CN103292254A - Light source - Google Patents
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- CN103292254A CN103292254A CN2013101314622A CN201310131462A CN103292254A CN 103292254 A CN103292254 A CN 103292254A CN 2013101314622 A CN2013101314622 A CN 2013101314622A CN 201310131462 A CN201310131462 A CN 201310131462A CN 103292254 A CN103292254 A CN 103292254A
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Abstract
The invention provides a light source which comprises an excitation light source for providing exciting light, and an optical wavelength conversion component away from the excitation light source, wherein the optical wavelength conversion component comprises an optical wavelength conversion material for converting the exciting light into stimulated luminescence, a light guiding component for directing the exciting light to enter into the optical wavelength conversion material, and a light collecting component for collecting the stimulated luminescence from the optical wavelength conversion material. In order to distinguish the light path of the stimulated luminescence from that of the exciting light, the optical extend of the light guiding component is less than or equal to 1/4 that of the light collecting component, so that the light guiding component is utilized for bringing in the exciting light and preventing the stimulated luminescence from excessively escaping through the light guiding component. The light source provided by the invention can distinguish the light path of the exciting light from that of the stimulated luminescence, and has the advantages of simple light paths and easiness in processing and realization of optical components.
Description
Technical field
The present invention is the dividing an application for the patent application of " light source " that 201110403775.X, the applying date be on December 7th, 2011, denomination of invention for application number.The present invention relates to light source, relate in particular to the light source based on light wavelength conversion.
Background technology
Conventional light source such as fluorescent lamp, incandescent lamp, uhp lamp or xenon lamp etc. are difficult to accomplish high efficiency, long-life.Along with the development of solid state light emitter, light emitting diode (LED, Light Emitting Diode) and semiconductor laser progressively enter into illumination and show market.
The mode that produces white light or coloured light generally has two kinds: a kind of is directly to utilize coloured light light source such as red, green or blue-ray LED that coloured light is provided, or utilizes these coloured light to come synthesize white light; Another kind is based on light wavelength conversion and comes the excitation wavelength transition material to produce coloured light with excitation source, and then utilizes exciting light or excite the various coloured light of generation to come synthesize white light.Be that excitation source comes the excitation wavelength transition material with the light source that can produce short wavelength such as blue light or UV light for example, such as but not limited to as fluorescent material.Be example with the green glow, present green light LED or green (light) laser are efficient because being difficult to accomplish, price is very high; Otherwise solid-state devices efficient height and the price of blue light and UV light are low, adopt a kind of scheme in back to produce green glow and have bigger market prospects undoubtedly.
Be example with fluorescent material, tradition is based on the light conversion and adopt the light source of led chip generally fluorescent material to be located at the led chip surface.Its weak point is: when the luminous penetration phosphor layer of partially-excited backscattering returned led chip, because led chip has the certain absorption rate to light, this part stimulated luminescence can be reflected into the emergent light of light source fully, can have certain loss; In addition, exist between the heat that the heat that led chip sends and fluorescent material send to interact, will reduce the luminous efficiency of led chip and the conversion efficiency of fluorescent material, even shorten the life-span of LED device.Therefore, the light source of this class formation is difficult to accomplish high brightness.
US Patent No. 7,070,300B2 adopts a kind of method of separating LED and fluorescent material, specifically as shown in Figure 1 for overcoming above-mentioned defective.To collimate with optical alignment device 108 from the exciting light of one or more led light sources 102, the recycling wavelength is selected sheet 110 that these exciting lights are reflexed to another collimator apparatus 114 and is focused on the back projection toward phosphor sheet 112, is provided as the emergent light of light source from the described wavelength selection sheet 110 of the stimulated luminescence transmission of this phosphor sheet 112.In this scheme, stimulated luminescence can retroeflection not arrive led chip, and the heat that the heat that led chip produces and fluorescent material produce can not interact.And the light path differentiation effect that wavelength selects 110 pairs of exciting lights of sheet and stimulated luminescence to play helps the extraction of stimulated luminescence, and it is recycling that the stimulated luminescence of most backscatterings or exciting light are obtained, and can solve the existing problem of above-mentioned conventional art substantially.But also there is its weak point in this scheme: generally be square or rectangle based on existing led chip, its emergent light is lambertian distribution, and the optics module that the energy high efficiency is collected and collimated from the light of this led chip is difficult to be designed and make; This or also be that this invention product is not seen a business-like major reason so far.In addition, because wavelength is selected the light splitting of sheet 110, exciting light fails to be provided as the emergent light of light source, when selecting blue-ray LED to be excitation source, being example, light source is if need the blue light composition to need to such an extent that add one group of blue-ray LED again and colimated light system closes light, certainly will increase the light source cost and strengthen volume and the structure complexity of light source.
Summary of the invention
The technical problem to be solved in the present invention is at above-mentioned the deficiencies in the prior art part, and proposes a kind of light source, realizes separating of excitation source and optical wavelength conversion material with simple light path and structure.
For solving the problems of the technologies described above, of the present inventionly be contemplated that substantially: in separate excitation sources and optical wavelength conversion material, the situation that should allow stimulated luminescence to be extracted separately exists, to allow that also the situation that stimulated luminescence and the exciting light that is not absorbed and used are extracted simultaneously exists, for this reason when saving the accounting for body space and consider to make exciting light and stimulated luminescence common optical pathways of light source, be also noted that the loss that the introducing device of avoiding introducing exciting light causes stimulated luminescence reflection or transmission; The present invention notices that the stimulated luminescence of optical wavelength conversion material has the characteristics of approximate lambertian distribution, its corresponding light collecting device should have bigger light blood propagation, and the excitation beam of incident simultaneously preferably has the light conversion efficiency that less optical extend improves optical wavelength conversion material, thereby the present invention expects reducing by the optical extend that limits described introducing device this introducing device to the influence of stimulated luminescence, namely, can utilize the difference of optical extend of the stimulated luminescence of the optical extend of incident light source and optical wavelength conversion material that the input path of exciting light is incorporated in the emitting light path of stimulated luminescence, reduce the loss that this introducing causes unabsorbed stimulated luminescence simultaneously, reach like this when distinguishing stimulated luminescence and exciting light light path, be convenient to simplify the structure of light source.
As the technical scheme that realizes the present invention's design be, a kind of light source is provided, comprise the excitation source that is used to provide exciting light, away from the light wavelength conversion parts of excitation source, these light wavelength conversion parts comprise exciting light is converted to the optical wavelength conversion material of stimulated luminescence; Also comprise directs excitation light and incide light guide member on the optical wavelength conversion material and the light collecting part that is used for collecting the stimulated luminescence that is derived from optical wavelength conversion material; Especially, in order to distinguish the light path of stimulated luminescence and exciting light, the optical extend of described smooth guide member little or equal described smooth collecting part optical extend 1/4, excessively escape thereby avoid stimulated luminescence to pass through this light guide member when utilizing this light guide member to introduce exciting light.
As the technical scheme that realizes the present invention's design still, provide a kind of light source, comprise the excitation source that is used to provide exciting light, away from the optical wavelength conversion material of excitation source, this optical wavelength conversion material is used for converting exciting light to stimulated luminescence; Also comprise guiding and separating the light conduction device of exciting light input path and stimulated luminescence emitting light path, especially, in order to distinguish the light path of stimulated luminescence and exciting light, the optical extend that described smooth conduction device conduction exciting light has is little or equal 1/4 of optical extend that this light conduction device conduction stimulated luminescence has.
Adopt above-mentioned each technical scheme, have that light path is simple, optics is easy to process realizations, practical advantage, be convenient to simultaneously according to the emergent light wave-length coverage of the lighting demand accommodation light source of system and needn't be to the bigger change of light-source structure do.
Description of drawings
Fig. 1 has illustrated the existing structure that produces the light source of efficient coloured light based on LED and fluorescent material;
Fig. 2 embodiment has illustrated light source of the present invention to distinguish the structure of light path with the light collecting part of logical light mouth;
Fig. 3 embodiment has illustrated that the present invention is the light-source structure of light guide member with the reflecting surface in the stimulated luminescence light path;
Fig. 4 has illustrated a kind of structure of using ellipsoid shape reflector of light source of the present invention;
Fig. 5 illustrated light source of the present invention a kind of use hemispherical reflector structure;
Fig. 6 has illustrated the alternative embodiment of Fig. 5 embodiment;
Fig. 7 has illustrated the alternative embodiment of Fig. 4 embodiment;
Fig. 8 has illustrated one of improvement embodiment of Fig. 4 embodiment;
Fig. 9 has illustrated one of improvement embodiment of Fig. 5 embodiment;
Figure 10 illustrated Fig. 4 embodiment improvement embodiment two;
Figure 11 illustrated Fig. 5 embodiment improvement embodiment two;
Figure 12 has illustrated that the excitation light spot size is to the influence curve of collection efficiency among the present invention;
Figure 13 has illustrated the alternative embodiment of Fig. 4 embodiment;
Figure 14 has illustrated the alternative embodiment of Fig. 4 embodiment.
The specific embodiment
Below, the most preferred embodiment shown in is further set forth the present invention by reference to the accompanying drawings.
The prerequisite of using the present invention to distinguish the method for exciting light light path and stimulated luminescence light path is that light source should comprise that optical wavelength conversion material and is used to provide the excitation source of exciting light.On this basis, the emergent light that the light collecting part collects and guide the stimulated luminescence that is derived from optical wavelength conversion material or the unabsorbed exciting light of part to be provided as light source is set; Limit the optical extend of described excitation source little or equal described smooth collecting part optical extend 1/4; The suitable light guide member of optical extend of one optical extend and described excitation source is set, the emitting light path of the stimulated luminescence that the described smooth collecting part of piggybacking guides, from the exciting light injection of excitation source to optical wavelength conversion material.
Wherein, optical wavelength conversion material comprises fluorescent material, nano luminescent material or luminescent dye, can combine by one or more transparent material, so that light source has the stable light characteristic that goes out.With but to be not limited to fluorescent material be example, transparent material can be transparent colloid (such as but not limited to silica gel) or transparent glass material, mixes with fluorescent material or fuses moulding; Also can be transparent thin-film material, with fluorescent material hot pressing on this transparent plastic film material; At last by the member of being arranged to be scheduled to the form of coating or pad pasting, for example light wavelength conversion parts.For having the moistureproof fluorescent material that requires, can also come the described fluorescent material of clamping with above-mentioned any transparent material of mentioning, and can further seal.For strengthening optical wavelength conversion material to the scattering process of incident light and improving optical wavelength conversion material to the absorptivity of exciting light, can also in optical wavelength conversion material, mix scattering material, such as but not limited to titan oxide particles or alumina particle.
Described excitation source can be Sony ericsson mobile comm ab, such as but not limited to LED or the semiconductor laser of sending out short-wavelength light such as UV or blue light.When exciting light was blue light, material for transformation of wave length can be for being respectively applied to blue light is converted to ruddiness, green glow, the gold-tinted fluorescent material of ruddiness, green glow, gold-tinted.What deserves to be explained is herein, when material for transformation of wave length comprises when this blue light is converted to the gold-tinted fluorescent material of gold-tinted, more material for transformation of wave length can be set, make the light from material for transformation of wave length comprise yellow stimulated luminescence and the blue excitation light that is not absorbed by material for transformation of wave length, thus the white light that light source can outgoing be made up of yellow stimulated luminescence and blue excitation light.
The present invention is the structure that example is set forth light source with Fig. 2 earlier.Light source of the present invention comprises the excitation source 110 that is used to provide exciting light at least, and away from the light wavelength conversion parts of excitation source, these light wavelength conversion parts comprise exciting light is converted to the optical wavelength conversion material 150 of stimulated luminescence.Light source of the present invention also comprises directs excitation light and incides light guide member (for example light hole on the reflecting piece 130A) on the optical wavelength conversion material and the light collecting part (for example set of lenses 330 and reflecting piece 130A) that is used for collecting the stimulated luminescence that is derived from optical wavelength conversion material.In different embodiment, described smooth guide member or light collecting part can have multiple different way of realization; But in order to distinguish the light path of stimulated luminescence and exciting light, the optical extend of described smooth guide member should be little or equal the light collecting part optical extend 1/4, excessively escape thereby avoid stimulated luminescence to pass through this light guide member when utilizing this light guide member to introduce exciting light.
In optics, optical extend (Etendue) is used to describe distribution area and the angle of light in the space.Optical wavelength conversion material can enlarge optical extend; In the embodiment of Fig. 2, after the light hole direct projection was to the optical wavelength conversion material 150, the stimulated luminescence that sends from this optical wavelength conversion material was approximate lambertian distribution from the exciting light of excitation source 110, and it is big a lot of that optical extend becomes.To the stimulated luminescence of the positive outgoing of gathering system with do not shot to reflecting piece 130 through the collection of collimation lens set 330 with the form of nearly directional light by exciting light that optical wavelength conversion material absorbed, and then most of be utilized effectively by reflecting piece 130A reflection back output with holes, fraction will spill from the hole and be depleted.Because the optical extend of the exciting light that sends of light source 110 is less, size that can control hole accounts for the very small scale of whole smooth collecting part; And the optical extend of the stimulated luminescence of collecting through collimation lens set 330 is bigger, so the ratio that can control light leakage loss from the hole is in a tolerance interval.The area that this hole projects to set of lenses 330 in the practicality equals 1/4 of the own area of set of lenses for a short time and can be accepted by light source.
Be example with Fig. 2, if the light wavelength conversion parts also comprise the substrate (such as but not limited to heat sink 151) with reflective surface, optical wavelength conversion material is arranged on this reflective surface, optical wavelength conversion material is between this reflective surface and set of lenses 330, the stimulated luminescence that will be conducive to two-sided outgoing is collected by 330 of set of lenses fully by being reflected into one side, and then improves the light service efficiency of light source.If the light wavelength conversion parts comprise that also one is close to described heat sink heat abstractor 152, will help the heat radiation by optical wavelength conversion material and then light conversion efficiency is kept.If described light wavelength conversion parts 150～152 are configured to removable or rotation, more help described heat radiation undoubtedly.
Light source among Fig. 2 further comprises between excitation source 110 and described smooth guide member (light hole) spares the dodging device of light and shaping to exciting light, such as but not limited to exciting light being made into the fly eye lens array 120 that length-width ratio is the rectangle of 4:3.According to the different user demands of projecting apparatus, stage lighting, TV or searchlight, described dodging device can also adopt other lens arra, or adopts hollow or solid lamp guide, even adopts scattering sheet.
Optical filter, brightness enhancement sheet or reflection of polarization sheet also can further be used in the light source of the present invention, with its light inlet place or light-emitting window place that is arranged on the light collecting part, perhaps are close to described optical wavelength conversion material and arrange to obtain certain effects.Can be used for adjusting the spectrum of light source emergent light as the optical filter 180 that is placed on the light-emitting window place among Fig. 2: when selecting this optical filter 180 to have the characteristic of reflection exciting light and transmission stimulated luminescence, light source can provide the stimulated luminescence output of pure color, the exciting light that is not absorbed and used simultaneously carries out secondary or recycled for multiple times through reflecting piece 130A reflected light material for transformation of wave length 150, is conducive to improve the excitation of light.The film 170 that is arranged on the optical filter 180 can be brightness enhancement film or diffraction optics film; Perhaps directly use brightness enhancement sheet or reflection of polarization sheet to replace film 170 and optical filter 180, thereby improve the brightness of light source emergent light or produce the polarization emergent light.Because of these optical filters, brightness enhancement sheet or reflection of polarization sheet and act as prior art, the present invention repeats no more; It is pointed out that these film/sheets also can be placed on the especially surface of optical wavelength conversion material of wavelength converting member.Be example with the optical filter, described optical filter between the exciting light that is introduced into and optical wavelength conversion material can be made of multilayer dielectric film, to have predetermined light transmission features: be the exciting light of 0～15 degree such as but not limited to transmissive stimulated luminescence and incidence angle, being reflected into firing angle simultaneously is the above exciting lights of 15 degree, allow stimulated luminescence pass through selectively like this, allow the low-angle exciting light from excitation source 110 pass through simultaneously, and stop the exciting light of being returned by optical wavelength conversion material 150 scatterings to pass through effectively, thereby effectively improve light source to the service efficiency of exciting light.
In fact the light collecting part among Fig. 2 embodiment or light guide member can be replaced with different combinations by various device.Light-source structure under the present invention design can be specifically: the stimulated luminescence of being collected by described smooth collecting part penetrates light source by an emitting light path; Described smooth guide member is second light reflecting device that is arranged in the described emitting light path, and the light reflection surface of this second light reflecting device is the past optical wavelength conversion material of exciting light reflection from excitation source; The area of the outgoing hot spot of stimulated luminescence is more than 4 times or 4 times of the projected area of this second light reflecting device on described outgoing hot spot.Be representative with Fig. 3, light source comprises excitation source 110 at least, outside the light wavelength conversion parts (comprising optical wavelength conversion material 150 at least) away from excitation source, also comprise at least with set of lenses 330 being the light collecting part of example and being second light reflecting device of example with reflecting piece 130B.Toward optical wavelength conversion material 150, the stimulated luminescence of two-sided outgoing penetrates with nearly directional light after the collection of the reflection of light wavelength conversion parts and set of lenses 330 exciting light of incident by reflecting piece 130B reflection.The relative set of lenses of the size of control reflecting piece 130B 330 is less can control the ratio of stimulated luminescence of outgoing of being failed by this reflecting piece 130B reflection.From practical standpoint, the area that reflecting piece 130B projects to set of lenses 330 equal for a short time set of lenses 330 area 1/4 be can be received.
The placement angle of illustrated reflecting piece 130B makes incident light become 90 degree with emergent light, and in fact described radiation angle can be other angles that make incident light and radiative angle not become 90 degree to intersect.The shape of reflecting piece 130B can be circle, ellipse or rectangle, or even irregularly shaped.In addition, plane reflecting piece 130B can also or have the replacement that amorphous body is equal to of reflective surface by the camber reflection light microscopic, and the shape of curved surface can be sphere, ellipsoid, parabola or free form surface etc.Further, reflecting piece 130B replaces reducing the stimulated luminescence loss that introducing reflecting piece 130B causes with the optical filtering reflector plate of transmissive stimulated luminescence and reflection exciting light.
Correspondingly, be that the light collecting part of example can be equal to replacement with other imaging or non-image device and combination thereof with set of lenses 330, for example adopt lens, hollow light guiding rod, solid lamp guide, Hollow Compound type concentrator, solid composite type concentrator, the plane of reflection or reflecting curved surface and combination thereof: specifically have and realized the taper square rod commercially produced, or be disclosed in US Patent No. 3,923,381 hollow or solid composite type concentrator.These devices and use thereof are mature technique, and the present invention does not give unnecessary details at this.
It can be plane mirror or curved reflector that the embodiment of complex chart 2 and Fig. 3, photoconduction draw parts, or is the light hole on the described smooth collecting part, and the shape of light hole depends on the light spot shape of incident exciting light.Therefore, the light-source structure under the present invention design can also specifically describe and be: the light collecting part comprises changing first light reflecting device of the projecting direction of stimulated luminescence; The light guide member is the Tong Guangkou that is arranged on this first light reflecting device, is injected toward optical wavelength conversion material by this logical light mouth from the exciting light of excitation source; The area of described logical light mouth little or equal this first light reflecting device the reflective surface area 1/4.Fig. 2 embodiment meets one of representative of this description scheme: described first light reflecting device comprises the reflective surface that has described logical light mouth, for example has the reflecting piece 130A of logical light mouth among this figure.If be covered with the deielectric-coating of transmission exciting light and reflection stimulated luminescence at described logical light mouth then be conducive to reduce the stimulated luminescence proportion of goods damageds of this light-source structure.
Except Fig. 2 embodiment, the embodiment that meets this description scheme can also list more.The present invention will be with Fig. 4～11 explanation one by one.To have the parts of same numeral in Fig. 4～11 with the various embodiments described above, if because of its effect in Fig. 4～11 and suitable in the various embodiments described above, then perhaps will these parts not elaborated in addition.
First light reflecting device in this description scheme has light reflection surface inwardly if be designed to be semielliptical shape or hemispherical, and then light source of the present invention will have higher efficient and compact structure more.Be example with Fig. 4 and Fig. 7, when this first light reflecting device was the semielliptical shape, the light inlet of light collecting part was set to show greatly centered by the focus of this first light reflecting device; The placement of light wavelength conversion parts makes another focus place that is subjected to luminous point roughly to be in this first light reflecting device of optical wavelength conversion material locate.Be example with Fig. 5 and Fig. 6, when this first light reflecting device when being hemispherical, the light inlet of light collecting part is arranged to close on the centre of sphere of this first light reflecting device; The placement of light wavelength conversion parts make optical wavelength conversion material to be subjected to luminous point roughly to be in described centre of sphere place relative across optical wavelength conversion material with described light inlet.
Concrete Fig. 4 embodiment that sets forth: light source comprises excitation source 110 and light wavelength conversion parts (comprising optical wavelength conversion material 150 at least).First light reflecting device is example with the semielliptical shape reflector 140 of interior hollow structure, inwall plating reflectance coating, and logical light mouth is the opening on these semielliptical shape reflector 140 reflecting walls.Described reflectance coating is metal film or the deielectric-coating of reflection exciting light and stimulated luminescence.In this embodiment, the light collecting part comprises taper square rod 160 and described semielliptical shape reflector 140, and the light inlet of taper square rod 160 is set to show greatly centered by the focus of semielliptical shape reflector 140.With aforementioned each embodiment, the light wavelength conversion parts comprise optical wavelength conversion material 150, comprise also that preferably a surface is coated with the substrate (such as but not limited to heat sink 151) of reflectance coating or band reflective surface, optical wavelength conversion material is arranged on heat sink 151 the reflective surface or reflectance coating, and it is relative with the light reflection surface of reflector 140, be optical wavelength conversion material between heat sink 151 reflective surface and reflector 140, help to make the stimulated luminescence of two-sided emission on the optical wavelength conversion material 150 by penetrating with one side; Being adjacent to described heat sink 151 establishes heat abstractor 152 and helps optical wavelength conversion material heat radiation.The placement of light wavelength conversion parts makes another focus place that is subjected to luminous point roughly to be in this first light reflecting device of optical wavelength conversion material 150 locate.Dodging device comprises outside the lens arra 120 in the previous embodiment, also comprises a collector lens 130 that is used for exciting light is converged to described another focus place; Suppose that this dodging device evenly is shaped to the rectangle that length-width ratio is 4:3 to launching spot.Then a rectangular light spot is incident upon described another focus place of semielliptical shape reflector 140 from the exciting light of excitation source 110 after through dodging device and logical light mouth, this semielliptical shape reflector 140 and then will reflex to the light inlet that is positioned near the described taper square rod 160 the focus from the stimulated luminescence of optical wavelength conversion material 150 and unabsorbed exciting light, by the light that closes of collecting to provide uniform stimulated luminescence and exciting light of taper square rod 160, closing the light hot spot is rectangle.Can be placed on described light inlet place with optical filter 180, adjust the spectrum of emergent light, to improve the excitation of emergent light.The bore of the logical light mouth of control is to reduce stimulated luminescence or the key of the light leak of the exciting light that is not absorbed and used among this embodiment.After tested, the radius of this logical light mouth is 20% o'clock of radius of semimajor axis of ellipsoid, and the stimulated luminescence of missing roughly accounts for and always sends 4% of stimulated luminescence.Therefore the radius control that preferably will lead to the light mouth in the practicality is being less than or equal to 1/2 of semimajor axis of ellipsoid.
Fig. 7 example structure is substantially close to Fig. 4 structure.Different is, first light reflecting device is example with the solid semielliptical shape transparent body 420 that positive camber is coated with reflectance coating 421 in Fig. 7, and logical light mouth is a breach 422 of described reflectance coating.Described reflectance coating 421 is similarly metal film or the deielectric-coating of reflection exciting light and stimulated luminescence.In Fig. 7 embodiment, the disappearance of optical filter 180 makes light source export the light that closes of stimulated luminescence and exciting light.Different with Fig. 4 embodiment a bit is in addition: among Fig. 7 embodiment, can arrange to make and have a thickness between the optical wavelength conversion material that is subjected to the luminous point place and the described transparent body less than 1% air-gap of semielliptical major semiaxis, this air-gap helps to improve light output brightness.
In above-mentioned Fig. 4 or 7 embodiment, logical light mouth can consider to be set to the eccentric orfice of described semielliptical shape first light reflecting device, namely determine to make Tong Guangkou to depart from described arcuation top one preset distance according to the position of the focus at described optical wavelength conversion material place, so that the collimated light beam of exciting light impinges perpendicularly on optical wavelength conversion material.Like this, when optical wavelength conversion material 150 comes off from heat sink 151 the reflecting surface accidentally, the exciting light of vertical incidence can be returned outside semielliptical shape first light reflecting device by vertical reflection, thereby has avoided high brightness exciting light (when especially adopting semiconductor laser the to be excitation source) reflection by semielliptical shape first light reflecting device by the 160 collected ejaculations of taper square rod and may damage human eye vision.
Concrete Fig. 5 embodiment that sets forth: light source comprises excitation source 110 and light wavelength conversion parts (comprising optical wavelength conversion material 220 at least).First light reflecting device is example with the hemispherical reflector 240 of interior hollow structure, inwall plating reflectance coating, and logical light mouth is the opening on these hemispherical reflector 240 reflecting walls.Described reflectance coating is metal film or the deielectric-coating of reflection exciting light and stimulated luminescence.In this embodiment, the light collecting part comprises taper square rod 160 and described hemispherical reflector 240, and the light inlet of taper square rod 160 is arranged to close on the centre of sphere of this hemispherical reflector 240.The light wavelength conversion parts comprise that also one is used for carrying the transparent substrates 210 of optical wavelength conversion material 220, the placement of these light wavelength conversion parts make optical wavelength conversion material 220 to be subjected to luminous point roughly to be in described centre of sphere place relative across optical wavelength conversion material 220 with described light inlet.Optical wavelength conversion material 220 is applied to described transparent substrates 210 towards the one side of taper square rod 160 among this figure, and in fact this optical wavelength conversion material 220 also can be applied to transparent substrates 210 towards the one side of hemispherical reflector 240.Perhaps can also have certain mechanical strength and can not rely on substrate and self-existent light wavelength conversion parts making after the mixing such as encapsulating materials such as optical wavelength conversion material 220 and glass, pottery, to omit transparent substrates 210, will be conducive to being extracted of stimulated luminescence.
The collector lens 130 of dodging device is used for exciting light is converged near the described centre of sphere.The length-width ratio rectangular light spot that is 4:3 is projected near the described centre of sphere after through dodging device and logical light mouth from the exciting light of excitation source 110, stimulated luminescence is in the two-sided formation lambertian distribution of light wavelength conversion parts, wherein forward light is directly collected by taper square rod 160, the back reflects back into optical wavelength conversion material 220 to light through hemispherical reflector 240, because optical wavelength conversion material is very little to self radiative absorption, the stimulated luminescence that this part is reflected back to optical wavelength conversion material 220 will penetrate behind the optical wavelength conversion material collected by taper square rod 160 effectively; This hemispherical reflector 240 also can carry out secondary or recycled for multiple times to the scattering exciting light reflected light material for transformation of wave length 220 that is not absorbed and used simultaneously, thereby has improved the utilization rate of exciting light.Light source can provide the light that closes of stimulated luminescence and exciting light by the collection of taper square rod 160.Can adjust spectrum or the angle of emergent light equally with the optical filter 180 that is placed on these taper square rod 160 light inlet places or blast sheet 170, repeat no more.Similar with the embodiment of Fig. 4 or Fig. 7, the bore of the logical light mouth of control is the key that reduces the stimulated luminescence light leak, and the radius control that preferably will lead to the light mouth in the practicality is being less than or equal to 1/2 of hemisphere radius.
Fig. 6 embodiment is substantially close to Fig. 5 structure.Different is, first light reflecting device is example with the solid hemispherical transparent body 320 that positive camber is coated with reflectance coating 321 in Fig. 6, and logical light mouth is a breach 322 of described reflectance coating.Described reflectance coating 321 is similarly metal film or the deielectric-coating of reflection exciting light and stimulated luminescence.In addition, the light wavelength conversion parts can only comprise to apply or the pad pasting form be arranged on the hemispherical transparent body 320 optical wavelength conversion material 310(and with mixture such as silica gel, the scattering material etc. of its doping).Also have a bit different with Fig. 5 embodiment can be: among Fig. 6 embodiment, can arrange to make and have a thickness between the optical wavelength conversion material 310 that is subjected to the luminous point place and the described transparent body 320 less than 1% air-gap of hemisphere radius, to help improving the light conversion ratio and improving light output intensity.In addition, for the diversity of light collecting part implementation is described, replace taper square rod 160 among Fig. 5 embodiment with lens or set of lenses 330 in the present embodiment.Optical filter 180 between optical wavelength conversion material 310 and set of lenses 330 or brightness enhancement film 170 or polarised light selection sheet etc. can be used for changing the characteristic of emergent light equally.
The transparent body among above-mentioned Fig. 6 or Fig. 7 embodiment can be transparent glass or plastics.Described logical light mouth 322 or 422 places can be coated with the deielectric-coating of transmission exciting light and reflection stimulated luminescence, to reduce the loss that logical light mouth causes stimulated luminescence.
In Fig. 5 or Fig. 6 embodiment, described logical light mouth can roughly be arranged on the arcuation top of semielliptical shape or hemispherical first light reflecting device, so as from the exciting light of excitation source roughly direct projection toward optical wavelength conversion material.In addition, in order to reduce the loss that logical light mouth causes stimulated luminescence, can also one filter part be set at this logical light mouth place, make the curvature on the arcuation surface that this filter part has consistent in the curvature at this logical light mouth place with described first light reflecting device, make to be plated in to be used for transmission exciting light and the deielectric-coating of reflection stimulated luminescence and the light reflection surface of described light reflecting device on this arcuation surface and smoothly to be spliced into one.Light source as shown in Figure 8 increases filter part on the light source basis of Fig. 4 structure, such as but not limited to bloomed lens 510 as shown in the figure.The left side curvature of this bloomed lens 510 and semielliptical shape reflector 140 are identical and be coated with the described deielectric-coating that is used for transmission exciting light and reflection stimulated luminescence; The right side can be designed to have certain shape, converges on the optical wavelength conversion material 150 with the exciting light with incident such as but not limited to protruding shape.The light source of Fig. 9 signal then is to increase the bloomed lens 610 of filling light hole on the light source basis of Fig. 5 structure, this bloomed lens 610 have with Fig. 8 in bloomed lens 510 similar structure and effects, thereby detailed description no longer.Described bloomed lens 610 or 510 can also be replaced with the optical filtering knee-piece, and described optical filtering knee-piece is designed to have the characteristic of transmission exciting light and reflection stimulated luminescence.In fact also be one of form of expression of described filter part about the deielectric-coating of mentioning in Fig. 6 or the 7 embodiment discussion that is coated on the logical light mouth 322 or 422.
The present invention can also improve the embodiment of above-mentioned Fig. 2～8 each figure, for example make the light wavelength conversion parts also comprise the movable body of the described optical wavelength conversion material of a carrying, the motion of this movable body makes the range of exposures that the optical wavelength conversion material in the presumptive area enters the exciting light of being introduced by the light guide member by turns, is conducive to like this solve the long-pending heat problem of optical wavelength conversion material and service life of prolonging light source (especially high power light source).Described movable body comprises wheel disc, cylinder or the mobile travelling carriage of rotation; Being used in the described presumptive area carrying the base material of described optical wavelength conversion material or being reflectorized material, perhaps is transparent material.Described base material is have reflective surface heat sink for best, and optical wavelength conversion material is arranged on this reflective surface, and relative with the light collecting part.Figure 10 has illustrated a kind of improvement light source on Fig. 4 architecture basics: be that excitation source is example with the blue light source; The light wavelength conversion parts comprise rotary wheel 710; The material that the circular substrate of optical wavelength conversion material of being used for this wheel 710 carrying adopts for example is not limited to metal or glass, plate reflective membrane in this circular substrate, and then apply one or more optical wavelength conversion material at reflective membrane, these optical wavelength conversion material subregion regular distribution are such as but not limited to as shown in the figure red light fluorescent powder section 714 or green light fluorescent powder section 715, do not contain the reflecting surface section 716 of any fluorescent material.Described reflecting surface can apply barium sulfate or teflon coating.Scattering material can also mix in each described optical wavelength conversion material.In order to design specific light source emergent light, can also be close to described optical wavelength conversion material and between optical wavelength conversion material and light collecting part, optical filter is set, and make the printing opacity wavelength of optical filter different according to the difference of optical wavelength conversion material on the corresponding subregion, for example corresponding with red light fluorescent powder section 714 is Red lightscreening plate 712, be used for the light that red light fluorescent powder sends is filtered, make its color become pure.By that analogy, corresponding with green light fluorescent powder section 715 is green color filter 711, and corresponding with blu-ray reflection face section 716 is blue filter or the two-sided glass 713 that is coated with anti-reflection film.Filter segments 711,712 and 713 and optical wavelength conversion material or scattering material section 714,715 and 716 be assembled together by a motor driven rotary Frequency Synchronization that rotating speed can require with projector.Green color filter 711 and Red lightscreening plate 712 can reflect blue, so arrived optical filter 711 or can be reflected back to fluorescent coating at 712 o'clock by the blue light of green emitting phosphor 715 or red fluorescence powder 714 reflections.Simultaneously, because optical filter 711 and 712 can be got back to material for transformation of wave length by the antireflection part exciting light, and the short wavelength in this part exciting light partly can be reuptaked emission again by optical wavelength conversion material.Optical filter 711,712 and 713 can play the effect of recycling photon like this, thereby improves the efficient of system.
Figure 11 has then illustrated the improvement embodiment of the light wavelength conversion parts on Fig. 5 and Fig. 6 basis.Different with Figure 10 embodiment is is used for carrying described optical wavelength conversion material in the described presumptive area of light wavelength conversion parts among Figure 10 embodiment base material is reflectorized material, and the base material among this Figure 11 is transparent material, and namely to be coated with the part of material for transformation of wave length or scattering material be transparent to the circular substrate of wheel 810.Same multiple optical wavelength conversion material can arrange such as but not limited to subregion 812,813 or 814 subregion, because no longer describing in detail with Figure 10 embodiment is similar.
The present invention is example with the embodiment of Fig. 3 structure, is that the hemisphere of 50mm is made reflector with a diameter, and establishing its inwall is 96% to the reflection of light rate; The light collecting part comprises a taper square rod, and its entrance is 2.3mmx1.8mm, exports to be 4.7mmx3.7mm, and length is 20mm, and the inwall reflectivity is made as 97.5%; Then when exciting light incides spot size on the material for transformation of wave length less than taper square rod entrance size, the luminous energy that is stimulated is effectively collected, Figure 12 has illustrated the analog result of ray trace: when the entrance size of the relative taper square rod of launching spot is 0.8, be hot spot when being 1.84mmx1.44mm, light collection efficiency is 78.5%.
In addition, the present invention tests discovery, light source of the present invention based on Fig. 4 or 7 structures can also improve as follows: semielliptical shape reflector 140 or the semielliptical shape transparent body 420 are substituted with hemispherical or spherical reflector or the transparent body that is easy to realize, the light inlet of light collecting part is arranged to close on the centre of sphere of this first light reflecting device, the placement of light wavelength conversion parts makes the luminous point that is subjected to of optical wavelength conversion material close on described centre of sphere place and described light inlet roughly about this centre of sphere symmetry, makes to be subjected to luminous point or light inlet more more good near this centre of sphere; The light wavelength conversion parts preferably also comprise the substrate (heat sink such as but not limited to what can conduct heat) of being with reflective surface, and optical wavelength conversion material is arranged on the reflective surface of this substrate, and relative with the light reflection surface of this first light reflecting device.Above-mentioned improvement structure also will have higher collection efficiency and light conversion efficiency.Equally, be the injury that prevents that optical wavelength conversion material from may come off vision is caused, this moment, logical light mouth can be set to the eccentric orfice of described hemispherical first light reflecting device, so that the collimated light beam of exciting light impinges perpendicularly on not the described optical wavelength conversion material at the centre of sphere.
Be understandable that, except above-mentioned hemispherical, semielliptical shape reflector, first light reflecting device can also be the curved reflectors of other form, even also can be other curved reflection unit of non-arc, zigzag reflection unit for example below is described in detail this.
See also Figure 13, Figure 13 has illustrated another alternative embodiment of Fig. 4 embodiment.As shown in figure 13, the main distinction part of present embodiment and Fig. 4 embodiment is: light source 1300 also comprises lens 330, is used for collecting and to be collimated to reflector 140 from the light of material for transformation of wave length; Reflector 140 is the curved reflectors of paraboloidal, and this reflector 140 is used for reflexing to the light inlet of the taper square rod 160 of the focus that is positioned over reflector 140 from the directional light of set of lenses 330.Because the light from material for transformation of wave length is approximate lambertian distribution, therefore the light of 330 pairs of these lambertian distribution of first scioptics group is collected and is relayed to reflector 140 again, with respect to from the direct outgoing of the light of material for transformation of wave length to reflector 140, have the light extraction efficiency advantage of higher.Be understandable that light extraction efficiency is being required under the lower application scenarios, and set of lenses 330 also can be omitted.
See also Figure 14, Figure 14 has illustrated another alternative embodiment of Fig. 4 embodiment.As shown in figure 14, the main distinction part of present embodiment and Fig. 4 embodiment is: the reflector 140 in the light source 1400 is the zigzag reflector, this zigzag reflector comprises two serrated faces 1401 and 1402, and each serrated face all is the part of one group of concentric spherical.With reference to the description among figure 4 embodiment as can be known, serrated face 1401 and 1402 all can play the effect of hemispherical reflector respectively, therefore the zigzag reflection unit can be regarded as the nested combination of one group of concentric hemispherical reflector, has the effect identical with hemispherical reflector for the light from material for transformation of wave length.The difference of zigzag reflector and hemispherical reflector is, the shared space of zigzag reflector is littler, more compact structure.Be understood that easily this zigzag reflector may comprise plural concentric serrated face.Similar to present embodiment, serrated face also may be the nested combination with one group of ellipse of same focal point, it also may be the one group of paraboloidal nested combination (with reference to embodiment shown in Figure 13) with same focal point, those skilled in the art can determine its optical texture according to top description, differ here one to give unnecessary details for example.
Comprehensive the various embodiments described above, light source of the present invention can be reduced to most: comprise that the excitation source that is used to provide exciting light reaches the optical wavelength conversion material away from this excitation source, this optical wavelength conversion material is used for converting exciting light to stimulated luminescence; Also comprise guiding and separating the light conduction device of exciting light input path and stimulated luminescence emitting light path, in order to distinguish the light path of stimulated luminescence and exciting light, the optical extend that this light conduction device conduction exciting light has is little or equal 1/4 of optical extend that this light conduction device conduction stimulated luminescence has.
Claims (28)
1. a light source comprises the excitation source that is used to provide exciting light, and away from the light wavelength conversion parts of excitation source, these light wavelength conversion parts comprise exciting light is converted to the optical wavelength conversion material of stimulated luminescence; Also comprise directs excitation light and incide light guide member on the optical wavelength conversion material and the light collecting part that is used for collecting the stimulated luminescence that is derived from optical wavelength conversion material; It is characterized in that:
Described smooth collecting part comprises changing first light reflecting device of the projecting direction of stimulated luminescence, and first light reflecting device is the reflecting piece that has light hole;
Described smooth guide member is described light hole, is injected toward optical wavelength conversion material by this light hole from the exciting light of excitation source;
Described smooth collecting part also comprises an optical module, this optical module is the combination of one of set of lenses, lens, hollow light guiding rod, solid lamp guide, Hollow Compound type concentrator, solid composite type concentrator, the plane of reflection or these optical elements of reflecting curved surface or these optical elements, and the described stimulated luminescence that is derived from optical wavelength conversion material shoots to described reflecting piece through the collection of this optical module with the form of nearly directional light;
In order to distinguish the light path of stimulated luminescence and exciting light, the optical extend of described smooth guide member little or equal described smooth collecting part optical extend 1/4, excessively escape thereby avoid stimulated luminescence to pass through this light guide member when utilizing this light guide member to introduce exciting light.
2. light source according to claim 1, it is characterized in that: described light wavelength conversion parts also comprise the substrate of being with reflective surface, and optical wavelength conversion material is arranged on this reflective surface, and between described reflective surface and first light reflecting device.
3. light source according to claim 1, it is characterized in that: described optical module is set of lenses, the area that described light hole projects to this set of lenses equals 1/4 of the own area of set of lenses for a short time.
4. light source according to claim 1 is characterized in that: described smooth collecting part also is used for collecting the exciting light that is not absorbed by material for transformation of wave length that is derived from optical wavelength conversion material.
5. light source according to claim 1 is characterized in that: described light hole is provided with the deielectric-coating of transmission exciting light and reflection stimulated luminescence.
6. light source according to claim 1 is characterized in that:
Also comprise optical filter, brightness enhancement sheet or reflection of polarization sheet, be arranged on light inlet place or the light-emitting window place of described reflecting piece, perhaps be close to described optical wavelength conversion material and arrange.
7. light source according to claim 6 is characterized in that:
Described optical filter is arranged on the surface of described light wavelength conversion parts, the light transmission features of the described optical filter between the exciting light that is introduced into and optical wavelength conversion material is: transmission stimulated luminescence and incidence angle are the exciting light of 0～15 degree, and being reflected into firing angle simultaneously is the above exciting lights of 15 degree.
8. light source according to claim 1 is characterized in that:
Also comprise between excitation source and described light hole exciting light is spared the dodging device of light and shaping.
9. light source according to claim 8 is characterized in that:
Described dodging device comprises fly eye lens array, hollow light guiding rod, solid lamp guide or scattering sheet.
10. light source according to claim 1, it is characterized in that: described light wavelength conversion parts also comprise the scattering material that is mingled in the described optical wavelength conversion material.
11. according to each described light source in the claim 1 to 10, it is characterized in that:
Described light wavelength conversion parts also comprise the movable body of the described optical wavelength conversion material of a carrying, and the motion of this movable body makes the range of exposures that the optical wavelength conversion material in the presumptive area enters the exciting light of being introduced by the light guide member by turns.
12. light source according to claim 11 is characterized in that:
Described movable body comprises wheel disc, cylinder or the mobile travelling carriage of rotation; The base material that is used for carrying described optical wavelength conversion material in the described presumptive area is reflectorized material.
13. light source according to claim 11 is characterized in that:
The optical wavelength conversion material that comprises one or more in the described presumptive area, these optical wavelength conversion material subregion regular distribution.
14. light source according to claim 13 is characterized in that:
The light wavelength conversion parts also comprise be close to described optical wavelength conversion material and be arranged on optical wavelength conversion material and the light collecting part between optical filter, according to the difference of optical wavelength conversion material on the corresponding subregion, the printing opacity wavelength of optical filter is different.
15. a light source comprises the excitation source that is used to provide exciting light, away from the light wavelength conversion parts of excitation source, these light wavelength conversion parts comprise exciting light is converted to the optical wavelength conversion material of stimulated luminescence; Also comprise directs excitation light and incide light guide member on the optical wavelength conversion material and the light collecting part that is used for collecting the stimulated luminescence that is derived from optical wavelength conversion material; It is characterized in that:
Described smooth collecting part comprises an optical module, this optical module is the combination of one of set of lenses, lens, hollow light guiding rod, solid lamp guide, Hollow Compound type concentrator, solid composite type concentrator, the plane of reflection or these optical elements of reflecting curved surface or these optical elements, and the described stimulated luminescence that is derived from optical wavelength conversion material penetrates light source with the form of nearly directional light by an emitting light path through the collection of this optical module;
Described smooth guide member is second light reflecting device that is arranged in the described emitting light path, and the light reflection surface of this second light reflecting device is the past optical wavelength conversion material of exciting light reflection from excitation source;
In order to distinguish the light path of stimulated luminescence and exciting light, the area of the outgoing hot spot of described stimulated luminescence is more than 4 times or 4 times of the projected area of second light reflecting device on described outgoing hot spot, excessively escapes thereby avoid stimulated luminescence to pass through this light guide member when utilizing this light guide member to introduce exciting light.
16. light source according to claim 15 is characterized in that: described light wavelength conversion parts also comprise the substrate of being with reflective surface, and optical wavelength conversion material is arranged on this reflective surface, and between described reflective surface and first light reflecting device.
17. light source according to claim 15 is characterized in that: described optical module is set of lenses, the area that second light reflecting device projects to set of lenses equal for a short time set of lenses area 1/4.
18. light source according to claim 15 is characterized in that: described smooth collecting part also is used for collecting the exciting light that is not absorbed by material for transformation of wave length that is derived from optical wavelength conversion material.
19. light source according to claim 15 is characterized in that: second light reflecting device is the optical filtering reflector plate of transmission stimulated luminescence and reflection exciting light.
20. light source according to claim 15 is characterized in that:
Also comprise optical filter, brightness enhancement sheet or reflection of polarization sheet, be arranged on the light-emitting window place of light source, perhaps be close to described optical wavelength conversion material and arrange.
21. light source according to claim 20 is characterized in that:
Described optical filter is arranged on the surface of described light wavelength conversion parts, the light transmission features of the described optical filter between the exciting light that is introduced into and optical wavelength conversion material is: transmission stimulated luminescence and incidence angle are the exciting light of 0～15 degree, and being reflected into firing angle simultaneously is the above exciting lights of 15 degree.
22. light source according to claim 15 is characterized in that:
Also comprise between excitation source and second light reflecting device exciting light is spared the dodging device of light and shaping.
23. light source according to claim 22 is characterized in that:
Described dodging device comprises fly eye lens array, hollow light guiding rod, solid lamp guide or scattering sheet.
24. light source according to claim 15 is characterized in that: described light wavelength conversion parts also comprise the scattering material that is mingled in the described optical wavelength conversion material.
25. according to each described light source in the claim 15 to 24, it is characterized in that:
Described light wavelength conversion parts also comprise the movable body of the described optical wavelength conversion material of a carrying, and the motion of this movable body makes the range of exposures that the optical wavelength conversion material in the presumptive area enters the exciting light of being introduced by the light guide member by turns.
26. light source according to claim 25 is characterized in that:
Described movable body comprises wheel disc, cylinder or the mobile travelling carriage of rotation; The base material that is used for carrying described optical wavelength conversion material in the described presumptive area is reflectorized material.
27. light source according to claim 25 is characterized in that:
The optical wavelength conversion material that comprises one or more in the described presumptive area, these optical wavelength conversion material subregion regular distribution.
28. light source according to claim 27 is characterized in that:
The light wavelength conversion parts also comprise be close to described optical wavelength conversion material and be arranged on optical wavelength conversion material and optical module between optical filter, according to the difference of optical wavelength conversion material on the corresponding subregion, the printing opacity wavelength of optical filter is different.
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Effective date of registration: 20171109 Address after: 518055 Guangdong city of Shenzhen province Nanshan District Xili town tea light road Shenzhen city integrated circuit design and application of Industrial Park 401 Patentee after: APPOTRONICS Corp.,Ltd. Address before: 518057 Guangdong city of Shenzhen province Nanshan District Xili town tea light road on the south side of Shenzhen integrated circuit design and application of Industrial Park 402, 403, 410-1, 411 Yi Li Rui Light Technology Development Co. Ltd. Patentee before: YLX Inc. |
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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: APPOTRONICS Corp.,Ltd. Address before: 518000 20-22, 20-22 headquarters building, 63 high tech Zone, Xuefu Road, Nanshan District, Guangdong Province, Guangdong. Patentee before: SHENZHEN GUANGFENG TECHNOLOGY Co.,Ltd. |
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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 TECHNOLOGY Co.,Ltd. Address before: 518055 Guangdong province Shenzhen Nanshan District Xili town Cha Guang road Shenzhen integrated circuit design application Industrial Park 401 Patentee before: APPOTRONICS Corp.,Ltd. |