CN104730688B - Wide-visual-field and high-resolution optical system - Google Patents
Wide-visual-field and high-resolution optical system Download PDFInfo
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- 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
- G02B13/0085—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras employing wafer level optics
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- G—PHYSICS
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- G02B13/06—Panoramic objectives; So-called "sky lenses" including panoramic objectives having reflecting surfaces
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- G—PHYSICS
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Abstract
The invention discloses a wide-visual-field and high-resolution optical system. The optical system comprises an imaging lens array, an image sensor array, a signal processing unit, a first projection objective lens located between an object surface and a first image surface and a segmentation lens array, wherein units in the three arrays are in corresponding one-to-one mapping relation; the first image surface is segmented by the segmentation lens array into sub-visual-field arrays to allow the object surface to be imaged to the light sensing face of the image sensor array through the imaging lens array, the image sensor array is allowed to collect an image information array, the signal processing unit performs image processing on the image information array to obtain wide-visual-field and high-resolution calculation images; the first image surface is a concave spherical surface facing the object surface; the segmentation lens array, the imaging lens array and the image sensor array form units equally dividing a visual field imaging array and are radially regularly arranged by using the sphere center of the concave spherical surface or a close one point on the central line of the first projection lens as the center.
Description
Technical field
The present invention relates to a kind of optical system, particularly relate to a kind of wide visual field optical system for high resolution.
Background technology
Wide visual field optical system for high resolution is widely used in the fields such as biological medicine, aerial reconnaissance and mapping.But
Owing to there is the relation of mutually restriction between visual field and resolution, typically only wide cut High-Resolution Map can not be obtained by single exposure
Picture.If fabric width to be increased during high-resolution imaging, the general method using mechanical scanning.But, scanning obtains wide format images and needs
The time wanted is long, and there is time interval between frame and frame, and the most this method is only effective to static scene.Should for some
With, the most persistently monitor, while obtaining big visual field, also to ensure to lose the detailed information of target, and necessary
Complete in the time range of single exposure, face battle array staring imaging can only be used.To obtain greatly simultaneously during the battle array staring imaging of face
Visual field and high-resolution, the pixel number in image planes must reach 1,000,000,000 ranks.And current pixel number on monolithic image sensor
This level can not be reached far away, it is necessary to splice.Image sensor splicing difficulty is big, and directly increase temperature control difficulty and
Difficulty developed by camera.Additionally, consider from optical design angle, the resolving power of lens will be with the resolution phase of 1,000,000,000 pixel image sensors
Coupling, under the conditions of existing technical merit, designs and processes the technological challenge that this lens remain huge.If difference regards
The aberration of position, field is different, and the optical element of composition multiple aperture array will be different, and number is more, processes and designs
Difficulty is the biggest.
On the whole, under current technical conditions, wide visual field high-resolution imaging mainly has three big technological difficulties: 1) when
Pixel number on front monolithic image sensor can not reach far away 1,000,000,000 orders of magnitude that wide visual field high-resolution imaging requires；2) from light
Learn design angle, due to the existence of aberration, design and process the lens combination that the resolving power with 1,000,000,000 pixel image sensors matches
It is extremely difficult；3) quantity of information of the photo obtained due to wide visual field high-resolution imaging is huge, to image transmitting and image
Process and be proposed the highest requirement of real-time, for current technical merit, remain a big technical barrier.
Summary of the invention
For the deficiencies in the prior art, it is an object of the invention to provide a kind of wide visual field optical system for high resolution, carry
The projection lens of the big visual field resolution that can match, and picture on current monolithic image sensor are supplied with 1,000,000,000 pixel image sensors
Under conditions of unit's number can not reach this level far away, by means such as segmentation splicing reconstruct, it is achieved that have 1,000,000,000 pixels
The total solution of complete image of big visual field resolution.The projection lens of the present invention achieves the sphere mapping of optical system
Difference, coma, astigmatism, every aberration such as axial chromatic aberration and multiplying power chromatic aberration all obtains well-corrected, especially to axial chromatic aberration
Second order spectrum correction is good, can reduce again the processing of camera lens, test and fill difficulty and the cost in school.The present invention is applied to raw
The researchs such as thing, heredity, medical treatment and medicine and the development of detection technique, the projection objective that high accuracy big visual field optical detection requires needs
Ask and day by day strengthen, there is the design of the projection objective of wide spectrum, high-resolution, the 3 kinds of performances in big visual field the most simultaneously and manufacture very
Difficulty, the rarest precedent.
The present invention realizes by the following technical solutions: a kind of wide visual field optical system for high resolution, it includes being positioned at object plane
(P1) projection objective one (PRJ1) and between image planes one (P2), wherein, described big visual field high-resolution optics system also includes point
Cut lens arra (LA), imaging lens array (PLA), image sensor array (P3A), signal processing unit, described signal processing list
Unit is electrically connected at image sensor array (P3A)；
Sectioned lens array (LA) uses some sectioned lens array layouts, and imaging lens array (PLA) uses some
Imaging lens array formula layout, image sensor array (P3A) uses some image sensor array layouts, each in these three array
Unit is the most corresponding man-to-man mapping relations；
Sectioned lens array (LA) is positioned at the vicinity of image planes one (P2), and imaging lens array (PLA), image sensor array
(P3A) image planes one (P2) side away from object plane (P1) it is respectively positioned on；Imaging lens array (PLA) is also located at image planes one (P2) and picture
Between sensor array (P3A)；
Object plane (P1) is imaged onto image planes one (P2) by projection objective one (PRJ1), and image planes one (P2) are intermediate image plane, as
Face one (P2) divided lens arra (LA) segmentation composition visual field array, then be imaged onto as sense by imaging lens array (PLA)
The photosurface of device array (P3A), and make image sensor array (P3A) collect image information array, described signal processing unit will
The wide visual field high-resolution that described image information array obtains object plane (P1) by image procossing mode calculates shooting；
Wherein, image planes one (P2) are the concave spherical surface towards object plane (P1)；Sectioned lens array (LA), imaging lens array
(PLA) wait divide view field imaging array each unit with image sensor array (P3A) composition, with the centre of sphere of the concave spherical surface of image planes one (P2) or
Centered by any on close projection objective one (PRJ1) centrage, radially systematicness arrangement；And meet: Sin (α y α
Array) < 0.5NA/ β, α in < NA/ β, 0.8 < Lpout/Rim < 1.2, wherein, α y is to be the master of y at image planes one (P2) place image height
Light and the angle of projection objective one (PRJ1) centrage, α array is point view field imaging array each unit centrage and projection thing
The angle of mirror one (PRJ1) centrage, α in is the chief ray incidence angles of image planes one (P2), and NA is object plane (P1) numerical aperture, and β is
The enlargement ratio of projection objective one (PRJ1), take on the occasion of, Lpout is image planes one (P2) distance of exit pupil, Rim image planes one (P2) recessed
The radius of curvature of sphere.
As the further improvement of such scheme, from object plane (P1) to image planes one (P2), projection objective one (PRJ1) is successively
Including frontal lens group, light-splitting device one (BS1), rear lens group；Described wide visual field optical system for high resolution also includes point
Optical device two (BS2), projection objective two (PRJ2), from object plane (P1) to image planes two (P4), described frontal lens group, light splitting
Device one (BS1), light-splitting device two (BS2), projection objective two (PRJ2) constitute imaging system successively.
Further, during described wide visual field optical system for high resolution also includes illuminator one, illuminator two extremely
Few one, to provide illumination to object plane (P1)；
At least one LED array light source containing the different LED light source of multiple wavelength of described illuminator one and described extremely
Lack at least one corresponding LED light source collecting lens of LED array light source saturating with at least one LED light source optically focused described
Corresponding and also relevant to LED light source wavelength at least one of mirror 2 is to color separation device；Described LED array light source by multiple not
The multiple different spectral energies of the LED light source of co-wavelength pass sequentially through corresponding lamp condenser lens with corresponding 2 to colour annalyzer
Part is pooled to close positions and close direction, and pass sequentially through light-splitting device two (BS2), light-splitting device one (BS1), described before thoroughly
Lens group group is finally projected to object plane (P1)；
Described illuminator two uses laser lighting, and the laser corrugated of described illuminator two is at image planes two (P4) place and picture
Face two (P4) is parallel or is partial to an angle, then passes sequentially through projection objective two (PRJ2), light-splitting device two (BS2), beam splitter
Part one (BS1), described frontal lens group are finally projected to object plane (P1).
Further, the enlargement ratio from object plane (P1) with the imaging system of image planes two (P4) is less than from object plane (P1) and picture
The enlargement ratio of the projection objective one (PRJ1) in face one (P2), described image planes two (P4) place arranges image sensor and signal processing unit
Constituting the camera system of object plane (P1), described image planes two (P4) place image sensor pixel number summation is less than image sensor array (P3A)
Pixel number summation.
As the further improvement of such scheme, described wide visual field optical system for high resolution also include illuminator one,
At least one in illuminator two, to provide illumination to object plane (P1)；
At least one LED array light source containing the different LED light source of multiple wavelength of described illuminator one and described extremely
Lack at least one corresponding LED light source collecting lens of LED array light source saturating with at least one LED light source optically focused described
Mirror corresponding and go back relevant at least one of LED light source wavelength 2 to color separation device；Described LED array light source is by multiple LED light
The different spectral energies in source pass sequentially through corresponding lamp condenser lens and 2 and are pooled to close positions and close side to color separation device
To, and pass sequentially through light-splitting device one (BS1), described frontal lens group is finally projected to object plane (P1)；
Described illuminator two uses laser lighting, described illuminator two to pass sequentially through light-splitting device one (BS1), described
Frontal lens group is finally projected to object plane (P1).
Further, described wide visual field optical system for high resolution includes described illuminator for the moment, described illuminator
One, by the way of timesharing selects and switches switch and the power of different LED light sources, changes the spectrum of illumination light；Described letter
The image information array of the image sensor array (P3A) when number processing unit gathers the illumination light of different spectrum respectively, then by figure
As processing mode obtains the wide visual field high-resolution calculating shooting of object plane (P1).
As the further improvement of such scheme, from object plane (P1) to image planes one (P2), projection objective one (PRJ1) is successively
Including the first mirror group (G1), light-splitting device one (BS1), the second mirror group (G2), the 3rd mirror group (G3)；
In the second mirror group (G2), just meeting relational expression: Vd=(nd-1)/(nF-nC), nd ＜ 1.65 and Vd ＞ 62
A minimum of two of lens, a minimum of one of the minus lens of nd ＞ 1.50 and Vd ＜ 55；Wherein, Vd is abbe number, embodies optics
The constant of the degree of dispersion of material, nF is the F line refractive index of ripple 486nm, and nd is the d line refractive index of ripple 587nm, and nC is ripple
The C line refractive index of 656nm；And at least contain two air-lens meet relational expression: | (r21-r22)/(r21+r22) | <
0.6, | (Vd21-Vd22) | ＞ 28, | (nd21-nd22) | ＞ 0.09；Wherein, r21, r22 are respectively the saturating of air-lens both sides
The radius of curvature on mirror surface, Vd21, Vd22 be 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 faced one another for a pair, and the pair of concave surface one faced one another
Between at least contain a minus lens, and described minus lens contains the concave surface two towards object plane；3rd mirror group (G3) also meets closes
It is formula: at least contain a plus lens and a minus lens meets ndp ＞ ndn, at least contains a plus lens and one negative thoroughly
Mirror meets Vdp ＜ Vdn；Wherein, ndp is the d line refractive index of described plus lens, and ndn is the d line refractive index of described minus lens, Vdp
For the abbe number of described plus lens, Vdn is the abbe number of described minus lens；
Relational expression is met between first mirror group (G1), the second mirror group (G2), the 3rd mirror group (G3) each mirror group: 0.3 < f1/fa <
2.8,0.25 < 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 second mirror
The combined focal length of group (G2), f3 is the combined focal length of the 3rd mirror group (G3), and fa is the combined focal length of whole projection objective.
As the further improvement of such scheme, projection objective one (PRJ1) the resolution of each field positions close
Optical diffraction limit；Point view field imaging array unit has identical optical parametric and an optical element, and can be independent of
Projection objective one (PRJ1) correct for optical aberrations alone, and the unit of sectioned lens array (LA) be square, positive six
Limit shape or rectangle.
Further, the unit of sectioned lens array (LA) is closely arranged along concave spherical surface at image planes one (P2) adnexa
Row, and be connected with each other and be structure as a whole；The concave sphere's center of the arrangement track of the unit of sectioned lens array (LA) and picture
The concave sphere's center position in face one (P2) is identical or close.
As the further improvement of such scheme, the unit of sectioned lens array (LA) is towards the surface of object plane (P1)
Radius of curvature is not more than the surface curvature radius towards imaging lens array (PLA), and sectioned lens array (LA) is saturating in imaging
The unit surface of lens array (PLA) side is sphere, and the sphere center position of each unit sphere is identical.
The invention have the advantages that
1, it is provided that the projection lens of the big visual field resolution that can match with 1,000,000,000 pixel image sensors, and at current list
Under conditions of on sheet image sensor, pixel number can not reach this level far away, by means such as segmentation splicing reconstruct, it is achieved that
There is the total solution of the high-resolution complete image of wide visual field of 1,000,000,000 pixels；
2, there is wide spectrum, high-resolution, 3 kinds, big visual field characteristic simultaneously, the difficulty of design is very big, at present the rarest precedent；
The intermediary image of projection objective 1 has good telecentricity effect, provides good condition for later capture；
3, the diverse location resolution of projection objective one (PRJ1) whole visual field is close to optical diffraction limit, because aberration foot
Enough little, and be sufficiently close to, it is possible to use point view field imaging lens array unit of identical optical parameter and optical element, greatly
The processing of amplitude reduction point view field imaging lens array and the difficulty in dress school and cost；
4, the greatest optical bore of projection objective only has about the 60% of image space full filed bore, considerably reduces projection
The manufacturing cost of object lens and difficulty, and the greatest optical bore of common image space telecentricity projection objective is image space full filed bore
More than 100%, manufacturing cost is high and manufacture difficulty is big；
5, projection objective one (PRJ1) bore is little, does not comprise aspherical lens, considerably reduces processing, detects and fills school
Difficulty and cost；
6, set expandability can be good, it is possible to achieve multiple coaxially falls to penetrating illumination.
Accompanying drawing explanation
The structural representation of the wide visual field optical system for high resolution that Fig. 1 provides for present pre-ferred embodiments.
Fig. 2 is the structural representation of air-lens.
Fig. 3 is axial chromatic aberration curve chart at 0.7 aperture of wide visual field optical system for high resolution in Fig. 1.
Fig. 4 is that in Fig. 1, wide visual field optical system for high resolution is schemed at the transmission function MTF of 480-730nm wave-length coverage.
Fig. 5 is sectioned lens array LA and the combination of image sensor array P3A of wide visual field optical system for high resolution in Fig. 1
Schematic diagram.
Fig. 6 to Fig. 5 is similar, for the sectioned lens array LA of wide visual field optical system for high resolution in Fig. 1 and image sensor battle array
The another kind of row P3A combines schematic diagram.
Detailed description of the invention
In order to make the purpose of the present invention, technical scheme and advantage clearer, below in conjunction with drawings and Examples, right
The present invention is further elaborated.Should be appreciated that specific embodiment described herein only in order to explain the present invention, and
It is not used in the restriction present invention.
Refer to Fig. 1, the structural representation of its wide visual field optical system for high resolution provided for present pre-ferred embodiments
Figure.One P2 from object plane P1 to image planes, wide visual field optical system for high resolution includes projection objective one PRJ1, sectioned lens battle array successively
Row LA, imaging lens array PLA, image sensor array P3A, signal processing unit, described signal processing unit is electrically connected at picture
Sensor array P3A.
One P2 from object plane P1 to image planes, projection objective one PRJ1 include successively frontal lens group, light-splitting device one BS1, after
Lens group.Frontal lens group includes the first mirror group G1, and rear lens group includes 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 use openings of sizes adjustable optical
Door screen.Image planes one P2
One P2 from object plane P1 to image planes, the first mirror group G1 can include the first lens L1, the second lens L2, the 3rd lens successively
L3, the 4th lens L4.Second mirror group G2 can include that at least two lens with negative power and at least one of which lens are
Biconcave lens；May also include and there are at least three lens of positive light coke and two lens of at least a part of which are biconvex lens.At this
In embodiment, one P2 from object plane P1 to image planes, the second mirror group G2 includes the 5th lens L5, the 6th lens L6, the 7th saturating successively
Mirror L7, the 8th lens L8, the 9th lens L9, the tenth lens L10, the 11st lens L11.3rd mirror group G3 can include having negative light
At least two lens of focal power；May also include and there are at least two lens of positive light coke and include that at least one crescent is saturating
Mirror.In the present embodiment, one P2 from object plane P1 to image planes, the 3rd mirror group G3 includes the 12nd lens L12, the 13rd saturating successively
Mirror L13, the 14th lens L14, the 15th lens L15, the 16th lens L16, the 17th lens L17.
Wherein, the first lens L1, the 3rd lens L3, the 6th lens L6, the 9th lens L9, the 13rd lens L13, the 14th
Lens L14, the 15th lens L15 are respectively provided with 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 11st lens L11, the 12nd lens L12, the 16th lens L16, the 17th saturating
Mirror L17 is respectively provided with positive light coke.In the present embodiment, the component parameters of the first to the 17th lens L1～L17 such as table 1 institute
Show.
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, the 3rd mirror group G3 each mirror group,
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 second mirror group G2
Combined focal length, 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
So that the spherical aberration of projection objective, coma, astigmatism, filed curvature and distortion, axial chromatic aberration and multiplying power chromatic aberration etc. are every
Aberration is the most 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 contain a plus lens and a minus lens meets: ndp ＞ ndn, at least contain one
Individual plus lens and a minus lens meet: Vdp ＜ Vdn.Wherein, ndp is the d line refractive index of described plus lens, and ndn is described negative
The d line refractive index of lens, Vdp is the abbe number of described plus lens, and Vdn is the abbe number of described minus lens.First mirror group
The Main Function that G1 so designs is primary and the high-order spherical aberration of correction projection objective, the two of the axial chromatic aberration of balance projection objective
Level spectrum aberration, 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 Vd ＞ 62
A minimum of two of plus lens；3. a minimum of one of the minus lens of nd ＞ 1.50 and Vd ＜ 55；The most at least contain two air-lens
Meet relational expression: | (r21-r22)/(r21+r22) | < 0.6, | (Vd21-Vd22) | ＞ 28, | (nd21-nd22) | ＞ 0.09.Its
In, Vd is abbe number, the constant embodying the degree of dispersion of optical material, and nF is the F line refractive index of ripple 486nm, and nd is ripple
The d line refractive index of 587nm, nC is the C line refractive index of ripple 656nm；R21, r22 are respectively the lens measure of air-lens both sides
The radius of curvature in face, Vd21, Vd22 be respectively the abbe number of the lens of air-lens both sides, and nd21, nd22 are respectively air
The d line refractive index of the lens of the both sides of lens.
For air-lens, in the lens group constituting camera lens, the air being clipped in the middle by adjacent two glass lens is empty
Between (air space) L can regard the lens as refractive index 1.0 as, the air space designed in view of this consideration can be described as air
Lens, air-lens L as shown in Figure 2.Before and after air-lens L index of refraction relationship be respectively with adjacent glass lens Lx,
Ly is contrary, and therefore convex surface has concavees lens effect, and concave surface has the effect of convex lens.Referring to Fig. 1, this embodiment party
4. article in formula, between lens L6, L7 of the second mirror group L2, between lens L8, L9, all exist between lens L9, L10 and meet the
That is: | (r21-r22)/(r21+r22) | < 0.6, | (Vd21-Vd22) | ＞ 28, | (nd21-nd22) | the air-lens of ＞ 0.09.
Such as relational expression, the value of calculation of | (r21-r22)/(r21+r22) | is respectively 0.211,0.282 and 0.150, meets relational expression |
(r21-r22)/(r21+r22)|<0.6.Main Function is the correction primary of projection objective and high-order spherical aberration and coma, school simultaneously
The axial chromatic aberration of orthographic projection object lens is also effectively reduced its second order spectrum aberration；It is effectively reduced Po Zi cut down (Petzval) and make
The curvature of the image obtaining projection objective can obtain well-corrected.
The of second mirror group L2 be 5. article i.e.: the second mirror group G2 at least contains two plus lens and meets at ambient temperature: dn/
Dt ＜ 0.Different from dn/dt ＞ 0 characteristic of general optical glass material, when having plus lens to meet dn/dt ＜ 0, with other one
As the characteristic of thermal refractive index coefficient of optical glass lens contrary, cancel each other, it is possible to improve the heat of projection objective
Stability, makes projection objective when variation of ambient temperature, and its image planes position and image quality keep stable.
In the 3rd mirror group G3, containing the concave surface one faced one another for a pair, and the pair of concave surface one faced one another it
Between at least contain a minus lens, and described minus lens contains the concave surface two towards object plane P1.3rd mirror group G3 also meets relation
Formula: at least contain a plus lens and a minus lens meets ndp ＞ ndn, at least contain a plus lens and a minus lens
Meet Vdp ＜ Vdn.The Main Function that 3rd mirror group G3 so designs is the primary and senior astigmatism of balance projection objective and helps
In the second order spectrum aberration of reduction axial chromatic aberration, the ratio chromatism, of balance projection objective.In the present embodiment, the 13rd lens
There is the concave surface one faced one another for a pair between L13 and the 15th lens L15, the i.e. the 13rd lens L13 is towards the 15th lens
The curved surface of L15 is concave surface, and the 15th lens L15 is also concave surface towards the curved surface of the 13rd lens L13.At this to facing one another
Existing for the 14th lens L14 of minus lens between concave surface one, the 14th lens L14 contains the concave surface two towards object plane P1, i.e.
14th lens L14 is also concave surface towards the curved surface of object plane P1.
In order to eliminate the internal stress of optical glass, thermal stress and aging, and the harmful effect that optical imagery is caused,
Keeping the stability of projection objective, all lens surfaces in the first mirror group G1, the second mirror group G2, the 3rd mirror group G3 are sphere,
Not containing aspheric surface, the second mirror group G2, the 3rd mirror group G3 are the simple lens composition not containing cemented surface.It addition, do not comprise non-
Spherical lens, can be greatly lowered processing, detects and fill difficulty and the cost in school.
In order to good image space telecentricity projection objective effect can be obtained, provide good condition for later capture, as
Face one P2 has the concave spherical surface towards object plane P1, and meets: α in < NA/ β, and 0.8 < Lpout/Rim < 1.2；Wherein, α in is projection
The chief ray of object lens is at the angle of incidence of image planes one P2, and NA is the object-side numerical aperture of projection objective, and β is the times magnification of projection objective
Rate, Lpout is projection objective image space distance of exit pupil, the radius of curvature of 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 region: 470-
750nm.Wherein, β is projection multiplying power, 4 < β < 18；NA is object plane opening number；Hy is that maximum thing is high.
Light-splitting device one BS1 (in the present embodiment, beam splitter it is provided with between the first mirror group G1 and the 3rd mirror group G3
Part 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
For light-splitting device one BS1 thickness, Dop is the maximum clear aperture of light-splitting device one BS1, and light-splitting device one BS1 is for having part
Transmission and partially reflective divided beams device, its Main Function is available with light-splitting device one BS1 partially transmitted and partially
The light splitting function of reflection, it is achieved various coaxially fall to penetrating illumination.
For the conservative control cost of wide visual field high-resolution projection objective, and obtain optimal cost performance, described wide visual field
The lens total quantity of high-resolution projection objective is between 12 to 28.
In a word, in the present embodiment, three lens cluster uses such lens structure finally guarantee and achieve projection thing
The spherical aberration of mirror, coma, astigmatism, filed curvature and distortion, every aberration such as axial chromatic aberration and multiplying power chromatic aberration all obtains
Well-corrected, can effectively control the greatest optical bore of camera lens simultaneously, reduces the processing of camera lens, test and fill school difficulty and
Cost.
The wide visual field high-resolution projection objective of present embodiment, the axial chromatic aberration of wide visual field high-resolution projection objective is such as
Shown in Fig. 3, in the range of broad band, effectively correct axial chromatic aberration, cover 480-730nm wave-length coverage.From figure permissible
Finding out, the present invention can effectively obtain high imaging quality.The projection objective of wide visual field high-resolution projection objective is at 480-
The transmission function MTF of 730nm wave-length coverage schemes as shown in Figure 4.Wave aberration WFE (RMS) of the analysis of specialty optics design software
Result shows: less than the 1/14 of wave aberration WFE (RMS) its wavelength all of each 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 | Wave-length coverage | 1/15λ |
Therefore, the present invention has wide spectrum, high-resolution, 3 kinds, big visual field characteristic simultaneously, at present the rarest precedent；Have good
Good image space telecentricity projection objective effect, provides good condition for later capture；The greatest optical bore of projection objective is only
Have about the 60% of image space full filed bore, considerably reduce manufacturing cost and the difficulty of projection objective.And commonly image space is remote
The greatest optical bore of heart projection objective is more than the 100% of image space full filed bore, and manufacturing cost is high and manufacture difficulty is big；
Eyeglass bore is little, does not comprise aspherical lens, considerably reduces processing, detects and fill difficulty and the cost in school；Can utilize
The light splitting function partially transmitted and partially reflected of light-splitting device one BS1, it is achieved various coaxially fall to penetrating illumination.
Sectioned lens array LA uses some sectioned lens array layouts, and imaging lens array PLA uses some imagings
Lens array column layout, image sensor array P3A uses some image sensor array layouts, and each unit in these three array is
The most corresponding man-to-man mapping relations.
Sectioned lens array LA is positioned at the vicinity of image planes one P2, and imaging lens array PLA, the equal position of image sensor array P3A
In image planes one P2 away from the side of object plane P1, imaging lens array PLA is also located between image planes one P2 and image sensor array P3A.
Specifically, sectioned lens array LA is positioned at the neighbouring finger of image planes one P2: sectioned lens array LA can be located 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.
Image planes one P2 divided lens arra LA segmentation composition visual field array, makes object plane P1 by imaging lens array PLA
It is imaged onto the photosurface of image sensor array P3A, and makes image sensor array P3A collect image information array, described signal processing
Described image information array is obtained wide visual field high score in image procossing mode (such as Registration and connection, calculating reconstruction mode etc.) by unit
Resolution calculates shooting.
Projection objective one PRJ1 each field positions there is close aberration characteristic, point view field imaging array each
Unit has and has identical optical parametric and structure.
In the present embodiment, image planes one P2 could be an upwardly facing the concave spherical surface of object plane P1, and meets:
Sin (α y α array) < 0.5NA/ β,
α in < NA/ β,
0.8 < Lpout/Rim < 1.2,
Wherein, α y is that image height is the chief ray angle with projection objective one PRJ1 centrage of y at image planes one P2,
α array is the angle of point view field imaging array each unit centrage and projection objective one PRJ1 centrage,
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 distances 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 be along the concave spherical surface close-packed arrays of image planes one P2, and sectioned lens array
The concave sphere's center of the arrangement track of the unit of 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 towards imaging len battle array towards the surface curvature radius of object plane P1
The surface curvature radius of row PLA.The unit of sectioned lens array LA can be identical square, regular hexagon or rectangular
Shape, and be connected with each other and be structure as a whole.Sectioned lens array LA and the combination of image sensor array P3A, refer to Fig. 5 and figure
6, it is sectioned lens array LA and two kinds of combinations of image sensor array P3A, all available effect reaching the present invention.Imaging
The unit of lens arra PLA and image sensor array P3A can have separate position and focal plane governor motion.
Two P4 from object plane P1 to image planes, wide visual field optical system for high resolution includes frontal lens group (the i.e. first mirror successively
Group G1), light-splitting device one BS1, light-splitting device two BS2, projection objective two PRJ2.Two P4 from object plane P1 to image planes, the first mirror group
G1, light-splitting device one BS1, light-splitting device two BS2, projection objective two PRJ2 constitute second imaging system successively.First one-tenth
As the structure of system is presented hereinbefore: one P2 from object plane P1 to image planes, wide visual field optical system for high resolution includes throwing successively
Shadow object lens one PRJ1, sectioned lens array LA, imaging lens array PLA, image sensor array P3A, signal processing unit.Second
Image sensor is installed at image planes two P4 of imaging system, the calculating shooting of the image information gathered than image sensor array P3A can be obtained
More rapid capture speed.
The wide visual field optical system for high resolution of the present invention passes through two imaging systems, can arbitrarily switch one of them
As system carries out imaging.Two imaging systems make to constitute between object plane P1 and image planes one P2, image planes two P4 conjugate imaging relation, and two
Individual imaging system can have different projection multiplying powers, the first mirror group G1 to be that both are public.
In addition, object plane P1 can also use illuminator to pass through the second imaging system to import and need imaging and focusing
Other illumination light.As, in the present embodiment, described wide visual field optical system for high resolution also includes providing illumination to object plane P1
Illuminator LS.Illuminator LS can provide multiple spectrum illumination light, by light-splitting device and the portion of projection objective one PRJ1
Point lens, project object plane P1 by illumination light along the centerline direction of projection objective one PRJ1, provide illumination for object plane P1.
Specifically, illuminator LS can at least one LED array light source containing the different LED light source of multiple wavelength and
At least one LED light source collecting lens that at least one LED array light source described is corresponding and at least one LED light source described
Collecting lens corresponding and go back relevant at least one of LED light source wavelength corresponding 2 to color separation device.In present embodiment
In, the quantity of LED array light source is illustrated as a example by three: LS1, LS2, LS3, with these three LED array light source pair
Answering, 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 energies of the LED light source of multiple different wave lengths are passed sequentially through corresponding light by LED array light source
Lamp condenser lens is pooled to close positions and close direction with corresponding 2 to color separation device, and passes sequentially through light-splitting device two
BS2, light-splitting device one BS1, the first mirror group G1 are finally projected to object plane P1.Illuminator LS is selected by timesharing and switches difference
The switch of LED light source and strong and weak mode, change the spectrum of illumination light.Described signal processing unit gathers respectively does not share the same light
The image information array of the image sensor array P3A during illumination light composed, then by image procossing mode (such as Registration and connection, calculating
Reconstruction mode etc.) obtain object plane P1 wide visual field high-resolution calculate shooting.
Certainly, in other embodiments, described illuminator can also use laser lighting, described illuminator two
Laser corrugated is or deflection one angle parallel with image planes two P4 at image planes two P4, then passes sequentially through projection objective two PRJ2, divides
Optical device two BS2, light-splitting device one BS1, the first mirror group G1 are finally projected to object plane P1.
Certainly, in other embodiments, the second imaging system can be not provided with, now, and described wide visual field high-resolution
Optical system can also select at least one for providing illumination to object plane P1 in illuminator one with illuminator two.If institute
Stating illuminator one, now, the multiple different spectral energies of the LED light source of multiple different wave lengths are led to by LED array light source successively
Cross corresponding lamp condenser lens and be pooled to close positions and close direction with corresponding 2 to color separation device, and pass sequentially through point
Optical device one BS1, described frontal lens group are finally projected to object plane P1.If described illuminator two, now, pass sequentially through light splitting
Device one BS1, described frontal lens group are finally projected to object plane P1.
In sum, beneficial effects of the present invention is as follows:
1, there is wide spectrum, high-resolution, 3 kinds, big visual field characteristic simultaneously, the difficulty of design is very big, at present the rarest precedent；
2, the intermediary image of projection objective 1 has good telecentricity effect, provides good condition for later capture；
3, the greatest optical bore of projection objective only has about the 60% of image space full filed bore, considerably reduces projection
The manufacturing cost of object lens and difficulty, and the greatest optical bore of common image space telecentricity projection objective is image space full filed bore
More than 100%, manufacturing cost is high and manufacture difficulty is big；
4, projection objective one PRJ1 bore is little, does not comprise aspherical lens, considerably reduces processing, detects and fills school
Difficulty and cost；
5, the aberration of the diverse location of the whole visual field of projection objective one PRJ1 is sufficiently close to, and close to diffraction limit, permissible
Use identical point view field imaging lens array unit, considerably reduce point processing of view field imaging lens array and fill school
Difficulty and cost；
6, set expandability can be good, it is possible to achieve multiple coaxially falls to penetrating illumination.
The foregoing is only presently preferred embodiments of the present invention, not in order to limit the present invention, all essences in the present invention
Any amendment, equivalent and the improvement etc. made within god and principle, should be included within the scope of the present invention.
Claims (10)
1. a wide visual field optical system for high resolution, it includes the projection objective being positioned between object plane (P1) and image planes one (P2)
One (PRJ1), it is characterised in that: described wide visual field optical system for high resolution also includes sectioned lens array (LA), imaging len
Array (RLA), image sensor array (P3A), signal processing unit, described signal processing unit is electrically connected at image sensor array
(P3A)；
Sectioned lens array (LA) uses some sectioned lens array layouts, and imaging lens array (RLA) uses some imagings
Lens array column layout, image sensor array (P3A) uses some image sensor array layouts, each unit in these three array
For the most corresponding man-to-man mapping relations；
Sectioned lens array (LA) is positioned at the vicinity of image planes one (P2), and imaging lens array (RLA), image sensor array (P3A)
It is respectively positioned on the image planes one (P2) side away from object plane (P1)；Imaging lens array (RLA) is also located at image planes one (P2) and image sensor
Between array (P3A)；
Object plane (P1) is imaged onto image planes one (P2) by projection objective one (PRJ1), and image planes one (P2) are intermediate image plane, image planes one
(P2) divided lens arra (LA) segmentation composition visual field array, then it is imaged onto image sensor battle array by imaging lens array (RLA)
The photosurface of row (P3A), and make image sensor array (P3A) collect image information array, described signal processing unit is by described
The wide visual field high-resolution that image information array obtains object plane (P1) by image procossing mode calculates shooting；
Wherein, image planes one (P2) are the concave spherical surface towards object plane (P1)；Sectioned lens array (LA), imaging lens array (RLA)
Point view field imaging array each unit is waited, with the centre of sphere or close of the concave spherical surface of image planes one (P2) with image sensor array (P3A) composition
Projection objective one (PRJ1) centrage on a little centered by, radially systematicness arrangement；And meet:
Sin (α y α array) < 0.5NA/ β,
α in < NA/ β,
0.8 < Lpout/Rim < 1.2,
Wherein, α y is the angle at the chief ray that image planes one (P2) place image height is y Yu projection objective one (PRJ1) centrage,
α array is the angle of point view field imaging array each unit centrage and projection objective one (PRJ1) centrage,
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 projection objective one (PRJ1), take on the occasion of,
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).
2. wide visual field optical system for high resolution as claimed in claim 1, it is characterised in that: from object plane (P1) to image planes one
(P2), projection objective one (PRJ1) includes frontal lens group, light-splitting device one (BS1), rear lens group successively；Described wide visual field
Optical system for high resolution also includes light-splitting device two (BS2), projection objective two (PRJ2), from object plane (P1) to image planes two
(P4), described frontal lens group, light-splitting device one (BS1), light-splitting device two (BS2), projection objective two (PRJ2) are constituted successively
Imaging system.
3. wide visual field optical system for high resolution as claimed in claim 2, it is characterised in that: described wide visual field high-resolution light
System also includes at least one in illuminator one, illuminator two, to provide illumination to object plane (P1)；
Described illuminator one contains at least one LED array light source and described at least of the different LED light source of multiple wavelength
At least one LED light source collecting lens that individual LED array light source is corresponding and at least one LED light source collecting lens phase described
Corresponding and also relevant to LED light source wavelength at least one 2 is to color separation device；Described LED array light source is by multiple different ripples
The multiple different spectral energies of long LED light source pass sequentially through corresponding lamp condenser lens and converge to color separation device with corresponding 2
Collection is to close positions and close direction, and passes sequentially through light-splitting device two (BS2), light-splitting device one (BS1), described frontal lens group
Group is finally projected to object plane (P1)；
Described illuminator two uses laser lighting, and the laser corrugated of described illuminator two is in image planes two (P4) place and image planes two
(P4) parallel or one angle of deflection, then passes sequentially through projection objective two (PRJ2), light-splitting device two (BS2), light-splitting device one
(BS1), described frontal lens group is finally projected to object plane (P1).
4. wide visual field optical system for high resolution as claimed in claim 3, it is characterised in that: from object plane (P1) and image planes two
(P4) enlargement ratio of imaging system is less than from the times magnification of object plane (P1) Yu the projection objective one (PRJ1) of image planes one (P2)
Rate, described image planes two (P4) place arranges image sensor and the camera system of signal processing unit composition object plane (P1), described image planes two
(P4) place's image sensor pixel number summation is less than the pixel number summation of image sensor array (P3A).
5. wide visual field optical system for high resolution as claimed in claim 2, it is characterised in that: described wide visual field high-resolution light
System also includes at least one in illuminator one, illuminator two, to provide illumination to object plane (P1)；
Described illuminator one contains at least one LED array light source and described at least of the different LED light source of multiple wavelength
At least one LED light source collecting lens that individual LED array light source is corresponding and at least one LED light source collecting lens phase described
Corresponding and also relevant to LED light source wavelength at least one 2 is to color separation device；Described LED array light source is by multiple LED light sources
Different spectral energies pass sequentially through corresponding lamp condenser lens and 2 and be pooled to close positions and close side to color separation device
To, and pass sequentially through light-splitting device one (BS1), described frontal lens group is finally projected to object plane (P1)；
Described illuminator two use laser lighting, described illuminator two pass sequentially through light-splitting device one (BS1), described before thoroughly
Lens group group is finally projected to object plane (P1).
6. the wide visual field optical system for high resolution as described in claim 3 or 4 or 5, it is characterised in that: described wide visual field high score
Resolution optical system includes described illuminator for the moment, and described illuminator one is selected by timesharing and switches different LED light
The switch in source and strong and weak mode, change the spectrum of illumination light；Described signal processing unit gathers the photograph of different spectrum respectively
The image information array of the image sensor array (P3A) during Mingguang City, then the wide visual field of object plane (P1) is obtained by image procossing mode
High-resolution calculates shooting.
7. wide visual field optical system for high resolution as claimed in claim 1, it is characterised in that: from object plane (P1) to image planes one
(P2), projection objective one (PRJ1) includes the first mirror group (G1), light-splitting device one (BS1), the second mirror group (G2), the 3rd mirror successively
Group (G3)；
In the second mirror group (G2), meet the plus lens of relational expression: Vd=(nd-1)/(nF-nC), nd ＜ 1.65 and Vd ＞ 62
A minimum of two, a minimum of one of the minus lens of nd ＞ 1.50 and Vd ＜ 55；Wherein, Vd is abbe number, embodies optical material
The constant of degree of dispersion, nF is the F line refractive index of ripple 486nm, and nd is the d line refractive index of ripple 587nm, and nC is ripple
The C line refractive index of 656nm；And at least contain two air-lens and meet relational expression: | (r21-r22)/(r21+r22) | < 0.6, |
(Vd21-Vd22) | ＞ 28, | (nd21-nd22) | ＞ 0.09；Wherein, r21, r22 are respectively the lens surface of air-lens both sides
Radius of curvature, Vd21, Vd22 be respectively the abbe number of the lens of air-lens both sides, and it is saturating that nd21, nd22 are respectively air
The d line refractive index of the lens of the both sides of mirror；
In the 3rd mirror group (G3), containing the concave surface one faced one another for a pair, and between the pair of concave surface one faced one another
At least contain a minus lens, and described minus lens contains the concave surface two towards object plane；3rd mirror group (G3) also meets relational expression:
At least contain a plus lens and a minus lens meets ndp ＞ ndn, at least contain a plus lens and a minus lens meets
Vdp ＜ Vdn；Wherein, ndp is the d line refractive index of described plus lens, and ndn is the d line refractive index of described minus lens, and Vdp is described
The abbe number of plus lens, Vdn is the abbe number of described minus lens；
Relational expression is met: 0.3 < f1/fa < 2.8 between first mirror group (G1), the second mirror group (G2), the 3rd mirror group (G3) each mirror group,
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 second mirror group
(G2) combined focal length, f3 is the combined focal length of the 3rd mirror group (G3), and fa is the combined focal length of whole projection objective one.
8. wide visual field optical system for high resolution as claimed in claim 1, it is characterised in that: projection objective one (PRJ1)
The resolution of each field positions is close to optical diffraction limit；View field imaging array unit is divided to have identical optical parametric
And optical element, and can be independent of projection objective one (PRJ1) correct for optical aberrations alone, and sectioned lens array (LA)
Unit is square, regular hexagon or rectangle.
9. wide visual field optical system for high resolution as claimed in claim 7 or 8, it is characterised in that: sectioned lens array (LA)
Unit at image planes one (P2) adnexa along concave spherical surface close-packed arrays, and be connected with each other and be structure as a whole；Sectioned lens battle array
The concave sphere's center of the arrangement track of the unit of row (LA) is identical or close with the concave sphere's center position of image planes one (P2).
10. wide visual field optical system for high resolution as claimed in claim 1, it is characterised in that: sectioned lens array (LA)
Unit is not more than the surface curvature radius towards imaging lens array (RLA) towards the surface curvature radius of object plane (P1),
And sectioned lens array (LA) is sphere on the unit surface of imaging lens array (RLA) side, and the ball of each unit sphere
Heart position is identical.
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| CN106973203B (en) * | 2017-04-21 | 2020-11-17 | 华为机器有限公司 | Camera module |
| CN113126282B (en) * | 2019-12-30 | 2022-09-27 | 张家港中贺自动化科技有限公司 | Wide-spectrum large-view-field optical system |
| CN113126311B (en) * | 2019-12-30 | 2022-09-27 | 张家港中贺自动化科技有限公司 | Wide-spectral-line high-resolution optical system |
| CN114859515B (en) * | 2022-05-23 | 2024-01-12 | 张家港中贺自动化科技有限公司 | Catadioptric objective optical system for projection lithography and projection lithography system |
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Denomination of invention: An optical system with wide field of view and high resolution Effective date of registration: 20230209 Granted publication date: 20170111 Pledgee: Bank of China Limited Zhangjiagang branch Pledgor: ZHANGJIAGANG ZHONGHE AUTOMATION TECHNOLOGY CO.,LTD. Registration number: Y2023980032319 |