CN103076712A - Projection light source and projection device using same - Google Patents
Projection light source and projection device using same Download PDFInfo
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- CN103076712A CN103076712A CN2011103297887A CN201110329788A CN103076712A CN 103076712 A CN103076712 A CN 103076712A CN 2011103297887 A CN2011103297887 A CN 2011103297887A CN 201110329788 A CN201110329788 A CN 201110329788A CN 103076712 A CN103076712 A CN 103076712A
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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
- G03B21/2006—Lamp housings characterised by the light source
- G03B21/2033—LED or laser light sources
- G03B21/204—LED or laser light sources using secondary light emission, e.g. luminescence or fluorescence
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B26/00—Optical devices or arrangements for the control of light using movable or deformable optical elements
- G02B26/007—Optical devices or arrangements for the control of light using movable or deformable optical elements the movable or deformable optical element controlling the colour, i.e. a spectral characteristic, of the light
- G02B26/008—Optical devices or arrangements for the control of light using movable or deformable optical elements the movable or deformable optical element controlling the colour, i.e. a spectral characteristic, of the light in the form of devices for effecting sequential colour changes, e.g. colour wheels
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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
- G03B21/208—Homogenising, shaping of the illumination light
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Abstract
The invention provides a projection light source and a projection device. The projection light source comprises a light source and a color wheel. The light source is used for generating exciting light. The color wheel faces the light source, rotates around a rotating shaft, and comprises a plurality of optical wavelength conversion regions which are arranged on a propagation path of the exciting light source to receive the exciting light and to convert the exciting light into fluorescence corresponding to the optical wavelength conversion regions. The fluorescence generates a colored light sequence of a periodic time sequence along with the rotation of the color wheel. The exciting light generated by the light source forms light spots on the color wheel, and the projection sizes of the light spots in the direction of motion of the color wheel are larger than those of the light spots in at least another direction of the color wheel. According to the projection light source, the position and the direction of the exciting light projected onto the color wheel are regulated, so that the fluorescence efficiency of the color wheel can be improved, the temperature of a light spot region on the color wheel can be reduced, the efficiency of output light of the projection light source can be improved, and the stability of the color temperature and the chromaticity of output light beams can be maintained.
Description
Technical field
The present invention relates to the shadow casting technique field, particularly relate to a kind of projection arrangement that utilizes the projection light source of fluorescent powder color wheel and use this projection light source.
Background technology
Along with computer peripheral moves towards mobile gradually, projector apparatus also towards the lightweight development, is taken advantage of a situation and has been expedited the emergence of minitype projection machine.Minitype projection machine mainly is and mobile device is integrated, and is embedded on the devices such as mobile phone, digital camera, panel computer, and provides power supply by the battery of mobile device, can realize carrying truly.
And present common projector UHP (Ultra High Power, ultra high power) light source commonly used because the aspects such as volume, power consumption, heat radiation can't be applied on the minitype projection machine, therefore needs exploitation micro projection light source to cooperate with it.
Compare with traditional UHP light source, the micro projection light source has higher requirement at aspects such as volume, serviceable life, power consumption and heating, colors.Wherein a kind of projection light source is to utilize LD (Laser Diode, laser diode) or LED (Light Emitting Diode, light emitting diode) as excitation source, it is luminous to focus on the fluorescent powder color wheel excitated fluorescent powder by the exciting light that excitation source is sent, and the color sequence of light that produces periodic timing along with the rotation of fluorescent powder color wheel is used as projection light source and uses.
Present fluorescent powder color wheel mainly comprises reflective fluorescent powder color wheel and two kinds of forms of transmission-type fluorescent powder color wheel.For example No. 201010567422.9 patented claim of China discloses structure and the use-pattern of these two kinds of fluorescent powder color wheels.
Seeing also Fig. 1, is a kind of structural representation that adopts the projection light source of transmission-type fluorescent powder color wheel in the prior art.Projection light source 40 comprises fluorescent powder color wheel 41, rotating shaft 42, collector lens 44 and excitation source 45.Fluorescent powder color wheel 41 generally is that the fluorescent powder subregion that will excite different wavelengths of light is coated on the transparent glass and makes and form.The exciting light that LASER Light Source 45 is sent is focused on the fluorescent powder color wheel 41 by collector lens 44, form hot spot 43, along with driving fluorescent powder color wheel 41, rotating shaft 42 42 rotates around the shaft, hot spot 43 also scans irradiation to fluorescent powder color wheel 41, absorbed exciting light by the fluorescent powder of hot spot 43 irradiation areas, be converted into corresponding utilizing emitted light and transmit fluorescent powder color wheel 41 formation projected light beams.
Because the utilizing emitted light of only being changed by fluorescent powder color wheel that projection light source 40 is sent, therefore, for the projection light source 40 that adopts fluorescent powder color wheel, the luminescence efficiency of fluorescent powder and conversion efficiency become the key factor that affects projection light source.Studies show that along with temperature rises, the quantum efficiency of fluorescent powder can reduce, cause the fluorescent powder emergent light to reduce, radiation wavelength also can change, thereby causes the variation of colour temperature, colourity; On the other hand, higher temperature also can be accelerated the aging of fluorescent powder.
And in the prior art, the exciting light that LASER Light Source 45 is sent normally is focused on the fluorescent powder color wheel 41 with the form of a hot spot, this can form very strong optical radiation in the colour wheel zone at hot spot 43 places, produce higher temperature, can reduce luminescence efficiency and the conversion efficiency of fluorescent powder, and then so that the output optical efficiency of projection light source 40 descends, colour temperature, the colourity of output beam change, and cause the image display effect of projector not good.
Therefore, a kind of projection light source need to be provided and use the projection arrangement of this projection light source, to solve the existing above-mentioned technical matters of projection light source of available technology adopting fluorescent powder color wheel.
Summary of the invention
The technical matters that the present invention mainly solves provides a kind of projection light source and uses the projection arrangement of this projection light source, with the output optical efficiency of raising projection light source, and keeps the colour temperature of output beam, the stability of colourity.
For solving the problems of the technologies described above, the technical scheme that the present invention adopts is: a kind of projection light source is provided, comprises: but the colour wheel of excitation source and periodic motion.Excitation source is for generation of exciting light.Colour wheel is arranged on the travel path of exciting light, and colour wheel comprises at least one light wavelength conversion zone, the light wavelength conversion area surface to excitation source to receive exciting light and then to be converted to corresponding stimulated luminescence.Wherein, during the colour wheel periodic motion, the exciting light that excitation source produces forms hot spot at colour wheel, and hot spot is projected in projection size at least one other direction on the colour wheel at the projection size on the colour wheel direction of motion less than hot spot.
For solving the problems of the technologies described above, another technical solution used in the present invention is: a kind of projection arrangement is provided, projection arrangement comprises the digit optical processing unit, projection lens and projection light source, projection light source produces the color sequence of light of periodic timing, and color sequence of light projected the digit optical processing unit, the digit optical processing unit receives the picture signal by outside input projection arrangement, picture signal is treated to the switch controlling signal of the binary data corresponding with color sequence of light, the digit optical processing unit further comprises array of reflective micro-mirrors, switch controlling signal control array of reflective micro-mirrors reflects the color sequence of light of projection light source projection, comprise the projection ray of image information with formation, projection lens projects to projection ray to form on the screen and shows image.But described projection light source comprises for generation of the excitation source of exciting light and the colour wheel of periodic motion; Described colour wheel comprises at least one light wavelength conversion zone, described light wavelength conversion region division on the travel path of exciting light to receive described exciting light and then to be converted to corresponding stimulated luminescence; During wherein said colour wheel periodic motion, the exciting light that described excitation source produces forms hot spot at described colour wheel, described hot spot the projection size on the colour wheel direction of motion less than described hot spot with the perpendicular direction of the direction of motion of colour wheel on projection size
The invention has the beneficial effects as follows: the situation that is different from prior art, projection light source of the present invention is incident upon facula position and direction on the colour wheel by adjusting exciting light, can reduce the dutycycle that fluorescent powder is excited, thereby improve the fluorescence efficiency of colour wheel, and the temperature of spot area on the reduction colour wheel, improve the output optical efficiency of projection light source, keep the colour temperature of output beam, the stability of colourity.
Description of drawings
Fig. 1 is a kind of structural representation that adopts the projection light source of transmission-type fluorescent powder color wheel in the prior art;
Fig. 2 is the structural representation of the preferred embodiment of projection arrangement of the present invention;
Fig. 3 is the projected position design sketch of hot spot of the present invention on colour wheel;
Fig. 4 is the time of being excited of facula position on the colour wheel of the present invention and the graph of a relation of sweep time;
Fig. 5 is along the facula position synoptic diagram of rotating shaft horizontal direction on the colour wheel of the present invention;
Fig. 6 is along the facula position synoptic diagram of rotating shaft vertical direction on the colour wheel of the present invention;
Fig. 7 is the synoptic diagram of the various projection of shape of hot spot on the colour wheel of the present invention;
Fig. 8 is the structural representation of the another kind of embodiment of projection light source in the projection arrangement of the present invention.
Fig. 9 is the structural representation of another embodiment of projection light source in the projection arrangement of the present invention.
Embodiment
Below in conjunction with accompanying drawing, the present invention is described in further detail.
For so that those skilled in the art are easier to understand technical scheme of the present invention, at first structure and the principle of work of projection arrangement of the present invention are described.
Fig. 2 is the structural representation of the preferred embodiment of projection arrangement of the present invention.As shown in Figure 2, projection arrangement 10 of the present invention mainly comprises projection light source 110, digit optical processing unit 120 and projection lens 130.Projection light source 110 is for generation of the color sequence of light of periodic timing, and this color sequence of light is projected digit optical processing unit 120.Digit optical processing unit 120 receives the picture signal of numeral or simulation, picture signal is treated to the switch controlling signal of the binary data corresponding with color sequence of light, reflect by the color sequence of light of the array of reflective micro-mirrors in this switch controlling signal control figure optical processing unit 120 to projection light source 110 projections, comprise the projection ray of image information with formation.The projection ray that projection lens 130 will comprise image information projects to formation demonstration image on the screen 20.
The exciting light that excitation source 111 sends converges on the colour wheel 113 through collector lens 112.By the position relationship between excitation source 111, shaping lens 112 and colour wheel 113 these threes is set, and shaping lens 112 carried out parameter adjustment, can control facula position and the direction of exciting light on colour wheel 113, so that colour wheel 113 has better luminescence efficiency and conversion efficiency.Detail the present invention will be further described in more detail hereinafter, no longer launch herein.
The color sequence of light that comprises stimulated luminescence that shaping lens 114 receives by colour wheel 113 outgoing is carried out beam shaping to it, and the color sequence of light after the shaping is projected on the digit optical processing unit 120.
Motor (not shown) connection rotating shaft 1134 is used for driving around the shaft (not shown) rotation of colour wheel 113.
Digit optical processing unit 120 comprises the circuit board 121 of digital micro-mirror chip (Digital Micromirror Device, DMD) 124, processor 122, storer 123 and carrying said elements.
Digital micro-mirror chip 124 is bases that digit optical is processed (Digital Light Processing, DLP) shadow casting technique, and digital micro-mirror chip 124 can simply be described as being a semiconductor optical switch.Thousands of small square eyeglasses are built upon on the hinge arrangement of static random access memory (SRAM) top and form digital micro-mirror chip 124.Each eyeglass can a pixel of break-make light.Hinge arrangement allows eyeglass to tilt between two states, and+10 degree are " opening ".-10 degree are for " pass ", and when eyeglass was not worked, they were in 0 degree " berthing " state.
According to the needs of using, digit optical processing unit 120 can receive video or the figure signal of numeral or simulation.Processor 122 is red, green, blue (RGB) data with video or the image signal processing of numeral or simulation, then the RGB data layout is turned to scale-of-two panel data and write store 123.
Scale-of-two panel data in digital micro-mirror chip 124 read memories 123, each pixel of image information directly is mapped on the eyeglass of digital micro-mirror chip 124 according to 1: 1 ratio, thereby can provide exact figure control to digital micro-mirror chip 124.
By the storage unit under each eyeglass of digital micro-mirror chip 124 is carried out addressing with the scale-of-two planed signal, each eyeglass on the digital micro-mirror chip 124 is take the electrostatic means inclination as " opening " or "Off" state, processor 122 can be controlled by pulse-length modulation (PWM) which direction each eyeglass is tilted on and how long keep, and digital micro-mirror chip 124 becomes a controlled optical reflection array thus.From the color sequence of light light beam of shaping lens 114 by direct irradiation at the digital micro-mirror chip surface.
When colour wheel 113 rotation, the color sequence of light light beam of red, green, blue is sequentially penetrated on digital micro-mirror chip 124, when ruddiness is mapped on the digital micro-mirror chip 124, eyeglass tilts to " opening " according to position and the intensity that red information should show, green and blue light and picture signal also are work like this, light beam by 124 reflections of digital micro-mirror chip projects on the screen 20 by projection lens 130, and human vision system is concentrated the red, green, blue information on the screen 20 and seen a full-color image.
Structure and the principle of work of projection arrangement of the present invention have more than been described, the below will on exciting light on colour wheel light spot shape and the impact that luminescence efficiency and the conversion efficiency of colour wheel causes is described in detail.
In projection optical system, for the shape of the hot spot that shines the digital micro-mirror chip surface and size requirement is arranged all.The size of the hot spot of digital micro-mirror chip surface can be controlled by the enlargement factor of projection optical system, and the shape of the hot spot of digital micro-mirror chip surface is then identical with light spot shape on the colour wheel.Therefore light wavelength conversion zone on the colour wheel can not change light spot shape, finally shines light spot shape on the digital micro-mirror chip and excitation source and incides light spot shape almost identical (considering that differing of projection optical system may slightly change) on the colour wheel.Be the utilization ratio of the luminous energy that improves projection optical system, the light spot shape that needs excitation source to produce is complementary with the shape of digital micro-mirror chip, namely requires excitation source to produce the hot spot of trying one's best close to the digital micro-mirror chip form.Because the screen of Projection Display has certain ratio specification, for example 4: 3 or 16: 9, so the digital micro-mirror chip also is that length breadth ratio is 4: 3 or 16: 9 rectangles, this just causes the shape that excites hot spot size on long and wide both direction was different.
Light intensity and hot spot distribution influence are very large because the luminescence efficiency of colour wheel and conversion efficiency are stimulated, and different facula positions and projecting direction can cause different effects to the luminescence efficiency of colour wheel with conversion efficiency.For making those skilled in the art be easier to understand technical scheme of the present invention, the present invention is described with a kind of simple scenario now, namely describe with two formed hot spots of diverse location projection of same projected light beam on annular projection's track of colour wheel, in such cases, shape, size, the light distribution of two hot spots of acquiescence are all identical, need parameter relatively to simplify.It will be appreciated by those skilled in the art that above-mentioned restriction just for technical scheme of the present invention is described, is not for the restriction embodiments of the present invention.
Fig. 3 is the projected position design sketch of hot spot of the present invention on colour wheel.As shown in Figure 3, be provided with twisted rotary shaft 220 on the colour wheel 210 and be the equally distributed fluorescence transition zone 211 of equal angles, 212,213, be provided with different material for transformation of wave length in the light wavelength conversion district 211,212,213, for example (contradiction is explained in front and back for fluorescent material or nano wave length transition material, advise that fluorescence transition zone in front changes the light wavelength conversion district into), can respectively exciting light be converted to the Stimulated Light with the exciting light different wave length.Specifically, take fluorescent material as example, light wavelength conversion district 211 is for being provided with the ruddiness subregion of red light flourescent material, light wavelength conversion district 212 is for being provided with the green glow subregion of green glow fluorescent material, light wavelength conversion district 213 is for being provided with the blue light subregion of blue-light fluorescent material, light wavelength conversion district 211 can be converted to ruddiness with exciting light, and light wavelength conversion district 212 can convert exciting light to green glow, and 213 in light wavelength conversion district converts exciting light to blue light.Therefore, when the light wavelength conversion district 211,212,213 of colour wheel 210 is arranged on the travel path of exciting light under the effect of motor (not shown) or other driving mechanisms in turn, the periodic colorama sequence that colour wheel 210 can outgoing be comprised of ruddiness, green glow, blue light in turn.
The exciting light that the light source (not shown) is sent is focused at through collector lens and forms hot spot 230 or 240 on the colour wheel 210, when rotating shaft 220 drives colour wheels 210 rotation, annular projection's track 214 that hot spot 230 or 240 center form along the circumferential direction at colour wheel 210.Hot spot 230 and two the diverse location projection formed hot spots of hot spot 240 expression same projected light beams on annular projection's track 214 of colour wheel, and hot spot 230 is all identical with 240 shape, size, light distribution, in the present embodiment, hot spot 230 and 240 is rectangular light spot, the length of rectangular light spot is d1, and width is d2.Wherein hot spot 230 is positioned on the radial line of axle center along continuous straight runs of colour wheel, and hot spot 240 is positioned on the axle center radial line vertically of colour wheel.By changing the relative position relation of light source and colour wheel 210, can adjust the projected position of hot spot on colour wheel 210, and the size of the hot spot of different projected positions on annular projection's track 214 is also different.
As shown in Figure 3, the hot spot 230 that the formed projected light beam of the exciting light that light source sends becomes on colour wheel 210 and 240 at the projection size of the radial direction of rotating shaft 220 and circumferencial direction in other words, the projection size of projected light beam on colour wheel 210 annular projection's track 214 along the circumferential direction etc.The projection size of hot spot 230 on the circumferencial direction of projection size hot spot 230 in rotating shaft in the radial direction of rotating shaft wherein, hot spot 240 at the projection size in the radial direction of rotating shaft then less than the projection size on the circumferencial direction of hot spot 230 in rotating shaft.
For the fluorescent powder of some parts on the colour wheel 210, it rotates just to understand in a week and being excited once by hot spot, the time that excites each time, is time of the inswept hot spot of this part fluorescent powder.Hot spot size on annular projection's track 214 along the circumferential direction is longer, and this part fluorescent powder light-struck time that is excited is just longer, and the accumulation of the heat that produces in fluorescent powder inside is just more, and the efficient of fluorescent powder is just lower.As seen, the size of hot spot on annular projection's track 214 along the circumferential direction should be as far as possible little.
Fig. 4 is the time of being excited of facula position on the colour wheel of the present invention and the graph of a relation of sweep time.The exciting light that light source sends incides on the colour wheel 210, and the material for transformation of wave length on the facula position is subjected to incident light to excite the generation exciting light.Because incident light is lasting light, do not rotate such as colour wheel 210, the light of the fluorescence transition zone institute incident that then is stimulated is lasting light, when colour wheel 210 works under the effect of motor or other driving mechanisms, when getting up with fixing rotational speed, then the light of institute's incident is pulse on the facula position.As shown in Figure 4, because the invariablenes turning speed of colour wheel 210, the time of the being excited t of the material for transformation of wave length on the facula position is less with the dutycycle that sweep time, T compared so, and then the heated time of fluorescent powder is shorter, the accumulation of the heat that fluorescent powder inside produces is just fewer, and the fluorescence efficiency of colour wheel 210 is higher.In conjunction with shown in Figure 3, the material for transformation of wave length of facula position is subject to exciting light-struck dutycycle to be: d/2 π r.Wherein, d is the arc length of hot spot on annular projection's track 214, because the corresponding radian of hot spot is very little, so this arc length can be approximately equal to hot spot size on the circumferencial direction of rotating shaft.R is that hot spot is to the distance of colour wheel rotation axis.Wherein, the length d of rectangle 1 is certain value with width d2, and hot spot also is certain value to the rotating shaft 220 of colour wheel 210 apart from r.
Describe take Fig. 5 and Fig. 6 as the fluorescence efficiency of example to different hot spots now.Fig. 5 is along the facula position synoptic diagram of rotating shaft horizontal direction on the colour wheel of the present invention.Fig. 6 is along the facula position synoptic diagram of rotating shaft vertical direction on the colour wheel of the present invention.The size of facula position 330 and facula position 430 is 1.4 millimeters x1.8 millimeters, when the relative position of the light source 350 that the incident exciting light is set and colour wheel 310 so that hot spot 330 when being positioned on the radial line of axle center 320 along continuous straight runs of colour wheel 310, the d1=1.4 millimeter, when the relative position of the light source 450 that the incident exciting light is set and colour wheel 410 so that hot spot 430 when being positioned on axle center 420 radial line vertically of colour wheel 410, the d2=1.8 millimeter, because radius r is certain value, then the dutycycle of facula position 330 and facula position 430 is d1/d2=1.4/1.8=0.78, and then the fluorescence efficiency of facula position 330 is 1.29 times of facula position 430.
Can reach a conclusion thus, the fluorescence efficiency of hot spot is higher in the situation of projection size in the radial direction greater than the projection size on the circumferencial direction of hot spot in described rotating shaft of hot spot in rotating shaft, in other words the fluorescence efficiency of hot spot hot spot the projection size in the radial direction of rotating shaft greater than hot spot with the perpendicular direction of the radial direction of rotating shaft on the situation of projection size under higher.When the design projection light source, by adjusting the relative position of light source and colour wheel, one side so that on the circumferencial direction that drops on the colour wheel rotating shaft that the projection hot spot of incident light is lacked, can improve the fluorescence efficiency of projection light source.
Above-mentionedly only be a preferred implementation of projection light source of the present invention, in the practical application, can adjust as the case may be that still take the colour wheel that moves in a circle as example, when the spot size that is projected on the colour wheel circumferencial direction is larger, then fluorescence efficiency is lower; Spot size on being projected in the colour wheel circumferencial direction greater than colour wheel on during the hot spot projection size of other any directions, hot spot efficient is minimum; So, in order to improve fluorescence efficiency, to accomplish at least to be projected in spot size on the circumferencial direction on the colour wheel and be less than size at least one other direction that is projected on the colour wheel.
Fig. 7 is the synoptic diagram of the various projection of shape of hot spot on the colour wheel of the present invention.Those skilled in the art should know, be subjected to light source and collector lens and with the impact of the relative position relation of colour wheel, the projection of hot spot on colour wheel can comprise various shape, the present invention does not limit this.As shown in Figure 7, the shape of hot spot is the closed figures that is is mutually connected and composed from beginning to end by arc border and/or straight border.The figure that is comprised of the arc border comprises ellipse, fillet polygon, avette, round rectangle, Long Circle etc.; The figure that is comprised of straight border comprises convex polygon, concave polygon, convex polygon such as rectangle, trapezoidal, rhombus, parallelogram, not parallel quadrilateral, pentagon and hexagon etc., concave polygon such as cruciform etc.
With the hot spot of exciting light on colour wheel take oval-shaped as example, when oval-shaped hot spot is projected on disc or the circular colour wheel, when the oval-shaped major axis of hot spot is projected in colour wheel in the radial direction, then oval-shaped minor axis be projected on the colour wheel with the perpendicular direction of motion of radial direction on the time, the dutycycle that the time of being excited of the material for transformation of wave length on the facula position was compared with sweep time is minimum, the heated time of fluorescent powder is short, the accumulation of the heat that fluorescent powder inside produces is just few, and the fluorescence efficiency of colour wheel is high.
Fig. 8 is the structural representation of the another kind of embodiment of projection light source in the projection arrangement of the present invention.In the present embodiment, projection light source 500 comprises light source 550, colour wheel 510 and motor (not shown).In the present embodiment, by the exiting surface at light source 550 collector lens is set, emergent light directly is focused at and forms hot spot 530 on the colour wheel 510, thereby realizes assembling the function of emergent ray at light source 550.
Fig. 9 is the structural representation of the another kind of embodiment of projection light source in the projection arrangement of the present invention.In the present embodiment, projection light source 600 comprises colour wheel 610, rotating shaft 620, shaping lens 630, anti-green optical filter 641, anti-indigo plant reveal the green optical filter 642, exciting light sources 651, red-light source 652 and the blue light source 653 of being popular in.In the present embodiment, be provided with a kind of material for transformation of wave length on the colour wheel 610, it for example is green light fluorescent powder, the green light fluorescent powder of the exciting light that exciting light sources 651 sends on colour wheel 610 absorbs and is converted to green glow, and be the green glow parallel beam via shaping lens 630 collimation, anti-green optical filter 641 and the anti-indigo plant of being popular in reveals the green on the transmission path that is arranged on the green glow parallel beam that optical filter 642 tilts, the transmission path of the relative green glow parallel beam of the light direction of red-light source 652 vertically arranges, and the ruddiness of 652 outgoing of red-light source transmits along the direction that is parallel to the green glow parallel beam after green optical filter 641 reflects through counter being popular in, similarly, the transmission path of the relative green glow parallel beam of the light direction of blue light source 653 vertically arranges, and the blue light of 653 outgoing of blue light source transmits along the direction that is parallel to the green glow parallel beam after anti-indigo plant reveals the green optical filter 642 reflections.Present embodiment provides exciting light sources to be applied in technical scheme on the colour wheel that comprises the single wavelength transition material, those skilled in the art should know, and the present invention limits kind and the quantity of the material for transformation of wave length that arranges on the colour wheel in the projection light source; For example, establish red light wavelength transition material, green wavelength transition material, blue light wavelength transition material on the colour wheel, be incident upon by exciting light and be inspired successively ruddiness, green glow and blue light on the colour wheel, send white light behind the above-mentioned three coloured light mixed lights.Exciting light is incident upon the light spot shape on the single colour wheel, is less than size at least one other direction that is projected on the colour wheel as long as meet spot size on the circumferencial direction that hot spot is projected in colour wheel, just can improve the fluorescence efficiency of colour wheel.
Colour wheel in the aforementioned embodiments is circle or annular, moves around center circumferential under the driving of driving mechanism.Difference and aforementioned embodiments, colour wheel can also be made the rectangle in the driving lower linear motion of driving mechanism.In this case, the stroke of supposing colour wheel is L, and the projection size of hot spot on direction of motion is d, and the material for transformation of wave length of facula position is subject to exciting light-struck dutycycle to be: d/L; Dutycycle is less, and then the heated time of fluorescent powder is shorter, and the accumulation of the heat that fluorescent powder inside produces is just fewer, and the efficient of fluorescent powder is just higher.The spot size that namely is incident upon on the colour wheel direction of motion is less, and the fluorescence efficiency of colour wheel is higher; So, on the plane at hot spot place, the size of hot spot on direction of motion that is projected on the colour wheel just can improve the fluorescence efficiency of colour wheel less than the size that is projected at least one other direction, such as be projected in hot spot on the colour wheel in the size on the direction of motion less than the size that is projected on the direction vertical with direction of motion; When be projected in hot spot on the colour wheel in the size on the direction of motion less than being projected in other any projection sizes that are different from the hot spot on the direction of motion on the colour wheel, the fluorescence efficiency of colour wheel is the highest.
Concerning colour wheel be circular or discoidal embodiment, colour wheel is circular motion under the driving of drive unit, the colour wheel vertical diameter to circumferencial direction be its direction of motion; So also can be summarized as, on the plane at hot spot place, the hot spot that is projected on the colour wheel just can improve the fluorescence efficiency of colour wheel in the size on the direction of motion less than the size that is projected at least one other direction, as be projected in hot spot on the colour wheel in the size on the direction of motion less than the size that is projected on the direction vertical with direction of motion; When be projected in hot spot on the colour wheel in the size on the direction of motion less than being projected in other any projection sizes that are different from the hot spot on the direction of motion on the colour wheel, the fluorescence efficiency of colour wheel is the highest.
Comprehensive colour wheel circular motion and linear movement, on the plane at hot spot place, be projected in hot spot on the colour wheel in the size on the direction of motion less than the fluorescence efficiency that is projected in size at least one other direction and just can improves colour wheel; When be projected in hot spot on the colour wheel in the size on the direction of motion less than being projected in other any projection sizes that are different from the hot spot on the direction of motion on the colour wheel, the fluorescence efficiency of colour wheel is the highest.
In the above-described embodiments, compared with prior art, projection light source of the present invention is incident upon facula position and direction on the colour wheel by adjusting exciting light, make the hot spot that is projected on the colour wheel in the size on the direction of motion less than the size that is projected at least one other direction; Hot spot is diminished at the projection size of direction of motion, this part fluorescent powder light-struck time that is excited shortens, can reduce the dutycycle that fluorescent powder is excited, thereby improve the fluorescence efficiency of colour wheel, and reduced the temperature of spot area on the colour wheel, improve the output optical efficiency of projection light source, keep the colour temperature of output beam, the stability of colourity.
The above only is embodiments of the invention; be not so restriction protection scope of the present invention; every equivalent structure or equivalent flow process conversion that utilizes instructions of the present invention and accompanying drawing content to do; or directly or indirectly be used in other relevant technical fields, all in like manner be included in the scope of patent protection of the present invention.
Claims (12)
1. projection light source comprises:
Excitation source is for generation of exciting light; And
But the colour wheel of periodic motion comprises at least one light wavelength conversion zone, described light wavelength conversion region division on the travel path of described exciting light to receive described exciting light and then to be converted to and stimulated luminescence that this light wavelength conversion zone is corresponding;
It is characterized in that, during described colour wheel periodic motion, the exciting light that described excitation source produces forms hot spot at described colour wheel, and described hot spot is projected in projection size at least one other direction on the colour wheel at the projection size on the colour wheel direction of motion less than hot spot.
2. projection light source according to claim 1 is characterized in that, described hot spot the projection size on the colour wheel direction of motion less than with hot spot be projected on the colour wheel with the perpendicular direction of colour wheel direction of motion on projection size.
3. projection light source according to claim 1 is characterized in that, described hot spot is projected in projection size on other any directions on the colour wheel at the projection size on the colour wheel direction of motion less than described hot spot.
4. projection light source according to claim 1 is characterized in that, described light wavelength conversion district inclusion fluorescent powder, quantum dot or fluorescent dye, or its mixing.
5. projection light source according to claim 1 is characterized in that, the shape of described hot spot is the closed figures that is is mutually connected and composed from beginning to end by arc border and/or straight border.
6. projection light source according to claim 5 is characterized in that, the shape of described hot spot comprises convex polygon, concave polygon, ellipse, fillet polygon, one of avette.
7. projection light source according to claim 6 is characterized in that, described convex polygon comprise rectangle, trapezoidal, rhombus, parallelogram, not parallel quadrilateral, pentagon and hexagon it
8. projection light source according to claim 1 is characterized in that, but described colour wheel is circle or the annular of circular motion.
9. projection light source according to claim 8 is characterized in that, described hot spot be shaped as ellipse, oval-shaped major axis is projected in colour wheel in the radial direction, oval-shaped minor axis is projected on the direction of motion of vertical colour wheel radial direction.
10. projection light source according to claim 8 is characterized in that, described hot spot be shaped as rectangle, rectangular long limit is projected in colour wheel in the radial direction, rectangular broadside is projected on the direction of motion of vertical colour wheel radial direction.
11. projection light source according to claim 8 is characterized in that, described projection light source also comprises:
Motor connects described rotating shaft, is used for driving described colour wheel and rotates around described rotating shaft.
12. projection arrangement, it is characterized in that, described projection arrangement comprises the digit optical processing unit, projection lens and each described projection light source in 10 according to claim 1, described projection light source produces the color sequence of light of periodic timing, and described color sequence of light projected described digit optical processing unit, described digit optical processing unit receives the picture signal of being inputted described projector by the outside, described picture signal is treated to the switch controlling signal of the binary data corresponding with described color sequence of light, described digit optical processing unit further comprises array of reflective micro-mirrors, described switch controlling signal is controlled described array of reflective micro-mirrors the described color sequence of light of described projection light source projection is reflected, comprise the projection ray of image information with formation, described projection lens projects to described projection ray to form on the screen and shows image.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201110329788.7A CN103076712B (en) | 2011-10-26 | 2011-10-26 | Projection light source and projection device using same |
| CN201510256051.5A CN104865784B (en) | 2011-10-26 | 2011-10-26 | Projection light source and projector employing same |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201110329788.7A CN103076712B (en) | 2011-10-26 | 2011-10-26 | Projection light source and projection device using same |
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| CN201510256051.5A Division CN104865784B (en) | 2011-10-26 | 2011-10-26 | Projection light source and projector employing same |
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| CN103076712B CN103076712B (en) | 2015-05-27 |
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| CN201110329788.7A Active CN103076712B (en) | 2011-10-26 | 2011-10-26 | Projection light source and projection device using same |
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Also Published As
| Publication number | Publication date |
|---|---|
| CN104865784A (en) | 2015-08-26 |
| CN103076712B (en) | 2015-05-27 |
| CN104865784B (en) | 2017-01-18 |
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Address after: 518000 20-22, 20-22 headquarters building, 63 high tech Zone, Xuefu Road, Nanshan District, Guangdong Province, Guangdong. Patentee after: Shenzhen Guangfeng Polytron Technologies Inc Address before: 518000 3rd floor Fangda Building, Nanshan Science Park, Shenzhen, Guangdong Province Patentee before: Shenzhen Appotronics Co., Ltd. |