CN103292254B - Light source - Google Patents
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- CN103292254B CN103292254B CN201310131462.2A CN201310131462A CN103292254B CN 103292254 B CN103292254 B CN 103292254B CN 201310131462 A CN201310131462 A CN 201310131462A CN 103292254 B CN103292254 B CN 103292254B
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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 divisional application that the present invention is application number is 201110403775.X, the applying date is on December 7th, 2011, denomination of invention is the patent application of " light source ".The present invention relates to light source, particularly relate 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 display market.
The mode producing white light or coloured light generally has two kinds: one directly utilizes coloured light light source if red, green or blue-ray LED is to provide coloured light, or utilize these coloured light to carry out synthesize white light; Another kind carrys out excitation wavelength transition material based on light wavelength conversion excitation source to produce coloured light, and then utilize exciting light or excite the various coloured light of generation to carry out synthesize white light.Such as so that short wavelength can be produced as the light source of blue light or UV light for excitation source carrys out excitation wavelength transition material, such as but not limited to such as fluorescent material.For green glow, current green light LED or green (light) laser are because being difficult to accomplish that efficiently price is very high; Otherwise the solid-state devices efficiency of blue light and UV light is high and price is low, adopts rear a kind of scheme to produce green glow and there are larger market prospects undoubtedly.
For fluorescent material, tradition is based on light conversion and adopt the light source of LED chip generally fluorescent material to be located at LED chip surface.Its weak point is: when partially-excited luminous penetration phosphor layer backscattering returns LED chip, because LED chip has certain absorptivity to light, this part stimulated luminescence can not be completely reflected into the emergent light of light source, can have certain loss; In addition, between the heat that LED chip sends and the heat that fluorescent material sends, there is interacting, by the reduction luminous efficiency of LED chip and the conversion efficiency of fluorescent material, even shorten the life-span of LED component.Therefore, the light source of this class formation is difficult to accomplish high brightness.
US Patent No. 7,070,300B2, for overcoming above-mentioned defect, adopts a kind of method being separated LED and fluorescent material, specifically as shown in Figure 1.Exciting light from one or more LED light source 102 is collimated with optical collimator 108, recycling wavelength chooses sheet 110 reflexes to another collimator apparatus 114 these exciting lights to carry out focusing on rear projection toward phosphor sheet 112, from this phosphor sheet 112 stimulated luminescence transmission described in wavelength chooses sheet 110 and be provided as the emergent light of light source.In this scenario, stimulated luminescence can not retroeflection to LED chip, LED chip produce heat and fluorescent material produce heat can not interact.And the light path differentiation effect that wavelength chooses sheet 110 pairs of exciting lights and stimulated luminescence play contributes to the extraction of stimulated luminescence, and the stimulated luminescence of most backscattering or exciting light are recycled, substantially can solve the problem existing for above-mentioned conventional art.But the program also exists its weak point: be generally square or rectangle based on existing LED chip, its emergent light is lambertian distribution, and energy high efficiency is collected and the optics module collimated from the light of this LED chip is comparatively difficult to be designed and make; This or be also this invention product so far there are no business-like major reason.In addition, due to the light splitting of wavelength chooses sheet 110, exciting light fails to be provided as the emergent light of light source, for when selecting blue-ray LED for excitation source, light source if desired blue light composition needs add one group of blue-ray LED again and colimated light system carries out conjunction light, certainly will increase light source cost and increase volume and the structure complexity of light source.
Summary of the invention
The technical problem to be solved in the present invention is for above-mentioned the deficiencies in the prior art part, and proposes a kind of light source, realizes being separated of excitation source and optical wavelength conversion material with simple light path and structure.
For solving the problems of the technologies described above, basic conception of the present invention is: while separate excitation sources and optical wavelength conversion material, the situation that stimulated luminescence should be allowed to be extracted separately exists, also to allow that the situation that stimulated luminescence and the exciting light be not absorbed and used are extracted simultaneously exists, for this reason for save the accounting for body space of light source consider to make exciting light and stimulated luminescence common optical pathways time, be also noted that the introducing device avoiding introducing exciting light is to stimulated luminescence reflection or the loss that causes of transmission, the present invention notices that the stimulated luminescence of optical wavelength conversion material has the feature of approximate Lambertian distribution, the light collecting device of its correspondence should have larger light blood propagation, and simultaneously incident excitation beam preferably has less optical extend to improve the light conversion efficiency of optical wavelength conversion material, thus the present invention expects to be reduced this introducing device by the optical extend limiting described introducing device on the impact of stimulated luminescence, namely, the difference of the optical extend of the optical extend of incident light source and the stimulated luminescence of optical wavelength conversion material can be utilized to be incorporated in the emitting light path of stimulated luminescence by the input path of exciting light, reduce the loss that this introducing causes unabsorbed stimulated luminescence simultaneously, reach while distinguishing stimulated luminescence and exciting light light path like this, be convenient to the structure simplifying light source.
As the technical scheme realizing the present invention's design be, a kind of light source is provided, comprise the excitation source being used to provide exciting light, away from the light wavelength conversion member of excitation source, this light wavelength conversion member comprises the optical wavelength conversion material for exciting light being converted to stimulated luminescence; Also comprise the light guide member incided for directs excitation light on optical wavelength conversion material, and be used for collecting the light collecting part of the stimulated luminescence being 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, thus utilize this light guide member to avoid stimulated luminescence excessively to be escaped by this light guide member while introducing exciting light.
As realizing the technical scheme of the present invention's design still, provide a kind of light source, comprise the excitation source being 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 the light conduction device for guiding and be separated 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 the optical extend that this light conduction device conduction stimulated luminescence has.
Adopt above-mentioned each technical scheme, have that light path is simple, optics be easy to process realize, practical advantage, be convenient to the emergent light wave-length coverage according to the lighting demand accommodation light source of system simultaneously and larger change need not be done to light-source structure.
Accompanying drawing explanation
Fig. 1 illustrates the existing structure producing the light source of efficient coloured light based on LED and fluorescent material;
Fig. 2 embodiment illustrates light source of the present invention with the light collecting part with logical light mouth to distinguish the structure of light path;
Fig. 3 embodiment illustrates the present invention with the light-source structure of the reflecting surface in stimulated luminescence light path for light guide member;
Fig. 4 illustrates a kind of structure using ellipse spherical reflector of light source of the present invention;
Fig. 5 illustrate light source of the present invention a kind of use hemispherical reflector structure;
Fig. 6 illustrates the alternative embodiment of Fig. 5 embodiment;
Fig. 7 illustrates the alternative embodiment of Fig. 4 embodiment;
Fig. 8 illustrates one of modified embodiment of Fig. 4 embodiment;
Fig. 9 illustrates one of modified embodiment of Fig. 5 embodiment;
Figure 10 illustrates the modified embodiment two of Fig. 4 embodiment;
Figure 11 illustrates the modified embodiment two of Fig. 5 embodiment;
Figure 12 to illustrate in the present invention excitation light spot size to the influence curve of collection efficiency;
Figure 13 illustrates the alternative embodiment of Fig. 4 embodiment;
Figure 14 illustrates the alternative embodiment of Fig. 4 embodiment.
Detailed description of the invention
Below, shownschematically most preferred embodiment sets forth the present invention further by reference to the accompanying drawings.
The prerequisite using the present invention to distinguish the method for exciting light light path and stimulated luminescence light path is that light source should comprise the excitation source that optical wavelength conversion material and is used to provide exciting light.On this basis, arrange light collecting part to collect and guide the stimulated luminescence that is derived from optical wavelength conversion material or the unabsorbed exciting light of part to be provided as the emergent light of light source; Limit the optical extend of described excitation source little or equal described smooth collecting part optical extend 1/4; The light guide member that the optical extend of one optical extend and described excitation source is suitable is set, the emitting light path of the stimulated luminescence that light collecting part guides described in piggybacking, the exciting light injection from excitation source on optical wavelength conversion material.
Wherein, optical wavelength conversion material comprises fluorescent material, nano luminescent material or luminescent dye, can be combined by one or more transparent material, so that light source has and stable goes out light characteristic.For but be not limited to fluorescent material, transparent material can be transparent colloid (such as but not limited to silica gel) or transparent glass material, mixes or fused shaping with fluorescent material; Also can be transparent thin-film material, by fluorescent material hot pressing on this transparent plastic film material; Finally be arranged to predetermined component, such as light wavelength conversion member by with the form of coating or pad pasting.For having the moistureproof fluorescent material required, described fluorescent material can also be clamped with the above-mentioned any transparent material mentioned, and can seal further.For strengthen optical wavelength conversion material to the scattering process of incident light and improve optical wavelength conversion material to the absorptivity of exciting light, scattering material can also be mixed in optical wavelength conversion 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 sending out short-wavelength light as the LED of UV or blue light or semiconductor laser.When exciting light is blue light, blue light can be converted to ruddiness, green glow, the ruddiness of gold-tinted, green glow, yellow fluorescent powder for being respectively used to by material for transformation of wave length.What deserves to be explained is herein, when material for transformation of wave length comprises for this blue light is converted to the yellow fluorescent powder 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 not by the blue excitation light that material for transformation of wave length absorbs, thus light source can the white light that is made up of yellow stimulated luminescence and blue excitation light of outgoing.
The present invention first sets forth the structure of light source for Fig. 2.Light source of the present invention at least comprises the excitation source 110 being used to provide exciting light, and away from the light wavelength conversion member of excitation source, this light wavelength conversion member comprises the optical wavelength conversion material 150 for exciting light being converted to stimulated luminescence.Light source of the present invention also comprises the light guide member (light hole on such as reflecting piece 130A) incided for directs excitation light on optical wavelength conversion material, and is used for collecting the light collecting part (such as set of lenses 330 and reflecting piece 130A) of the stimulated luminescence being derived from optical wavelength conversion material.In various embodiments, 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 little or equal light collecting part optical extend 1/4, thus utilize this light guide member to avoid stimulated luminescence excessively to be escaped by this light guide member while introducing exciting light.
In optics, optical extend (Etendue) is used to describe light distribution area in space and angle.Optical extend can expand by optical wavelength conversion material; In the embodiment of fig. 2, from the exciting light of excitation source 110 after in light hole direct projection to optical wavelength conversion material 150, the stimulated luminescence sent from this optical wavelength conversion material is approximate Lambertian distribution, and etendue quantitative change is much larger.To the outgoing of gathering system front stimulated luminescence and not the exciting light that absorbs by optical wavelength conversion material shoot to reflecting piece 130 through the collection of collimation lens set 330 with the form of nearly directional light, and then major part is utilized effectively by output after reflecting piece 130A with holes reflection, fraction will spill and be depleted from hole.The optical extend of the exciting light sent due to light source 110 is less, the size of control hole can account for the very small scale of whole smooth collecting part; And the optical extend of the stimulated luminescence collected through collimation lens set 330 is comparatively large, therefore the ratio that can control light leakage loss from hole is in a tolerance interval.Little 1/4 of the own area of set of lenses that equals of area that in practicality, this hole projects to set of lenses 330 can be accepted by light source.
For Fig. 2, if light wavelength conversion member also comprises 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 being conducive to two-sided outgoing is collected by set of lenses 330 completely by being reflected into the same face, and then improves the efficiency of light of light source.If light wavelength conversion member also comprises one and is close to described heat sink heat abstractor 152, will contribute to by the heat radiation of optical wavelength conversion material and then light conversion efficiency be kept.If described light wavelength conversion member 150 ~ 152 is configured to removable or rotates, more contribute to described heat radiation undoubtedly.
Light source in Fig. 2 comprises dodging device exciting light being carried out to even light and shaping between excitation source 110 and described smooth guide member (light hole) further, 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 be used in light source of the present invention further, are arranged on light inlet place or the light-emitting window place of light collecting part, or are close to described optical wavelength conversion material and arrange to obtain certain effects.Optical filter 180 as being placed on light-emitting window place in Fig. 2 can be used for adjusting the spectrum of light source emergent light: when selecting this optical filter 180 to have the characteristic of reflected excitation light and transmission stimulated luminescence, light source can provide the stimulated luminescence of pure color to export, the exciting light be not simultaneously absorbed and used carries out secondary or recycled for multiple times through reflecting piece 130A reflected light material for transformation of wave length 150, is conducive to the excitation improving light.The film 170 be arranged on optical filter 180 can be brightness enhancement film or diffraction optics film; Or directly use brightness enhancement sheet or reflection of polarization sheet to replace film 170 and optical filter 180, thus improve the brightness of light source emergent light or produce 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 films/sheets also can be placed on the surface of wavelength convert parts especially optical wavelength conversion material.For optical filter, described optical filter between the exciting light be introduced into and optical wavelength conversion material can make of multilayer dielectric film, to have predetermined light transmission features: the exciting light such as but not limited to transmissive stimulated luminescence and incidence angle being 0 ~ 15 degree, be reflected into the exciting light that firing angle is more than 15 degree simultaneously, stimulated luminescence is allowed to pass through selectively like this, allow the low-angle exciting light from excitation source 110 pass through simultaneously, and effectively stop the exciting light by optical wavelength conversion material 150 scattering is returned to pass through, thus effectively improve light source to the service efficiency of exciting light.
In fact the light collecting part in Fig. 2 embodiment or light guide member can by various different device with different combinations replace.Light-source structure under the present invention's design can specifically: the stimulated luminescence collected by described smooth collecting part penetrates light source by an emitting light path; Described smooth guide member is the second light reflecting device be arranged in 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 emergent light spot of stimulated luminescence is more than 4 times or 4 times of the projected area of this second light reflecting device in described emergent light spot.Take Fig. 3 as representative, light source at least comprises excitation source 110, away from excitation source light wavelength conversion member (at least comprising optical wavelength conversion material 150) outward, also at least comprise for the light collecting part of set of lenses 330 with for second light reflecting device of reflecting piece 130B.Incident exciting light is by reflecting piece 130B reflection toward optical wavelength conversion material 150, and the stimulated luminescence of two-sided outgoing penetrates with nearly directional light after the reflection of light wavelength conversion member and the collection of set of lenses 330.Control that the size relative lens group 330 of reflecting piece 130B is less can control to be reflected by this reflecting piece 130B and fail the ratio of stimulated luminescence of outgoing.From practical standpoint, little 1/4 of the area of set of lenses 330 that equals of area that reflecting piece 130B projects to set of lenses 330 is can be received.
The placed angle of illustrated reflecting piece 130B makes incident light become 90 degree with emergent light, and in fact described rotation angle can be make incident light and radiative angle not become 90 degree of other angles intersected.The shape of reflecting piece 130B can be circular, oval or rectangle, or even irregularly shaped.In addition, plane reflecting slice 130B can also by camber reflection light microscopic or with reflective surface amorphous body be equal to replacement, the shape of curved surface can be sphere, ellipsoid, parabola or free form surface etc.Further, the optical filtering reflector plate of reflecting piece 130B transmissive stimulated luminescence and reflected excitation light replaces reducing the stimulated luminescence loss introduced reflecting piece 130B and cause.
Correspondingly, replacement can be equal to other imaging or non-imaged device and combination thereof for the light collecting part of set of lenses 330, such as 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 the taper square rod having realized commercially producing, or be disclosed in US Patent No. 3, hollow or the solid composite type concentrator of 923,381.These devices and use thereof are ripe technology, and the present invention does not repeat at this.
The embodiment of complex chart 2 and Fig. 3, light guiding member can be plane mirror or curved reflector, or is the light hole on 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's design can also specifically describe and be: light collecting part comprises the first light reflecting device of the projecting direction for changing stimulated luminescence; Light guide member is be arranged on the Tong Guangkou on this first light reflecting device, and the exciting light from excitation source is injected toward optical wavelength conversion material from this logical light mouth; The area of described logical light mouth little or equal this first light reflecting device reflective surface area 1/4.Fig. 2 embodiment is one of representative meeting this description scheme: described first light reflecting device comprises the reflective surface with described logical light mouth, such as, with the reflecting piece 130A of logical light mouth in this figure.If be covered with the deielectric-coating for transmission exciting light and reflection stimulated luminescence on described logical light mouth, be conducive to the stimulated luminescence proportion of goods damageds reducing this light-source structure.
Except Fig. 2 embodiment, the embodiment meeting this description scheme can also list more.The present invention will illustrate one by one with Fig. 4 ~ 11.To the parts with the various embodiments described above in Fig. 4 ~ 11 with identical label, if because of its effect in Fig. 4 ~ 11 with in the various embodiments described above quite, then perhaps separately will not elaborate to these parts.
If the first light reflecting device in this description scheme is designed in semielliptical shape or hemispherical, to have light reflection surface inwardly, then light source of the present invention will have higher efficiency and more compact structure.For Fig. 4 and Fig. 7, when this first light reflecting device is semielliptical shape, the light inlet of light collecting part is set to show greatly centered by a focus of this first light reflecting device; The placement of light wavelength conversion member makes another focus place place being roughly in this first light reflecting device by luminous point of optical wavelength conversion material.For Fig. 5 and Fig. 6, when this first light reflecting device is hemispherical, the light inlet of light collecting part is arranged to the centre of sphere closing on this first light reflecting device; The placement of light wavelength conversion member make optical wavelength conversion material to be roughly in described centre of sphere place by luminous point relative across optical wavelength conversion material with described light inlet.
Concrete elaboration Fig. 4 embodiment: light source comprises excitation source 110 and light wavelength conversion member (at least comprising optical wavelength conversion material 150).First light reflecting device is for the semielliptical shape reflector 140 of hollow structure, inwall plating reflectance coating, and logical light mouth is the opening on this semielliptical shape reflector 140 reflecting wall.Described reflectance coating is metal film or the deielectric-coating of reflected excitation light and stimulated luminescence.In this embodiment, 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 a focus of semielliptical shape reflector 140.Same foregoing embodiments, light wavelength conversion member comprises optical wavelength conversion material 150, preferably also comprise the substrate (such as but not limited to heat sink 151) that a surface is coated with reflectance coating or band reflective surface, on the reflective surface that optical wavelength conversion material is arranged on heat sink 151 or reflectance coating, and it is relative with the light reflection surface of reflector 140, namely optical wavelength conversion material heat sink 151 reflective surface and reflector 140 between, contribute to the stimulated luminescence of dual emission on optical wavelength conversion material 150 is penetrated by the same face; Being adjacent to described heat sink 151 establishes heat abstractor 152 to contribute to optical wavelength conversion material heat radiation.The placement of light wavelength conversion member makes another focus place place being roughly in this first light reflecting device by luminous point of optical wavelength conversion material 150.Dodging device comprises outside the lens arra 120 in previous embodiment, also comprises the collector lens 130 that is used for exciting light to converge to another focus place described; Suppose that this dodging device is evenly shaped to launching spot the rectangle that length-width ratio is 4:3.A rectangular light spot is incident upon another focus place described in semielliptical shape reflector 140 by the exciting light then from excitation source 110 after dodging device and logical light mouth, this semielliptical shape reflector 140 and then light inlet of the described taper square rod 160 being positioned near focal point will be reflexed to from the stimulated luminescence of optical wavelength conversion material 150 and unabsorbed exciting light, thered is provided the conjunction light of uniform stimulated luminescence and exciting light by the collection of taper square rod 160, closing light hot spot is rectangle.Described light inlet place can be placed on optical filter 180, adjust the spectrum of emergent light, to improve the excitation of emergent light.The bore controlling logical light mouth in this embodiment is the key of the light leak of exciting light reducing stimulated luminescence or be not absorbed and used.After tested, when the radius of this logical light mouth is 20% of the radius of semimajor axis of ellipsoid, the stimulated luminescence missed roughly accounts for and always sends 4% of stimulated luminescence.Therefore preferably the radius of this logical light mouth is controlled be less than or equal to 1/2 of semimajor axis of ellipsoid in practicality.
Fig. 7 example structure is substantially close to Fig. 4 structure.Unlike, the first light reflecting device is coated with the solid semielliptical shape transparent body 420 of reflectance coating 421 for positive camber in the figure 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 reflected excitation light and stimulated luminescence.In Fig. 7 embodiment, the disappearance of optical filter 180 makes light source export the conjunction light of stimulated luminescence and exciting light.Different from Fig. 4 embodiment is a bit in addition: in Fig. 7 embodiment, can arrange the air-gap made by having a thickness between the optical wavelength conversion material at luminous point place and the described transparent body and being less than 1% of semielliptical major semiaxis, this air-gap contributes to improving light output brightness.
In above-mentioned Fig. 4 or 7 embodiments, logical light mouth can consider the eccentric orfice being set to described semielliptical shape first light reflecting device, namely determine to make Tong Guangkou depart from described arcuation top one preset distance according to the position of the focus at described optical wavelength conversion material place, impinge perpendicularly on optical wavelength conversion material to make the collimated light beam of exciting light.Like this, when optical wavelength conversion material 150 accidentally comes off from the reflecting surface of heat sink 151, the exciting light of vertical incidence can be returned outside semielliptical shape first light reflecting device by vertical reflection, thus avoids the reflection of high brightness exciting light while being excitation source (especially adopt semiconductor laser) by semielliptical shape first light reflecting device by the collected injection of taper square rod 160 and may damage human eye vision.
Concrete elaboration Fig. 5 embodiment: light source comprises excitation source 110 and light wavelength conversion member (at least comprising optical wavelength conversion material 220).First light reflecting device is for the hemispherical reflector 240 of hollow structure, inwall plating reflectance coating, and logical light mouth is the opening on this hemispherical reflector 240 reflecting wall.Described reflectance coating is metal film or the deielectric-coating of reflected excitation light and stimulated luminescence.In this embodiment, 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 the centre of sphere closing on this hemispherical reflector 240.Light wavelength conversion member also comprises one and is used for carrying the transparent substrates 210 of optical wavelength conversion material 220, the placement of this light wavelength conversion member make optical wavelength conversion material 220 to be roughly in described centre of sphere place by luminous point relative across optical wavelength conversion material 220 with described light inlet.In this figure, optical wavelength conversion material 220 is applied to the one side of described transparent substrates 210 towards taper square rod 160, and in fact this optical wavelength conversion material 220 also can be applied to the one side of transparent substrates 210 towards hemispherical reflector 240.Or make after optical wavelength conversion material 220 and the encapsulating material such as glass, pottery etc. can also being mixed and there is certain mechanical strength and substrate can not be relied on and self-existent light wavelength conversion member, to omit transparent substrates 210, being extracted of stimulated luminescence will be conducive to.
The collector lens 130 of dodging device is used for exciting light to converge near the described centre of sphere.The rectangular light spot that a length-width ratio is 4:3 projects near the described centre of sphere by the exciting light from excitation source 110 after dodging device and logical light mouth, stimulated luminescence is in the two-sided formation lambertian distribution of light wavelength conversion member, wherein forward light is directly collected by taper square rod 160, backward light reflects back into optical wavelength conversion material 220 through hemispherical reflector 240, because optical wavelength conversion material is very little to the absorption of its own transmission light, this part be reflected back to optical wavelength conversion material 220 stimulated luminescence will effectively after penetrating light material for transformation of wave length collected by taper square rod 160, this hemispherical reflector 240 also can carry out secondary or recycled for multiple times the scattering exciting light reflected light material for transformation of wave length 220 be not absorbed and used simultaneously, thus improves the utilization rate of exciting light.Light source can provide the conjunction light of stimulated luminescence and exciting light by the collection of taper square rod 160.Spectrum or the angle of emergent light can be adjusted equally with the optical filter 180 or blast sheet 170 being placed on this taper square rod 160 light inlet place, repeat no more.Similar with the embodiment of Fig. 4 or Fig. 7, the bore controlling logical light mouth is the key reducing stimulated luminescence light leak, is preferably controlled be less than or equal to 1/2 of half radius of a ball by the radius of this logical light mouth in practicality.
Fig. 6 embodiment is substantially close to Fig. 5 structure.Unlike, the first light reflecting device is coated with the solid hemispherical transparent body 320 of reflectance coating 321 for positive camber in figure 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 reflected excitation light and stimulated luminescence.In addition, light wavelength conversion member can only comprise to apply or pad pasting form is arranged on optical wavelength conversion material 310(on the hemispherical transparent body 320 and with the mixture of its doping as silica gel, scattering material etc.).Also have different from Fig. 5 embodiment a bit can be: in Fig. 6 embodiment, the air-gap made by having a thickness between the optical wavelength conversion material 310 at luminous point place and the described transparent body 320 and being less than 1% of half radius of a ball can be set, to help raising light conversion ratio and improve light output intensity.In addition, in order to the diversity of light collecting part implementation is described, in the present embodiment, replace the taper square rod 160 in Fig. 5 embodiment by lens or set of lenses 330.Optical filter 180 between optical wavelength conversion material 310 and set of lenses 330 or brightness enhancement film 170 or polarised light select sheet etc. can be used for changing the characteristic of emergent light equally.
The transparent body in above-mentioned Fig. 6 or Fig. 7 embodiment can be transparent glass or plastics.Described logical light mouth 322 or 422 place can be coated with the deielectric-coating for 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 roughly can be arranged on the arcuation top of semielliptical shape or hemispherical first light reflecting device, so as from excitation source exciting light roughly direct projection toward optical wavelength conversion material.In addition, in order to reduce the loss that logical light mouth causes stimulated luminescence, one filter part can also be set at this logical light mouth place, the curvature on the arcuation surface making this filter part have is consistent in the curvature at this logical light mouth place with described first light reflecting device, and making to be plated in this arcuation, to be used for the light reflection surface smooth registration of the deielectric-coating of transmission exciting light and reflection stimulated luminescence and described light reflecting device on the surface integral.Light source as shown in Figure 8, the light source basis of Fig. 4 structure increases filter part, such as but not limited to bloomed lens 510 as shown in the figure.The left side curvature of this bloomed lens 510 is identical with semielliptical shape reflector 140 and be used for the deielectric-coating of transmission exciting light and reflection stimulated luminescence described in being coated with; The right side can be designed to have certain shape, such as but not limited to convex lens shape to be converged on optical wavelength conversion material 150 by the exciting light of incidence.The light source of Fig. 9 signal is then on the light source basis of Fig. 5 structure, increase the bloomed lens 610 of filling light hole, and this bloomed lens 610 has the structure similar with bloomed lens in Fig. 8 510 and effect, thus no longer describes in detail.Described bloomed lens 610 or 510 can also be replaced with optical filtering knee-piece, and described optical filtering knee-piece is designed to the characteristic with transmission exciting light and reflection stimulated luminescence.In fact be also one of form of expression of described filter part about the deielectric-coating be coated on logical light mouth 322 or 422 mentioned in Fig. 6 or 7 embodiment discussion.
The present invention can also improve the embodiment of each figure in above-mentioned Fig. 2 ~ 8, light wavelength conversion member is such as made also to comprise the movable body of the described optical wavelength conversion material of a carrying, the motion of this movable body make the optical wavelength conversion material rotation in presumptive area enter the range of exposures of exciting light introduced by light guide member, be conducive to solving the accumulated heat problem of optical wavelength conversion material like this and extend service life of light source (especially high power light source).Described movable body comprises the travelling carriage of the wheel disc of rotation, cylinder or movement; Be used for carrying the base material of described optical wavelength conversion material in described presumptive area or be reflectorized material, or be transparent material.Described base material is have a reflective surface heat sink for best, and optical wavelength conversion material is arranged on this reflective surface, and relative with light collecting part.Figure 10 illustrates a kind of improving the source of light on Fig. 4 architecture basics: take blue light source as excitation source be example; Light wavelength conversion member comprises rotary wheel 710; The material that the circular substrate that this wheel 710 is used for carrying optical wavelength conversion material adopts such as is not limited to metal or glass, this circular substrate plates reflective membrane, and then on reflective membrane, apply one or more optical wavelength conversion material, these optical wavelength conversion material subregion regular distribution, such as but not limited to red light fluorescent powder section 714 as shown in the figure or green light fluorescent powder section 715, not containing the reflecting surface section 716 of any fluorescent material.Described reflecting surface can apply barium sulfate or teflon coating.Can also be adulterated scattering material in each described optical wavelength conversion material.In order to design specific light source emergent light, described optical wavelength conversion material can also be close to optical filter is set between optical wavelength conversion material and light collecting part, and make the light transmitting wavelength of optical filter different according to the difference of optical wavelength conversion material on corresponding subregion, such as corresponding with red light fluorescent powder section 714 is Red lightscreening plate 712, the light being used for red light fluorescent powder to send filters, and makes 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 being coated with anti-reflection film.Filter segments 711,712 and 713 and optical wavelength conversion material or scattering material section 714,715 and 716 are assembled together and are rotated by a motor driving, the Frequency Synchronization that rotating speed can require with projector.Green color filter 711 and Red lightscreening plate 712 can reflect blue, so can be reflected back to fluorescent coating when being arrived optical filter 711 or 712 by the blue light that green emitting phosphor 715 or red fluorescence powder 714 reflect.Meanwhile, because optical filter 711 and 712 can get back to material for transformation of wave length by antireflection part exciting light, and the short wavelength's part in this part exciting light to be reuptaked by optical wavelength conversion material and again launches.Such optical filter 711,712 and 713 can play the effect recycling photon, thus improves the efficiency of system.
Figure 11 then illustrates the modified embodiment of the light wavelength conversion member on Fig. 5 and Fig. 6 basis.Be reflectorized material with Figure 10 embodiment unlike the base material being used for carrying described optical wavelength conversion material in presumptive area described in light wavelength conversion member in Figure 10 embodiment, and the base material in this Figure 11 is transparent material, namely the circular substrate of wheel 810 is coated with the part of material for transformation of wave length or scattering material is transparent.Same multiple optical wavelength conversion material can be arranged, because no longer describing in detail with Figure 10 embodiment is similar such as but not limited to subregion 812,813 or 814 subregion.
The present invention, for the embodiment of Fig. 3 structure, makees reflector with the hemisphere that a diameter is 50mm, if its inwall is 96% to light reflectance; Light collecting part comprises a taper square rod, and its entrance is 2.3mmx1.8mm, and export as 4.7mmx3.7mm, length is 20mm, and inwall reflectivity is set to 97.5%; When the spot size then incided on material for transformation of wave length when exciting light is less than taper square rod entrance opening dimension, the luminous energy that is stimulated effectively is collected, Figure 12 illustrates the analog result of ray trace: when the entrance opening dimension of the relative taper square rod of launching spot is 0.8, namely, when hot spot is 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 to be easy to the hemispherical of realization or spherical reflector or the transparent body, the light inlet of light collecting part is arranged to the centre of sphere closing on this first light reflecting device, the placement of light wavelength conversion member make optical wavelength conversion material close on described centre of sphere place by luminous point and described light inlet is roughly symmetrical about this centre of sphere, make by luminous point or light inlet more better close to this centre of sphere; Light wavelength conversion member preferably also comprises the substrate (heat sink such as but not limited to what can conduct heat) of band 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 modified node method also will have higher collection efficiency and light conversion efficiency.Equally, may to come off the injury that vision is caused for preventing optical wavelength conversion material, now logical light mouth can be set to the eccentric orfice of described hemispherical first light reflecting device, impinges perpendicularly on not at the described optical wavelength conversion material of the centre of sphere to make the collimated light beam of exciting light.
Be understandable that, except above-mentioned hemispherical, semielliptical shape reflector, the first light reflecting device can also be the curved reflectors of other form, even also can be other curved reflection unit of non-arc shape, such as zigzag reflection unit, is described in detail this below.
Refer to Figure 13, Figure 13 illustrates another alternative embodiment of Fig. 4 embodiment.As shown in figure 13, the main distinction part of the present embodiment and Fig. 4 embodiment is: light source 1300 also comprises lens 330, for being collected by the light from material for transformation of wave length and being collimated to reflector 140; Reflector 140 is the curved reflectors of paraboloidal, and this reflector 140 is for reflexing to the light inlet of the taper square rod 160 of the focus being positioned over reflector 140 by the directional light from set of lenses 330.Owing to from the light of material for transformation of wave length being approximate Lambertian distribution, therefore the light of first scioptics group 330 to this lambertian distribution is collected and is relayed to reflector 140 again, relative to the direct outgoing of light from material for transformation of wave length to reflector 140, there is the advantage that light extraction efficiency is higher.Be understandable that, under requiring lower application scenarios to light extraction efficiency, set of lenses 330 also can be omitted.
Refer to Figure 14, Figure 14 illustrates another alternative embodiment of Fig. 4 embodiment.As shown in figure 14, the main distinction part of the present embodiment and Fig. 4 embodiment is: the reflector 140 in light source 1400 is zigzag reflector, this zigzag reflector comprises two serrated faces 1401 and 1402, and each serrated face is a part for one group of concentric spherical.Known with reference to the description in figure 4 embodiment, serrated face 1401 and 1402 can play the effect of hemispherical reflector all respectively, therefore 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 space shared by zigzag reflector is less, more compact structure.It is easily understood that this zigzag reflector may comprise plural concentric serrated face.Similar to the present embodiment, serrated face may be also the nested combination of one group of ellipse with same focal point, also may be one group of paraboloidal nested combination (with reference to the embodiment shown in Figure 13) with same focal point, those skilled in the art can determine its optical texture according to description above, the citing that differs here repeats.
Comprehensive the various embodiments described above, light source of the present invention can be reduced to most: comprise the excitation source that is used to provide exciting light and 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 the light conduction device for guiding and be separated 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 the optical extend that this light conduction device conduction stimulated luminescence has.
Claims (26)
1. a light source, comprises the excitation source being used to provide exciting light, and away from the light wavelength conversion member of excitation source, this light wavelength conversion member comprises the optical wavelength conversion material for exciting light being converted to stimulated luminescence; Also comprise the light guide member incided for directs excitation light on optical wavelength conversion material, and be used for collecting the light collecting part of the stimulated luminescence being derived from optical wavelength conversion material; It is characterized in that:
Described smooth collecting part comprises the first light reflecting device of the projecting direction for changing stimulated luminescence, and the first light reflecting device is the reflecting piece with light hole;
Described light wavelength conversion member also comprises the substrate of band reflective surface, and be close to described substrate and be provided with heat abstractor, optical wavelength conversion material is arranged on this reflective surface, and between described reflective surface and the first light reflecting device;
Described smooth guide member is described light hole, and the exciting light from excitation source is injected toward optical wavelength conversion material from this light hole;
Described smooth collecting part also comprises an optical module, this optical module is the combination of set of lenses, lens, hollow light guiding rod, solid lamp guide, Hollow Compound type concentrator, solid composite type concentrator, one of the plane of reflection or these optical elements of reflecting curved surface or these optical elements, described in be derived from optical wavelength conversion material stimulated luminescence shoot 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, thus utilize this light guide member to avoid stimulated luminescence excessively to be escaped by this light guide member while introducing exciting light.
2. light source according to claim 1, is characterized in that: described optical module is set of lenses, and described light hole projects to that the area of this set of lenses is little equals 1/4 of the own area of set of lenses.
3. light source according to claim 1, is characterized in that: described smooth collecting part also for collect be derived from optical wavelength conversion material not by exciting light that material for transformation of wave length absorbs.
4. light source according to claim 1, is characterized in that: described light hole is provided with the deielectric-coating for transmission exciting light and reflection stimulated luminescence.
5. 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, or be close to described optical wavelength conversion material and arrange.
6. light source according to claim 5, is characterized in that:
Described optical filter is arranged on the surface of described light wavelength conversion member, the light transmission features of the described optical filter between the exciting light be introduced into and optical wavelength conversion material is: transmission stimulated luminescence and incidence angle are the exciting light of 0 ~ 15 degree, is reflected into the exciting light that firing angle is more than 15 degree simultaneously.
7. light source according to claim 1, is characterized in that:
Also comprise dodging device exciting light being carried out to even light and shaping between excitation source and described light hole.
8. light source according to claim 7, is characterized in that:
Described dodging device comprises fly eye lens array, hollow light guiding rod, solid lamp guide or scattering sheet.
9. light source according to claim 1, is characterized in that: described light wavelength conversion member also comprises the scattering material be mingled in described optical wavelength conversion material.
10. light source according to any one of claim 1 to 9, is characterized in that:
Described light wavelength conversion member also comprises the movable body of the described optical wavelength conversion material of a carrying, the motion of this movable body make the optical wavelength conversion material rotation in presumptive area enter the range of exposures of exciting light introduced by light guide member.
11. light sources according to claim 10, is characterized in that:
Described movable body comprises the travelling carriage of the wheel disc of rotation, cylinder or movement; The base material being used for carrying described optical wavelength conversion material in described presumptive area is reflectorized material.
12. light sources according to claim 10, is characterized in that:
One or more optical wavelength conversion material is comprised, these optical wavelength conversion material subregion regular distribution in described presumptive area.
13. light sources according to claim 12, is characterized in that:
Light wavelength conversion member also comprises is close to described optical wavelength conversion material and the optical filter be arranged between optical wavelength conversion material and light collecting part, and according to the difference of optical wavelength conversion material on corresponding subregion, the light transmitting wavelength of optical filter is different.
14. 1 kinds of light sources, comprise the excitation source being used to provide exciting light, and away from the light wavelength conversion member of excitation source, this light wavelength conversion member comprises the optical wavelength conversion material for exciting light being converted to stimulated luminescence; Also comprise the light guide member incided for directs excitation light on optical wavelength conversion material, and be used for collecting the light collecting part of the stimulated luminescence being 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 set of lenses, lens, hollow light guiding rod, solid lamp guide, Hollow Compound type concentrator, solid composite type concentrator, one of the plane of reflection or these optical elements of reflecting curved surface or these optical elements, described in be derived from optical wavelength conversion material stimulated luminescence penetrate 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 the second light reflecting device be arranged in 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;
Described light wavelength conversion member also comprises the substrate of band reflective surface, and be close to described substrate and be provided with heat abstractor, optical wavelength conversion material is arranged on this reflective surface, and between described reflective surface and the second light reflecting device;
In order to distinguish the light path of stimulated luminescence and exciting light, the area of the emergent light spot of described stimulated luminescence is more than 4 times or 4 times of the projected area of the second light reflecting device in described emergent light spot, thus utilizes this light guide member to avoid stimulated luminescence excessively to be escaped by this light guide member while introducing exciting light.
15. light sources according to claim 14, is characterized in that: described optical module is set of lenses, and the second light reflecting device projects to that the area of set of lenses is little equals 1/4 of the area of set of lenses.
16. light sources according to claim 14, is characterized in that: described smooth collecting part also for collect be derived from optical wavelength conversion material not by exciting light that material for transformation of wave length absorbs.
17. light sources according to claim 14, is characterized in that: the second light reflecting device is the optical filtering reflector plate of transmission stimulated luminescence and reflected excitation light.
18. light sources according to claim 14, 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, or be close to described optical wavelength conversion material and arrange.
19. light sources according to claim 18, is characterized in that:
Described optical filter is arranged on the surface of described light wavelength conversion member, the light transmission features of the described optical filter between the exciting light be introduced into and optical wavelength conversion material is: transmission stimulated luminescence and incidence angle are the exciting light of 0 ~ 15 degree, is reflected into the exciting light that firing angle is more than 15 degree simultaneously.
20. light sources according to claim 14, is characterized in that:
Also comprise dodging device exciting light being carried out to even light and shaping between excitation source and the second light reflecting device.
21. light sources according to claim 20, is characterized in that:
Described dodging device comprises fly eye lens array, hollow light guiding rod, solid lamp guide or scattering sheet.
22. light sources according to claim 14, is characterized in that: described light wavelength conversion member also comprises the scattering material be mingled in described optical wavelength conversion material.
23., according to claim 14 to the light source according to any one of 22, is characterized in that:
Described light wavelength conversion member also comprises the movable body of the described optical wavelength conversion material of a carrying, the motion of this movable body make the optical wavelength conversion material rotation in presumptive area enter the range of exposures of exciting light introduced by light guide member.
24. light sources according to claim 23, is characterized in that:
Described movable body comprises the travelling carriage of the wheel disc of rotation, cylinder or movement; The base material being used for carrying described optical wavelength conversion material in described presumptive area is reflectorized material.
25. light sources according to claim 23, is characterized in that:
One or more optical wavelength conversion material is comprised, these optical wavelength conversion material subregion regular distribution in described presumptive area.
26. light sources according to claim 25, is characterized in that:
Light wavelength conversion member also comprises is close to described optical wavelength conversion material and the optical filter be arranged between optical wavelength conversion material and optical module, and according to the difference of optical wavelength conversion material on corresponding subregion, the light transmitting wavelength of optical filter is different.
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| CN208953872U (en) | 2018-04-24 | 2019-06-07 | 中强光电股份有限公司 | Projection arrangement and its lighting system |
| CN110636270B (en) * | 2018-06-21 | 2022-02-22 | 深圳光峰科技股份有限公司 | Display device |
| CN109323206B (en) * | 2018-09-28 | 2020-07-17 | 朱晓 | Classroom lighting system with simulated outdoor lighting |
| CN111059488B (en) * | 2018-10-15 | 2022-03-15 | 深圳市绎立锐光科技开发有限公司 | Lighting device and lighting system |
| CN112797373B (en) * | 2019-11-13 | 2023-06-20 | 深圳市绎立锐光科技开发有限公司 | Light guide assembly and optical system |
| CN113376940B (en) | 2020-02-25 | 2022-09-20 | 中强光电股份有限公司 | Projection device and color gamut switching method thereof |
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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. |