CN103018886A - Virtual image projection objective and ultrawide-angle objective - Google Patents
Virtual image projection objective and ultrawide-angle objective Download PDFInfo
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- CN103018886A CN103018886A CN2012105749296A CN201210574929A CN103018886A CN 103018886 A CN103018886 A CN 103018886A CN 2012105749296 A CN2012105749296 A CN 2012105749296A CN 201210574929 A CN201210574929 A CN 201210574929A CN 103018886 A CN103018886 A CN 103018886A
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Abstract
The invention discloses a virtual image projection objective which comprises first, second and third lenses arranged in sequence. First focal power phi1 of the first lens, second focal power phi2 of the second lens, third focal power phi3 of the third lens and total focal power of the virtual image projection objective are related in such way: -6<=phi1<=-4, -7<=phi2/phi<=-5, and -29<=phi3/phi<=-24. The invention further provides an ultrawide-angle objective. The ultrawide-angle objective mainly and structurally comprises the virtual image projection objective. An entry pupil of the virtual image projection objective is provided with diaphragm spherical aberration. Experimental results obtained according to the technical scheme show that the first, second and third lenses in the virtual image projection objective and the ultrawide-angle objective can acquire ultrawide field angle at 170 DEG and meet the requirement of an ultrawide-angle optical system for imaging simulation in a virtual test system.
Description
Technical field
The present invention relates to the shadow casting technique field, particularly a kind of for virtual image projection objective and a kind of super wide-angle lens.
Background technology
Traditional real image projection objective, can be with illuminated image source, such as LCD(Liquid CrystalDisplay, liquid crystal display), LCoS(Liquid Crystal on Silicon, be liquid crystal on silicon) or film etc., projection imaging is to concrete receiving screen, such as smooth metope, curtain, rear projection television screen etc.Real image projection objective imaging is to be formed by real convergence of rays.Human eye or camera carry out again imaging to the real image that the real image projection objective becomes, thereby obtain image information.Therefore, produce image from image source and become altogether the secondary real image to image by the whole process of human eye or camera reception, for the first time imaging needs screen as referral.
And virtual image projection objective is that the image projection that illuminated image source produces is arrived virtual image space, imaging is not to be formed by real convergence of rays, but emergent ray reverse extending line is assembled the virtual image that characterizes, it or not necessary being, therefore the virtual image that becomes can't receive with concrete screen, but can adopt virtual image projection objective and human eye or camera to carry out the mode of diaphragm coupling, and the virtual image that virtual image projection objective is become converts real image to, received by human eye or camera, obtain image information.Producing image from image source is received by human eye or camera to image, whole process only becomes real image one time, do not need screen that referral is carried out in the virtual image in the imaging process, therefore need not larger projector space and place screen, projection system architecture is small and exquisite, be fit to than large scene, particularly the simulation of super wide-angle scene shows.
Virtual image optical projection system can be used for making up virtual test environment, satisfies the user demand of optical system to be tested.For super wide-angle optics, if adopt the real image projection objective system, because its visual field size on projection plane meets the field angle tangent relationship with operating distance, in order to satisfy the requirement of larger operating distance, the projected area that must have super large, take ± 80 ° of field angle as example, operating distance for satisfied 2 meters, then need diagonal line to be about 11.4 meters projection screen, and for larger operating distance requirement, projection screen also need become the increase of multiplying power, therefore, adopt the real image projection objective system larger for the test difficulty of super wide-angle optics, and virtual image projection objective does not need projection screen to do the secondary imaging referral, is more suitable for super wide-angle optics for the various requirement of virtual testing environment.
In the prior art, the super wide field angle maximum of virtual image projection objective can reach 120 °, still, still is difficult to reach some super wide-angle optics to the requirements at the higher level of the super wide field angle of virtual image projection objective in the virtual testing environment.
Therefore, in virtual testing environment, how making virtual image projection objective obtain larger super wide field angle, to satisfy the Imaging Simulation needs of super wide-angle optics, is the technical matters that those skilled in the art need to be resolved hurrily.
Summary of the invention
In view of this, the invention provides a kind of virtual image projection objective and a kind of super wide-angle lens, have the super Wide-angle up to 170 °, satisfy the Imaging Simulation needs of super wide-angle optics.
For achieving the above object, the invention provides following technical scheme:
A kind of virtual image projection objective comprises the first lens, the second lens and the 3rd lens that are arranged in order, wherein, and the first focal power Φ of described first lens
1, described the second lens the second focal power Φ
2, described the 3rd lens the 3rd focal power Φ
3And there is following relational expression between total focal power Φ of described virtual image projection objective:
-6≤Φ
1/Φ≤-4；
-7≤Φ
2/Φ≤-5；
-29≤Φ
3/Φ≤-24。
Preferably, in above-mentioned virtual image projection objective, the first surface of described the second lens is aspheric surface, and described first surface is relative with described the 3rd lens.
Preferably, in above-mentioned virtual image projection objective, also comprise the 4th lens, the 5th lens and the 6th lens that are arranged in order, wherein, described first lens and described the second lens are positioned at a side of described the 3rd lens, described the 4th lens, described the 5th lens and described the 6th lens are positioned at the opposite side of described the 3rd lens, and the 4th focal power Φ of described the 4th lens
4, described the 5th lens the 5th focal power Φ
5, described the 6th lens the 6th focal power Φ
6And there is following relational expression between described total focal power Φ:
-5≤Φ
4/Φ≤-3；
9≤Φ
5/Φ≤11；
-6≤Φ
6/Φ≤-3。
Preferably, in above-mentioned virtual image projection objective, the second surface of described the 4th lens is aspheric surface, and described second surface is relative with described the 3rd lens.
Preferably, in above-mentioned virtual image projection objective, described virtual image projection objective exists virtual aperture diaphragm and field stop.
Preferably, in above-mentioned virtual image projection objective, real image face in the middle of described middle real image face exists between described the 3rd lens and described the 4th lens.
A kind of super wide-angle lens comprises above-mentioned virtual image projection objective, and wherein, there is Stop spherical aberration in the entrance pupil of described virtual image projection objective.
Preferably, in above-mentioned super wide-angle lens, the entrance pupil diameter of described virtual image projection objective is greater than the exit pupil diameter of described super wide-angle lens.
Preferably, in above-mentioned super wide-angle lens, described virtual image projection objective becomes the position of the virtual image by the optimal imaging object distance decision of described super wide-angle lens.
Can find out according to the concrete experimental result that technique scheme draws, it is 170 ° super Wide-angle that the virtual image projection objective that the embodiment of the invention provides and the first lens in the super wide-angle lens, the second lens and the 3rd lens can obtain field of view angle, in virtual testing environment, satisfy the Imaging Simulation needs of super wide-angle optics.
Description of drawings
In order to be illustrated more clearly in the embodiment of the invention or technical scheme of the prior art, the below will do to introduce simply to the accompanying drawing of required use in embodiment or the description of the Prior Art, apparently, accompanying drawing in the following describes only is some embodiments of the present invention, for those of ordinary skills, under the prerequisite of not paying creative work, can also obtain according to these accompanying drawings other accompanying drawing.
The structural representation of the optical system of the virtual image projection objective that Fig. 1 provides for the embodiment of the invention;
The ray tracing schematic diagram of the optical system of the virtual image projection objective that Fig. 2 provides for the embodiment of the invention;
The field curvature curve of the virtual image projection objective that Fig. 3 provides for the embodiment of the invention;
The distortion curve of the virtual image projection objective that Fig. 4 provides for the embodiment of the invention;
The MTF curve of the virtual image projection objective that Fig. 5 provides for the embodiment of the invention;
Fig. 6 distributes for the Stop spherical aberration of the virtual image projection objective that the embodiment of the invention provides;
The Stop spherical aberration of the virtual image projection objective that Fig. 7 provides for the embodiment of the invention is with the visual field change curve.
Embodiment
The invention discloses a kind of virtual image projection objective and super wide-angle lens, have the super Wide-angle up to 170 °, satisfy the Imaging Simulation needs of super wide-angle optics.
Below in conjunction with the accompanying drawing in the embodiment of the invention, the technical scheme in the embodiment of the invention is clearly and completely described, obviously, described embodiment only is the present invention's part embodiment, rather than whole embodiment.Based on the embodiment among the present invention, those of ordinary skills belong to the scope of protection of the invention not making the every other embodiment that obtains under the creative work prerequisite.
See also Fig. 1-Fig. 7, the structural representation of the optical system of the virtual image projection objective that Fig. 1 provides for the embodiment of the invention, the ray tracing schematic diagram of the optical system of the virtual image projection objective that Fig. 2 provides for the embodiment of the invention, the field curvature curve of the virtual image projection objective that Fig. 3 provides for the embodiment of the invention, the distortion curve of the virtual image projection objective that Fig. 4 provides for the embodiment of the invention, the MTF(Modulation ofTransfer Function of the virtual image projection objective that Fig. 5 provides for the embodiment of the invention, modulation transfer function) curve, the Stop spherical aberration of the virtual image projection objective that Fig. 6 provides for the embodiment of the invention distributes, and the Stop spherical aberration of the virtual image projection objective that Fig. 7 provides for the embodiment of the invention is with the visual field change curve.
The virtual image projection objective that the embodiment of the invention provides comprises the first lens 1, the second lens 2 and the 3rd lens 3 that are arranged in order, wherein, and the first focal power Φ of first lens 1
1, the second lens 2 the second focal power Φ
2, the 3rd lens 3 the 3rd focal power Φ
3And there is following relational expression :-6≤Φ between total focal power Φ of virtual image projection objective
1/ Φ≤-4 ,-7≤Φ
2/ Φ≤-5 ,-29≤Φ
3Φ≤-24.
Please refer to the structural representation of the optical system of virtual image projection objective shown in Figure 1, in the present embodiment, also comprise the 4th lens 4, the 5th lens 5 and the 6th lens 6 that are arranged in order, wherein, first lens 1 and the second lens 2 are positioned at a side of the 3rd lens 3, the 4th lens 4, the 5th lens 5 and the 6th lens 6 are positioned at the opposite side of the 3rd lens 3, and the 4th focal power Φ of the 4th lens 4
4, the 5th lens 5 the 5th focal power Φ
5, the 6th lens 6 the 6th focal power Φ
6And there is following relational expression :-5≤Φ between total focal power Φ
4/ Φ≤-3,9≤Φ
5/ Φ≤11 ,-6≤Φ
6/ Φ≤-3.
In order further to optimize technique scheme, in the present embodiment, the first surface 21 of the second lens 2 and the second surface 41 of the 4th lens 4 are aspheric surface, wherein, above-mentioned first surface 21 is side relative with the 3rd lens 3 on the second lens 2, and above-mentioned second surface 41 is side relative with the 3rd lens 3 on the 4th lens 4.
Please refer to the ray tracing schematic diagram of the optical system of virtual image projection objective shown in Figure 2, can find out, the first lens 1 of virtual image projection objective of the present invention, the second lens 2 and the 3rd lens 3 form for the first time imaging group, realize that the virtual image of 170 ° super Wide-angle converts to and the real image of optical axis included angle less than 30 °.The 4th lens 4 of virtual image projection objective of the present invention, the 5th lens 5 and the 6th lens L6 form for the second time imaging group, the image quality of imaging first time group are optimized, to satisfy virtual image projection requirement.
In the present embodiment, virtual image projection objective does not comprise real aperture diaphragm and field stop, but has virtual aperture diaphragm and field stop.And real image face in the middle of existing, this centre real image face be between the 3rd lens 3 and the 4th lens 4, i.e. virtual field stop position.
The present invention also provides a kind of super wide-angle lens, and the primary structure of this super wide-angle lens comprises above-mentioned virtual image projection objective in forming, and wherein, there is Stop spherical aberration in the entrance pupil of virtual image projection objective, and the structure of Stop spherical aberration is consistent with the Stop spherical aberration of super wide-angle lens; Simultaneously, the entrance pupil diameter of virtual image projection objective is greater than the exit pupil diameter of super wide-angle lens; In addition, virtual image projection objective becomes the position of the virtual image by the optimal imaging object distance decision of super wide-angle lens.
In the specific embodiment provided by the invention:
Focal distance f=-10mm, work F counts F#=5,
Full visual field FOV (Field ofView, i.e. visual field)=170 °,
Operating distance L1=3mm, the virtual projection distance L=-600mm.
The basic optical structural parameters of specific embodiment provided by the invention are as shown in the table, the radius-of-curvature, quadric surface coefficient and the center thickness that have wherein comprised each lens of specific embodiment, each lens uses refractive index and the Abbe coefficient of material, and the airspace data between each lens, complete statement the optical texture of specific embodiment provided by the invention.
The concrete experimental result that technique scheme draws sees also Fig. 3-Fig. 7, the field curvature curve of the virtual image projection objective that Fig. 3 provides for the embodiment of the invention, the distortion curve of the virtual image projection objective that Fig. 4 provides for the embodiment of the invention, the MTF(Modulationof Transfer Function of the virtual image projection objective that Fig. 5 provides for the embodiment of the invention, modulation transfer function) curve, the Stop spherical aberration of the virtual image projection objective that Fig. 6 provides for the embodiment of the invention distributes, and the Stop spherical aberration of the virtual image projection objective that Fig. 7 provides for the embodiment of the invention is with the visual field change curve.
Among Fig. 3, the curvature of field refers to curvature of the image, is optimal imaging face and desirable as the deviation between the plane, and the transverse axis coordinate represents distance among the figure, and the Y-axis coordinate represents the visual field, and curve represents the corresponding best image planes in each visual field and desirable deviation as the plane among the figure.
Among Fig. 4, distortion is the deviation of actual imaging position relative ideal image space, and the transverse axis coordinate represents relative amount of distortion among the figure, and the Y-axis coordinate represents the visual field, and curve represents the deviation of corresponding optimal imaging position, each visual field and ideal image position among the figure.
Among Fig. 5, MTF is a kind of comprehensive evaluation index of optical system.It regards optical system as a spatial frequency filtering device, and MTF represents by thing process camera lens to the degree of modulation transmission of picture and the relation of spatial frequency.As a composite target, aberration, diffraction, assembling and calibration error and other impacts that image quality is caused such as factors such as environment temperatures can be embodied in the MTF of system.The MTF numerical value of each visual field from the mtf value of diffraction limit more close to, the image quality of expression system is better.The transverse axis coordinate represents spatial frequency among the figure, and ordinate of orthogonal axes represents degree of modulation, and curve represents each visual field corresponding degree of modulation under different space frequency among the figure.
Among Fig. 6, the super wide-angle optics of Stop spherical aberration is difficult to avoid, namely for extra-axial object point, corresponding with the vertical aperture diaphragm of optical axis the entrance pupil with respect to inclined light shaft, vergence direction is to trend towards including in more object space imaging beam (so just can well explain that some surpass 90 ° of angle of half field-of view imaging of optical systems problems).Therefore, the outer field angle of the axle of super wide-angle optics, corresponding two inclination entrance pupil planes about symmetrical, the position of entrance pupil increases with field angle and entrance pupil position on the off-axis, and difference also appears in the outer entrance pupil shape of axle, and these are different from the ordinary optical system.When field angle hour, be that paraxial entrance pupil position can also be similar to and regards entrance pupil position on the axle as, increase gradually and work as field angle, actual entrance pupil is by paraxial entrance pupil move right (the coordinate design of propagating from left to right according to light), amount of movement determines by Stop spherical aberration, and the shape of the outer entrance pupil of axle is affected by Stop spherical aberration also and becomes approximate ellipsoidal.The chief ray of the parallel rays of each visual field and optical axes crosspoint are mobile from left to right with the field angle increase among the figure, namely characterize Stop spherical aberration.
Can find out according to the concrete experimental result that technique scheme draws, it is 170 ° super Wide-angle that the virtual image projection objective that the embodiment of the invention provides and the first lens in the super wide-angle lens, the second lens and the 3rd lens can obtain field of view angle, in virtual testing environment, satisfy the Imaging Simulation needs of super wide-angle optics.
To the above-mentioned explanation of the disclosed embodiments, make this area professional and technical personnel can realize or use the present invention.Multiple modification to these embodiment will be apparent concerning those skilled in the art, and General Principle as defined herein can be in the situation that do not break away from the spirit or scope of the present invention, in other embodiments realization.Therefore, the present invention will can not be restricted to these embodiment shown in this article, but will meet the widest scope consistent with principle disclosed herein and features of novelty.
Claims (9)
1. a virtual image projection objective is characterized in that, comprises the first lens (1), the second lens (2) and the 3rd lens (3) that are arranged in order, wherein, and the first focal power Φ of described first lens (1)
1, described the second lens (2) the second focal power Φ
2, described the 3rd lens (3) the 3rd focal power Φ
3And there is following relational expression between total focal power Φ of described virtual image projection objective:
-6≤Φ
1/Φ≤-4；
-7≤Φ
2/Φ≤-5；
-29≤Φ
3/Φ≤-24。
2. virtual image projection objective according to claim 1 is characterized in that, the first surface (21) of described the second lens (2) is aspheric surface, and described first surface (21) is relative with described the 3rd lens (3).
3. virtual image projection objective according to claim 1, it is characterized in that, also comprise the 4th lens (4), the 5th lens (5) and the 6th lens (6) that are arranged in order, wherein, described first lens (1) and described the second lens (2) are positioned at a side of described the 3rd lens (3), described the 4th lens (4), described the 5th lens (5) and described the 6th lens (6) are positioned at the opposite side of described the 3rd lens (3), and the 4th focal power Φ of described the 4th lens (4)
4, described the 5th lens (5) the 5th focal power Φ
5, described the 6th lens (6) the 6th focal power Φ
6And there is following relational expression between described total focal power Φ:
-5≤Φ
4/Φ≤-3；
9≤Φ
5/Φ≤11；
-6≤Φ
6/Φ≤-3。
4. virtual image projection objective according to claim 3 is characterized in that, the second surface (41) of described the 4th lens (4) is aspheric surface, and described second surface (41) is relative with described the 3rd lens (3).
5. virtual image projection objective according to claim 1 is characterized in that, described virtual image projection objective exists virtual aperture diaphragm and field stop.
6. virtual image projection objective according to claim 1 is characterized in that, real image face in the middle of existing between described the 3rd lens (3) and described the 4th lens (4).
7. a super wide-angle lens is characterized in that, comprises each described virtual image projection objective of claim 1-6, and wherein, there is Stop spherical aberration in the entrance pupil of described virtual image projection objective.
8. super wide-angle lens according to claim 7 is characterized in that, the entrance pupil diameter of described virtual image projection objective is greater than the exit pupil diameter of described super wide-angle lens.
9. super wide-angle lens according to claim 7 is characterized in that, described virtual image projection objective becomes the position of the virtual image by the optimal imaging object distance decision of described super wide-angle lens.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN108254882A (en) * | 2018-02-06 | 2018-07-06 | 中国科学院西安光学精密机械研究所 | Ultra-large vision field pin hole optical imaging system |
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| JP2001194583A (en) * | 2000-01-13 | 2001-07-19 | Sony Corp | Projection lens and video projecting device |
| CN200986619Y (en) * | 2006-06-12 | 2007-12-05 | 王小光 | Close range large view angle image-forming device |
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Application publication date: 20130403 |