CN1683986A - Laser perspective projection method and its device - Google Patents
Laser perspective projection method and its device Download PDFInfo
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- CN1683986A CN1683986A CN 200410030575 CN200410030575A CN1683986A CN 1683986 A CN1683986 A CN 1683986A CN 200410030575 CN200410030575 CN 200410030575 CN 200410030575 A CN200410030575 A CN 200410030575A CN 1683986 A CN1683986 A CN 1683986A
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Abstract
The present invention discloses a kind of projection method based on perspective imaging principle and image projecting display device comprising laser, positioning mirror, scanning mirror, motor, beam regulating mirror and image source. The present invention features that the laser is processed with positioning mirror, scanning mirror, beam regulating mirror and other parts. Based on point light source perspective projection imaging principle, the filtering image source is set in the proper position of conic light beam to obtain projected magnified image. The present invention has simple structure, less light energy loss and other advantages and has wide application range.
Description
One, technical field
The present invention relates to a kind of projection arrangement, especially is the projection arrangement of base components with the laser instrument.
Two, background technology
Distinguish by image source (being projected enlarged image), there are two big classes in existing shadow casting technique: electronic imaging class (video class) and non-electronic imaging class.
The shadow casting technique of the present main flow of electronic imaging class has three kinds: projection cathode-ray tube technology CRT, liquid crystal display technology LCD (comprising liquid crystal on silicon chip technology LCOS), digit optical treatment technology DLP.
The history of CRT technology is the longest, and maturity is the highest.Its major advantage is: cost is low, rich color, and response speed is fast.Its major defect is: volume is big, and optical system is huge, signal processing circuit is complicated, has linear distortion, the operating voltage height, and fear magnetic, the brightness and the sharpness upper limit are low.In the CRT technology, image source itself is exactly a light source, belongs to the fluorescent type technology.This shadow casting technique mainly is used in the projection type large screen projection TV set.
The LCD technology also has long history, and is very ripe.LCD panel technology wherein can satisfy the needs of many aspects, and the light engine technology has also had significant progress.Its major advantage is: cost is low, and volume is less, the brightness abundance.Its major defect is: color is flat, and response speed is slower, the light path complexity, and optical length, light image efficient is low, and power consumption is big.LCD shadow casting technique needs independent light source part, belongs to optical filtering type shadow casting technique.At present, this technology all has application very widely in orthogonal projection and back projection equipment.
The history of liquid crystal on silicon (LCOS) technology is shorter, but it has the place more superior than LCD technology.Especially aspect brightness, have outstanding performance.Because the full color chip technology is had any problem, and uses color separating and combining system at present in three chip architectures, uses the colour field mode in single chip architecture.Therefore, its main shortcoming is: the light path complexity, and optical length, light image efficient is low, and power consumption is big.The LCOS technology belongs to optical filtering type shadow casting technique.
The DLP technology is relative newer shadow casting technique.It can reach the color effect as the CRT technology, and the volume that is better than LCD equipment is arranged, and the characteristics of real digital imagery are arranged.And its optical system is more simple, and brightness is higher.It can keep the advantage of above-mentioned two kinds of technology basically, can overcome their some shortcomings simultaneously again.But its micro-reflector can not be very little, still with mechanical motion mode work, adds the colour field mode and work, and colored numerical digit and response speed are restricted, and the number of colors and the sharpness upper limit are not high.Its product price still is higher at present.This technology produces pixel with the micro mirror reflection ray, belongs to light deflector type technology, mainly is used in the orthogonal projection and back projection equipment of middle and high end at present.
Non-electronic imaging shadow casting technique is film and diaprojection technology commonly.The image source states of matter is changeable in its equipment.Their source images generally is static, carries out the states of matter form and switch when projection.When with the very close image subject string of sufficiently high speed switch contents, will be at the image of to screen, seeing continuous innervation.The principle of Here it is film projector.This class technology mainly is used in the optical filtering type image source of the non-electronic signal of projection.Their major defect is: light utilization efficiency is low, and brightness is on the low side, and the light source thermal value is big, breaks down and burns out the image source sheet easily.This class technology belongs to optical filtering type shadow casting technique.
Several technology of above technology have two main characteristics.One, they all must use the camera lens projection.The camera lens relative aperture is limited, and shadow efficient is low.The heavy caliber camera lens that the large-size images source needs, the requirement of manufacturing technology and technology is very high, the cost height, volume is big.Small-bore camera lens can only be used for the small-sized image source, and resolution is restricted.Two, light source is undesirable.In the CRT technology, image source is exactly a light source, and its brightness is limited, is not suitable for giant-screen orthogonal projection usefulness, and needs very high voltage and high negative pressure, and volume is big, and power consumption is big, and is easily old and feeble.The light source of other technologies all is a thermal light source, though frequency spectrum is abundant, do not lack look, thermal value is big, and power consumption is big, and serviceable life is not long.
Comprehensively above-mentioned, all there is the limitation of some aspect in present various shadow casting techniques, can not satisfy actual needs.People's choice of when using projector equipment, all having to accept or reject.Particularly aspect brightness, aforesaid technology still can not adapt to the needs that outdoor ultrahigh resolution demonstration and outdoor overlarge area show as daytime.
Three, summary of the invention
The objective of the invention is: utilize the perspective imaging principle to simplify projection arrangement, improve shadow efficient, on the basis of existing proven technique, provide the image projection display device and huge, the miniature image projection display apparatus of super brightness at low cost.
To achieve these goals, the present invention mainly is made of laser instrument, positioning mirror, scanning mirror, motor, synchronizer, beam regulating mirror, image source, extender and aligner.They are used to solve the following problem that the present invention need solve:
(1) imaging problem
The present invention mainly realizes projection according to perspective imaging principle (point-sourcre imaging principle).
The perspective imaging principle is: because the rectilinear propagation character of light, under the pointolite irradiate light, the shade of object has only umbra, does not have penumbra, and image contour is clear fully.Therefore, utilize the perspective imaging principle, do not need imaging lens, also can obtain projection enlarged image clearly, thereby also do not have whether accurately problem of camera lens focusing.Perspective imaging will obtain stratified image, and the image source that is projected must be the optical filtering type, comprises infiltration type and reflection-type.At present, this class image source mainly contains: cinefilm, lantern slide, LCD panel (the liquid crystal on silicon sheet that comprises reflection-type).
Strict parallel laser beam becomes cone-shaped beam by the function lens, just has pointolite character, can be used for the perspective imaging projection.These lens can be convex lens or concavees lens, can also be cylindrical lenses.
(2) even optical issue
Even optical issue is a key issue of the present invention.Laser beam directly is used in the projector equipment, and the blackening in the hot spot can interference images.Therefore to do even optical processing to light beam, eliminate blackening.The present invention requires also will keep the point source of light beam at even light simultaneously, and therefore, below explanation also will relate to the parts of perspective imaging needs.The invention provides two kinds of even light methods: the even light method (abbreviation scanning method) of even light method (abbreviation summation) and scanning adds up.
1, the even light method that adds up.The blackening of laser instrument hot spot is irregular.According to Probability Statistics Theory, after the hot spot of numerous irregular uneven brightness adds up, in the hot spot everywhere average light energy near equating, the hot spot brightness of promptly feeling on certain level near evenly.Laser instrument is many more, and the back hot spot uniformity coefficient that adds up is good more.This method is luminous in turn fast by a plurality of laser instruments, switches by mechanical means, so make these light amount last phases when a bit sending from the space, the same target of directive adds up, and obtains even light effect.
The even light method that adds up is best suited for the impulse type laser instrument.Laser instrument switches luminous frequency and will match with the frequency that switch the scanning mirror side.Roughly determine this frequency minimum according to number of lasers, in the scope of permissions such as technical conditions, cost condition, get more laser instrument.
2, the even light method of scanning.The even light method of scanning is best suited for the continuous type laser instrument.Before the image source, banded laser beam treatment is become fan beam at laser beam irradiation.When fan beam projects image source, form a thin bright line.According to Probability Statistics Theory, can think that the brightness of whole piece bright line is uniform.Allow bright line make uniform translation along its vertical direction, order is shone the image source each several part, and the each point luminous energy is finished even light about equally on the sensitive surface.
Two kinds of even light methods can both keep the pointolite character of laser beam, and strong point and the shortcoming of oneself respectively arranged.Add up and spare light method light efficiency height, can hold a fairly large number of laser instrument, power capacity is big, has the color mixture function concurrently, is suitable for pulse class light source.But its even light effect and quantity of light source are in direct ratio, and promptly the multiple-effect fruit is good more more for laser instrument.Therefore, relatively poor as laser beam quality, just need more laser instrument.The even light method that adds up is generally used in large-scale, huge, high brightness front projection display device.The even light method of scanning has the advantage that the laser instrument consumption is few, effective, light efficiency is high, also have the color mixture function concurrently, but it is not suitable for short pulse class light source, generally uses in middle-size and small-size just, back projection equipment and amalgamation large display screen.
Below even light of the present invention and each parts of imaging device are elaborated, comprise laser instrument, positioning mirror, scanning mirror, motor, synchronizer, beam regulating mirror, image source, extender and aligner etc.Wherein, the optical difference of image source influences to some extent to the structure of device.
In the device of infiltration type image source, laser instrument is a light source, also is image-forming block.If the light beam of its output is too thick, the scanning mirror reflection side needs bigger useful area with regard to face.Can cause the long-pending excessive and increased power dissipation of scanning mirror cylindrical shell like this, perhaps mirrored sides quantity is very few and influence switching frequency.Among the present invention, generally requiring light beam is that xsect is that four prism type light beam or cross section are the ribbon beams of elongated rectangular.
Because reflective surface is not on rotation axis, when scanning mirror rotated, cone of beam angular vertex physical location will produce skew.Be unfavorable for when serious that primary color image overlaps.So, guarantee that this skew less than certain amplitude, used positioning mirror in the device of the present invention.Positioning mirror has two effects.First effect is to allow laser beam project scanning mirror or beam regulating mirror in the deflection among a small circle from one.Second effect be, makes laser instrument easier for installation, and the position is more flexible.Positioning mirror is worked in the reflection mode, and the reflective operation face is little, keeps to the side.The arrangement requirement of all positioning mirrors will make and look from the reflecting surface of scanning mirror, after positioning mirror can and only to see the workplace part.Like this, the incident angle of laser beam on the scanning mirror side is interval minimum, and skew is minimum.A plurality of located in connection mirrors can integrated design.
In two kinds of even light methods, scanning mirror all is the core component of even light.The basic configuration of scanning mirror is a prismatic tube, and reflective side is made of sphere, the face of cylinder or plane.The spherical scanning mirror even light method that is used to add up; The face of cylinder bus of cylinder scanning mirror is vertical with the scanning mirror axle, is used to scan even light method; The flat scanning mirror can be used in two kinds of even light methods.Scanning mirror is pivoted by motor drives, switches reflective surface.By synchronizer control, make the luminous moment of different laser instruments, just corresponding to the different reflectings surface that switch to current appropriate location, the axis of all light beams after requiring to reflect is all in a plane perpendicular to the scanning mirror axle.In the summation, these beam axis directions immobilize, in the scanning method, and the scanned sector of these beam axis.
Beam regulating mirror has two kinds of situations: in the even light method that adds up, beam regulating mirror is a negative focal power camera lens that two-dimentional focal power is variable, is quadrature set of cylindrical lenses or sphere, ellipsoid lens combination.It is placed on after the scanning mirror, output pyramid light beam.If the cone angle size of spherical scanning mirror output beam meets the requirements, this beam regulating mirror can omit.In the even light method of scanning, beam regulating mirror is a positive focal power camera lens that the one dimension focal power is variable, is set of cylindrical lenses.It is placed on before the scanning mirror.All all enter the beam regulating mirror arrangement from the light beam of each location mirror rice, become the fan-like pattern light beam.The fan-shaped summit of fan beam is that the convergent point of light beam drops on the scanning mirror reflective surface and the sector summit of beam axis scanning overlaps.
Extender mainly is used in the occasion that needs the wide-angle projection.For example in RPTV, projection angle generally will be more than 50 degree.From beam regulating mirror go out rice light beam, cone angle should not be too big.Otherwise because the viewing angle characteristic of liquid crystal display, projected image easily produces dark angle.So extender need be set, to enlarge projection angle.
Aligner is a physical construction.Perspective imaging principle according to pointolite, when plane, light source point place, when these three planes of plane, image source place and screen plane were all parallel to each other, the geometric configuration of projected picture kept similarity, and the ratio of similitude of each image field passage equates, all with the orientation independent of projection.In twos between image source or the scanning mirror assembly, establish helical member or wedge spare, the link member etc. of synchronization action, constitute aligner.Keeping under the situation of three image source center conllinear, three scanning mirror axle conllinear and above-mentioned parastate, adjusting the spacing between image source in twos or the scanning mirror assembly, making the picture strictness of each passage projection overlapping, be mixed into full-color image.
Synchronizer is an electronic circuit, is used to control the luminous phase place of each laser instrument, is synchronized with current scanning mirror side.Establish a reflective mirror at scanning mirror, cooperate with it, obtain motor corner and rotary speed information, control the laser instrument switch in view of the above with a photoelectric sensor.
Laser instrument and liquid crystal type image source are polarizer.To determine the angle of laser instrument during actual installation, both are conformed to the polarization direction.
In the device of reflection-type image source, except that extender, the basic element of character is the same with the device of infiltration type image source.Different is their positions in the optics distance.Concrete condition is as follows:
When 1, the even light method of reflective image source and scanning cooperates, wish that the light beam that incides image source has less incident angle.For this reason, earlier at convex lens of the positive placement of image source.Then, be placed on the cylinder scanning mirror near the convergent point of convex lens light beam, depart from less angle of its optical axis.Image source incident and beam reflected are assembled by convex lens, and convergent point drops near the of cylinder scanning mirror and light beam is not blocked.After this convergent point, place a varifocal mirror, work the projected angle effect of adjusting.
When 2, the reflective image source and the even light method that adds up cooperate, wish that also the light beam that incides image source has less incident angle.Spherical reflector with a suitable radius is done beam regulating mirror.This beam regulating mirror is placed near the convergence of rays point of convex lens, a less distance is arranged with optical axis.By filter light beam after the modulation of image source,, enter a varifocal mirror again and adjust cone angle, directive screen because of the effect of convex lens converges at beam regulating mirror convergent point nearby.
(3) full color problem
At present, solid kind red laser, green (light) laser, the blue laser commercialization of needed watt of level luminous power output of display device.The laser instrument of some type can export average power or continuous power reaches tens of watts.The present invention can adopt the various laser instruments of gas, solid, liquid according to actual needs, and luminous power problem and full color problem can both solve.In addition, the full-color image problem can also solve with white light laser.
The present invention is directed to laser instrument of different nature and image source, when solving the full color problem, install used parts and change to some extent, the 26S Proteasome Structure and Function of some parts of using also has corresponding variation.Specific as follows:
1, image source is full-color colour pattern, and the present invention only needs a cover as the above-mentioned device that is used for even light and imaging, and this structure is called single source formula.All single sources formula structure can adopt primary colours laser instrument or white light laser.If use the even light method that adds up in the formula device of single source, no matter laser instrument is white light or primary lights laser instrument, various laser instruments all need several even tens up to a hundred.
2, in the formula device of single source as adopt the even light method of bright line scanning, just only need few laser instrument.When laser instrument hot spot uniformity coefficient is enough good, minimum needs one sublaser of a kind of color.If use the primary colours laser instrument, coloured light mixes and can realize by scanning, also can realize by prism.
If 3 image sources are GTG types, obtain the full color projected image, the device that just needs three covers to spare light and imaging provides the projected image of three kinds of primary colours, and such structure is called three source formulas.Except laser optical color difference, motor and aligner are shared in each covering device, and miscellaneous part is identical.Coloured light mixes to be realized by aligner.In addition, because primary lights can be flux matched or installation etc., allow the above said apparatus of three covers in the reality.
Compare with traditional projection arrangement, device of the present invention has following advantage:
1, shadow efficient height.Because laser beam has parallel character, optical energy loss is few when processing beam, and the light major part of exporting from laser instrument can both project on the image source, is used to form image.
2, brightness height.Because more existing visible lasers (as gas laser) can be exported the luminous energy that continuous power reaches tens of watts, the average light power of impulse type laser instrument also has several watts to tens of watts.In custom-designed super and huge projection arrangement, amount to the projected light beam energy and can average out ten watts, even hundreds and thousands of watts.Therefore, device of the present invention can have super brightness.
3, low in energy consumption.Laser instrument is the luminescence source, and electrical efficiency is higher, the pulsewidth of paired pulses type laser instrument less demanding (Millisecond, microsecond level), and the pumping power consumption is less relatively.It need not powerful heat abstractor support, has also just saved the heat radiation energy consumption.
4, simple in structure.Overall process, has only the luminous FEEDBACK CONTROL that needs of sweep velocity and laser instrument from light source to the screen image; Each several part independence is strong, and interface is simple, clear in structure.
5, the life-span is long.Critical piece is in no hot state work, and aging rate is slow.
6, maintenance, upgrading are conveniently.The each several part function is independent, and the index of adjacent part is not had strict restriction, can replace parts separately, to recover, to change and to promote performance index.For example, separately the liquid crystal display of 640 * 480 pixels is changed into the liquid crystal display of 1280 * 960 pixels, and miscellaneous part is constant, just can improve 300% resolution.
7, volume is little.In the device of the present invention, parts occupation space such as positioning mirror, scanning mirror, motor, beam regulating mirror can be very little.
8, cost is low.In the device of the present invention, need not expensive light engine and projection imaging camera lens.What price was the highest is laser instrument and image source.The cost of miscellaneous part can be controlled at well below the price of projection imaging camera lens and light engine.When the technology maturation degree was suitable with technical indicator, apparatus of the present invention cost was lower.
9, image color is full.The light excitation of laser instrument is best, so the projected image color saturation is best.
10, structure is flexible.Because realize projection with the perspective imaging principle, the optional scope of image source area is big, can select to use to tens inches from 1 inch with interior.Volume several cubic metres from several cubic decimeters of pocket to super giant can both dispose.
Four, brief description
Fig. 1 is a kind of add up synoptic diagram of single source formula projection arrangement of even light of optical filtering type that sees through.
Fig. 2 is another kind of the add up synoptic diagram of single source formula projection arrangement of even light of optical filtering type that sees through.
Fig. 3 is a kind of synoptic diagram that sees through single source formula projection arrangement of the even light of optical filtering type scanning.
Fig. 4 is the another kind of synoptic diagram that sees through single source formula projection arrangement of the even light of optical filtering type scanning.
Fig. 5 is a kind of synoptic diagram that reflects single source formula projection arrangement of the even light of optical filtering type scanning.
Fig. 6 is a kind of add up synoptic diagram of single source formula projection arrangement of even light of optical filtering type that reflects.
Fig. 7 is a kind of synoptic diagram of three source formula projection arrangements.
Fig. 8 is a kind of screw rod aligner synoptic diagram.
Five, describe in detail
Adopt the course of work of the various structures of the present invention to elaborate below in conjunction with accompanying drawing 1 to 8 pairs in accompanying drawing.
Fig. 1 is a kind of add up synoptic diagram of single source formula projection arrangement of even light of optical filtering type that sees through.
In employing adds up single source formula projection arrangement of even light method, mainly include with lower member: laser instrument 1, positioning mirror 2, scanning mirror 3, motor 4, image source 6.Wherein scanning mirror is a spherical.
This device realizes that the process of projection is: each primary colours or white light laser 1 send prismatic parallel beam, reflex to scanning mirror 3 through corresponding positioning mirror 2, scanning mirror 3 is made when folded light beam axis alignment image source center by motor 4 driven rotary, and corresponding laser instrument is luminous.Because scanning mirror is a sphere, folded light beam is extended to the taper light beam of suitable cone angle, shines on the image source 6, after image source optical filtering transmission, projects Display projector image on the screen.At this moment, the effect of scanning mirror has not been a scanning laser beam, but plays the effect of switching as the luminous laser instrument of current light source.
The laser instrument that this device needs many (only drawing among the figure three).The primary colours laser optical should be white light after mixing, and white light laser does not have mixed problem.
Fig. 2 is another kind of the add up synoptic diagram of single source formula projection arrangement of even light of optical filtering type that sees through.
This device realizes that the process of projection is similar with device shown in Figure 1.Parts comprise laser instrument 1, positioning mirror 2, scanning mirror 3, motor 4, image source 6.Wherein scanning mirror is a plane, therefore also will use beam regulating mirror 5.Beam regulating mirror 5 is placed between scanning mirror 3 and the image source 6, and laser beam is expanded to cone-shaped beam.
Fig. 3 is a kind of synoptic diagram that sees through single source formula projection arrangement of the even light of optical filtering type scanning.
This device is applicable to the primary colours laser structure, mainly includes with lower member: laser instrument 1, positioning mirror 2, scanning mirror 3, motor 4, beam regulating mirror 5, image source 6, colour-mixing prism 7.According to the actual needs of projection angle, scanning mirror reflective surface make even face or face of cylinder arch.
This device realizes that the process of projection is: the banded parallel beam that primary colours laser instrument 1 sends, reflex to colour-mixing prism 7 by the positioning mirror 2 of correspondence, and be merged into a branch of white light beam, then, project beam regulating mirror 5 again.Beam regulating mirror 5 changes over the light beam of narrow covering of the fan shape to light beam, and convergent point is on the side of scanning mirror 3.Scanning mirror 3 is by motor 4 driven rotary, and its beam reflected penetrates to screen through image source 6 modulation, with bright line method for scanning original image also.
Fig. 4 is the another kind of synoptic diagram that sees through single source formula projection arrangement of the even light of optical filtering type scanning.
Do not use colour-mixing prism in this device, be applicable to primary colours laser instrument or white light laser.Mainly include with lower member: laser instrument 1, positioning mirror 2, scanning mirror 3, motor 4, beam regulating mirror 5, image source 6.
This device realizes that the process of projection is: laser instrument sends banded parallel beam, by reflexing to beam regulating mirror 5 with positioning mirror 2, is converged to the light beam of narrow sector shape, and the summit is on the scanning mirror side.Scanning mirror beam reflection after, arrive screens through image source 6, be embodied as picture and colour mixture with the bright line scan mode.
Each sublaser is except corresponding oneself positioning mirror separately, and miscellaneous part uses jointly.But the work of each laser instrument is carried out in order usually.That is to say that at any time, each the bar bright line on image source does not overlap.Because positioning mirror is different with respect to the angle of scanning mirror side, for the same side of scanning mirror, there is order difference successively the time that light beam is scanned on the image source.For guaranteeing that each bar bright line can both experience the full width image source, the lasting fluorescent lifetime of laser instrument should be slightly larger than to be swept all over the required time of full width image source.
Because when light beam was scanned on the image source, each laser optical source point that also may produce apparent did not overlap phenomenon.A kind of way of solution is, allows the specific specific positioning mirror of side binding, and just the side forms fixing corresponding relation with specific laser instrument.According to the angle of positioning mirror with respect to scanning mirror, set the side axis with respect to the angle of crossing cardiac diameter in the side, allow and penetrate next light from different positioning mirrors, can both penetrate to same direction after the reflection.Scanning mirror with this character is called different axis side scanning mirror.This scanning mirror allows positioning mirror not do word line arrangement, and it is favourable that the even light method that adds up is increased number of lasers.。
Fig. 5 is a kind of synoptic diagram that reflects single source formula projection arrangement of the even light of optical filtering type scanning.
In projection transposition shown in Figure 5, mainly include: laser instrument 1, positioning mirror 2, scanning mirror 3, motor 4, beam regulating mirror 5, LCOS image source 6, varifocal mirror 8 with lower member.Wherein the scanning mirror side is a face of cylinder arch.At the positive plano-convex lens (not drawing among the figure) of placing of image source.After the focus of plano-convex lens, establish a varifocal mirror 8 and be used to change projected angle.
This device light path as shown in the figure, principle is as previously mentioned.
If in the method, laser instrument is formed by the power match relation with three kinds of primary colours laser instruments, so, realizing even light simultaneously, has also finished colour mixture.
Fig. 6 is a kind of add up synoptic diagram of single source formula projection arrangement of even light of optical filtering type that reflects.
In projection arrangement shown in Figure 6, mainly include: laser instrument 1, positioning mirror 2, scanning mirror 3, motor 4, beam regulating mirror 5, LCOS image source 6, varifocal mirror 8 with lower member.Wherein the scanning mirror side is the plane, and beam regulating mirror is a spherical reflector.At the positive plano-convex lens (not drawing among the figure) of placing of image source.After the focus of plano-convex lens, establish a varifocal mirror 8 and be used to change projected angle.
This device light path as shown in the figure, principle is as previously mentioned.
Fig. 7 is a kind of synoptic diagram of three source formula projection arrangements.
Three source formula devices adopt the single source of three covers formula device, the image of a kind of primary colours of every suit projection.But motor can be shared, and three scanning mirrors are installed on same the axle.This programme is the even light type device (in fact every suit list source structure can adopt any one in above-mentioned Fig. 1, Fig. 2, Fig. 4, Fig. 5, these five kinds of structures of Fig. 6) of scanning.As previously mentioned, after the accurate calibration of screw aligner, the picture of each passage projection can be strict overlapping.The image of various primary colours mixes at the enterprising circumstances in which people get things ready for a trip light of screen, restores coloured image.
Fig. 8 is a kind of screw rod aligner synoptic diagram.
This aligner is the reverse-flighted screw structure.Image source constitutes moving sets on one side on slide bar, on one side on reverse-flighted screw.The both sides image source is connected with screw rod by nut, and nut is fixed on the image source.Mid-image source is fixed in slide bar central authorities.When by knob turn screw rod, the both sides image source is driven through nut by screw rod, to middle or two side shiftings, realizes harmonizing.
Six, implement the choosing example
1, a kind of home projector
This device belongs to civilian projector equipment, and design is that use position fixing in bright room environmental.This device adopts three source formula structures of the even light of scanning as shown in Figure 6.3 to 10 cubic decimeters of design volume.
Do light source with two ruddiness solid state lasers, a green glow solid state laser and two solid blue lasers.Their luminous power coupling requires to mix the back and produces the white light effect.It is 6 watts that design adds up to luminous power, about 2 * 1.5 square metres of projected area.Do image source with three the same GTG optical filtering type liquid crystal displays of specification.The liquid crystal display of corresponding ruddiness, green glow, blue laser is driven by the red, green, blue vision signal respectively.
Three liquid crystal display specifications are between 0.7 to 7 inch, and word order (can horizontal stroke can indulge) on a slide rail is in the plane.This plane is parallel with screen plane.Corresponding three beam regulating mirrors, three scanning mirrors are also in one line, and in plane separately, these planes are all parallel with screen respectively.By aligner, guarantee that the geometric center point of each parts of same chrominance channel or optic center point are all on same straight line.
The cross section of Laser Output Beam is a rectangle, and size is 2 * 0.1 square millimeters.It is 30 millimeters that the scanning lens barrel is provided with circumscribed circle diameter, 48 mirrored sides.When motor speed was per second 25 commentaries on classics, sweep frequency was 25 * 48=120 hertz.The maximum scan angle that allows is 30 degree, and design effective scanning angle is 24 degree.The covering of the fan beam angle is got 34 degree, and effective angle is 32 degree.After the scanning, the effective drift angle solid angle of the cone-shaped beam of vision is 32 * 24 square degree square grades.At this moment, the projector distance=2/2/tan of 2 * 1.5 square metres of breadths (32 °/2)=3.5 meters.
Corresponding each mirrored sides, all laser instruments are all luminous, and the scanning bright line has five the most for a long time.Laser instrument can be luminous continuously to simplify circuit, also can send the broad pulse light beam with economize on electricity with 120 hertz frequency.
2, a kind of super orthogonal projection machine
This equipment belongs to business equipment, adopts three source formula structures of the even light that adds up, and designs in the open occasion and does orthogonal projection and use.About 0.5 to 3 cubic metre of equipment volume.
Designing this device output projected light power is 500 watts.600 watts of light source light output aggregate power, margin of power 20%.With 24 of blue lasers, 24 of green (light) lasers, 24 of red lasers, power match becomes white light source.The projection breadth: daytime the open air: 8 * 6 square metres: night: 80 * 60 square metres.
Three LCD panel specifications are between 3 to 20 inches, and word order is in the plane.This plane is parallel with screen plane.Corresponding three beam regulating mirrors, three scanning mirrors are also in one line, and in plane separately, these planes all need parallel to each other respectively.Simultaneously, aligner can realize that the geometric center point or the optic center point of each parts of same chrominance channel all will be on same the straight line.
The cross section of Laser Output Beam is a rectangle, and size is 3 * 2 square millimeters.It is 100 millimeters that the scanning lens barrel is provided with circumscribed circle diameter, 144 mirrored sides.When motor speed was per second 25 commentaries on classics, switching frequency was 25 * 144=3600 hertz.When the effective drift angle solid angle of cone-shaped beam is 27 * 20 square degree square grades, about 16.7 meters of the projector distance of 8 * 6 square metres of breadths, about 167 meters of the projector distance of 80 * 60 square metres of breadths.
The pulsed frequency of laser works and number of lasers, switching frequency are relevant: the pulsed frequency=switching frequency of laser works/number of lasers.In the present embodiment, the switching frequency of ruddiness, blue light, green (light) laser all is the 3600/24=150 hertz.
Suitably adjust projection angle, can become huge curtain film, precipice curtain film television, ceiling film television to huge curtain, cliff, cloud layer projection.
3, a kind of remote super projector
This equipment belongs to business equipment, adopts single source formula structure of the even light that adds up, and design is done orthogonal projection out of doors and used.
During remote projection, the colour field difficulty of harmonizing is so adopt single source formula structure shown in Figure 2.Design output projected light power is 100 watts.120 watts of light source light output general powers, margin of power 20%.With 20 of blue lasers, 15 of green (light) lasers, 15 of red lasers, power match becomes white light source.Projection breadth: 20 * 15 square metres of nights.
The liquid crystal display specification is that the plane of this screen is parallel with screen plane between 2 to 25 inches.The geometric center point of beam regulating mirror and scanning mirror or optic center point all will be on same the straight line.
The section of Laser Output Beam is a rectangle, and size is 2 * 1.5 square millimeters.It is 50 millimeters that the scanning lens barrel is provided with circumscribed circle diameter, 100 mirrored sides.When motor speed was per second 50 commentaries on classics, switching frequency was 50 * 100=5000 hertz.If the effective drift angle solid angle of cone-shaped beam is 8 * 6 square degree square grades, then the projector distance of 20 * 15 square metres of breadths is about 143 meters.
Because the shared scanning mirror of the laser instrument of three kinds of primary colours, the frequency of operation of all laser instruments are 5000/ (20+15+15)=100 hertz.
4, a kind of giant-screen reflective back projection TV
This device belongs to civilian projector equipment, and design is to use in bright indoor fixing environment.This device adopts three source formula structures of the even light of scanning, works in the back projection mode.
Do light source with a ruddiness solid state laser, a green glow solid state laser and a solid blue laser.Their luminous power coupling requires to mix the back and produces the white light effect.Design load is that the total luminous power is 1000 milliwatts, 100 * 75 square centimeters of screen areas.Do image source with three the same GTG optical filtering type liquid crystal displays of specification.
Three liquid crystal display specifications are between 0.7 to 7 inch, and word order is in the plane on slide rail.Corresponding three beam regulating mirrors, three scanning mirrors are also in one line, and in plane separately, these planes also all need parallel to each other respectively.Simultaneously, aligner keeps image source center, projected image center, the light source point of same chrominance channel all to want conllinear.The reflecting component installation requirement is identical with traditional back projection display apparatus, does not have distortion with projected image and is as the criterion.
The cross section of Laser Output Beam is 2 * 0.1 square millimeters a rectangle.The circumscribed circle diameter of scanning mirror is 30 millimeters, 48 mirrored sides.Motor speed is that per second 25 changes, and sweep frequency is 25 * 48=120 hertz.The maximum scanning angle that allows is 30 degree, and the angle of covering of the fan light beam is got 34 degree, and the effective drift angle solid angle of the cone-shaped beam of vision is 32 * 24 square degree square grades.For satisfying low coverage projection needs, after every picture source, a negative lens is set and makees extender, projected angle is expanded to 60 degree.
5, the super clear display screen in a kind of large-scale open air
This device belongs to enterprise's display device, adopts single source formula back projection structural unit of the even light of a plurality of scannings to be put together, and design is that use fixing out of doors position.
For each unit, all make reflecting type rear-projection structure, similar with giant-screen reflective back projection TV (only with cover parts).Here emphasis is explaining aspect power and the amalgamation.
According to the laser instrument general power, the size of determining unit screen.If the total laser power in each unit is 6 watts, the open air is 10 watts every square metre of display requirements in the daytime, and then the unit screen area is got 0.5 square metre (margin of power 20%), and promptly the unit breadth is for long 0.8 meter, and is wide 0.6 meter.Screen board surrounds with sheet iron, becomes no top box shape.The sheet iron inboard is coated with light-absorption layer, and a mouthful limit adds skeleton, is convenient to the amalgamation connection and projection part's (comprising reflector) is installed.Used liquid crystal display resolution is 800 * 600 pixels.Piece together giant-screen with 15 * 15=225 same unit, resolution is 12000 * 9000=108000000 (100,000,000 zero 8 hundred ten thousand) pixel, display area is 108 square metres, and thickness is less than 0.5 meter, and output image luminous energy maximal value is 5 * 225=1125 watt.
Change laser power, unit number, cellar area etc. in proportion, this device can be done venue, indoor display screen.Utilize number of lasers to carry out luminous power stepping, day and night dual-purpose.If amalgamation face is the face of cylinder, can be used for the high tower periphery, make the display part of rotational display system.
6, a kind of super huge back projection display screen round the clock
This device belongs to enterprise's display device, adopts a plurality of super projectors to work in the back projection mode.Design on the square, outdoor eminence stationary applica-tions such as football field, mountain region, Lincheng uses.
The back projection type drape is done in chemical fabric amalgamation with 16 8 * 6 square metres, and display area is established 32 * 24 square metres, and resolution is 19,660,000 pixels.With 16 resolutions is the super projector of 1280 * 960 pixels, every Output optical power be 500 watts to 25 watts adjustable, every fine curtain of the corresponding blocking of projector.The whole steelframe support of using high at least 24 meters wide 32 meters of all curtains or curtain.At 8 meters behind the curtain support, the parallel projector's support of setting up, 16 projectors evenly distribute on the support.Face section bar material with shading surrounds the space that two stands accounts for altogether, and the heat radiation exhaust fan is installed on top, side.
7, a kind of projection electric torch (hand-held pocket projector)
This device is a civil equipment, can be used for computing machine and shows.Single source formula structure with the even light of scanning shown in Figure 4 is formed, and can omit beam regulating mirror.Three primary colours minature solide-state laers (or a white light laser) luminous power is totally 120 to 1200 milliwatts, and the projection breadth is 20 to 200 cm diagonal lines.Image source be 0.5 to 5 inch with interior full-color liquid crystal display, its resolution index decision projection sharpness.Scanning mirror is cylinder arch side, and face of cylinder radius suitably designs, to omit beam regulating mirror.If be used to transfer the extender of projection angle, making the level angle scope is 10 to 30 degree.10 millimeters of scanning mirror circumscribed circle diameters, 30 sides, rotating speed is got 10 revolutions per seconds.Because omit beam regulating mirror, the projected image length breadth ratio slightly changes, getting light beam band cross section is narrower 0.5 * 0.2 square millimeter, to reduce amplitude of variation.
8, a kind of laser perspective imaging film projector
It adopts the structure shown in the accompanying drawing 1, but need do specialized designs in addition according to motion picture frame rate aspect synchro control.
Do light source with one group of pulsed laser that contains ruddiness, green glow and three kinds of primary lights of blue light, power match becomes white light source.Design output projected light power is 100 watts.With 16 of blue lasers, 16 of green (light) lasers, 16 of red lasers, amount to 120 watts of Output optical power, margin of power 20%.Projection breadth: 24 * 12 square metres of dark environment.
The cross section of Laser Output Beam is a rectangle, and size is 3 * 1.5 square millimeters.It is 100 millimeters that the scanning lens barrel is provided with circumscribed circle diameter, 192 mirrored sides.When motor speed was per second 72 commentaries on classics, switching frequency was 72 * 192=13824 hertz.If the effective drift angle solid angle of cone-shaped beam is 27 * 14 square degree square grades, then the projector distance of 24 * 12 square metres of breadths is about 50 meters.
Because the shared scanning mirror of the laser instrument of three kinds of primary colours, the frequency of operation of all laser instruments are 13824/ (16+16+16)=288 hertz.According to the requirement of film projector, per second is shown 24 frames, and every frame projection 2 times accounts for 1/4th of the frame period at every turn.So single sublaser needs to work in the mode of pulse train.Group's cycle of pulse train is 1/96 second, and every burst of pulses has 3 monopulses, and the cycle of each monopulse is 1/13824 second.
The rest may be inferred, and when motor speed was per second 24 commentaries on classics, switching frequency was 24 * 192=4608 hertz.The frequency of operation of all laser instruments is 4608/ (16+16+16)=96 hertz.If think that still single sublaser works in the mode of pulse train, because of group's cycle of pulse train is 1/96 second, so every burst of pulses has only 1 monopulse.Obviously, change if motor speed is lower than per second 24, the laser pulse frequency is lower than 96 hertz in other words, causes same two field picture can not use up whole laser instrument luminous energy, and so even light effect will be affected.
Claims (8)
1, a kind of method of laser perspective projection display image, and the device of this method of use comprise laser instrument, positioning mirror, beam regulating mirror, scanning mirror, motor, synchronizer, image source.It is characterized in that: described laser instrument is primary lights laser instrument or white light laser, output column or ribbon beam, and quantity is more than one or one; Described positioning mirror is a kind of reflective mirror,, they to the coordination point reflection of scanning mirror when leading flank, may pass through beam regulating mirror to corresponding light beam therebetween; Described beam regulating mirror is the zoom degree camera lens of positive focal power of one dimension or the negative focal power of two dimension, is used for the beam convergence of positioning mirror output is become fan beam (one dimension), perhaps the tapered light beam of beam spread (two dimension) of scanning mirror output; Described scanning mirror is a regular prism shape barrel structure, and reflective side is sphere, the face of cylinder or plane.It forms scanning laser beam by rotating, and perhaps switches current laser beam; Described motor rotates scanning mirror; Described synchronizer is an electronic circuit, is used for the motor speed stabilizing, the phase place of adjustment and stable laser light pulse; Described image source is the optical filtering type, comprises cinefilm, lantern slide, permeation type liquid crystal sheet.
2, projection arrangement according to claim 1 is characterized in that: described device is provided with the screw aligner that reverse-flighted screw constitutes.
3, projection arrangement according to claim 1 is characterized in that: described beam regulating mirror is a spherical reflector.
4, projection arrangement according to claim 1 is characterized in that: described image source is a reflection-type liquid crystal on silicon sheet.
5, projection arrangement according to claim 1 is characterized in that: described image source front is provided with positive lens.
6, projection arrangement according to claim 1 is characterized in that: described scanning mirror is a different axis side scanning mirror.
7, projection arrangement according to claim 1 is characterized in that: between positioning mirror and scanning mirror colour-mixing prism is arranged in the described device.
8, projection arrangement according to claim 1 is characterized in that: described beam regulating mirror is placed between scanning mirror and the image source.
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| CN 200410030575 CN1683986A (en) | 2004-04-12 | 2004-04-12 | Laser perspective projection method and its device |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2008124977A1 (en) * | 2007-04-13 | 2008-10-23 | Ning Yuan | Double video image projection method and apparatus thereof |
| EP2693253A1 (en) * | 2012-07-31 | 2014-02-05 | Delphi Technologies, Inc. | Windshield display system |
| CN109307579A (en) * | 2018-11-28 | 2019-02-05 | 中国航空工业集团公司沈阳飞机设计研究所 | The projection cloth location device of aircraft ground vibration test |
| CN110987357A (en) * | 2019-12-16 | 2020-04-10 | 华中科技大学 | Two-dimensional focusing laser differential interferometer and flat boundary layer density pulsation measurement method |
| CN112985174A (en) * | 2021-02-10 | 2021-06-18 | 上海材料研究所 | Cylindrical orthogonal type sealing rear end cover with rectification effect on shock wave reflection |
-
2004
- 2004-04-12 CN CN 200410030575 patent/CN1683986A/en active Pending
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2008124977A1 (en) * | 2007-04-13 | 2008-10-23 | Ning Yuan | Double video image projection method and apparatus thereof |
| EP2693253A1 (en) * | 2012-07-31 | 2014-02-05 | Delphi Technologies, Inc. | Windshield display system |
| CN109307579A (en) * | 2018-11-28 | 2019-02-05 | 中国航空工业集团公司沈阳飞机设计研究所 | The projection cloth location device of aircraft ground vibration test |
| CN110987357A (en) * | 2019-12-16 | 2020-04-10 | 华中科技大学 | Two-dimensional focusing laser differential interferometer and flat boundary layer density pulsation measurement method |
| CN110987357B (en) * | 2019-12-16 | 2021-01-19 | 华中科技大学 | Two-dimensional focusing laser differential interferometer and flat boundary layer density pulsation measurement method |
| CN112985174A (en) * | 2021-02-10 | 2021-06-18 | 上海材料研究所 | Cylindrical orthogonal type sealing rear end cover with rectification effect on shock wave reflection |
| CN112985174B (en) * | 2021-02-10 | 2023-01-10 | 上海材料研究所 | Cylindrical orthogonal type sealing rear end cover with rectification effect on shock wave reflection |
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