CN105093794A - Double-color laser light source - Google Patents
Double-color laser light source Download PDFInfo
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- CN105093794A CN105093794A CN201510509918.3A CN201510509918A CN105093794A CN 105093794 A CN105093794 A CN 105093794A CN 201510509918 A CN201510509918 A CN 201510509918A CN 105093794 A CN105093794 A CN 105093794A
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B27/00—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00
- G02B27/09—Beam shaping, e.g. changing the cross-sectional area, not otherwise provided for
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B27/00—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00
- G02B27/48—Laser speckle optics
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- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03B—APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR
- G03B21/00—Projectors or projection-type viewers; Accessories therefor
- G03B21/14—Details
- G03B21/20—Lamp housings
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Abstract
The invention discloses a double-color laser light source which comprises a blue laser and a red laser which emit blue laser light and red laser light respectively; and a fluorescent wheel, the surface of which is coated with green fluorescent powders, wherein the green fluorescent powders emit green fluorescence when excited by the blue laser light. The double-color laser light source also comprises a speckle dissipation system. The speckle dissipation system comprises a first diffusion portion which is controlled to rotate, is arranged in a beam shaping optical path of the blue laser light and red laser light and is used for diffusing the blue laser light and the red laser light; and a second diffusion portion which is controlled to rotate, is arranged before a blue laser light, red laser light and green fluorescence incident light bar, and is used for at least penetrating the blue laser light and the red laser light sequentially and forming blue light and red light output. The double-color laser light source can effectively reduce speckle effect and improve display quality of projected images.
Description
Technical field
The present invention relates to field of projection display, particularly relate to a kind of two-color laser light source.
Background technology
Laser is a kind of high brightness, and high directivity sends the light source of monochromatic coherent light bundle, due to the plurality of advantages of laser, in recent years by gradually as light source applications in projection display technique field.But due to the high coherence of laser, inevitably produce speckle effect, this phenomenon is not only especially obvious in the pure laser of use is as the scheme of light source, is also present in laser and fluorescence, and in the scheme of the hybrid light source of laser and LED.So-called speckle refers to that coherent source is when irradiating coarse object, after scattering light, because its wavelength is identical, phase-constant, interference will be produced in space, in space, some part interferes long mutually, and have part to interfere and disappear mutually, final result is on screen, occur granular light and dark spot, namely some unfocused smudgings, long-time viewing easily produces spinning sensation, and this can cause the decline of projected image quality undoubtedly, reduces the viewing experience of user.
The application of two-color laser improves the overall brightness of LASER Light Source, meet the brightness applications demand of current laser projection, but the speckle issue that laser itself brings also increases the weight of thereupon, becomes the obstacle that it is applied.
While application two-color laser light source, how reducing laser due to the speckle effect that self character brings becomes technical matters urgently to be resolved hurrily.
Summary of the invention
The invention provides a kind of two-color laser light source, the first diffusion part being undertaken rotating by controlled and the second diffusion part form dissipation spot system, dissipation spot can be carried out to blue laser and red laser simultaneously, effectively weaken speckle phenomena, solve the technical matters causing projected image quality to reduce owing to using the speckle effect brought of LASER Light Source in prior art.
The present invention is achieved by the following technical solutions:
A kind of two-color laser light source, comprises blue laser and red laser, sends blue laser and red laser respectively; Fluorescent wheel, its surface is coated with green emitting phosphor, and green emitting phosphor excites by blue laser and sends green fluorescence, also comprises dissipation spot system, and this dissipation spot system comprises:
First diffusion part, the first diffusion part is controlled to rotate, and is arranged in the beam shaping light path of blue laser and red laser, for spreading blue laser and red laser;
And second diffusion part, the second diffusion part is controlled to rotate, before being arranged at the incident optical wand of blue laser, red laser and green fluorescence, for timing ground at least through blue laser and red laser and form blue light, ruddiness exports;
Further, the first diffusion part is for being diffusion sheet material, and its surface is coated with diffuser;
Further, the angle of divergence radially outwards the distributing in reducing rule gradually along the first diffusion part of the diffuser of the first diffusion part;
Further, the second diffusion part comprises diffusion region and non-diffusing district, and diffusion region is used for through blue laser and red laser, and non-diffusing district is used for through green fluorescence;
Further, the diffusion region of the second diffusion part is diffusion sheet material, and its surface is coated with diffuser;
Further, non-diffusing district is green color filter or transparent material, for entering optical wand through green fluorescence;
Further, the diffusion region of the second diffusion part comprises blue laser diffusion region and red laser diffusion region, for second diffusion part rotate time timing through blue laser and described red laser;
Further, red laser diffusion region comprises multiple sub-diffusion region, and multiple sub-diffusion region is different to the dispersion angle of red laser;
Further, the dispersion angle of sub-diffusion region to described red laser being positioned at zone line in multiple sub-diffusion region be greater than be positioned at two side areas sub-diffusion region to the dispersion angle of described red laser;
Further, the area being positioned at the sub-diffusion part of zone line in multiple sub-diffusion part is greater than the area of the sub-diffusion part being positioned at two side areas.
Technical solution of the present invention, at least has following Advantageous Effects or advantage:
Because the proliferation part of motion is compared to static proliferation part, static proliferation part is the condition utilizing the space phase increasing laser beam to interfere to destroy this generation of phase-constant, but influence degree is limited, and the proliferation part of motion can to laser beam increase random phase spatially, the generation of random phase, just above can destroy the condition that this generation of phase-constant is interfered largely, thus the coherence of laser beam can be reduced preferably, weaken the speckle phenomena on LASER Light Source projected image.Technical solution of the present invention utilizes this principle, first the first diffusion part is set in the beam shaping light path of blue laser and red laser, first diffusion part is controlled to rotate, for spreading blue laser or red laser, no matter all by increasing the random phase spatially of laser beam, the coherence of laser beam can be reduced to blue laser beams or laser beam, and the second diffusion part is set before blue laser and red laser and the incident optical wand of green fluorescence, second diffusion part is controlled to rotate, timing is at least through blue laser and red laser, laser after involutory light spreads again, further generation random phase spatially, the proliferation part effect of two motions superposes mutually, eliminating coherence has been carried out to laser beam, thus more independently speckle pattern can be formed on projection images for the LASER Light Source projected, and the number of independent speckle pattern is more, utilize the integral action of human eye, the phenomenon of light and shade spot is more weak, thus effectively can weaken the speckle effect of laser, improve projected image display quality.
Simultaneously, move because the first diffusion part is controlled, and be arranged in beam shaping light path, the effect of homogenize light spot energy can be played to laser beam diffusion simultaneously, thus be beneficial to laser beam by during optical mirror slip reduce energy too concentrate in other words energy density high and cause optics generate heat too fast or deposition dust situation occur, the blue laser beams be simultaneously convenient to after homogenize excites fluorescent wheel, improve the launching efficiency of fluorescence, avoid light spot energy uneven, concentration of energy temperature course and cause the calcination on fluorescent wheel surface.。
Further, in technical solution of the present invention, second diffusion part comprises diffusion region and non-diffusing district, diffusion region is for transmission and to blue laser and red laser dissipation spot, but not diffusion region is used for through green fluorescence, have concurrently LASER Light Source dissipation spot and the effect for system output three primary colours, the use of filter wheel parts can be reduced, thus be beneficial to simplification light-source system framework.
Further, technical solution of the present invention, dissipation spot for blue laser and red laser shares the dissipation spot system be made up of the first diffusion part and the second diffusion part, non-is not carry out dissipation spot light path design respectively for every road laser, reduce the complicacy of light source optical path, improve dissipation spot efficiency.
Accompanying drawing explanation
Fig. 1 is the embodiment of the present invention 1 two-color laser light-source structure schematic diagram;
Fig. 2 is the embodiment of the present invention 2 two-color laser light-source structure schematic diagram;
Fig. 3 A, Fig. 3 B is be by the laser facula schematic shapes after proliferation part in the embodiment of the present invention 2;
Fig. 4 is the first diffusion part schematic diagram in the embodiment of the present invention 2;
Fig. 5 is fluorescent wheel plane distribution schematic diagram in the embodiment of the present invention 2;
Fig. 6 is the second diffusion sheet schematic diagram in the embodiment of the present invention 2;
Fig. 7 is another second diffusion sheet subregion schematic diagram in the embodiment of the present invention 2;
Fig. 8 is laser beam energy Gaussian distribution schematic diagram in the embodiment of the present invention 2.
Embodiment
In order to make the object, technical solutions and advantages of the present invention clearly, below in conjunction with accompanying drawing, the present invention is described in further detail, and obviously, described embodiment is only the present invention's part embodiment, instead of whole embodiments.Based on the embodiment in the present invention, those of ordinary skill in the art, not making other embodiments all obtained under creative work prerequisite, belong to the scope of protection of the invention.
Embodiment 1
The embodiment of the present invention 1 provides a kind of two-color laser light source, as shown in Figure 1, comprise blue laser array 11 and red laser array 12, send blue laser and red laser respectively, fluorescent wheel 4, its surface is coated with green emitting phosphor, green emitting phosphor excites by blue laser and sends green fluorescence, wherein, blue laser and red laser also will carry out shaping through light-beam forming unit 2 before entering fluorescent wheel 4 and closing light parts 5, the first diffusion part 31 of dissipation spot system 3 is comprised at light-beam forming unit 2, wherein the first diffusion part 31 is controlled rotates, be arranged in the beam shaping light path of blue laser and red laser, for spreading this blue laser and red laser.Blue laser reflexes to fluorescent wheel through closing light parts 5, and again arrive conjunction light parts 5 through fluorescent wheel transmission and relaying loop optical path, and exported by reflection, red laser and green fluorescence group are respectively through reflection and the transmission of closing light parts 5, and three kinds of blend of colors form white and close light.Second diffusion part 32 is controlled to rotate, be the proliferation part of a motion, before it is arranged at the incident optical wand 6 of blue laser, red laser and green fluorescence, for timing ground at least through blue laser and red laser, due to by rotate carry out timing through blue and red laser, thus output blue light and the ruddiness of timing can be formed, may be used for for system exports three primary colours.Second diffusion part 32 and the first diffusion part 31 form the dissipation spot system of embodiment of the present invention LASER Light Source.
Optical wand 6 is collected three primary colours light and is entered x ray machine part (not going out in figure), realizes LASER Light Source for x ray machine part and provides illumination.
In embodiments of the present invention, because blue laser and red laser are successively by the first diffusion part and second diffusion part of dissipation spot system 3, two proliferation parts of motion can be utilized simultaneously to carry out dissipation spot to blue laser and red laser, solve the technical matters of the projected image display quality difference brought due to speckle effect when two-color laser light source uses; The first diffusion part simultaneously moved can also play the effect of homogenize light spot energy simultaneously simultaneously to laser beam diffusion, thus be beneficial to laser beam by during optical mirror slip reduce energy too concentrate in other words energy density high and cause optics generate heat too fast or deposition dust situation occur, the blue laser beams be simultaneously convenient to after homogenize excites fluorescent wheel, improve the launching efficiency of fluorescence, avoid light spot energy uneven, concentration of energy temperature course and cause the calcination on fluorescent wheel surface; And second diffusion part playing dissipation spot effect also the output blue light of timing and ruddiness simultaneously to blue laser and red laser diffusion successively, can be used for for system provides three primary colours to export.
Embodiment 2
The embodiment of the present invention 2 provides a kind of LASER Light Source, and as shown in Figure 2, for the blue laser array 11 of output blue laser and red laser array 12 homeotropic alignment of output red laser, the light beam that the array of homeotropic alignment sends is also orthogonal.This arrangement mode is beneficial to the volume reduced shared by laser instrument, is conducive to sharing of light-beam forming unit simultaneously.
May brightness disproportionation be there is in the laser facula sent due to laser instrument, and the problem that beam area is excessive, and then cause optics light transmission rate low, fluorescence excitation efficiency is low, and laser beam diffusion angle is greater than optical wand collection angle and causes that laser collection efficiency is low affects the problems such as projection light source brightness, therefore need to reflect laser, a series of beam shapings such as refraction, reduce its angle of divergence, reduce beam area, and homogenize light spot energy, just can be used to illumination through the laser beam of beam shaping, and for the fluorescence excitation of follow-up fluorescent wheel.
Wherein, the first diffusion part is fixedly installed in the beam shaping light path of blue laser and red laser, can be arranged at the rear end of beam shaping light path particularly, for spreading described blue laser and red laser.As described in Figure 2, light-beam forming unit 2 comprises a mirror unit 21, convex lens 22 and concavees lens 23, and preferably light-beam forming unit 2 also comprises the first diffusion part 31, first diffusion part 31 after being positioned at concavees lens and is fixedly installed.Convex lens 22 and concavees lens 23 form telescopic system.Light-beam forming unit carries out conjunction bundle to blue laser and red laser successively, contracting bundle, the Shape correction of homogenize.
Wherein, before mirror unit 21 is positioned at blue and red laser array, and all place in 45 ° of angles with these two laser arrays.Mirror unit 21 can be made up of one group of spaced catoptron of tool, and catoptron optic portion can reflect a kind of light source, and mirror separation can allow the another kind of light source of transmission.Thus only use a mirror unit, just can realize the reflection to a kind of light source in the middle of blue and red laser light source, and the transmission to another kind of light source, the light beam that these two laser arrays can either be exported reduces beam spacing and the consistent synthesis light beam of outbound course, can reach again the object of compact conformation.
Preferably, blue laser and red laser, before reaching mirror unit 21, to collimate through a collimation lens (not shown), to reduce the angle of divergence of laser also separately, more light quantity is arrived or through mirror unit, thus improve the shaping efficiency of laser.
Blue laser after mirror unit 21 conjunction bundle and red laser pass through the telescopic system of convex lens 41 and concavees lens 42 composition successively, the effect of telescope group is herein the bundle that contracted further by laser beam, reduce the area of spot size light beam in other words, improve the transmitance of light beam in back-end optical device.
After telescopic system, blue laser and red laser carry out injection after first time diffusion through the first diffusion part 31, wherein, blue laser is incident to fluorescent wheel 4 through after the first diffusion part 31, and red laser closes light parts 5 through being incident to after the first diffusion part 31.No matter for red laser or blue laser, this first diffusion part can spread laser beam, the space random phase of laser beam can be increased on the one hand by motion, destroy the condition that this generation of phase-constant is interfered, thus reach the object of certain dissipation spot, the effect of homogenize light spot energy can be played on the other hand to laser beam, this point is for particularly important blue laser, because blue laser is using the exciting light as fluorescent wheel, if hot spot does not carry out homogenize, may cause due to laser light spot intensity skewness, local energy is concentrated, when being directly incident on fluorescent wheel surface, light intensity more concentrated laser facula can produce high heat and then calcination is produced to fluorescent wheel surface and damage, causing cannot normal fluorescence excitation, simultaneously no matter for red laser and blue laser, after light spot energy homogenize by all can reduce during subsequent optical parts energy too concentrate in other words energy density high and cause optics generate heat too fast or deposition dust situation occur.
This first diffusion part 31 is arranged at the rear end of beam shaping light path, consider laser through contracting bundle, facula area is less, be beneficial to and be transferred in optical system below by optical mirror slip, now spread again, the diffuser efficiency of laser beam can be improved, simultaneously, in order to reach the condition that incident fluorescence wheel carries out exciting, also must carry out last light spot homogenizing, energy is uniformly distributed.
Particularly, the first diffusion part 31 can be diffusion sheet material, and its surface can be coated with diffuser, can select such as frosted glass or binary devices, can produce diffuse reflection to light, destroys the directivity of laser.Also in diffusion sheet surface working microstructure, same diffuse effect can be played.
Compared to static diffusion sheet parts, the diffusion sheet parts of motion are except increasing the effect of the eliminating coherence to laser beam, to laser beam in other words hot spot homogenize degree also more, as shown in Figure 3 A and Figure 3 B, for forming the shape matching of hot spot after the diffusion sheet parts respectively by static diffusion sheet parts and motion.Energy distribution due to laser is not uniform, through the diffusion sheet parts of motion, along with rotation, the position of spot center also can offset, thus form the effect of multiple Bright folding, and then the area of the final hot spot formed is larger, thus also better to the homogenize degree of laser facula.
Preferably, owing to considering that laser is gaussian shaped profile, as shown in Figure 8.Therefore in order to improve eliminating coherence to laser and homogenize efficiency, the angle of divergence of the diffuser on the first diffusion part surface along described first diffusion part radially outwards in reducing rule distribution gradually, as shown in Figure 4.The angle of divergence of diffuser to laser beam the closer to proliferation part central area is larger, and radially outwards, the angle of divergence of diffuser to laser beam more away from proliferation part zone line is less.
Because image is made up of red-green-blue, laser can provide blue and red two kinds of primary colours in embodiments of the present invention, also needs Wavelength converter to produce the green of one of three primary colours.Fluorescent wheel is conventional Wavelength converter, there is rotating shaft, can hard to bear motor driving rotate, as shown in Figure 5, fluorescent wheel 4 comprises transmissive portions 42 and reflecting part 41, wherein transmissive portions 42 is for transmission exciting light, and the principle of the light that the optical excitation wavelength utilizing wavelength short is long, selects blue laser to be exciting light.Reflecting part 41 surface is coated with green emitting phosphor.When fluorescent wheel 4 rotates, transmissive portions 42 and reflecting part 41, alternately will be in the position of exciting light source incidence.Thus when inciding fluorescent wheel surface through the blue laser of beam shaping, a part of laser can either be transmitted, fluorescence can also be sent by exciting of a part of laser.When fluorescent wheel 4 rotates reflecting part 41 position, blue laser irradiates green light fluorescent powder and sends green fluorescence and go out to reach through the surface reflection of fluorescent wheel 4 and close light parts 5.When fluorescent wheel turns to transmissive portions 42 position, transmissive portions can be clear glass, blue laser through transmissive portions 42, then will be back to optics 5 from the back side of fluorescent wheel 4 through blue laser loop, and blue laser loop is made up of relay lens and catoptron usually.
Preferably, in the front/back of fluorescent wheel 4, can also collimation lens set be set, for reducing to be transmitted laser or by the spread angle of fluorescent light reflected, strengthening the convergence degree of light beam.
After the red laser of beam shaping is then through the first diffusion sheet, be directly incident on optics 5, in the present embodiment, optics 5 can select a slice X to close light microscopic.
Wherein, X closes light microscopic and is made up of the two panels eyeglass of one-tenth arranged in a crossed manner " X " type, and its surface realizes the saturating B of anti-A by plated film, or the color selecting of the saturating A of anti-B passes through effect.Such as, instead be popular in green eyeglass, or anti-green red, saturating blue eyeglass, carry out rational coating by closing on light microscopic sheet at X, and in light path design, allow light avoid the not high region of center of lens transmitance as far as possible, just can realize high reflectance and the high permeability of light.
In embodiments of the present invention, X close light microscopic 5 by the anti-indigo plant of a slice thoroughly red, reveal the green eyeglass and a slice is instead popular in indigo plant, the eyeglass that reveals the green forms, wherein the anti-indigo plant that is popular in reveals the green eyeglass, red laser can be reflected, and blue laser is carried out transmission, blue laser after transmission is popular in green lens reflecting to fluorescent wheel thoroughly by the anti-indigo plant of another sheet again, eventually passes through a series of light path converting and gets back to again X and close light microscopic 5, and is thoroughly popular in green lens reflecting by the anti-indigo plant that X closes in light microscopic 5 and goes out.The green fluorescence of being excited then is reflexed to X by fluorescent wheel and closes light microscopic 5, and close light microscopic 5 counter through X and be popular in reveal the green eyeglass and anti-indigo plant of indigo plant and be thoroughly popular in the equal transmission of green eyeglass and go out, red laser then first by being instead popular in indigo plant, the lens reflecting that reveals the green arrive anti-indigo plant thoroughly red, the lens transmission that reveals the green go out.Travel path such as Fig. 2 that the light of three kinds of colors closes in light microscopic at X closes shown in light light path part.Finally, red laser, blue laser and green fluorescence all close light microscopic 5 through an X and close light formation mixed white light and outgoing in the same direction.
Carry out dissipation spot in order to more effective to laser, after closing light, the mixed light of laser and fluorescence also can will rotate by motor is controlled through the second diffusion part 32, second diffusion part 32 of dissipation spot system 3.Particularly, the second diffusion part 32 can be color wheel structure, and as shown in Figure 6, this colour wheel structure comprises diffusion region 321 and non-diffusing district 322, and diffusion region 321 is for through blue laser and red laser, and non-diffusing district 322 is for through green fluorescence.Diffusion region 321 and non-diffuse district 322 are spliced to form this colour wheel wheel face.
Wherein, diffusion region 321 can select diffusion sheet material to make, and its surface also can be coated with diffuser or arrange microstructure.For spreading blue laser and red laser respectively, diffusion region 321 is divided into again blue laser diffusion region 321B and red laser diffusion region 321R, as shown in Figure 6 for second diffusion part rotate time timing ground successively through blue laser and red laser.
Non-diffusing district 322 can be green color filter or transparent material, such as clear glass, for through green fluorescence, fluorescence is imported optical wand 6 and carries out homogenize.When non-diffusing district 322 is green color filter, the second diffusion part just serves the effect that colour filter exports, and improves the colour purity of green fluorescence.
Redness required by consideration system white balance and blue proportioning, center of circle angle is generally different in other words for the sectorial area of blue laser diffusion region 321B and red laser diffusion region 321R shared by colour wheel structure, and the coated area of the diffuser thus on these two diffusion regions is general also different.Such as in the present embodiment, blue, red and green three's central angle accounting is respectively 15%, 25%, 60%, and specifically blue laser diffusion region 321B accounts for 54 degree, central angle, and red laser diffusion region 321R accounts for 90 degree, central angle, and non-diffusing district 322 accounts for 216 degree, central angle.The colour wheel center of circle angular distribution in red laser diffusion region in above-mentioned second diffusion part, blue laser diffusion region and non-diffusing district is only citing, and the proportioning of R, G, B color is relevant with the white balance required by system, is not limited to above-mentioned numerical range at this.White balance describes red, green, blue three primary colours mixing in display device to generate an index of rear white degree of accuracy, and the factors such as white balance can be subject to looking for temperature, surround lighting affect, and different white balances can present different picture tone.And, in the above-described embodiments, if system speckle phenomena is serious, then needs to reduce the angle shared by portion of non-diffusing district, and increase the angle shared by diffusion region, using the diffusion region of wide-angle to weakening speckle phenomena.
Although the coherence of blue laser and red laser is comparatively close, but because human eye is different with the sensitivity of the speckle that blue laser is formed to red laser, actual conditions are that the speckle sensitivity that human eye is formed red laser is higher, and the dissipation spot therefore for red laser will more be focused on.For red laser diffusion region 312R, multiple sub-diffusion region can be comprised, the dispersion angle of multiple sub-diffusion regions to red laser is set to difference, can be the dispersion angle of sub-diffusion region to red laser being positioned at zone line in multiple sub-diffusion region be greater than be positioned at two side areas sub-diffusion region to the dispersion angle of red laser, and shared area is also greater than the area of the sub-diffusion region of two side areas, the reason of such setting considers that the energy distribution of laser is Gaussian, as schematically shown in Figure 8, the energy of laser beam is comparatively concentrated in centre, therefore the angle of divergence being located the diffusion region in centre position needs larger, and the larger ability of area ratio is effectively dispersed the laser beam that energy is comparatively concentrated.
Such as shown in Fig. 7, red laser diffusion part is 3 sub-diffusion parts of red laser, Ra, Rb, Rc, wherein the fan-shaped central angle of Rb is 45 degree, Ra is 20 degree, Rc is 25 degree, and the angle of divergence of Rb place diffuse reflector can be set to 5 degree ~ 5.5 degree, the angle of divergence of Ra diffuse reflector everywhere can be set to 2 degree ~ 2.5 degree, and the angle of divergence of Rc place diffuse reflector can be set to 2.5 degree ~ 3 degree, setting like this, the gradual arrangement of each sub-diffusion part of red laser diffusion part effectively can carry out eliminating coherence for the feature of gaussian laser type light beam.
In the present embodiment, laser carries out the course of work of dissipation spot and is: light sequential according to laser instrument, when lighting blue laser, blue laser is through beam shaping, through the first diffusion part 31, realize preliminary eliminating coherence and homogenize, close light microscopic 5 through X and reflex to fluorescent wheel 4, when fluorescent wheel 4 forwards transmissive portions 42 position to, and from fluorescent wheel transmissive portions 42 transmission, with after through relaying loop optical path conversion arrive X close light microscopic 5 again reflect output, now, second diffusion part 32 turns to blue laser diffusion region 321B, thus blue laser forms blue light through the diffusion sheet diffusion outgoing of motion.When fluorescent wheel 4 forwards reflecting part 41 to, blue laser is irradiated to the green emitting phosphor of reflecting part 41 surface perimeter part, the green fluorescence sent is reflected by fluorescent wheel and closes light microscopic 5 transmission through X and exports, now, second diffusion part 32 turns to position, non-diffusing district 322, be such as green color filter, thus green fluorescence is through the green color filter of the second diffusion part rotated, forms green glow through colour filter.
In like manner, when red laser is lighted, red laser also through through the first diffusion part 31, realizes preliminary eliminating coherence through light-beam forming unit, arrive and closed light microscopic by X and reflect, now, the second diffusion part 32 forwards 321R position, red laser diffusion region to, and the rotation along with red laser diffusion region 321R is passed through Ra by red laser successively, Rb, Rc, through again spreading, thus red laser is through the diffusion outgoing formation ruddiness of red laser diffusion region 321R.
To sum up, there is provided in two-color laser light source technology scheme at the present embodiment, the blue laser that blue and red laser sends and red laser are first through the first diffusion part 31 of motion, it can be diffusion sheet material, no matter all by increasing the random phase spatially of laser beam, the coherence of laser beam can be reduced to blue laser beams or laser beam.Work as blue laser, when through the second diffusion part 32 moving again after red laser and glimmering actinic light, it can be diffusion sheet material, timing is at least through blue laser and red laser, laser after involutory light spreads again, further generation random phase spatially, the proliferation part effect of two motions superposes mutually, eliminating coherence has been carried out to laser beam, thus more independently speckle pattern can be formed on projection images for the LASER Light Source projected, and the number of independent speckle pattern is more, utilize the integral action of human eye, the phenomenon of light and shade spot is more weak, thus effectively can weaken the speckle effect of laser, improve projected image display quality.
And, the present embodiment is also for the feature that human eye is more responsive to red laser speckle, red laser diffusion region in second diffusion part is divided into multiple sub-diffusion region, and the sub-diffusion region being positioned at zone line is at area with to the sub-diffusion region being all greater than two side areas in the dispersion angle of red laser, thus for the feature of laser beam Gaussian distribution, the dissipation spot effect to red laser can be strengthened further.
Simultaneously, move because the first diffusion part 31 is controlled, and be arranged in beam shaping light path, the effect of homogenize light spot energy can be played to laser beam diffusion simultaneously, thus be beneficial to laser beam by during optical mirror slip reduce energy too concentrate in other words energy density high and cause optics generate heat too fast or deposition dust situation occur, the blue laser beams be simultaneously convenient to after homogenize excites fluorescent wheel, improve the launching efficiency of fluorescence, avoid light spot energy uneven, concentration of energy temperature course and cause the calcination on fluorescent wheel surface.
And, in the embodiment of the present invention, second diffusion part is color wheel structure, comprise diffusion region and non-diffusing district, two parts are by being spliced to form wheel face, diffusion region and non-diffusing district can export blue light to timing successively along with the rotation of colour wheel, ruddiness and green glow, namely three primary colours can be exported in timing ground, thus have concurrently LASER Light Source dissipation spot and the effect for system output three primary colours, the use of filter wheel parts can be reduced, improve the utilization factor of optics in laser source system, be beneficial to and simplify light-source system framework.
And, the embodiment of the present invention, the dissipation spot for blue laser and red laser shares the dissipation spot system be made up of the first diffusion part and the second diffusion part, and non-is not carry out dissipation spot light path design respectively for every road laser, reduce the complicacy of light source optical path, improve dissipation spot efficiency.
Although describe the preferred embodiments of the present invention, those skilled in the art once obtain the basic creative concept of cicada, then can make other change and amendment to these embodiments.So claims are intended to be interpreted as comprising preferred embodiment and falling into all changes and the amendment of the scope of the invention.
Obviously, those skilled in the art can carry out various change and modification to the present invention and not depart from the spirit and scope of the present invention.Like this, if these amendments of the present invention and modification belong within the scope of the claims in the present invention and equivalent technologies thereof, then the present invention is also intended to comprise these change and modification.
Claims (10)
1. a two-color laser light source, comprises blue laser and red laser, sends blue laser and red laser respectively; Fluorescent wheel, its surface is coated with green emitting phosphor, and described green emitting phosphor excites by described blue laser and sends green fluorescence, it is characterized in that,
Also comprise dissipation spot system, described dissipation spot system comprises:
First diffusion part, described first diffusion part is controlled to rotate, and is arranged in the beam shaping light path of described blue laser and red laser, for spreading described blue laser and red laser;
And second diffusion part, described second diffusion part is controlled to rotate, before being arranged at the incident optical wand of described blue laser, red laser and green fluorescence, for timing ground at least through described blue laser and red laser and form blue light, ruddiness exports.
2. LASER Light Source according to claim 1, is characterized in that, described first diffusion part is diffusion sheet material, and its surface is coated with diffuser.
3. LASER Light Source according to claim 2, is characterized in that, the angle of divergence radially outwards the distributing in reducing rule gradually along described first diffusion part of the diffuser of described first diffusion part.
4. LASER Light Source according to claim 1, is characterized in that, described second diffusion part comprises diffusion region and non-diffusing district, and described diffusion region is used for through described blue laser and red laser, and described non-diffusing district is used for through described green fluorescence.
5. LASER Light Source according to claim 4, is characterized in that, described diffusion region is diffusion sheet material, and its surface is coated with diffuser.
6. LASER Light Source according to claim 4, is characterized in that, described non-diffusing district is green color filter or transparent material, for entering optical wand through described green fluorescence.
7. LASER Light Source according to claim 4, it is characterized in that, the diffusion region of described second diffusion part comprises blue laser diffusion region and red laser diffusion region, for described second diffusion part rotate time timing through described blue laser and described red laser.
8. LASER Light Source according to claim 7, is characterized in that, described red laser diffusion region comprises multiple sub-diffusion region, and described multiple sub-diffusion region is different to the dispersion angle of described red laser.
9. LASER Light Source according to claim 8, is characterized in that, the dispersion angle of sub-diffusion region to described red laser being positioned at zone line in described multiple sub-diffusion region be greater than be positioned at two side areas sub-diffusion region to the dispersion angle of described red laser.
10. LASER Light Source according to claim 8 or claim 9, it is characterized in that, the area being positioned at the sub-diffusion part of zone line in described multiple sub-diffusion part is greater than the area of the sub-diffusion part being positioned at two side areas.
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