterized in that: the asphericity coefficient of described first single positive non-spherical lens (1) and the 3rd single positive non-spherical lens (3) meets equation:
Wherein,
for aspheric sag value, Y is the distance between lens face to optical axis, and C is curvature, and k is circular cone coefficient.
6. the tight shot for infrared camera according to claim 1, is characterized in that: the Refractive Index of Material of described first single positive non-spherical lens (1), second single negative spherical lens (2), the 3rd single positive non-spherical lens (3) and the 4th single positive spherical lens (4) is 4.0043.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410830596.8A CN104459958B (en) | 2014-12-27 | 2014-12-27 | Prime lens used for infrared camera |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410830596.8A CN104459958B (en) | 2014-12-27 | 2014-12-27 | Prime lens used for infrared camera |
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| CN104459958A true CN104459958A (en) | 2015-03-25 |
| CN104459958B CN104459958B (en) | 2017-05-03 |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105093487A (en) * | 2015-07-29 | 2015-11-25 | 深圳乐行天下科技有限公司 | Near infrared optical lens |
| CN112180572A (en) * | 2020-09-30 | 2021-01-05 | 中国科学院西安光学精密机械研究所 | Refrigeration type medium wave infrared athermal optical lens |
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| CN2833632Y (en) * | 2005-11-17 | 2006-11-01 | 中国科学院西安光学精密机械研究所 | Medium wave infrared tracking and measuring objective lens |
| CN200959046Y (en) * | 2006-09-22 | 2007-10-10 | 肯顺科技股份有限公司 | Infrared radiant light-source diffuser and monitoring camera appliances therewith |
| CN100543509C (en) * | 2004-08-20 | 2009-09-23 | 鸿富锦精密工业（深圳）有限公司 | Digital camera lens |
| CN101666902A (en) * | 2008-09-05 | 2010-03-10 | 中山联合光电科技有限公司 | Small-distortion, small-volume, high-illumination and high-resolution optical system |
| CN103185956A (en) * | 2011-12-27 | 2013-07-03 | 亚洲光学股份有限公司 | Miniature projection lens |
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2014
- 2014-12-27 CN CN201410830596.8A patent/CN104459958B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100543509C (en) * | 2004-08-20 | 2009-09-23 | 鸿富锦精密工业（深圳）有限公司 | Digital camera lens |
| CN2833632Y (en) * | 2005-11-17 | 2006-11-01 | 中国科学院西安光学精密机械研究所 | Medium wave infrared tracking and measuring objective lens |
| CN200959046Y (en) * | 2006-09-22 | 2007-10-10 | 肯顺科技股份有限公司 | Infrared radiant light-source diffuser and monitoring camera appliances therewith |
| CN101666902A (en) * | 2008-09-05 | 2010-03-10 | 中山联合光电科技有限公司 | Small-distortion, small-volume, high-illumination and high-resolution optical system |
| CN103185956A (en) * | 2011-12-27 | 2013-07-03 | 亚洲光学股份有限公司 | Miniature projection lens |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105093487A (en) * | 2015-07-29 | 2015-11-25 | 深圳乐行天下科技有限公司 | Near infrared optical lens |
| CN105093487B (en) * | 2015-07-29 | 2020-09-04 | 深圳乐行天下科技有限公司 | Near-infrared optical lens |
| CN112180572A (en) * | 2020-09-30 | 2021-01-05 | 中国科学院西安光学精密机械研究所 | Refrigeration type medium wave infrared athermal optical lens |
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| CN104459958B (en) | 2017-05-03 |
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