CN104749745A - Large-visual-field high-resolution optical system - Google Patents
Large-visual-field high-resolution optical system Download PDFInfo
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- G—PHYSICS
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- 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
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Abstract
The invention discloses a large-visual-field high-resolution optical system. The large-visual-field high-resolution optical system comprises an imaging lens array, an image sensor array, a signal processing unit, a projection objective and a division lens array. The projection objective is positioned between an object plane and a first image plane. Units in the three arrays are in one-to-one correspondence mapping relation. The division lens array is positioned close to the first image plane. The imaging lens array and the image sensor array are positioned on one side, away from the object plane P1, of the first image plane. The division lens array is positioned between the object plane and the first image plane and close to the first image plane. The imaging lens array is positioned between the first image plane and the image sensor array. The first image plane is divided into visual field arrays by the division lens array, the object plane is imaged to a light sensing face of the image sensor array by the imaging lens array, and the image sensor array collects an image information array. The signal processing unit processes the image information array in an image processing mode to acquire large-visual-field high-resolution computational images.
Description
Technical field
The present invention relates to a kind of optical system, particularly relate to a kind of Large visual angle high-resolution optics system.
Background technology
Large visual angle high-resolution optics system is widely used in the fields such as biological medicine, aerial reconnaissance and topographic mapping.But owing to there is the relation of restriction mutually between visual field and resolution, generally wide cut full resolution pricture can not be obtained by means of only single exposure.If will fabric width be increased during high-resolution imaging, the general method adopting mechanical scanning.But the time that scanning obtains wide format images needs is long, and life period interval between frame and frame, and therefore this method is only effective to static scene.For some application, such as persistent surveillance on a large scale, also will ensure while obtaining Large visual angle can not the detailed information of lose objects, and must complete in the time range of single exposure, can only adopt face battle array staring imaging.To obtain Large visual angle and high resolving power simultaneously during the battle array staring imaging of face, the pixel number in image planes must reach 1,000,000,000 ranks.And current on monolithic image sensor pixel number can not reach this level far away, must splice.Image sensor splicing difficulty is large, and directly increases temperature control difficulty and camera development difficulty.In addition, consider from optical design angle, the resolving power of lens will match with the resolution of 1,000,000,000 pixel image sensors, under existing technical merit condition, designs and process the technological challenge that this lens remain huge.If the aberration of different field positions is different, the optical element of composition multiple aperture array will be different, and number is more, and the difficulty of processing and design is still very large.
On the whole, under current technical conditions, Large visual angle high-resolution imaging mainly contains three large technological difficulties: the pixel number 1) on current monolithic image sensor can not reach 1,000,000,000 orders of magnitude that Large visual angle high-resolution imaging requires far away; 2) from optical design angle, due to the existence of aberration, the lens combination that the resolving power of design and processing and 1,000,000,000 pixel image sensors matches is very difficult; 3) quantity of information due to the photo of Large visual angle high-resolution imaging acquisition is huge, is proposed very high requirement of real-time, concerning current technical merit, remains a large technical barrier to image transmitting and image procossing.
Summary of the invention
For the deficiencies in the prior art, the object of the present invention is to provide a kind of Large visual angle high-resolution optics system, provide the projection lens of the Large visual angle resolution that can match with 1,000,000,000 pixel image sensors, and under the condition that pixel number can not reach this level far away on current monolithic image sensor, by means such as segmentation splicing reconstruct, achieve the total solution of the complete image of the Large visual angle resolution with 1,000,000,000 pixels.Projection lens of the present invention achieve the spherical aberration of optical system, coma, astigmatism, every aberration such as axial chromatic aberation and multiplying power chromatic aberation etc. all obtains well-corrected, especially correct good to the second order spectrum of axial chromatic aberration, the processing of camera lens can be reduced again, the difficulty in test and dress school and cost.The present invention is applied to the development of the researchs such as biology, heredity, medical treatment and medicine and detection technique, the projection objective demand that the optical detection of high precision Large visual angle requires strengthens day by day, have at present simultaneously wide spectral, high-resolution, Large visual angle 3 kinds of performances the Design and manufacture of projection objective very difficult, also rare precedent.
The present invention realizes by the following technical solutions: a kind of Large visual angle high-resolution optics system, it comprises the projection objective one (PRJ1) be positioned between object plane (P1) and image planes one (P2), wherein: described Large visual angle high-resolution optics system also comprises sectioned lens array (LA), imaging lens array (PLA), image sensor array (P3A), signal processing unit, and described signal processing unit is electrically connected at image sensor array (P3A);
Sectioned lens array (LA) adopts some sectioned lens array layouts, imaging lens array (PLA) adopts some imaging lens array formula layouts, image sensor array (P3A) adopts some image sensor array layouts, and each unit in these three arrays is mutually corresponding man-to-man mapping relations;
Sectioned lens array (LA) is positioned near image planes one (P2), and imaging lens array (PLA), image sensor array (P3A) are all positioned at the side of image planes one (P2) away from object plane (P1); And sectioned lens array (LA) is positioned near image planes one (P2), imaging lens array (PLA) is also positioned between image planes one (P2) and image sensor array (P3A);
Object plane (P1) is imaged onto the image planes one (P2) of intermediate image plane by projection objective one (PRJ1), described image planes one (P2) are intermediate image plane, image planes one (P2) divided lens arra (LA) splits composition visual field array, the light-sensitive surface of image sensor array (P3A) is imaged onto again by imaging lens array (PLA), and making image sensor array (P3A) collect image information array, the wide visual field high resolving power that described image information array obtains object plane (P1) in image procossing mode is calculated shooting by described signal processing unit.
As the further improvement of such scheme, from object plane (P1) to image planes one (P2), projection objective one (PRJ1) comprises front lens group, light-splitting device one (BS1), rear lens group successively; Described Large visual angle high-resolution optics system also comprises light-splitting device two (BS2), projection objective two (PRJ2), from object plane (P1) to image planes two (P4), described front lens group, light-splitting device one (BS1), light-splitting device two (BS2), projection objective two (PRJ2) form imaging system successively.
Further, described Large visual angle high-resolution optics system also comprises at least one in illuminator one, illuminator two, to provide illumination to object plane (P1); Described illuminator one at least one LED array light source containing the different LED light source of multiple wavelength, at least one LED light source collector lens corresponding at least one LED array light source described, and at least one LED light source collector lens described corresponding and also with LED light source wavelength relevant at least one 2 to color separation device; The multiple different spectral energy of the LED light source of multiple different wave length is pooled to close positions and close direction by corresponding lamp condenser lens and corresponding 2 to color separation device by described LED array light source successively, and finally projects object plane (P1) by light-splitting device two (BS2), light-splitting device one (BS1), described front lens group successively; Described illuminator two adopts laser lighting, the laser corrugated of described illuminator two is parallel with image planes two (P4) or be partial to an angle at image planes two (P4) place, more finally projects object plane (P1) by projection objective two (PRJ2), light-splitting device two (BS2), light-splitting device one (BS1), described front lens group successively.
As the further improvement of such scheme, described Large visual angle high-resolution optics system also comprises at least one in illuminator one, illuminator two, to provide illumination to object plane (P1); Described illuminator one at least one LED array light source containing the different LED light source of multiple wavelength, at least one LED light source collector lens corresponding at least one LED array light source described, and at least one LED light source collector lens described corresponding and go back relevant at least one of LED light source wavelength 2 to color separation device; The multiple different spectral energy of the LED light source of multiple different wave length is pooled to close positions and close direction by corresponding lamp condenser lens and 2 to color separation device by described LED array light source successively, and finally projects object plane (P1) by light-splitting device one (BS1), described front lens group successively; Described illuminator two adopts laser lighting, and described illuminator two finally projects object plane (P1) by light-splitting device one (BS1), described front lens group successively.
Again further, described Large visual angle high-resolution optics system comprises described illuminator for the moment, and described illuminator one is selected by timesharing and switched the switch of different LED light sources and strong and weak mode, changes the spectrum of illumination light; The image information array of the image sensor array (P3A) when described signal processing unit gathers the illumination light of different spectrum respectively, then calculate shooting by the wide visual field high resolving power that image procossing mode obtains object plane (P1).
As the further improvement of such scheme, from object plane (P1) to image planes one (P2), projection objective one (PRJ1) comprises the first mirror group (G1), light-splitting device one (BS1), the second mirror group (G2), the 3rd mirror group (G3) successively;
In the second mirror group (G2), meet relational expression: Vd=(nd-1)/(nF-nC), nd < 1.65 and the rarest two of the positive lens of Vd > 62, nd > 1.50 and the rarest one of the negative lens of Vd < 55; Wherein, Vd is abbe number, the constant of dispersion degree embodying optical material, and nF is the F line refractive index of Bo Long 486nm, and nd is the d line refractive index of Bo Long 587nm, and nC is the C line refractive index of Bo Long 656nm; And at least meet relational expression containing two air-lens: | (r21-r22)/(r21+r22) | <0.6, | (Vd21-Vd22) | > 28, | (nd21-nd22) | > 0.09; Wherein, r21, r22 are respectively the radius-of-curvature of the lens surface of air-lens both sides, and Vd21, Vd22 are respectively the abbe number of the lens of air-lens both sides, and nd21, nd22 are respectively the d line refractive index of the lens of the both sides of air-lens;
In the 3rd mirror group (G3), containing the concave surface one that a pair faces one another, and at least containing a negative lens between the described concave surface one faced one another for a pair, and described negative lens contains the concave surface two towards object plane; 3rd mirror group (G3) also meets relational expression: at least meet ndp > ndn containing a positive lens and a negative lens, at least meets Vdp < Vdn containing a positive lens and a negative lens; Wherein, ndp is the d line refractive index of described positive lens, and ndn is the d line refractive index of described negative lens, and Vdp is the abbe number of described positive lens, and Vdn is the abbe number of described negative lens;
Relational expression is met: 0.3<f1/fa<2.8 between first mirror group (G1), the second mirror group (G2), each mirror group of the 3rd mirror group (G3), 0.25<f2/fa<2.5,0.25<-f3/fa<5.5; Wherein, f1 is the combined focal length of the first mirror group (G1), and f2 is the combined focal length of the second mirror group (G2), and f3 is the combined focal length of the 3rd mirror group (G3), and fa is the combined focal length of whole projection objective.
Further, all lens surfaces are sphere, and not containing aspheric surface, the second mirror group and the 3rd mirror group are that the simple lens not containing cemented surface forms.
As the further improvement of such scheme, projection objective one (PRJ1) in the resolution of each field positions of point visual field array close to optical diffraction limit; Unit has identical optical parametric and element in sectioned lens array (LA), imaging lens array (PLA), image sensor array (P3A), and independent of the correct for optical aberrations alone of projection objective one (PRJ1).
As the further improvement of such scheme, the unit of sectioned lens array (LA) is identical square, regular hexagon or rectangle, and is interconnected and is structure as a whole.
As the further improvement of such scheme, the unit of sectioned lens array (LA) is not more than the surface curvature radius towards imaging lens array (PLA) towards the surface curvature radius of object plane (P1), and the unit surface of sectioned lens array (LA) in imaging lens array (PLA) side is sphere, and the sphere center position of each unit sphere is identical.
Advantage of the present invention:
1, provide the projection lens of the Large visual angle resolution that can match with 1,000,000,000 pixel image sensors, and under the condition that pixel number can not reach this level far away on current monolithic image sensor, by means such as segmentation splicing reconstruct, achieve the total solution of the complete image of the Large visual angle resolution with 1,000,000,000 pixels;
2, have wide spectral, high-resolution, Large visual angle 3 kinds of characteristics, the difficulty of design is very large, current also rare precedent simultaneously; The intermediary image of projection objective 1 has good heart effect far away, for later capture provides good condition;
3, the diverse location resolution of projection objective one (PRJ1) whole visual field is close to optical diffraction limit, because aberration is enough little, and it is very close, so point view field imaging lens array unit of identical optical parameter and element can be used, considerably reduce difficulty and the cost in point processing of view field imaging lens array and dress school;
4, the greatest optical bore of projection objective only has about 60% of image space full filed bore, considerably reduce manufacturing cost and the difficulty of projection objective, and the greatest optical bore of common image space heart projection objective far away is more than 100% of image space full filed bore, manufacturing cost is high and manufacture difficulty is large;
5, projection objective one (PRJ1) bore is little, does not comprise aspherical lens, considerably reduces processing, detects and fill difficulty and the cost in school;
6, system extension performance is good, can realize multiplely coaxially falling to penetrating illumination.
Accompanying drawing explanation
The structural representation of the Large visual angle high-resolution optics system that Fig. 1 provides for present pre-ferred embodiments.
Fig. 2 is the structural representation of air-lens.
Fig. 3 is 0.7 aperture place axial chromatic aberration curve map of Large visual angle high-resolution optics system in Fig. 1.
Fig. 4 is that in Fig. 1, Large visual angle high-resolution optics system is schemed at the transport function MTF of 480-730nm wavelength coverage.
Fig. 5 be the sectioned lens array LA of Large visual angle high-resolution optics system in Fig. 1 and image sensor array P3A in conjunction with schematic diagram.
Fig. 6 and Fig. 5 is similar, for the sectioned lens array LA of Large visual angle high-resolution optics system in Fig. 1 and the another kind of image sensor array P3A are in conjunction with schematic diagram.
Embodiment
In order to make object of the present invention, technical scheme and advantage clearly understand, below in conjunction with drawings and Examples, the present invention is further elaborated.Should be appreciated that specific embodiment described herein only in order to explain the present invention, be not intended to limit the present invention.
Refer to Fig. 1, the structural representation of its Large visual angle high-resolution optics system provided for present pre-ferred embodiments.From object plane P1 to image planes one P2, Large visual angle high-resolution optics system comprises projection objective one PRJ1, sectioned lens array LA, imaging lens array PLA, image sensor array P3A, signal processing unit successively, and described signal processing unit is electrically connected at image sensor array P3A.
From object plane P1 to image planes one P2, projection objective one PRJ1 comprises front lens group, light-splitting device one BS1, rear lens group successively.Front lens group comprises the first mirror group G1, and rear lens group comprises the second mirror group G2, the 3rd mirror group G3.Image planes one P2 is provided with diaphragm AS in the second mirror group G2, and the openings of sizes of diaphragm AS can regulate, and can adopt the adjustable diaphragm of openings of sizes.Image planes one P2
From object plane P1 to image planes one P2, the first mirror group G1 can comprise the first lens L1, the second lens L2, the 3rd lens L3, the 4th lens L4 successively.Second mirror group G2 can comprise at least two lens with negative power and wherein at least one lens is biconcave lens; Also can comprise at least three lens with positive light coke and wherein at least two lens are biconvex lens.In the present embodiment, from object plane P1 to image planes one P2, the second mirror group G2 comprises the 5th lens L5, the 6th lens L6, the 7th lens L7, the 8th lens L8, the 9th lens L9, the tenth lens L10, the 11 lens L11 successively.3rd mirror group G3 can comprise at least two lens with negative power; Also can comprise at least two lens with positive light coke and comprise at least one crescent lens.In the present embodiment, from object plane P1 to image planes one P2, the 3rd mirror group G3 comprises the 12 lens L12, the 13 lens L13, the 14 lens L14, the 15 lens L15, the 16 lens L16, the 17 lens L17 successively.
Wherein, the first lens L1, the 3rd lens L3, the 6th lens L6, the 9th lens L9, the 13 lens L13, the 14 lens L14, the 15 lens L15 all have negative power.Second lens L2, the 4th lens L4, the 5th lens L5, the 7th lens L7, the 8th lens L8, the tenth lens L10, the 11 lens L11, the 12 lens L12, the 16 lens L16, the 17 lens L17 all have positive light coke.In the present embodiment, the component parameters of first to the 17 lens L1 ~ L17 is as shown in table 1.
Table 1 projection objective parameter
Relational expression is met: 0.3<f1/fa<2.8 between first mirror group G1, the second mirror group G2, each mirror group of the 3rd mirror group G3,0.25<f2/fa<2.5,0.25<-f3/fa<5.5.Wherein, f1 is the combined focal length of the first mirror group G1, and f2 is the combined focal length of the second mirror group G2, and f3 is the combined focal length of the 3rd mirror group G3, and fa is the combined focal length of whole projection objective.Such lens structure can make the spherical aberration of projection objective, coma, astigmatism, filed curvature and distortion, and every aberrations such as axial chromatic aberation and multiplying power chromatic aberation are all rationally corrected.In the present embodiment, f1/fa=0.211, f2/fa=0.282 ,-f3/fa=0.150.
In the first mirror group G1, at least meet containing a positive lens and a negative lens: ndp > ndn, at least meet containing a positive lens and a negative lens: Vdp < Vdn.Wherein, ndp is the d line refractive index of described positive lens, and ndn is the d line refractive index of described negative lens, and Vdp is the abbe number of described positive lens, and Vdn is the abbe number of described negative lens.The Main Function that first mirror group G1 designs like this is the elementary and high-order spherical aberration correcting projection objective, the second order spectrum aberration of the axial chromatic aberration of balance projection objective, the ratio chromatism, of auxiliary balance projection objective.
In the second mirror group G2, meet relational expression: 1. Vd=(nd-1)/(nF-nC); 2. nd < 1.65 and the rarest two of the positive lens of Vd > 62; 3. nd > 1.50 and the rarest one of the negative lens of Vd < 55; 4. at least relational expression is met containing two air-lens: | (r21-r22)/(r21+r22) | <0.6, | (Vd21-Vd22) | > 28, | (nd21-nd22) | > 0.09.Wherein, Vd is abbe number, the constant of dispersion degree embodying optical material, and nF is the F line refractive index of Bo Long 486nm, and nd is the d line refractive index of Bo Long 587nm, and nC is the C line refractive index of Bo Long 656nm; R21, r22 are respectively the radius-of-curvature of the lens surface of air-lens both sides, and Vd21, Vd22 are respectively the abbe number of the lens of air-lens both sides, and nd21, nd22 are respectively the d line refractive index of the lens of the both sides of air-lens.
For air-lens, in the lens group forming camera lens, can be regarded as the lens as refractive index 1.0 by air space (air space) L that adjacent two glass lenss are clipped in the middle, the air space designed in view of this consideration can be described as air-lens, air-lens L as shown in Figure 2.The front and back index of refraction relationship of air-lens L is that glass lens Lx, the Ly respectively with adjacent is contrary, and therefore convex surface has concavees lens effect, and concave surface has the effect of convex lens.Please again consult Fig. 1, in the present embodiment, between lens L6, L7 of second mirror group L2, between lens L8, L9, article namely all exist between lens L9, L10 and meet the 4.: | (r21-r22)/(r21+r22) | <0.6, | (Vd21-Vd22) | > 28, | (nd21-nd22) | the air-lens of > 0.09.As relational expression | (r21-r22)/(r21+r22) | calculated value be respectively 0.211,0.282 and 0.150, meet relational expression | (r21-r22)/(r21+r22) | <0.6.Main Function is the elementary and high-order spherical aberration and the coma that correct projection objective, corrects the axial chromatic aberration of projection objective simultaneously and effectively reduces its second order spectrum aberration; Effectively reduce amber hereby to cut down (Petzval) and make the curvature of the image of projection objective to obtain well-corrected.
Second mirror group L2 the 5. article namely: the second mirror group G2 at least meets at ambient temperature containing two positive lenss: dn/dt < 0.Different from dn/dt > 0 characteristic of general optical glass material, when having positive lens to meet dn/dt < 0, contrary with the characteristic of the thermal refractive index coefficient of other general optical glass lens, cancel each other, so the thermal stability of projection objective can be improved, make projection objective when variation of ambient temperature, its image planes position and image quality keep stable.
In the 3rd mirror group G3, containing the concave surface one that a pair faces one another, and at least containing a negative lens between the described concave surface one faced one another for a pair, and described negative lens contains the concave surface two towards object plane P1.3rd mirror group G3 also meets relational expression: at least meet ndp > ndn containing a positive lens and a negative lens, at least meets Vdp < Vdn containing a positive lens and a negative lens.The Main Function that 3rd mirror group G3 designs like this is the elementary and senior astigmatism of balance projection objective and contributes to reducing the second order spectrum aberration of axial chromatic aberration, balances the ratio chromatism, of projection objective.In the present embodiment, the concave surface one faced one another for a pair is there is between 13 lens L13 and the 15 lens L15, namely the 13 lens L13 is concave surface towards the curved surface of the 15 lens L15, and the 15 lens L15 is also concave surface towards the curved surface of the 13 lens L13.Between this is to the concave surface one faced one another, exist for the 14 lens L14 of negative lens, the 14 lens L14 contains the concave surface two towards object plane P1, and namely the 14 lens L14 is also concave surface towards the curved surface of object plane P1.
In order to eliminate the internal stress of optical mirror slip, thermal stress and aging, and to the harmful effect that optical imagery causes, keep the stability of projection objective, all lens surfaces in first mirror group G1, the second mirror group G2, the 3rd mirror group G3 are sphere, not containing aspheric surface, the simple lens that the second mirror group G2, the 3rd mirror group G3 are not containing cemented surface forms.In addition, do not comprise aspherical lens, significantly can reduce processing, detect and fill difficulty and the cost in school.
In order to good image space heart projection objective far away effect can be obtained, for later capture provides good condition, image planes one P2 has the concave spherical surface towards object plane P1, and meets: α in<NA/ β, 0.8<Lpout/Rim<1.2; Wherein, α in is the incident angle of chief ray at image planes one P2 of projection objective, and NA is the object-side numerical aperture of projection objective, and β is the enlargement ratio of projection objective, and Lpout is the radius-of-curvature of projection objective image space distance of exit pupil, Rim image planes concave spherical surface.
In the present embodiment, the parameter value of projection objective: β=10; NA=0.35; Hy=21.2; Spectral range: 470-750nm.Wherein, β is projection multiplying power, 4< β <18; NA is object plane opening number; Hy is maximum object height.
Light-splitting device one BS1 is provided with (in the present embodiment between the first mirror group G1 and the 3rd mirror group G3, light-splitting device one BS1 is between the first mirror group G1 and the second mirror group G2), light-splitting device one BS1 meets: Tpl > 0.6Dop.Wherein, Tpl is light-splitting device one BS1 thickness, Dop is the maximum clear aperture of light-splitting device one BS1, light-splitting device one BS1 is the divided beams device with fractional transmission and part reflection, its Main Function to utilize the fractional transmission of light-splitting device one BS1 and the light splitting function of part reflection, realizes variously coaxially falling to penetrating illumination.
In order to the conservative control cost of wide visual field high resolving power projection objective, and obtain best cost performance, the lens total quantity of described wide visual field high resolving power projection objective is between 12 to 28.
In a word, in the present embodiment, three lens cluster adopts such lens structure finally to guarantee and achieves the spherical aberration of projection objective, coma, astigmatism, filed curvature and distortion, every aberration such as axial chromatic aberation and multiplying power chromatic aberation etc. all obtains well-corrected, effectively can control the greatest optical bore of camera lens simultaneously, reduce the processing of camera lens, the difficulty in test and dress school and cost.
The wide visual field high resolving power projection objective of present embodiment, the axial chromatic aberration of wide visual field high resolving power projection objective as shown in Figure 3, effectively corrects axial chromatic aberration within the scope of broad band, covers 480-730nm wavelength coverage.As can be seen from the figure, the present invention can obtain high imaging quality effectively.The projection objective of wide visual field high resolving power projection objective is schemed as shown in Figure 4 at the transport function MTF of 480-730nm wavelength coverage.Wave aberration WFE (RMS) result of the analysis of specialty optics design software shows: the wave aberration WFE (RMS) of each wavelength is all less than 1/14 of its wavelength, as shown in table 2.
The wave aberration of each wavelength of table 2
| Wavelength (nm) | Title | Wave aberration (RMS) |
| 486.13 | F line | 1/14λ |
| 546.07 | E line | 1/19λ |
| 587.56 | D line | 1/21λ |
| 656.27 | C line | 1/19λ |
| 706.52 | R line | 1/16λ |
| 730 | --- | 1/15λ |
| 480-730 | Wavelength coverage | 1/15λ |
Therefore, the present invention has wide spectral, high-resolution, Large visual angle 3 kinds of characteristics simultaneously, current also rare precedent; There is good image space heart projection objective far away effect, for later capture provides good condition; The greatest optical bore of projection objective only has about 60% of image space full filed bore, considerably reduces manufacturing cost and the difficulty of projection objective.And the greatest optical bore of common image space heart projection objective far away is more than 100% of image space full filed bore, manufacturing cost is high and manufacture difficulty is large; Eyeglass bore is little, does not comprise aspherical lens, considerably reduces processing, detects and fill difficulty and the cost in school; The fractional transmission of light-splitting device one BS1 and the light splitting function of part reflection can be utilized, realize variously coaxially falling to penetrating illumination.
Sectioned lens array LA adopts some sectioned lens array layouts, imaging lens array PLA adopts some imaging lens array formula layouts, image sensor array P3A adopts some image sensor array layouts, and each unit in these three arrays is mutually corresponding man-to-man mapping relations.
Sectioned lens array LA is positioned near image planes one P2, and imaging lens array PLA, image sensor array P3A are all positioned at the side of image planes one P2 away from object plane P1, and imaging lens array PLA is also between image planes one P2 and image sensor array P3A.Particularly, sectioned lens array LA is positioned at the neighbouring finger of image planes one P2: sectioned lens array LA can be positioned at the side of image planes one P2, also can be in the same side of image planes one P2 with imaging lens array PLA, image sensor array P3A.
The divided lens arra LA of image planes one P2 splits composition visual field array, object plane P1 is made to be imaged onto the light-sensitive surface of image sensor array P3A by imaging lens array PLA, and making image sensor array P3A collect image information array, described image information array is obtained wide visual field high resolving power in image procossing mode (as Registration and connection, calculating reconstruction mode etc.) and calculates shooting by described signal processing unit.
Projection objective one PRJ1 each field positions there is close aberration characteristic, a point view field imaging array unit has and has identical optical parametric and structure.
In the present embodiment, image planes one P2 can be the concave spherical surface towards object plane P1, and meets:
Sin(αy–αarray)<0.5NA/β，
αin<NA/β，
0.8<Lpout/Rim<1.2，
Wherein, α y is be the chief ray of y and the angle of projection objective one PRJ1 center line at image planes one P2 place image height,
α array is the angle of each unit center line of point view field imaging array and projection objective one PRJ1 center line,
α in is the chief ray incidence angles of image planes one P2,
NA is object plane P1 numerical aperture,
β is the enlargement ratio of optical system,
Lpout is image planes one P2 distance of exit pupil,
The radius-of-curvature of the concave spherical surface of Rim image planes one P2.
The unit of sectioned lens array LA can along the concave spherical surface close-packed arrays of image planes one P2, and the concave sphere's center of the arrangement track of the unit of sectioned lens array LA can be identical or close with the concave sphere's center position of image planes one P2.
The unit of sectioned lens array LA is not more than the surface curvature radius towards imaging lens array PLA towards the surface curvature radius of object plane P1.The unit of sectioned lens array LA can be identical square, regular hexagon or rectangle, and is interconnected and is structure as a whole.The combination of sectioned lens array LA and image sensor array P3A, refers to Fig. 5 and Fig. 6, and it is two kinds of combinations of sectioned lens array LA and image sensor array P3A, all availablely reaches effect of the present invention.The unit of imaging lens array PLA and image sensor array P3A can have separate position and focal plane governor motion.
From object plane P1 to image planes two P4, Large visual angle high-resolution optics system comprises front lens group (i.e. the first mirror group G1), light-splitting device one BS1, light-splitting device two BS2, projection objective two PRJ2 successively.From object plane P1 to image planes two P4, the first mirror group G1, light-splitting device one BS1, light-splitting device two BS2, projection objective two PRJ2 form second imaging system successively.The structure of first imaging system is presented hereinbefore: from object plane P1 to image planes one P2, and Large visual angle high-resolution optics system comprises projection objective one PRJ1, sectioned lens array LA, imaging lens array PLA, image sensor array P3A, signal processing unit successively.At the image planes two P4 place of the second imaging system, image sensor is installed, the calculating shooting capture speed more rapidly of the image information gathered than image sensor array P3A can be obtained.
Large visual angle high-resolution optics system of the present invention, by two imaging systems, arbitrarily can switch one of them imaging system and carry out imaging.Two imaging systems make to form conjugate imaging relation between object plane P1 and image planes one P2, image planes two P4, and two imaging systems can have different projection multiplying powers, and the first mirror group G1 is that both are public.
In addition, object plane P1 can also adopt illuminator to be imported other illumination light needing imaging and focusing by the second imaging system.As, in the present embodiment, described Large visual angle high-resolution optics system also comprises illuminator LS object plane P1 being provided to illumination.Illuminator LS can provide multiple spectrum illumination light, by the part lens of light-splitting device and projection objective one PRJ1, illumination light is projected object plane P1, for object plane P1 provides illumination along the centerline direction of projection objective one PRJ1.
Particularly, illuminator LS can at least one LED array light source containing the different LED light source of multiple wavelength, at least one LED light source collector lens corresponding at least one LED array light source described, and at least one LED light source collector lens described corresponding and go back relevant at least one of LED light source wavelength corresponding 2 to color separation device.In the present embodiment, the quantity of LED array light source is illustrated for three: LS1, LS2, LS3, corresponding with these three LED array light source, the quantity of lamp condenser lens is also three: CL1, CL2, CL3, and corresponding 2 are also three to the quantity of color separation device: DM1, DM2, DM3.
The multiple different spectral energy of the LED light source of multiple different wave length is pooled to close positions and close direction by corresponding lamp condenser lens and corresponding 2 to color separation device by LED array light source successively, and finally projects object plane P1 by light-splitting device two BS2, light-splitting device one BS1, the first mirror group G1 successively.Illuminator LS is selected by timesharing and switches the switch of different LED light sources and strong and weak mode, changes the spectrum of illumination light.The image information array of image sensor array P3A when described signal processing unit gathers the illumination light of different spectrum respectively, then calculate shooting by the wide visual field high resolving power that image procossing mode (as Registration and connection, calculating reconstruction mode etc.) obtains object plane P1.
Certainly, in other embodiments, described illuminator also can adopt laser lighting, the laser corrugated of described illuminator two is parallel with image planes two P4 or be partial to an angle at image planes two P4 place, more finally projects object plane P1 by projection objective two PRJ2, light-splitting device two BS2, light-splitting device one BS1, the first mirror group G1 successively.
Certainly, in other embodiments, the second imaging system can not be arranged, and now, described Large visual angle high-resolution optics system also can select at least one to be used for providing illumination to object plane P1 in illuminator one with illuminator two.If described illuminator one, now, the multiple different spectral energy of the LED light source of multiple different wave length is pooled to close positions and close direction by corresponding lamp condenser lens and corresponding 2 to color separation device by LED array light source successively, and finally projects object plane P1 by light-splitting device one BS1, described front lens group successively.If described illuminator two, now, object plane P1 is finally projected by light-splitting device one BS1, described front lens group successively.
In sum, beneficial effect of the present invention is as follows:
1, have wide spectral, high-resolution, Large visual angle 3 kinds of characteristics, the difficulty of design is very large, current also rare precedent simultaneously;
2, the intermediary image of projection objective 1 has good heart effect far away, for later capture provides good condition;
3, the greatest optical bore of projection objective only has about 60% of image space full filed bore, considerably reduce manufacturing cost and the difficulty of projection objective, and the greatest optical bore of common image space heart projection objective far away is more than 100% of image space full filed bore, manufacturing cost is high and manufacture difficulty is large;
4, projection objective one PRJ1 bore is little, does not comprise aspherical lens, considerably reduces processing, detects and fill difficulty and the cost in school;
5, the aberration of the diverse location of the whole visual field of projection objective one PRJ1 is very close, and close to diffraction limit, can use identical point view field imaging lens array unit, considerably reduces difficulty and the cost in point processing of view field imaging lens array and dress school;
6, system extension performance is good, can realize multiplely coaxially falling to penetrating illumination.
The foregoing is only preferred embodiment of the present invention, not in order to limit the present invention, all any amendments done within the spirit and principles in the present invention, equivalent replacement and improvement etc., all should be included within protection scope of the present invention.
Claims (10)
1. a Large visual angle high-resolution optics system, it comprises the projection objective one (PRJ1) be positioned between object plane (P1) and image planes one (P2), it is characterized in that: described Large visual angle high-resolution optics system also comprises sectioned lens array (LA), imaging lens array (PLA), image sensor array (P3A), signal processing unit, and described signal processing unit is electrically connected at image sensor array (P3A);
Wherein, sectioned lens array (LA) adopts some sectioned lens array layouts, imaging lens array (PLA) adopts some imaging lens array formula layouts, image sensor array (P3A) adopts some image sensor array layouts, and each unit in these three arrays is mutually corresponding man-to-man mapping relations;
Sectioned lens array (LA) is positioned near image planes one (P2), and imaging lens array (PLA), image sensor array (P3A) are all positioned at the side of image planes one (P2) away from object plane (P1); And sectioned lens array (LA) is positioned near image planes one (P2), imaging lens array (PLA) is also positioned between image planes one (P2) and image sensor array (P3A);
Object plane (P1) is imaged onto image planes one (P2) by projection objective one (PRJ1), image planes one (P2) are intermediate image plane, image planes one (P2) divided lens arra (LA) splits composition visual field array, the light-sensitive surface of image sensor array (P3A) is imaged onto again by imaging lens array (PLA), and making image sensor array (P3A) collect image information array, the wide visual field high resolving power that described image information array obtains object plane (P1) by image procossing mode is calculated shooting by described signal processing unit.
2. Large visual angle high-resolution optics system as claimed in claim 1, it is characterized in that: from object plane (P1) to image planes one (P2), projection objective one (PRJ1) comprises front lens group, light-splitting device one (BS1), rear lens group successively; Described Large visual angle high-resolution optics system also comprises light-splitting device two (BS2), projection objective two (PRJ2), from object plane (P1) to image planes two (P4), described front lens group, light-splitting device one (BS1), light-splitting device two (BS2), projection objective two (PRJ2) form imaging system successively.
3. Large visual angle high-resolution optics system as claimed in claim 2, is characterized in that: described Large visual angle high-resolution optics system also comprises at least one in illuminator one, illuminator two, to provide illumination to object plane (P1);
Described illuminator one at least one LED array light source containing the different LED light source of multiple wavelength, at least one LED light source collector lens corresponding at least one LED array light source described, and at least one LED light source collector lens described corresponding and also with LED light source wavelength relevant at least one 2 to color separation device; The multiple different spectral energy of the LED light source of multiple different wave length is pooled to close positions and close direction by corresponding lamp condenser lens and corresponding 2 to color separation device by described LED array light source successively, and finally projects object plane (P1) by light-splitting device two (BS2), light-splitting device one (BS1), described front lens group successively;
Described illuminator two adopts laser lighting, the laser corrugated of described illuminator two is parallel with image planes two (P4) or be partial to an angle at image planes two (P4) place, more finally projects object plane (P1) by projection objective two (PRJ2), light-splitting device two (BS2), light-splitting device one (BS1), described front lens group successively.
4. Large visual angle high-resolution optics system as claimed in claim 1, is characterized in that: described Large visual angle high-resolution optics system also comprises at least one in illuminator one, illuminator two, to provide illumination to object plane (P1);
Described illuminator one at least one LED array light source containing the different LED light source of multiple wavelength, at least one LED light source collector lens corresponding at least one LED array light source described, and at least one LED light source collector lens described corresponding and go back relevant at least one of LED light source wavelength 2 to color separation device; The different spectral energies of multiple LED light source are pooled to close positions and close direction by corresponding lamp condenser lens and 2 to color separation device by described LED array light source successively, and finally project object plane (P1) by light-splitting device one (BS1), described front lens group successively;
Described illuminator two adopts laser lighting, and described illuminator two finally projects object plane (P1) by light-splitting device one (BS1), described front lens group successively.
5. the Large visual angle high-resolution optics system as described in claim 3 or 4, it is characterized in that: described Large visual angle high-resolution optics system comprises described illuminator for the moment, described illuminator one is selected by timesharing and is switched the switch of different LED light sources and strong and weak mode, changes the spectrum of illumination light; The image information array of the image sensor array (P3A) when described signal processing unit gathers the illumination light of different spectrum respectively, then calculate shooting by the wide visual field high resolving power that image procossing mode obtains object plane (P1).
6. Large visual angle high-resolution optics system as claimed in claim 1, it is characterized in that: from object plane (P1) to image planes one (P2), projection objective one (PRJ1) comprises the first mirror group (G1), light-splitting device one (BS1), the second mirror group (G2), the 3rd mirror group (G3) successively;
In the second mirror group (G2), meet relational expression: Vd=(nd-1)/(nF-nC), nd < 1.65 and the rarest two of the positive lens of Vd > 62, nd > 1.50 and the rarest one of the negative lens of Vd < 55; Wherein, Vd is abbe number, the constant of dispersion degree embodying optical material, and nF is the F line refractive index of Bo Long 486nm, and nd is the d line refractive index of Bo Long 587nm, and nC is the C line refractive index of Bo Long 656nm; And at least meet relational expression containing two air-lens: | (r21-r22)/(r21+r22) | <0.6, | (Vd21-Vd22) | > 28, | (nd21-nd22) | > 0.09; Wherein, r21, r22 are respectively the radius-of-curvature of the lens surface of air-lens both sides, and Vd21, Vd22 are respectively the abbe number of the lens of air-lens both sides, and nd21, nd22 are respectively the d line refractive index of the lens of the both sides of air-lens;
In the 3rd mirror group (G3), containing the concave surface one that a pair faces one another, and at least containing a negative lens between the described concave surface one faced one another for a pair, and described negative lens contains the concave surface two towards object plane; 3rd mirror group (G3) also meets relational expression: at least meet ndp > ndn containing a positive lens and a negative lens, at least meets Vdp < Vdn containing a positive lens and a negative lens; Wherein, ndp is the d line refractive index of described positive lens, and ndn is the d line refractive index of described negative lens, and Vdp is the abbe number of described positive lens, and Vdn is the abbe number of described negative lens;
Relational expression is met: 0.3<f1/fa<2.8 between first mirror group (G1), the second mirror group (G2), each mirror group of the 3rd mirror group (G3), 0.25<f2/fa<2.5,0.25<-f3/fa<5.5; Wherein, f1 is the combined focal length of the first mirror group (G1), and f2 is the combined focal length of the second mirror group (G2), and f3 is the combined focal length of the 3rd mirror group (G3), and fa is the combined focal length of whole projection objective.
7. Large visual angle high-resolution optics system as claimed in claim 6, is characterized in that: all lens surfaces are sphere, and not containing aspheric surface, the second mirror group and the 3rd mirror group are that the simple lens not containing cemented surface forms.
8. Large visual angle high-resolution optics system as claimed in claim 1, is characterized in that: projection objective one (PRJ1) in the resolution of each field positions of point visual field array close to optical diffraction limit; Unit has identical optical parametric and element in sectioned lens array (LA), imaging lens array (PLA), image sensor array (P3A), and independent of the correct for optical aberrations alone of projection objective one (PRJ1).
9. Large visual angle high-resolution optics system as claimed in claim 1, is characterized in that: the unit of sectioned lens array (LA) is identical square, regular hexagon or rectangle, and is interconnected and is structure as a whole.
10. Large visual angle high-resolution optics system as claimed in claim 1, it is characterized in that: the unit of sectioned lens array (LA) is not more than the surface curvature radius towards imaging lens array (PLA) towards the surface curvature radius of object plane (P1), and the unit surface of sectioned lens array (LA) in imaging lens array (PLA) side is sphere, and the sphere center position of each unit sphere is identical.
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Denomination of invention: A high resolution optical system with large field of view Effective date of registration: 20230209 Granted publication date: 20170301 Pledgee: Bank of China Limited Zhangjiagang branch Pledgor: ZHANGJIAGANG ZHONGHE AUTOMATION TECHNOLOGY CO.,LTD. Registration number: Y2023980032319 |