CN108107654A - Projection optics system - Google Patents
Projection optics system Download PDFInfo
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- CN108107654A CN108107654A CN201810140335.1A CN201810140335A CN108107654A CN 108107654 A CN108107654 A CN 108107654A CN 201810140335 A CN201810140335 A CN 201810140335A CN 108107654 A CN108107654 A CN 108107654A
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- 239000000571 coke Substances 0.000 claims abstract description 10
- 101100532514 Arabidopsis thaliana SAG21 gene Proteins 0.000 claims description 13
- 238000003384 imaging method Methods 0.000 description 9
- 238000010586 diagram Methods 0.000 description 8
- 230000004075 alteration Effects 0.000 description 7
- 238000005516 engineering process Methods 0.000 description 5
- 239000000463 material Substances 0.000 description 4
- 230000000007 visual effect Effects 0.000 description 4
- 230000009286 beneficial effect Effects 0.000 description 3
- 238000000034 method Methods 0.000 description 3
- 201000009310 astigmatism Diseases 0.000 description 2
- 230000008901 benefit Effects 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000009738 saturating Methods 0.000 description 2
- 230000003321 amplification Effects 0.000 description 1
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Classifications
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- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03B—APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR
- G03B21/00—Projectors or projection-type viewers; Accessories therefor
- G03B21/14—Details
- G03B21/142—Adjusting of projection optics
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B13/00—Optical objectives specially designed for the purposes specified below
- G02B13/001—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras
- G02B13/0015—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras characterised by the lens design
- G02B13/002—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras characterised by the lens design having at least one aspherical surface
- G02B13/003—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras characterised by the lens design having at least one aspherical surface having two lenses
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Abstract
This application discloses a kind of projection optics system, which is extremely sequentially included along optical axis by image source side into image side：First lens and the second lens.First lens have positive light coke, are convex surface closely into image side surface；Second lens have negative power, and nearly image source side is concave surface, are convex surface closely into image side surface.First lens meet 0.5 ＜ CT1/CT2 ＜ 1 in the center thickness CT1 on optical axis and the second lens in the center thickness CT2 on optical axis.
Description
Technical field
This application involves a kind of projection optics system, more specifically, this application involves a kind of projections for including two panels lens
Optical system.
Background technology
In recent years, with the continuous progress of science and technology, interactive device progressively rises, and the application range of projection lens is also increasingly
Extensively.Nowadays, chip technology is quickly grown with intelligent algorithm, is projected image to space object using optical projection lens and received and is somebody's turn to do
Picture signal, you can calculate the 3-D view with object space depth information.Specific method is as follows：Utilize optical projection mirror
Head projects the light that infra-red laser diode (LD) or vertical cavity surface emitting laser (VCSEL) are sent to target object direction；
Projected light beam is realizing redistribution of the projected image on target object after diffractive-optical element (DOE)；Utilize camera shooting
The image that camera lens is projected onto on object receives, you can calculates comprising the 3-D view for being projected object space depth information.
3-D view with depth information can be further used for a variety of good application exploitations such as bio-identification.
In general, the projection lens for being conventionally used to imaging eliminates various aberrations simultaneously by using the mode for increasing lens numbers
Improve resolution ratio.But the optics total length (TTL) of projection lens can so be caused to increase, and lens assembling needs lens barrel etc.
Supports so that the overall volume of camera lens is larger, is unfavorable for the miniaturization of camera lens.In addition, traditional lens construction can not
Realize the non-boundary arrangement between each camera lens in array lens.
The content of the invention
This application provides be applicable to portable electronic product, can at least solve or part solve it is of the prior art
The projection optics system of above-mentioned at least one shortcoming.
On the one hand, this application provides such a projection optics system, the projection optics system is along optical axis by image source
Side extremely sequentially includes into image side：First lens and the second lens.First lens can have positive light coke, closely can be into image side surface
Convex surface；Second lens can have negative power, and nearly image source side can be concave surface, can be convex surface closely into image side surface.Wherein, first
Lens can meet 0.5 ＜ CT1/CT2 ＜ in the center thickness CT1 on optical axis and the second lens in the center thickness CT2 on optical axis
1。
In one embodiment, the image source face of projection optics system to the nearly image source side of the first lens is on optical axis
Distance TR and the nearly distance Tr1r4 into image side surface on optical axis of nearly image source side to the second lens of the first lens can meet
0.7 ＜ TR/Tr1r4 ＜ 1.3.
In one embodiment, spacing distance T12 on optical axis of the first lens and the second lens, the first lens are in light
Center thickness CT1 and the second lens on axis can meet T12/ (CT1+CT2) ＜ 0.5 in the center thickness CT2 on optical axis.
In one embodiment, maximum half bore DT11 of nearly image source side of the first lens and the nearly picture of the second lens
Maximum half bore DT21 in source face can meet 0.6 ＜ DT11/DT21 ＜ 1.
In one embodiment, 3 and second lens of radius of curvature R of the nearly image source side of the second lens is near into image side
The radius of curvature R 4 in face can meet 0.3 ＜ R3/R4 ＜ 0.8.
In one embodiment, the nearly image source side of the second lens and the intersection point of optical axis are to the nearly image source side of the second lens
On axis between the effective half bore vertex of maximum in face distance SAG21 and the second lens it is near into the intersection point of image side surface and optical axis extremely
Distance SAG22 can meet 0.5 ＜ SAG21/ on axis between the nearly effective half bore vertex of maximum into image side surface of second lens
SAG22 ＜ 1.
In one embodiment, the nearly radius of curvature R 2 into image side surface of the first lens and always having for projection optics system
Effect focal length f can meet -0.5 ＜ R2/f ＜ 0.
In one embodiment, the minimal wave length of the practical application wavelength X of projection optics system is than use light source
The short 0nm-100nm of minimal wave length, the most long wavelength of the practical application wavelength X of projection optics system is than the most long wave using light source
Long 0nm-100nm.
In one embodiment, the maximum angle of half field-of view HFOV of projection optics system can meet TAN (HFOV) ＜ 0.23.
In one embodiment, the object-side numerical aperture NA of projection optics system can meet NA >=0.18.
In one embodiment, the maximum incident angle degree CRAmax of the chief ray of projection optics system meets CRAmax ＜
10°。
On the other hand, present invention also provides such a projection optics system, the projection optics system along optical axis by
Image source side extremely sequentially includes into image side：First lens and the second lens.First lens can have positive light coke, closely into image side surface
It can be convex surface；Second lens can have negative power, and nearly image source side can be concave surface, can be convex surface closely into image side surface.Wherein,
Spacing distance T12, the first lens of first lens and the second lens on optical axis are saturating in the center thickness CT1 and second on optical axis
Mirror can meet T12/ (CT1+CT2) ＜ 0.5 in the center thickness CT2 on optical axis.
The application employs multiple (for example, two) lens, by each power of lens of reasonable distribution, face type, each
Spacing etc. on axis between the center thickness of mirror and each lens so that above-mentioned projection optics system has miniaturization, high imaging
The advantageous effects such as quality.Meanwhile the projection optics system of above-mentioned configuration is suitable for unicast long-wave band.
Description of the drawings
With reference to attached drawing, by the detailed description of following non-limiting embodiment, other features of the application, purpose and excellent
Point will be apparent.In the accompanying drawings：
Fig. 1 shows the structure diagram of the projection optics system according to the embodiment of the present application 1；
Fig. 2 shows the distortion curve of the projection optics system of embodiment 1；
Fig. 3 shows the structure diagram of the projection optics system according to the embodiment of the present application 2；
Fig. 4 shows the distortion curve of the projection optics system of embodiment 2；
Fig. 5 shows the structure diagram of the projection optics system according to the embodiment of the present application 3；
Fig. 6 shows the distortion curve of the projection optics system of embodiment 3；
Fig. 7 shows the structure diagram of the projection optics system according to the embodiment of the present application 4；
Fig. 8 shows the distortion curve of the projection optics system of embodiment 4.
Specific embodiment
Refer to the attached drawing is made more detailed description by the application in order to better understand to the various aspects of the application.It should
Understand, these are described in detail the simply description of the illustrative embodiments to the application rather than limit the application in any way
Scope.In the specification, the identical element of identical reference numbers.Stating "and/or" includes associated institute
Any and all combinations of one or more of list of items.
It should be noted that in the present specification, the statement of first, second grade is only used for a feature and another feature differentiation
It comes, and does not indicate that any restrictions to feature.Therefore, it is discussed below in the case of without departing substantially from teachings of the present application
First lens are also known as the second lens, and the second lens are also known as the first lens.
In the accompanying drawings, for convenience of description, thickness, the size and shape of lens are slightly exaggerated.Specifically, attached drawing
Shown in spherical surface or aspherical shape be illustrated by way of example.That is, spherical surface or aspherical shape is not limited to attached drawing
In the spherical surface that shows or aspherical shape.Attached drawing is merely illustrative and and non-critical drawn to scale.
Herein, near axis area refers to the region near optical axis.If lens surface is convex surface and does not define convex surface position
When putting, then it represents that the lens surface is convex surface near axis area is less than；If lens surface is concave surface and does not define the concave surface position
When, then it represents that the lens surface is concave surface near axis area is less than.Each lens are known as nearly image source side close to the surface of image source side
Face, each lens are known as close to the surface into image side closely into image side surface.
It will also be appreciated that term " comprising ", " including ", " having ", "comprising" and/or " including ", when in this theory
It represents there is stated feature, element and/or component when being used in bright book, but does not preclude the presence or addition of one or more
Other feature, element, component and/or combination thereof.In addition, ought the statement of such as " ... at least one " appear in institute
When after the list of row feature, the individual component in entire listed feature rather than modification list is modified.In addition, work as description originally
During the embodiment of application, represented " one or more embodiments of the application " using "available".Also, term " illustrative "
It is intended to refer to example or illustration.
Unless otherwise defined, otherwise all terms used herein be respectively provided with (including technical terms and scientific words) with
The application one skilled in the art's is generally understood identical meaning.It will also be appreciated that term (such as in everyday words
Term defined in allusion quotation) meaning consistent with their meanings in the context of correlation technique should be interpreted as having, and
It will not be explained with idealization or excessively formal sense, unless clearly so limiting herein.
It should be noted that in the case where there is no conflict, the feature in embodiment and embodiment in the application can phase
Mutually combination.The application is described in detail below with reference to the accompanying drawings and in conjunction with the embodiments.
The feature of the application, principle and other aspects are described in detail below.
It may include that such as two panels has the lens of focal power according to the projection optics system of the application illustrative embodiments,
That is, the first lens and the second lens.This two panels lens is along optical axis by image source side extremely into image side sequential.
In the exemplary embodiment, the first lens can have positive light coke, can be convex surface closely into image side surface；Second thoroughly
Mirror can have negative power, and nearly image source side can be concave surface, can be convex surface closely into image side surface.First lens have positive light focus
Degree, the second lens have negative power, help to shorten the total length of projection optics system.The near of first lens be into image side surface
Convex surface is conducive to the susceptibility for reducing spherical aberration, reducing system tolerance.The nearly image source side of second lens is concave surface, closely into image side
Face is convex surface, is conducive to reduce projection optics system astigmatism, improves projection imaging quality.
In the exemplary embodiment, the projection optics system of the application can meet 0.5 ＜ CT1/CT2 ＜ 1 of conditional,
In, CT1 is the first lens in the center thickness on optical axis, and CT2 is the second lens in the center thickness on optical axis.More specifically,
CT1 and CT2 can further meet 0.55 ＜ CT1/CT2 ＜ 0.85, for example, 0.60≤CT1/CT2≤0.83.Reasonable distribution first
The center thickness of lens and the second lens can ensure that camera lens has shorter overall length.Further, the first lens and are passed through
The reasonable distribution and faying face type of the center thickness of two lens and the reasonable disposition of focal power so that the camera lens can be applied to infrared
Narrow-band, and can be applied to speckle projection system.
The wave-length coverage of the practical application wavelength X of the projection optics system of the application is had based on using the wave-length coverage of light source
There is the floating of ± 100nm.Specifically, the minimal wave length of the practical application wavelength X of projection optics system is than use light source
The short about 0nm-100nm of minimal wave length, the most long wavelength of practical application wavelength X are about 0nm- than using the most long wavelength of light source
100nm.The projection optics system of the application can be applied to arbitrary monochromatic source wave band, for example, the projection optics system of the application
It can be applied to infrared unicast long-wave band.Aberration, stray light introduced due to wide wavelength etc. is advantageously reduced using monochromatic source,
Be conducive to improve the image quality of projection optics system；Meanwhile it may be such that projection optics system meets diffractive-optical element (DOE)
The matched demand of fiber interface.
In the exemplary embodiment, the projection optics system of the application can meet conditional TAN (HFOV) ＜ 0.23,
In, HFOV is the maximum angle of half field-of view of projection optics system.More specifically, HFOV can further meet TAN (HFOV) ＜ 0.20,
For example, 0.16≤TAN (HFOV)≤0.18.Meet conditional TAN (HFOV) ＜ 0.23, be conducive to reduce the projected light beam angle of divergence
And increase the projection depth of field；The change for being conducive to depth of field face before and after projection side is flat；Algorithm process is also helped, it is more accurate so as to obtain
Depth information.
In the exemplary embodiment, the projection optics system of the application can meet 0.7 ＜ TR/Tr1r4 ＜ of conditional
1.3, wherein, TR is the image source face of projection optics system (for example, can be that infra-red laser diode (LD) or vertical-cavity surface-emitting swash
The light-emitting area of light device VCSEL) distance to the nearly image source side of the first lens on optical axis, Tr1r4 is the near of the first lens
Image source side to the second lens the nearly distance into image side surface on optical axis.More specifically, TR and Tr1r4 can further meet
0.76≤TR/Tr1r4≤1.20.Meet 0.7 ＜ TR/Tr1r4 ＜ 1.3 of conditional, it is ensured that the big field angle of camera lens has simultaneously
Beneficial to matching requirements are met, beneficial to assembling.
In the exemplary embodiment, the projection optics system of the application can meet conditional NA >=0.18, wherein, NA is
The object-side numerical aperture of projection optics system.More specifically, NA can further meet 0.18≤NA≤0.20.Meet conditional NA
>=0.18, projection optics system has larger numerical aperture, is conducive to increase the light source receiving ability of camera lens, improves projection energy
Amount efficiency, so as to obtain the projected image of more high brightness.
In the exemplary embodiment, the projection optics system of the application can meet 10 ° of conditional CRAmax ＜, wherein,
CRAmax is the maximum incident angle degree of the chief ray of projection optics system.More specifically, CRAmax can further meet 0 °≤
CRAmax≤9.51°.Meet 10 ° of conditional CRAmax ＜, be conducive to preferably match the outer radiant light cone angle of axis, increase optics
The outer light-inletting quantity of the axis of system improves the brightness of projected image.
In the exemplary embodiment, the projection optics system of the application can meet 0.6 ＜ DT11/DT21 ＜ 1 of conditional,
Wherein, DT11 is maximum half bore of the nearly image source side of the first lens, and DT21 is the maximum of the nearly image source side of the second lens
Half bore.More specifically, DT11 and DT21 can further meet 0.72≤DT11/DT21≤0.96.Meet 0.6 ＜ of conditional
DT11/DT21 ＜ 1, advantageously reducing image source influences the size of image side, improves projection performance.
In the exemplary embodiment, the projection optics system of the application can meet 0.5 ＜ SAG21/SAG22 ＜ of conditional
1, wherein, SAG21 has for the maximum of intersection point to the nearly image source side of the second lens of the nearly image source side and optical axis of the second lens
Imitate distance on the axis between half bore vertex, SAG22 is the near into the intersection point of image side surface and optical axis to the second lens of the second lens
The nearly effective half bore vertex of maximum into image side surface between axis on distance.More specifically, SAG21 and SAG22 further may be used
Meet 0.5 ＜ SAG21/SAG22 ＜ 0.9, for example, 0.53≤SAG21/SAG22≤0.84.Meet 0.5 ＜ SAG21/ of conditional
SAG22 ＜ 1 can effectively eliminate system spherical aberration, obtain high-definition image.
In the exemplary embodiment, the projection optics system of the application can meet conditional T12/ (CT1+CT2) ＜
0.5, wherein, T12 is the spacing distance of the first lens and the second lens on optical axis, and CT1 is the first lens on optical axis
Heart thickness, CT2 are the second lens in the center thickness on optical axis.More specifically, T12, CT1 and CT2 can further meet 0 ＜
T12/ (CT1+CT2) ＜ 0.4, for example, 0.10≤T12/ (CT1+CT2)≤0.34.Each lens thickness of reasonable distribution and spacing, have
Beneficial to the miniaturization for realizing projection optics system.
In the exemplary embodiment, the projection optics system of the application can meet 0.3 ＜ R3/R4 ＜ 0.8 of conditional,
In, R3 is the radius of curvature of the nearly image source side of the second lens, and R4 is the nearly radius of curvature into image side surface of the second lens.More
Body, R3 and R4 can further meet 0.4 ＜ R3/R4 ＜ 0.7, for example, 0.48≤R3/R4≤0.68.Reasonable Arrangement second is saturating
The nearly image source side of mirror and closely into the radius of curvature of image side surface, is conducive to the processing and manufacturing of the second lens；Meanwhile can to avoid due to
Radius of curvature it is too small and caused by tolerance sensitivities increase.
In the exemplary embodiment, the projection optics system of the application can meet -0.5 ＜ R2/f ＜ 0 of conditional,
In, R2 is the nearly radius of curvature into image side surface of the first lens, and f is total effective focal length of projection optics system.More specifically, R2
- 0.4 ＜ R2/f ＜ -0.2 can further be met with f, for example, -0.30≤R2/f≤- 0.23.Meet -0.5 ＜ R2/f of conditional
＜ 0 is conducive to reduce the astigmatism of projection optics system, improves projection imaging quality.
In the exemplary embodiment, above-mentioned projection optics system may also include at least one diaphragm, to promote camera lens
Image quality.Optionally, diaphragm may be provided at the second lens and between image side.
Speckle projection camera lens can be used as to be applied to depth finding field according to the projection optics system of the application.When using this
When the projection optics system of application carries out depth finding to the target object in space, by infra-red laser diode (LD) or vertical
The light that cavity surface emitting lasers (VCSEL) are sent can first pass through the amplification of projection optics system spot, using optical diffraction member
Part (DOE), and backward target object direction projects away.Projected light beam can be realized after diffractive-optical element (DOE)
Redistribution of the projected image on target object.Thereafter, target object is projected by any known pick-up lens capture
On image information, you can calculate the 3-D view with target object location depth information.According to the projection light of the application
System can be used in conjunction with each other with diffractive-optical element (DOE), so as to accurately realize projected light beam on target object
Redistribution.
It is at least one for aspherical mirror in the minute surface of each lens in presently filed embodiment.Non-spherical lens
The characteristics of be：From lens centre to lens perimeter, curvature is consecutive variations.It is constant with having from lens centre to lens perimeter
The spherical lens of curvature is different, and non-spherical lens has more preferably radius of curvature characteristic, and there is improvement to distort aberration and improve picture
The advantages of dissipating aberration.After non-spherical lens, the aberration occurred when imaging can be eliminated as much as possible, so as to improve
Image quality.
However, it will be understood by those of skill in the art that without departing from this application claims technical solution situation
Under, the lens numbers for forming projection lens can be changed, to obtain each result and the advantage described in this specification.Though for example,
It is so described in embodiments by taking two lens as an example, but the projection lens is not limited to include two lens.If
It needs, which may also include the lens of other quantity.
The specific embodiment for the projection optics system for being applicable to the above embodiment is further described with reference to the accompanying drawings.
Embodiment 1
Referring to Fig. 1 and Fig. 2 descriptions according to the projection optics system of the embodiment of the present application 1.Fig. 1 is shown according to this Shen
Please embodiment 1 projection optics system structure diagram.
As shown in Figure 1, according to the projection optics system of the application illustrative embodiments along optical axis by image source side to imaging
Side sequentially includes：First lens E1, the second lens E2 and diaphragm STO.
First lens E1 has positive light coke, and nearly image source side S1 is convex surface, is convex surface closely into image side surface S2.Second thoroughly
Mirror E2 has negative power, and nearly image source side S3 is concave surface, is convex surface closely into image side surface S4.Light from image source face OBJ according to
Sequence passes through each surface S1 to S4, after such as diffractive-optical element DOE (not shown), the target object that is projected in space
On.
For the practical application wavelength X of the projection lens of the present embodiment based on the wave-length coverage of light source is used to float, reality should
With the minimal wave length of wavelength X than using the minimal wave length of light source short about 0nm-100nm, the most long wavelength ratio of practical application wavelength X
0nm-100nm is about using the most long wavelength of light source.The projection lens of the present embodiment can be arbitrary monochromatic source using light source
Wave band, for example, infrared unicast long-wave band.
Table 1 show the surface types of each lens of the projection optics system of embodiment 1, radius of curvature, thickness, material and
Circular cone coefficient, wherein, the unit of radius of curvature and thickness is millimeter (mm).
Table 1
As shown in Table 1, the nearly image source side S1 of the first lens E1 and closely into image side surface S2 and the nearly picture of the second lens E2
Source face S3 and be aspherical closely into image side surface S4.In the present embodiment, the face type x of each non-spherical lens is available but unlimited
It is defined in following aspherical formula：
Wherein, x be it is aspherical along optical axis direction when being highly the position of h, away from aspheric vertex of surface apart from rise；C is
Aspherical paraxial curvature, c=1/R (that is, paraxial curvature c is the inverse of 1 mean curvature radius R of upper table)；K for circular cone coefficient (
It has been provided in table 1)；Ai is the correction factor of aspherical i-th-th ranks.The following table 2 is given available for each aspherical in embodiment 1
The high order term coefficient A of minute surface S1-S44、A6、A8、A10、A12、A14And A16。
| Face number | A4 | A6 | A8 | A10 | A12 | A14 | A16 |
| S1 | -1.1502E-01 | 1.3757E-01 | 1.0181E+00 | -6.6556E+00 | 1.7599E+01 | -2.2283E+01 | 1.0967E+01 |
| S2 | 5.1523E-02 | 4.5645E-01 | -1.0320E+00 | 1.7345E-01 | 2.6053E+00 | -4.5553E+00 | 2.7894E+00 |
| S3 | 3.3156E-01 | 6.6835E-01 | -2.8345E+00 | 6.2188E+00 | -9.0595E+00 | 8.1095E+00 | -2.0576E+00 |
| S4 | 2.2807E-02 | -9.5980E-03 | 2.2493E-02 | -1.1426E-01 | 1.7499E-01 | -1.1895E-01 | 3.2763E-02 |
Table 2
Table 3 provides total effective focal length f of projection optics system, the effective focal length f1 and f2 of each lens, projection in embodiment 1
The object-side numerical aperture NA of the optical system and maximum incident angle degree CRAmax of chief ray.
| Parameter | f(mm) | f1(mm) | f2(mm) | NA | CRAmax(°) |
| Numerical value | 2.79 | 1.56 | -12.76 | 0.20 | 0.00 |
Table 3
Projection optics system in embodiment 1 meets：
CT1/CT2=0.60, wherein, CT1 is the first lens E1 in the center thickness on optical axis, and CT2 is the second lens E2
In the center thickness on optical axis；
TR/Tr1r4=0.76, wherein, TR is the nearly image source side S1 of image source face OBJ to the first lens E1 on optical axis
Distance, Tr1r4 are distance on the nearly axis into image side surface S4 of the nearly image source side S1 to the second lens E2 of the first lens E1；
DT11/DT21=0.96, wherein, DT11 be the first lens E1 nearly image source side S1 maximum half bore, DT21
For maximum half bore of the nearly image source side S3 of the second lens E2；
SAG21/SAG22=0.84, wherein, the nearly image source side S3 and the intersection point of optical axis that SAG21 is the second lens E2 are extremely
Distance on axis between the effective half bore vertex of maximum of the nearly image source side S3 of second lens E2, SAG22 are the second lens E2
It is near into the intersection point of image side surface S4 and optical axis between the nearly effective half bore vertex of maximum into image side surface S4 of the second lens E2
Axis on distance；
T12/ (CT1+CT2)=0.12, wherein, T12 is the spacer of the first lens E1 and the second lens E2 on optical axis
It is the first lens E1 in the center thickness on optical axis from, CT1, CT2 is the second lens E2 in the center thickness on optical axis；
R3/R4=0.57, wherein, R3 is the radius of curvature of the nearly image source side S3 of the second lens E2, and R4 is the second lens
The nearly radius of curvature into image side surface S4 of E2；
R2/f=-0.30, wherein, R2 is the nearly radius of curvature into image side surface S2 of the first lens E1, and f is projection optics system
Total effective focal length of system.
Fig. 2 shows the distortion curve of the projection optics system of embodiment 1, represents that the distortion in the case of different visual angles is big
Small value.As can be seen from FIG. 2, the projection optics system given by embodiment 1 can realize good image quality.
Embodiment 2
Referring to Fig. 3 and Fig. 4 descriptions according to the projection optics system of the embodiment of the present application 2.In the present embodiment and following
In embodiment, for brevity, by clipped description similar to Example 1.Fig. 3 is shown according to the embodiment of the present application 2
Projection optics system structure diagram.
As shown in figure 3, according to the projection optics system of the application illustrative embodiments along optical axis by image source side to imaging
Side sequentially includes：First lens E1, the second lens E2 and diaphragm STO.
First lens E1 has positive light coke, and nearly image source side S1 is concave surface, is convex surface closely into image side surface S2.Second thoroughly
Mirror E2 has negative power, and nearly image source side S3 is concave surface, is convex surface closely into image side surface S4.Light from image source face OBJ according to
Sequence passes through each surface S1 to S4, after such as diffractive-optical element DOE (not shown), the target object that is projected in space
On.
For the practical application wavelength X of the projection lens of the present embodiment based on the wave-length coverage of light source is used to float, reality should
With the minimal wave length of wavelength X than using the minimal wave length of light source short about 0nm-100nm, the most long wavelength ratio of practical application wavelength X
0nm-100nm is about using the most long wavelength of light source.The projection lens of the present embodiment can be arbitrary monochromatic source using light source
Wave band, for example, infrared unicast long-wave band.
Table 4 show the surface types of each lens of the projection optics system of embodiment 2, radius of curvature, thickness, material and
Circular cone coefficient, wherein, the unit of radius of curvature and thickness is millimeter (mm).
Table 4
As shown in Table 4, in example 2, the nearly image source side S1 of the first lens E1 and closely into image side surface S2 and second
The nearly image source side S3 of lens E2 and be aspherical closely into image side surface S4.Table 5 is shown available for each aspherical in embodiment 2
The high order term coefficient of minute surface, wherein, each aspherical face type can be limited by the formula (1) provided in above-described embodiment 1.
| Face number | A4 | A6 | A8 | A10 | A12 | A14 | A16 |
| S1 | -4.7608E-01 | -1.4249E-01 | 1.9713E+00 | -4.9437E+00 | 1.2902E+01 | -1.9901E+01 | 1.1579E+01 |
| S2 | 4.2934E-02 | -8.5392E-02 | 8.0723E-01 | -2.2377E+00 | 5.6766E+00 | -6.5720E+00 | 2.8407E+00 |
| S3 | 2.8902E-02 | 4.1351E-01 | -6.2646E-01 | 2.1782E-01 | 2.6001E-01 | -2.2879E-01 | 5.0034E-02 |
| S4 | 7.9494E-02 | -1.1319E-02 | 2.2816E-02 | -1.1540E-01 | 1.3306E-01 | -6.7638E-02 | 1.3776E-02 |
Table 5
Table 6 provides total effective focal length f of projection optics system, the effective focal length f1 and f2 of each lens, projection in embodiment 2
The object-side numerical aperture NA of the optical system and maximum incident angle degree CRAmax of chief ray.
| Parameter | f(mm) | f1(mm) | f2(mm) | NA | CRAmax(°) |
| Numerical value | 2.97 | 1.94 | -15.32 | 0.20 | 0.00 |
Table 6
Fig. 4 shows the distortion curve of the projection optics system of embodiment 2, represents that the distortion in the case of different visual angles is big
Small value.As can be seen from FIG. 4, the projection optics system given by embodiment 2 can realize good image quality.
Embodiment 3
The projection optics system according to the embodiment of the present application 3 is described referring to Fig. 5 and Fig. 6.Fig. 5 is shown according to this
Apply for the structure diagram of the projection optics system of embodiment 3.
As shown in figure 5, according to the projection optics system of the application illustrative embodiments along optical axis by image source side to imaging
Side sequentially includes：First lens E1, the second lens E2 and diaphragm STO.
First lens E1 has positive light coke, and nearly image source side S1 is concave surface, is convex surface closely into image side surface S2.Second thoroughly
Mirror E2 has negative power, and nearly image source side S3 is concave surface, is convex surface closely into image side surface S4.Light from image source face OBJ according to
Sequence passes through each surface S1 to S4, after such as diffractive-optical element DOE (not shown), the target object that is projected in space
On.
For the practical application wavelength X of the projection lens of the present embodiment based on the wave-length coverage of light source is used to float, reality should
With the minimal wave length of wavelength X than using the minimal wave length of light source short about 0nm-100nm, the most long wavelength ratio of practical application wavelength X
0nm-100nm is about using the most long wavelength of light source.The projection lens of the present embodiment can be arbitrary monochromatic source using light source
Wave band, for example, infrared unicast long-wave band.
Table 7 show the surface types of each lens of the projection optics system of embodiment 3, radius of curvature, thickness, material and
Circular cone coefficient, wherein, the unit of radius of curvature and thickness is millimeter (mm).
Table 7
As shown in Table 7, in embodiment 3, the nearly image source side S1 of the first lens E1 and closely into image side surface S2 and second
The nearly image source side S3 of lens E2 and be aspherical closely into image side surface S4.Table 8 is shown available for each aspherical in embodiment 3
The high order term coefficient of minute surface, wherein, each aspherical face type can be limited by the formula (1) provided in above-described embodiment 1.
| Face number | A4 | A6 | A8 | A10 | A12 | A14 | A16 |
| S1 | -2.5098E-01 | 2.4397E-01 | -1.2270E+00 | 6.9646E+00 | -1.5365E+01 | 1.5031E+01 | -5.5169E+00 |
| S2 | 3.1574E-01 | -5.1571E-01 | 7.5735E-01 | 4.8387E-01 | -1.9047E+00 | 1.9615E+00 | -6.7456E-01 |
| S3 | 9.4578E-01 | -1.3546E+00 | 3.7131E+00 | -7.1166E+00 | 8.8522E+00 | -6.0079E+00 | 1.7729E+00 |
| S4 | 6.2268E-02 | -5.7158E-02 | 9.5985E-02 | -1.6408E-01 | 1.5495E-01 | -7.4764E-02 | 1.4416E-02 |
Table 8
Table 9 provides total effective focal length f of projection optics system, the effective focal length f1 and f2 of each lens, projection in embodiment 3
The object-side numerical aperture NA of the optical system and maximum incident angle degree CRAmax of chief ray.
| Parameter | f(mm) | f1(mm) | f2(mm) | NA | CRAmax(°) |
| Numerical value | 2.90 | 1.38 | -5.45 | 0.18 | 9.51 |
Table 9
Fig. 6 shows the distortion curve of the projection optics system of embodiment 3, represents that the distortion in the case of different visual angles is big
Small value.As can be seen from FIG. 6, the projection optics system given by embodiment 3 can realize good image quality.
Embodiment 4
The projection optics system according to the embodiment of the present application 4 is described referring to Fig. 7 and Fig. 8.Fig. 7 is shown according to this
Apply for the structure diagram of the projection optics system of embodiment 4.
As shown in fig. 7, according to the projection optics system of the application illustrative embodiments along optical axis by image source side to imaging
Side sequentially includes：First lens E1, the second lens E2 and diaphragm STO.
First lens E1 has positive light coke, and nearly image source side S1 is concave surface, is convex surface closely into image side surface S2.Second thoroughly
Mirror E2 has negative power, and nearly image source side S3 is concave surface, is convex surface closely into image side surface S4.Light from image source face OBJ according to
Sequence passes through each surface S1 to S4, after such as diffractive-optical element DOE (not shown), the target object that is projected in space
On.
For the practical application wavelength X of the projection lens of the present embodiment based on the wave-length coverage of light source is used to float, reality should
With the minimal wave length of wavelength X than using the minimal wave length of light source short about 0nm-100nm, the most long wavelength ratio of practical application wavelength X
0nm-100nm is about using the most long wavelength of light source.The projection lens of the present embodiment can be arbitrary monochromatic source using light source
Wave band, for example, infrared unicast long-wave band.
Table 10 shows surface type, radius of curvature, thickness, the material of each lens of the projection optics system of embodiment 4
And circular cone coefficient, wherein, the unit of radius of curvature and thickness is millimeter (mm).
Table 10
As shown in Table 10, in example 4, the nearly image source side S1 of the first lens E1 and closely into image side surface S2 and second
The nearly image source side S3 of lens E2 and be aspherical closely into image side surface S4.Table 11 is shown available for each aspheric in embodiment 4
The high order term coefficient of face minute surface, wherein, each aspherical face type can be limited by the formula (1) provided in above-described embodiment 1.
| Face number | A4 | A6 | A8 | A10 | A12 | A14 | A16 |
| S1 | -2.1138E-01 | -1.1885E-01 | -2.4495E-01 | 9.9349E-01 | -2.0730E-01 | -2.1751E+00 | 1.8881E+00 |
| S2 | 3.3318E-01 | -7.0304E-01 | 1.0383E+00 | -2.5415E-01 | -1.7032E+00 | 2.9514E+00 | -1.4844E+00 |
| S3 | 9.9918E-01 | -1.5561E+00 | 4.2884E+00 | -8.0178E+00 | 9.7811E+00 | -6.4954E+00 | 1.8045E+00 |
| S4 | 6.5903E-02 | -6.1438E-02 | 8.6636E-02 | -1.2363E-01 | 1.0021E-01 | -3.8877E-02 | 5.2154E-03 |
Table 11
Table 12 provides total effective focal length f of projection optics system, the effective focal length f1 and f2 of each lens, throwing in embodiment 4
Penetrate the object-side numerical aperture NA of the optical system and maximum incident angle degree CRAmax of chief ray.
| Parameter | f(mm) | f1(mm) | f2(mm) | NA | CRAmax(°) |
| Numerical value | 3.02 | 1.25 | -3.93 | 0.18 | 9.36 |
Table 12
Fig. 8 shows the distortion curve of the projection optics system of embodiment 4, represents that the distortion in the case of different visual angles is big
Small value.As can be seen from FIG. 8, the projection optics system given by embodiment 4 can realize good image quality.
To sum up, embodiment 1 to embodiment 4 meets the relation shown in table 13 respectively.
| Conditional embodiment | 1 | 2 | 3 | 4 |
| CT1/CT2 | 0.60 | 0.75 | 0.83 | 0.76 |
| TAN(HFOV) | 0.18 | 0.17 | 0.17 | 0.16 |
| TR/Tr1r4 | 0.76 | 1.20 | 0.86 | 1.00 |
| NA | 0.20 | 0.20 | 0.18 | 0.18 |
| CRAmax(°) | 0.00 | 0.00 | 9.51 | 9.36 |
| DT11/DT21 | 0.96 | 0.72 | 0.80 | 0.79 |
| SAG21/SAG22 | 0.84 | 0.53 | 0.62 | 0.69 |
| T12/(CT1+CT2) | 0.12 | 0.34 | 0.14 | 0.10 |
| R3/R4 | 0.57 | 0.68 | 0.52 | 0.48 |
| R2/f | -0.30 | -0.24 | -0.23 | -0.23 |
Table 13
The preferred embodiment and the explanation to institute's application technology principle that above description is only the application.People in the art
Member should be appreciated that invention scope involved in the application, however it is not limited to the technology that the particular combination of above-mentioned technical characteristic forms
Scheme, while should also cover in the case where not departing from the inventive concept, it is carried out by above-mentioned technical characteristic or its equivalent feature
The other technical solutions for being combined and being formed.Such as features described above has similar work(with (but not limited to) disclosed herein
The technical solution that the technical characteristic of energy is replaced mutually and formed.
Claims (12)
1. projection optics system is extremely sequentially included along optical axis by image source side into image side：First lens and the second lens, feature
It is,
First lens have positive light coke, are convex surface closely into image side surface；
Second lens have negative power, and nearly image source side is concave surface, are convex surface closely into image side surface；
First lens are in the center thickness CT1 on the optical axis and second lens in the center thickness on the optical axis
CT2 meets 0.5 ＜ CT1/CT2 ＜ 1.
2. projection optics system according to claim 1, which is characterized in that the image source face of the projection optics system to institute
The nearly image source sides of distance TR of the nearly image source side of the first lens on the optical axis and first lens is stated to described the
The nearly distance Tr1r4 into image side surface on the optical axis of two lens meets 0.7 ＜ TR/Tr1r4 ＜ 1.3.
3. projection optics system according to claim 2, which is characterized in that first lens and second lens exist
Spacing distance T12, first lens on the optical axis is in the center thickness CT1 on the optical axis and second lens
Meet T12/ (CT1+CT2) ＜ 0.5 in the center thickness CT2 on the optical axis.
4. projection optics system according to claim 1, which is characterized in that the nearly image source side of first lens is most
More than half bore DT11 and maximum half bore DT21 of the nearly image source side of second lens meet 0.6 ＜ DT11/DT21 ＜ 1.
5. projection optics system according to claim 1, which is characterized in that the song of the nearly image source side of second lens
Rate radius R3 and the nearly radius of curvature R 4 into image side surface of second lens meet 0.3 ＜ R3/R4 ＜ 0.8.
6. projection optics system according to claim 5, which is characterized in that the nearly image source side of second lens and institute
State distance SAG21 on intersection point to the axis between the effective half bore vertex of maximum of the nearly image source side of second lens of optical axis
Have with the nearly nearly maximum into image side surface into the intersection point of image side surface and the optical axis to second lens of second lens
It imitates distance SAG22 on the axis between half bore vertex and meets 0.5 ＜ SAG21/SAG22 ＜ 1.
7. projection optics system according to claim 1, which is characterized in that the nearly song into image side surface of first lens
Rate radius R2 and total effective focal length f of the projection optics system meet -0.5 ＜ R2/f ＜ 0.
8. projection optics system according to any one of claim 1 to 7, which is characterized in that the projection optics system
Practical application wavelength X minimal wave length than using the minimal wave length of light source short 0nm-100nm, the reality of the projection optics system
Border is using the most long wavelength of wavelength X than using the most long wavelength of light source long 0nm-100nm.
9. projection optics system according to any one of claim 1 to 7, which is characterized in that the projection optics system
Maximum angle of half field-of view HFOV meet TAN (HFOV) ＜ 0.23.
10. projection optics system according to any one of claim 1 to 7, which is characterized in that the projection optics system
Object-side numerical aperture NA meet NA >=0.18.
11. projection optics system according to any one of claim 1 to 7, which is characterized in that the projection optics system
The maximum incident angle degree CRAmax of chief ray meet 10 ° of CRAmax ＜.
12. projection optics system is extremely sequentially included along optical axis by image source side into image side：First lens and the second lens, it is special
Sign is,
First lens have positive light coke, are convex surface closely into image side surface；
Second lens have negative power, and nearly image source side is concave surface, are convex surface closely into image side surface；
Spacing distance T12 on the optical axis of first lens and second lens, first lens are in the light
Center thickness CT1 and second lens on axis meet T12/ (CT1+CT2) ＜ in the center thickness CT2 on the optical axis
0.5。
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