CN102830484A - Wide-band confocal detection optical system with switchable band - Google Patents
Wide-band confocal detection optical system with switchable band Download PDFInfo
- Publication number
- CN102830484A CN102830484A CN2012100968884A CN201210096888A CN102830484A CN 102830484 A CN102830484 A CN 102830484A CN 2012100968884 A CN2012100968884 A CN 2012100968884A CN 201210096888 A CN201210096888 A CN 201210096888A CN 102830484 A CN102830484 A CN 102830484A
- Authority
- CN
- China
- Prior art keywords
- lens
- spherical lens
- optical system
- band
- spherical
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
Images
Landscapes
- Lenses (AREA)
Abstract
The invention relates to a wide-band confocal detection optical system with a switchable band. The confocal detection optical system is composed of five separate spherical lenses and parallel plate glass; the sequence of optical materials of the five separate spherical lenses is ZK10, ZF6, ZK6 (cemented doublet), LAF5, ZK6 and ZF6; the appearances of the five separate spherical lenses are sequentially a convex-concave positive lens, a negative and positive cemented doublet, the convex-concave positive lens, the convex-concave positive lens and a concave-convex negative lens; the parallel flat glass material is common glass K9; the parallel flat glass is arranged between a fifth shot and a CCD (charge coupled device) target surface; the used wave band is selected for switching the parallel flat glass, and a diaphragm is fixed between the third spherical lens and the fourth spherical lens. Compared with the traditional optical system, the technical problem that no confocal detection optical system with the switchable wide band exists at present is solved, and the wide-band confocal detection optical system has the characteristics of being low in cost, easy to ensure the machining precision and the like.
Description
[technical field]
The present invention relates to the confocal detection optical system of a kind of wide spectrum; Be specifically related to a kind of wide spectrum wave band at 450～950nm; The confocal optical system that spectral coverage can switch between 450nm～700nm and 760～950nm; Can be used as separate optical system and use, be particularly useful for the optical system of misty target detection.
[background technology]
Most of television imaging detection systems only respond into picture at visible light wave range, are only applicable to the target detection under the standard visibility atmospheric conditions.In the lower greasy weather of visibility, the atmospheric transmittance of visible light wave range sharply descends, and the target energy that causes whole detection system to receive descends, and directly has influence on Target Detection Ability of Infrared.For solving the detection problem of misty target, occurred the near infrared camera lens in recent years, but this camera lens is poor at the imaging effect of visible range, effectively do not utilize the responding ability of detector at visible light wave range.
Some camera lenses can both use at visible light and near-infrared band at present; But after taking into account visible light and near-infrared band, tangible focal shift can appear in common lens, and the focusing of having to is repeatedly adjusted; Just can obtain picture element clearly, bring very big inconvenience to the user.And adopt the confocal camera lens of wide spectrum can be implemented in whole visible light to near-infrared band, all be imaged on same focal plane.At present, this type of external camera lens mainly is through adopting special optical glass and face type, and all lens units are carried out special coating film treatment, realizes the purpose that wide spectrum is confocal, and cost is bigger.
[summary of the invention]
The purpose of this invention is to provide the confocal detection optical system of the changeable wide spectrum of a kind of wave band; Solved the technical matters of still not having the changeable confocal detection optical system of wide spectrum at present; Select for use glass material commonly used to realize the purpose that wide spectrum is confocal simultaneously; Not only reduce cost, and be easy to guarantee machining precision.
Technical scheme of the present invention is:
Technical solution of the present invention is following: the confocal detection optical system of the changeable wide spectrum of a kind of wave band is made up of spherical lens and a parallel plate glass of five separation; The optical material of five spherical lenses is in proper order: ZK10, ZF6 and ZK6 (cemented doublet), LAF5, ZK6; ZF6; The profile of five spherical lenses is followed successively by: first spherical lens is the convex-concave positive lens; Second spherical lens is that convex-concave positive lens, the 4th spherical lens are that convex-concave positive lens, the 5th spherical lens are concavo-convex negative lens for negative positive cemented doublet, the 3rd spherical lens, and the parallel plate glass material is simple glass K9, and parallel plate glass is between the 5th camera lens and CCD target surface; Select the wave band that uses, diaphragm to be fixed between the 3rd spherical lens and the 4th spherical lens through switching parallel plate glass;
Further; First spherical lens in the described confocal detection optical system, second spherical lens, the 3rd spherical lens are organized before forming optics; The 5th spherical lens, parallel plate glass are formed the back group; On first spherical lens, second spherical lens, the 3rd spherical lens, the 4th spherical lens, the 5th spherical lens, be coated with the 450-950nm anti-reflection film; On parallel plate glass, plate 450-700nm and 760-950nm anti-reflection film respectively, realize the switching of wave band through changing parallel flat.
Because the spectral band broad that uses carries out the correction of second order spectrum and aberration to system, carry out Theoretical Calculation and focal power distribution by the ultimate principle that second order spectrum is proofreaied and correct:
In the formula, P
F λRelative dispersion coefficient for optical material; n
F, n
CBe respectively the refractive index of the optical material that F light, C light calculates according to the formula in the condition (1); n
λBe the refractive index of optical material in af at wavelength lambda.
P, the V value of each glass that P, V formula are asked are brought the achromatism system of equations into, try to achieve basic focal power and distribute:
（2）
In the formula:
,
,
represent that respectively each power of lens, Abbe number and relative dispersion value, h1, h2, h3 are that the incident of light beam on lens is high; H1 is planned to 1 in the formula, finds the solution the rational focal power allocative decision in place with trial method.
Advantage of the present invention is:
⑴ it is 450-950nm that the present invention designs spectral coverage, and spectral band can carry out the wave band switching through changing optical filter between 450-700nm and 760-950nm.
⑵ near diffraction limit, and the near-infrared band disc of confusion is less than 4 μ m in the transport function of each spectral band for optical lens, and the visible light wave range disc of confusion is less than 6 μ m, and the system imaging quality is fine.
⑶ optical lens switches the back focal plane invariant position at visible light and near infrared spectrum, has solved the unsharp problem of imaging that different wave spectrums zone non-confocal causes, and not be used in the adjusting rear cut-off distance and just can make imaging clear, uses simple.
⑷ the relative aperture of optical system is big, and the contrast of system is better, enhanced system receive target emanation can, solve under low-light (level) or the greasy weather condition detection problem to target.
⑸ proofread and correct second order spectrum through apolegamy, lens radius and appropriate design at interval to glass material; Common focal power is not distributed the second order spectrum that disappears and need not adopt; For proofreading and correct other aberration the more freedom degree is provided, has made all aberrations of system obtain proofreading and correct.
⑹ lens combination is selected the conventional colouless optical glass pairing of four kinds of the Chinese trade mark for use, and material price is cheap, and mature production technology is ensured the quality of products easily.
[description of drawings]
Combine instance that the present invention is further described with reference to the accompanying drawings.
Fig. 1 is a structural representation of the present invention;
MTF on three visual fields of Fig. 2 near-infrared band of the present invention (760-950nm) is near the MTF figure of diffraction limit, in 80 MTF of lp/mm place >=0.7;
MTF on three visual fields of Fig. 3 visible light wave range of the present invention (450-700nm) is near the MTF figure of diffraction limit, in 80 MTF of lp/mm place >=0.7;
Point range figure on three visual fields of Fig. 4 near-infrared band of the present invention (760-950nm);
Point range figure on three visual fields of Fig. 5 visible light wave range of the present invention (450-700nm);
But Fig. 6 visible light near-infrared band of the present invention second order spectrum aberration correction figure.
[embodiment]
Consult shown in Figure 1; The confocal detection optical system of the changeable wide spectrum of a kind of wave band is made up of first spherical lens 1, second spherical lens 2, the 3rd spherical lens 3, the 4th spherical lens 4, the 5th spherical lens 5 and a parallel plate glass 6; The optical material of first spherical lens 1, second spherical lens 2, the 3rd spherical lens 3, the 4th spherical lens 4, the 5th spherical lens 5 is followed successively by in proper order: ZK10, ZF6 and ZK6 (cemented doublet), LAF5, ZK6; ZF6; First spherical lens 1 is the convex-concave positive lens simultaneously; Second spherical lens 2 is that convex-concave positive lens, the 4th spherical lens 4 are concavo-convex negative lens for convex-concave positive lens, the 5th spherical lens 5 for negative positive cemented doublet, the 3rd spherical lens 3; Parallel plate glass 6 materials are simple glass K9; Parallel plate glass 6 selects the wave band that uses, diaphragm 8 to be fixed between the 3rd spherical lens 3 and the 4th spherical lens 4 through switching parallel plate glass 6 between the 5th camera lens 5 and CCD target surface 7.Group before first spherical lens 1, second spherical lens 2,3 one-tenth optics of the 3rd spherical lens group; The 5th spherical lens 5, parallel plate glass 6 are formed the back group; On first spherical lens 1, second spherical lens 2, the 3rd spherical lens 3, the 4th spherical lens 4, the 5th spherical lens 5, be coated with the 450-950nm anti-reflection film, on parallel plate glass 6, plate 450-700nm and 760-950nm anti-reflection film respectively.
The optical lens material to choose the related constraint condition following:
In the formula, n (λ) is the refractive index of optical material in af at wavelength lambda; A, b, c are constant, and the value that the different optical material is corresponding is different.
In the formula,
Be simple lens picture side focal length; N is the refractive index that simple lens is selected optical material for use; r
1, r
2Be radius-of-curvature before and after the simple lens; D is a simple lens thickness.
In the formula, f is the combination object space focal length of two optical group; f
1, f
2Be respectively the object space focal length of two optical group; △ is the distance of the first optical group rear focus to the second optical group focus in object space.
In the formula, P
F λRelative dispersion coefficient for optical material; n
F, n
CBe respectively the refractive index of the optical material that F light, C light calculates according to the formula in the condition (5); n
λBe the refractive index of optical material in af at wavelength lambda.
Select for use the purpose of above-mentioned constraint condition following:
Can calculate selected optical material refractive index with the wavelength change situation by condition (5) since from visible light to the near infrared spectral range broad, the refractive index of optical material has certain variation range, rather than a constant.
Condition (6) and condition (7) are to calculate the formula of simple lens and lens combination focal length respectively.Can find out that focal length is with light refractive index confidential relation to be arranged; And the refractive index that can find out optical material by condition (5) is with wavelength change; Therefore; In order to guarantee that at whole visible light in the near-infrared band scope, the focal length variations amount of optical system is less, will choose refractive index is not too sensitive optical material to wavelength change as far as possible.Yet the kind of optical material is limited.It can also be seen that from condition (6) and condition (7); Can be through regulating signal-lens structural parameters (radius-of-curvature, thickness); And the distance between the lens combination, alleviate the pressure of choosing optical material, guarantee that finally the total system focal length is limited in certain limit with wavelength variable quantity.
Condition (8) is the relative dispersion coefficient that is used for the calculating optical material.The focal length of general wide spectroscopic system is all longer, and the relative conventional system of second order spectrum of long burnt system is all difficult to be proofreaied and correct.This need choose the close optical material group of relative dispersion coefficient and proofread and correct second order spectrum.Because the spectral band broad of native system; Calculating several kinds of glass respectively is the refractive index at 480nm, 580nm, 650nm, 780nm, 850nm, 920nm place and the residual volume of dispersion values calculating place second order spectrum at wavelength, proofreaies and correct second order spectrum and aberration through rational distribution system parameter.
The principal character of this wide spectrum confocal optical system is: require and actual operating position according to the detection to distant object; The spectral coverage of design is 450-950nm; And spectral band can carry out the wave band switching through changing optical filter between 450-700nm and 760-950nm; And switch the detection optical system of confocal of back, be suitable for the lower environment of standard visibility, misty and sensitivity and use.
At first several groups of optical materials have tentatively been chosen for reaching system requirements according to condition (8); Then according to condition (6), condition (7),, continue to optimize the structural parameters of system to the consideration of compromising of the structural parameters of optical material and optical group; Finally, selecting for use under the prerequisite of common material, realizing purpose confocal and the correction second order spectrum, obtaining the good effect of each SPECTRAL REGION imaging.
Table 1 and Fig. 2, Fig. 3, Fig. 4, Fig. 5 and Fig. 6 are the examples of the utility model, and R is the radius-of-curvature of each lens in the table; D is the distance between each optical surface; Nd is a d optical index of selecting optical material for use; Vd is a d optical dispersion coefficient of selecting optical material for use.
The focal length EFFL:73mm of system, field angle is: 9 °, F/#:1.75.Picture side's rear cut-off distance of two wave bands is 4mm, the length overall≤100mm of system.The processing characteristics of whole optical system lens is good, and is good through the confocal detection optical system image quality of the wide spectrum of actual experiment, can satisfy the detection of remote condition to target.
Table 1: each eyeglass data
| Sequence number | R object plane (mm) | d (∞) | nd | Vd | |
| 1 | 60.81 | 7 | 1.622 | 56.69 | |
| 2 | 424 | 4 | / | / | |
| 3 | -140.6 | 4 | 1.755 | 27.53 | |
| 4 | 54.95 | 7 | 1.622 | 56.69 | |
| 5 | -1011.5 | 9.59 | / | / | |
| 6 | 39.4 | 7 | 1.754 | 37.66 | |
| 7 | 121.34 | 14.33 | / | / | |
| 8 | Infinity | 19.7 | Diaphragm | / | |
| 9 | 31.81 | 5 | 1.622 | 56.69 | |
| 10 | 140.6 | 3 | / | / | |
| 11 | -28.233 | 4 | 1.755 | 27.53 | |
| 12 | 312.42 | 6.9 | / | / | |
| 13 | |
2 | 1.516 | 64.12 | |
| 14 | Infinity | 3.7 | / | / |
Consult shown in Figure 2; Fig. 2 is the MTF figure in 760nm～960nm wavelength coverage of optical system; Why mtf value reaches 0.7 at the 80lp/mm place, and MTF visual field and visual field, center on the edge of is approaching, makes that energy even distributes on the image planes; Can well tell the details of object in the scope of field, the whole city, it is more clear to form images.
Consult shown in Figure 3ly, Fig. 3 is the MTF figure in 450nm～700nm wavelength coverage of optical system, and mtf value reaches 0.6 at the 80lp/mm place, can satisfy the requirement of high-quality imaging lens.The visual field, edge is a little less than the visual field, center, and when using this wave band imaging, the edge does not have the visual field, center good as readability, does not influence system's detection of a target ability.In 0.7 visual field, the image quality of system, the image planes homogeneity is better.
Consult shown in Figure 4ly, Fig. 4 is the point range figure of optical system in 760nm～960nm wavelength coverage, and its RMS radius is near 1/4 wavelength; Each aberration is well proofreaied and correct; Make system become perfect picture, this system reaches diffraction limit basically, can finely satisfy the target detection demand.
Consult shown in Figure 5ly, Fig. 5 is the point range figure of optical system in 450nm～700nm wavelength coverage, and its RMS radius connects less than a wavelength; Each primary aberration of system is well proofreaied and correct; Senior aberration is very little, and residual aberration is little to the imaging influence, and optical system is clear in this wave band imaging.
Consult shown in Figure 6, Fig. 6 be optical system at this full wave secondary light spectrogram, at 0.7 visual field place, the second order spectrum of 450nm～700nm wave band is 0, fine correction second order spectrum and aberration.Also level off to 0 at 760nm～950nm wave band second order spectrum, have senior second order spectrum, do not influence the system imaging characteristic.In whole broadband scope, second order spectrum and aberration have well been proofreaied and correct by system, and after wave band switches, reach confocal, eliminate the image quality decline problem of bringing because of focal shift of system.
Though the present invention discloses as above with preferred embodiment; Right its is not in order to limit the present invention; Any person of ordinary skill in the field; In spirit that does not break away from the present invention and scope, when can doing a little change and improvement, so the present invention's protection domain is as the criterion when looking the claim person of defining.
Claims (2)
1. confocal detection optical system of the changeable wide spectrum of wave band; It is characterized in that: said spherical lens and the parallel plate glass by five separation of described confocal detection optical system constitutes; The optical material of five spherical lenses is in proper order: ZK10, ZF6 and ZK6 (cemented doublet), LAF5, ZK6; ZF6; The profile of five spherical lenses is followed successively by: first spherical lens is the convex-concave positive lens; Second spherical lens is that convex-concave positive lens, the 4th spherical lens are that convex-concave positive lens, the 5th spherical lens are concavo-convex negative lens for negative positive cemented doublet, the 3rd spherical lens, and the parallel plate glass material is simple glass K9, and parallel plate glass is between the 5th camera lens and CCD target surface; Select the wave band that uses, diaphragm to be fixed between the 3rd spherical lens and the 4th spherical lens through switching parallel plate glass.
2. the confocal detection optical system of the changeable wide spectrum of a kind of wave band according to claim 1; It is characterized in that: first spherical lens in the described confocal detection optical system, second spherical lens, the 3rd spherical lens are organized before forming optics; The 5th spherical lens, parallel plate glass are formed the back group; On first spherical lens, second spherical lens, the 3rd spherical lens, the 4th spherical lens, the 5th spherical lens, be coated with the 450-950nm anti-reflection film; On parallel plate glass, plate 450-700nm and 760-950nm anti-reflection film respectively, realize the switching of wave band through changing parallel flat.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210096888.4A CN102830484B (en) | 2012-10-10 | 2012-10-10 | A kind of wave band switchable wide spectrum confocal detection optical system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210096888.4A CN102830484B (en) | 2012-10-10 | 2012-10-10 | A kind of wave band switchable wide spectrum confocal detection optical system |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN102830484A true CN102830484A (en) | 2012-12-19 |
| CN102830484B CN102830484B (en) | 2015-11-11 |
Family
ID=47333674
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201210096888.4A Expired - Fee Related CN102830484B (en) | 2012-10-10 | 2012-10-10 | A kind of wave band switchable wide spectrum confocal detection optical system |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN102830484B (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107272154A (en) * | 2016-04-08 | 2017-10-20 | 扬明光学股份有限公司 | Imaging lens |
| CN107329229A (en) * | 2017-08-28 | 2017-11-07 | 深圳市广恩德科技有限公司 | A kind of large aperture focal length high definition camera lens |
| CN111796407A (en) * | 2020-07-09 | 2020-10-20 | 孝感华中精密仪器有限公司 | Multi-groove multi-guide wide-spectrum continuous zoom lens |
| CN113835200A (en) * | 2021-11-25 | 2021-12-24 | 南京万生华态科技有限公司 | Full-frame lens capable of simultaneously covering visible light and near-infrared light |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5479295A (en) * | 1993-09-02 | 1995-12-26 | Nikon Corporation | Compact zoom lens |
| CN101231379A (en) * | 2007-01-22 | 2008-07-30 | 富士能株式会社 | Imaging lens and imaging device having the same |
| US20090009888A1 (en) * | 2007-07-05 | 2009-01-08 | Taro Asami | Imaging lens and imaging device |
| JP2009163270A (en) * | 2009-04-22 | 2009-07-23 | Canon Inc | Zoom lens, and optical equipment having the same |
| CN101609206A (en) * | 2009-07-24 | 2009-12-23 | 福州开发区鸿发光电子技术有限公司 | Dual waveband optical zoom lens |
-
2012
- 2012-10-10 CN CN201210096888.4A patent/CN102830484B/en not_active Expired - Fee Related
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5479295A (en) * | 1993-09-02 | 1995-12-26 | Nikon Corporation | Compact zoom lens |
| CN101231379A (en) * | 2007-01-22 | 2008-07-30 | 富士能株式会社 | Imaging lens and imaging device having the same |
| US20090009888A1 (en) * | 2007-07-05 | 2009-01-08 | Taro Asami | Imaging lens and imaging device |
| JP2009163270A (en) * | 2009-04-22 | 2009-07-23 | Canon Inc | Zoom lens, and optical equipment having the same |
| CN101609206A (en) * | 2009-07-24 | 2009-12-23 | 福州开发区鸿发光电子技术有限公司 | Dual waveband optical zoom lens |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107272154A (en) * | 2016-04-08 | 2017-10-20 | 扬明光学股份有限公司 | Imaging lens |
| CN107329229A (en) * | 2017-08-28 | 2017-11-07 | 深圳市广恩德科技有限公司 | A kind of large aperture focal length high definition camera lens |
| CN111796407A (en) * | 2020-07-09 | 2020-10-20 | 孝感华中精密仪器有限公司 | Multi-groove multi-guide wide-spectrum continuous zoom lens |
| CN113835200A (en) * | 2021-11-25 | 2021-12-24 | 南京万生华态科技有限公司 | Full-frame lens capable of simultaneously covering visible light and near-infrared light |
| CN113835200B (en) * | 2021-11-25 | 2022-02-11 | 南京万生华态科技有限公司 | Full-frame lens capable of simultaneously covering visible light and near-infrared light |
Also Published As
| Publication number | Publication date |
|---|---|
| CN102830484B (en) | 2015-11-11 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US10107995B2 (en) | Zoom lens | |
| CN108318995B (en) | Lens system and lens | |
| CN105137567B (en) | Imaging lens, iris imaging module and iris identification device | |
| CN204044421U (en) | A kind of focal length type Panoramic annular imaging camera lens | |
| CN202735579U (en) | Uncooled long-wave infrared ultra-wide-angle fisheye lens | |
| CN109870787A (en) | A kind of optical imaging lens | |
| CN110568590A (en) | Starlight-level optical lens and imaging method thereof | |
| CN110687668A (en) | Optical passive type athermal long-focus short-wave infrared continuous zoom lens | |
| CN107966798B (en) | Short focus projection objective | |
| CN102830484A (en) | Wide-band confocal detection optical system with switchable band | |
| CN110609380B (en) | Lens | |
| CN205809392U (en) | A kind of near-infrared optical lens group | |
| CN205263386U (en) | Long -focus long wave infrared continuous zoom lens | |
| CN108646393B (en) | Long focus lens | |
| CN105445900A (en) | Imaging lens, iris imaging module and iris identification device | |
| CN104330867A (en) | Large-aperture small-F-number optical system used for television wave band | |
| CN106918897A (en) | A kind of compact ultra-wide angle day and night confocal opticses camera lens | |
| CN210742599U (en) | Starlight-level optical lens | |
| CN108845418A (en) | A kind of high-resolution machine vision optical system | |
| CN104238078A (en) | Wide-angle lens | |
| CN105242385A (en) | Glass aspheric day and night optical zoom lens with low zoom ratio | |
| CN105445902A (en) | Imaging lens, iris imaging module and iris identification device | |
| TWI588532B (en) | Four-piece infrared single wavelength lens assembly | |
| CN107561670A (en) | A kind of big thang-kngs of 2.8mm day and night confocal camera lens | |
| CN203965714U (en) | A kind of long-focus long-wave infrared continuous zoom lens |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20151111 Termination date: 20161010 |
|
| CF01 | Termination of patent right due to non-payment of annual fee |