CN102213906B - Optical engine of infrared digital light processing (DLP) telecentric projection system - Google Patents
Optical engine of infrared digital light processing (DLP) telecentric projection system Download PDFInfo
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- CN102213906B CN102213906B CN 201110117425 CN201110117425A CN102213906B CN 102213906 B CN102213906 B CN 102213906B CN 201110117425 CN201110117425 CN 201110117425 CN 201110117425 A CN201110117425 A CN 201110117425A CN 102213906 B CN102213906 B CN 102213906B
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Abstract
The invention discloses an optical engine of an infrared digital light processing (DLP) telecentric projection system. The optical engine is mainly used for the research on an infrared scene simulator. The invention provides a telecentric light path structure without a total-internal-reflectance (TIR) prism; and the optical structure comprises an infrared light source, an ellipsoidal reflecting bowl, a hollow square bar, a group of illumination relaying lenses, a digital mirror device (DMD) chip, a plane reflector and a group of projection objective lenses. By the system, the design of a telecentric DLP projection light path with an infrared waveband is realized. The optical engine has the characteristics of applicability to infrared wavebands, telecentric projection, simple manufacturing, high reliability, convenience of optimization and relatively low cost.
Description
Technical field:
The present invention relates to a kind of optical system, special, relate to the infrared optical system that a kind of digital light is processed (DLP), this system is used for Infrared Scene emulation field.
Background technology:
The infrared dynamic scene emulation technology is take new and high technologies such as computing machine, information processing, microelectronics as support, a large amount of infrared simulation tests and limited field trial are combined, not only can optimization system design, improve system performance, and can in time diagnose and get rid of hidden danger and fault, can effectively improve development quality; In addition, can also greatly reduce the outfield experiments number of times by using emulation technology, thereby play the purpose of shortening lead time, saving research fund, raising system performance.
The Infrared Image Simulation device comprises infrared target and background generation systems and optical system, function is the infrared image that the digital picture that computing machine generates is converted to corresponding spectral coverage, and project the entrance pupil place of infrared imaging system and be full of entrance pupil, so that the in the same size of infrared scene and real goal and the background image patch on detector, the space distribution of emittance is consistent.Require the only time space of its projection incoherent, unpolarized.
In the modern shadow casting technique, TFT-LCD, LCOS and DLP are the advanced projection display techniques of comparison main flow.LCD and LCOS all are not suitable for infrared band, and DLP is owing to being the reflected light modulation, with the projected light Wavelength-independent, so go for infrared band.Compare the active illuminating shadow casting techniques such as resistance bridge, the optical system of using DLP shadow casting technique to finish the Infrared Image Simulation device has the characteristics such as high resolving power, high frame frequency, the dead pixel of nothing and good uniformity.
In the DLP shadow casting technique, optical system is used the digital micromirror device (DMD) of Texas Instrument Co company research and development.DMD is a kind of microelectromechanical systems (Micro Electromechanical System, MEMS), also is a kind of semiconductor spatial light modulator (SLM).DMD is called MEMS to be formed because it is built in by thousands of turnover tiny mirror (micro mirror of different model DMD varies in size) above the hinge arrangement of static RAM (SRAM) top.On the other hand, because these micro-reflectors are to come light modulated in the mode of at a high speed reflection, be a kind of reflective SLM so DMD may also be referred to as.The micro-reflector of DMD has three kinds of states, is respectively open and close, level state.The specific works principle is exactly, and to DMD, and circuit is controlled the state of every a slice DMD to the illumination light of incident with certain angular illumination.If "On" state, the illumination incident light will enter follow-up projection optical system by the DMD reflection, if "Off" state, the illumination incident light does not enter optical projection system.Like this, in an integration period of detector, control DMD is in the time of " opening " "Off" state, has just controlled the luminous energy that enters optical projection system.So by the different dmd array of these reflected energies of control, just can produce the gray level image that also projection needs.
The residing whole optical system of DLP comprises the illumination optical system projection optical system of unifying, and the former is nonimaging optics, and the latter is image optics.In the DLP optical projection system, the quality of illumination is most important for the performance impact of whole system.
The DLP light path reference " Single-Panel DLPTM Projection System Optics " that provides in official of Texas Instrument Co company has provided two kinds of typical single-chip formula DLP projection optical system frameworks: core structure far away and non-core structure far away.
The optical system of core structure far away, the illumination section system adopts telecentric beam path in image space, and it all is parallel making the chief ray that shines on the DMD plane.Because core structure far away, the emergent pupil of illuminator and the entrance pupil of optical projection system be all in the infinite distance, so this structural design is got up than being easier to, optical projection system and illuminator can be divided the simultaneously design of coming.Generally speaking, in this structure, optical projection system and illuminator separate with a TIR (total-internal-reflectance) prism, so projection section and illumination section do not have parameter influence mutually.Under this framework, DMD need not biasing, and illumination uniformity also can be accomplished fine.
Non-telecentric beam path, be exactly illumination path be non-telecentric beam path, the upper reception of DMD is not the irradiation of parallel light cone.Owing to be not telecentric beam path, consider efficiency of light energy utilization problem, design should be with the entrance pupil of the emergent pupil of illuminator and optical projection system to being complementary.So non-telecentric system, illumination and optical projection system can not separately design.Non-telecentric beam path is compared telecentric beam path, because illuminating bundle is not parallel, generally comes separately illuminator and optical projection system without the TIR prism.Adopt the DMD biasing, and large illumination incident angle, even complicated free-form surface mirror could separate enough angles with illuminator and optical projection system.Its advantage is that the illumination incident angle is larger, and the contrast of DLP drop shadow effect is higher, and structure can design compactly, is fit to Miniaturization Design.But because the illuminating bundle of non-telecentric beam path is not parallel, so the even angle of its illuminating bundle is not so good as core structure far away.
Core structure far away is simple, but the TIR prism is to minute light action of light beam, even in theory, also only have at most 25% energy to throw away, and TIR prism cementing material is larger for infrared absorption, causes the energy loss of this structure too large, is not suitable for infrared optical system.But not heart framework far away, maximum problem is that the Design and manufacture cost is larger, may also need to use the free form surface reflecting surface and come separately illuminator and optical projection system.The design comparison of free form surface is complicated, and research and development and processing cost are very large.
Summary of the invention:
What the present invention mainly finished is to propose a kind of infrared DLP optical system, overcomes restriction and the shortcoming of core structure far away and non-core structure far away, makes it to have and makes simply, and reliability is high, the characteristics that cost is relatively cheap.The present invention is applied to the manufacturing of Infrared Scene emulator.
The present invention proposes a kind of infrared DLP projecting light path of telecentric light.Heart projection structure far away has illumination uniformity high, the projection accuracy high.Telecentric system of the present invention does not need to use the TIR prism, and it is very favorable improving for the infrared system capacity usage ratio.Simultaneously do not need the dmd chip of setovering yet, thereby can erect easily light path.The design of illuminator, what mainly consider is illumination uniformity and capacity usage ratio.Utilize structure of the present invention, can obtain uniform illuminating effect and higher capacity usage ratio.
DLP light engine of the present invention, fully applicable infrared band.Infrared optical system, lens materials is expensive, and the present invention is simple in structure, and size is less, is conducive to control the manufacturing cost of Infrared Scene Generator.Among the present invention, illuminator and optical projection system all can adopt more common infrared optical material preparation.It must be noted that the spectral transmission problem of the optical window of DMD micro mirror array.Common dmd array is packaged, on the optical window material can not see through infrared light, in order to be applicable to infrared band, therefore must use the DMD that changed the optical window material in the present invention.
The present invention is achieved by the following technical solutions, specifically comprises: infrared light supply, spheroid shape reflector, hollow square rod, illumination relay lens, dmd chip, plane mirror, projection objective.Infrared light supply can be selected blackbody radiation source or Elema, and infrared light supply places on the focus of ellipse reflector, and its light beam converges on another focus of spheroid shape reflector.Place hollow square rod entrance in another focus that converges.Hollow square rod inside will plate the reflectance coating of infrared medium-wave band reflectivity more than 90%.After light enters square rod, in square rod, behind the Multi reflection, play the effect of a light integrators, obtain uniform light distribution in the square rod exit.Behind hollow square rod, place the illumination relay lens group.These group lens are a kind of critical illumination designs, make the equally distributed light intensity in square rod exit be imaged onto DMD micro mirror array place.Because the heart framework far away that adopts is so this lens combination emergent pupil should be at infinity.The illuminating lens group there is no high requirement to aberration, eliminates spherical aberration as far as possible and gets final product.24 ° of slant settings of the optical axis of dmd chip and illumination path are on the image planes of illuminating lens.Lay a plane mirror directly over dmd chip, catoptron is used for changing optical axis direction, makes illumination relay lens group and projection objective separately, and is unlikely to influence each other.A part of illuminating bundle is blocked in the almost unavoidable meeting of plane mirror.Theoretical and experiment can draw, if plane mirror in the conjugation of hollow square rod entrance to the illumination relay lens group, the light beam that this part is blocked can affect the homogeneity of DMD illumination hardly.Plane mirror and projecting light path's optical axis included angle are 50 °, can naturally separate like this locus of optical projection system and dmd chip.The reflected light (Infrared Scene) of modulating through the DMD micro mirror array projects through heart projection objective far away.Owing to be heart framework far away, the entrance pupil of lens objectives should be at negative infinite point.
In order to improve capacity usage ratio, optical projection system and illuminator should have equal work F number.And determining of optical projection system F number generally determined by resolution and the diffraction limit of whole system.
Description of drawings:
Fig. 1 is infrared DLP light engine structural representation of the present invention.
Fig. 2 is the structural representation of illuminator in the infrared DLP light engine of the present invention.
Fig. 3 is the synoptic diagram of optical projection system in the infrared DLP light engine of the present invention.
Fig. 4 is among the present invention, illuminator and reflector position explanation synoptic diagram.
After Fig. 5 was this employing invention system, computing machine illumination software emulation obtained the illuminating effect figure on DMD surface.
Embodiment:
As shown in Figure 1, the present invention includes: infrared light supply 1, spheroid shape reflector 2, hollow square rod 3, illumination relay lens group 4, DMD micro mirror array 5, plane mirror 6, projection objective 7.Infrared light supply 1 places on the focus of ellipse reflector 2, and according to the geometric properties of ellipse, its light beam will converge on another focus of spheroid shape reflector.Reflectance coating will be plated in reflector inside, and at infrared band reflectivity more than 90% is arranged.Reflector 2 the rims of a bowl size should be determined by the numerical aperture of follow-up illumination relay lens group 4.
As shown in Figure 2, be the illuminator synoptic diagram among the present invention.Among the present invention, hollow square rod 3 exits are uniform light distribution, so illuminator adopts critical illumination, hollow square rod outlet is a pair of image conjugate relation with the position of DMD micro mirror array.Among the present invention, illumination relay lens group 4 (is eliminated aberration optimization except satisfying hollow square rod 3 outlets with the image relation of DMD micro mirror array 5, the general spherical aberration of eliminating gets final product), also should satisfy the image conjugate relation (satisfying Gaussian optics image relation gets final product) of hollow square rod 3 entrances and plane mirror 6 positions.And illumination relay lens group 4 need to satisfy the coupling of the optical extend between light source/square rod and the demonstration/projection objective, the capacity usage ratio of raising whole system.According to the requirement of Infrared Scene Generator resolution and the diffraction limit of infrared band, determine work F number and the numerical aperture of illuminator.For assurance is telecentric beam path, the emergent pupil of illumination relay lens group 4 should be at infinity.
As shown in Figure 3, be projection objective synoptic diagram among the present invention.Adopt the object space telecentric beam path, must optimize and eliminate all kinds of primary aberrations, dot chart is controlled in the diffraction limit.Must be noted that in the Infrared Scene analogue system parameter of projection objective system should cooperate the follow-up optical parametric of examining system for the treatment of to determine, the emergent pupil of optical projection system needs and treats the entrance pupil coupling of examining system, and field angle should be in system testing scope to be measured.During the projection optics camera lens, must reserve enough DMD to the distance of first eyeglass, to make things convenient for mounting plane catoptron 6 among design the present invention.
Analyze critical illumination system among the present invention by the Fourier optics angle now as shown in Figure 4.In projecting light path, owing to only have 24 ° angle between illuminating bundle and the folded light beam, so consider the factors such as lens barrel is installed, illuminating lens very likely contacts on the space with projection objective.For fear of interacting holding plane catoptron 6 before dmd chip.Can find out that plane mirror 6 has blocked the partial illumination light beam.The illuminating ray of all directions enters hollow square rod 3 inside, because the angle that enters is different, the reflection of different number of times occurs in square rod.Behind the light reflection, form a virtual light source, behind the Multi reflection, just form a virtual two-dimension light source array 8.This two-dimension light source array should form conjugate relation with the position of holding plane catoptron 6 in the porch of hollow square rod 3.From the angle of Fourier optics, two-dimension light source array 8 is light sources, and the outlet of hollow square rod 3 is object planes, and the position of plane mirror 6 is frequency plane (being with normal phase factor), and the position of DMD micro mirror array 5 is image planes.Concrete theoretical analysis and derive with reference to Su Xianyu " information optics " chapter 2 of Li Jitao.According to the method for spatial filtering, on frequency plane, shelter from decentering point spectrum distribution far away, will filter the high-frequency information of object space.Filtering the part high-frequency information can't affect the homogeneity of imaging.Even cover half light, can realize Uniform Illumination.Plane mirror and projecting light path's optical axis included angle are 50 °, can naturally separate like this locus of optical projection system and dmd chip.
As shown in Figure 5, for illuminating effect on the dmd array after the Computer Simulation.Left figure is not during holding plane catoptron 6, the illuminating effect on the dmd chip, right figure be the holding plane catoptron behind frequency plane shown in Figure 5, the illuminating effect on the dmd chip.Can find out that except light intensity slackened, its spatially uniform did not almost change.
Claims (1)
1. one kind infrared DLP projection optical system, comprise: infrared light supply (1), elliposoidal reflector (2), hollow square rod (3), illumination relay lens group (4), DMD micro mirror array (5), plane mirror (6) and projection objective (7), it is characterized in that: infrared light supply (1) places on the focus of elliposoidal reflector, and its light beam converges on another focus of elliposoidal reflector; Place hollow square rod (3) entrance in another focus that converges, after light enters hollow square rod, in hollow square rod, behind the Multi reflection, play the effect of a light integrators, obtain uniform light distribution in hollow square rod exit; Behind hollow square rod (3), place illumination relay lens group (4), make the equally distributed light intensity in hollow square rod exit be imaged onto DMD micro mirror array place, the position of the entry position of hollow square rod (3) and plane mirror (6) is in Nonimage Conjugate Relations in the system of illumination relay lens group (4); 24 ° of slant settings of optical axis of DMD micro mirror array (5) and illumination path are on the image planes of illumination relay lens group, plane mirror (6) be placed on DMD micro mirror array (5) directly over, become 50 ° with DMD micro mirror array (5) normal direction, the light modulated that plane mirror (6) reflects the DMD micro mirror array is introduced projection objective (7) and is formed infrared target.
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| CN 201110117425 CN102213906B (en) | 2011-05-06 | 2011-05-06 | Optical engine of infrared digital light processing (DLP) telecentric projection system |
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| CN108152937B (en) * | 2017-11-13 | 2020-04-14 | 长春理工大学 | Infrared medium/long wave zooming projection lens |
| CN108333720B (en) * | 2018-03-21 | 2023-08-01 | 中国航空工业集团公司洛阳电光设备研究所 | Medium wave infrared imaging system |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2002287081A (en) * | 2001-03-27 | 2002-10-03 | Hitachi Ltd | Reflection type projector device |
| JP2003075768A (en) * | 2001-09-05 | 2003-03-12 | Minolta Co Ltd | Optical system for projector |
| CN202057893U (en) * | 2011-05-06 | 2011-11-30 | 中国科学院上海技术物理研究所 | Infrared DLP (digital light processing) telecentric projection system |
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Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2002287081A (en) * | 2001-03-27 | 2002-10-03 | Hitachi Ltd | Reflection type projector device |
| JP2003075768A (en) * | 2001-09-05 | 2003-03-12 | Minolta Co Ltd | Optical system for projector |
| CN202057893U (en) * | 2011-05-06 | 2011-11-30 | 中国科学院上海技术物理研究所 | Infrared DLP (digital light processing) telecentric projection system |
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