The present invention is Application No. 201310046130.4, filing date February 5, denomination of invention in 2013
Divisional application for the patent application of " light-source system of a kind of compact conformation ".
Background technology
LASER Light Source, as a kind of high brightness, the new type light source of high collimation, is just progressively being applied to illumination, projection
Etc. every field.Wherein, utilize the light source of LASER Excited Fluorescence powder technology, have that etendue amount is little, brightness
The advantages such as height, life-span length, cause people's extensive concern.
Fig. 1 is a kind of light-source system that make use of LASER Excited Fluorescence powder technology in prior art.As it is shown in figure 1,
This light-source system includes excitation source 110, heat abstractor 120, the first reflecting mirror 130, collimating lens 140,
Collecting lens 150, phosphor powder layer 160, the second reflecting mirror 170.Typically, excitation source 110 is laser two
Pole is managed, and is welded on heat abstractor 120, and heat abstractor 120 is used for dispelling the heat it.Excitation source 110
The exciting light 180 produced first incides on the first reflecting mirror 130 and is reflected off, and reflection light then passes through collimation
Lens 140 and collecting lens 150, be ultimately incident upon on phosphor powder layer 160.Phosphor powder layer 160 is coated in
On two-mirror 170.Exciting light is incident from the front surface of phosphor powder layer 160, and is converted into another wavelength model
The Stimulated Light outgoing enclosed.The effect of reflecting mirror 170 is the luminous reflectance exported backward is returned front surface outgoing.From
The output light 190 of phosphor powder layer 160 outgoing includes by the Stimulated Light of phosphor powder layer sorption enhanced and the most glimmering
The residual excitation light that light bisque absorbs, through collection and the collimation of lens 150 and 160 after this output light 190 is first,
Last from the surrounding outgoing of reflecting mirror 130.Reflecting mirror 130 is in output light path, so it is defeated to block part
Go out light, but owing to its area is the least, this part light can be ignored.
Fig. 2 is the another kind of light-source system utilizing LASER Excited Fluorescence powder technology in prior art.This light-source system
Including excitation source 210, heat abstractor 220, the first reflecting mirror 230, collimating lens 240, collecting lens
250, phosphor powder layer 260, the second reflecting mirror 270.Typically, excitation source 210 is laser diode, viscous
Being connected on heat abstractor 220, heat abstractor 220 is used for dispelling the heat it.Light-source system shown in it and Fig. 1
Difference be, the small reflector 130 in Fig. 1 has been changed into the reflecting mirror 230 of band perforate 231, now,
The exciting light 280 that excitation source 210 sends will transmit through this perforate 231 and incides the front surface of phosphor powder layer 260,
And from the Stimulated Light of phosphor powder layer outgoing and do not have absorbed residual excitation light that synthesis is exported light 290, first
By collection and the collimation of lens 250 and 240, finally reflected output by reflecting mirror 230.In this structure,
Although perforate 231 can miss part output light, but owing to its area is the least, can ignore.
In two above example, last output light is all the mixed light of exciting light and Stimulated Light.The most also may be used
The light-dividing devices such as the small reflector in light-source system are replaced with the light splitting optical filter of monoblock, to light source shown in Fig. 1
For system, this light splitting optical filter reflected excitation light and transmission Stimulated Light;For light-source system shown in Fig. 2,
This light splitting filter transmission exciting light and reflect Stimulated Light.So, by the optical filtering of light splitting optical filter, can hinder
Only exciting light outgoing, makes to only have in output light Stimulated Light.
But, in the light-source system structure of existing LASER Excited Fluorescence powder technology, there is a defect, that
It is exactly that the exciting light that sends of excitation source must first pass through ability after the optical element such as collecting lens and collimating lens
Incide on fluorescent material, cause the light path between excitation source and phosphor powder layer oversize, need to consider to be placed simultaneously
The volume of light-dividing device so that whole system is bulky.Additionally, when excitation light power is the biggest, also need
Excitation source to be separately designed and the heat radiation of fluorescent material.
Detailed description of the invention
With embodiment, embodiments of the present invention are described in detail below in conjunction with the accompanying drawings.
First embodiment
Fig. 3 a is the structural representation of the first embodiment of the light-source system of the present invention.In fig. 3 a, light source system
System includes excitation source 310, heat abstractor 320, the first reflecting mirror 330, collimating lens 340, collecting lens
350, phosphor powder layer 360, the second reflecting mirror 370.Collimating lens 340 has towards phosphor powder layer 360
One surface 341.Excitation source 310 and phosphor powder layer 360 are arranged on the first surface 341 of collimating lens 340
Homonymy, the first reflecting mirror 330 is fixed on this first surface 341.Collecting lens 350 is positioned at collimating lens
Between 340 and phosphor powder layer 360.Additionally, excitation source 310 tilts to fix the exciting light 380 making its outgoing
Relative to the inclined light shaft of collimating lens 340, thus ensure that the exciting light 380 of excitation source 310 outgoing can enter
It is mapped on the first reflecting mirror 330, and is reflected off to phosphor powder layer 360.
In the present embodiment, excitation source 310 fixing (being most commonly used that welding) on heat abstractor 320,
Heat abstractor 320 is used for dispelling the heat it.First reflecting mirror 330 is fixed on the first table of collimating lens 340
On face 341, its effect is that the exciting light 380 sent by excitation source 310 reflexes to phosphor powder layer 360, institute
A suitable position should be positioned at: this position must be in the emergent light of collecting lens 350 at collimating lens with it
In the range of the hot spot formed on the first surface 341 of 340.Because of the principle reversible according to light path, if from
The full-shape luminescence of phosphor powder layer 360 outgoing can be irradiated to the first reflecting mirror 330, then also certainly exists one
Light path so that the exciting light reflected through the first reflecting mirror 330 also is able to incide on phosphor powder layer 360.Due to
First reflecting mirror 330 is positioned in the light path of output light, so the light from phosphor powder layer 360 output (includes being excited
Light and the residual excitation light not absorbed by phosphor powder layer) understand some and incide on the first reflecting mirror 330, should
Part light cannot will be exported by reflection, in order to make this reflection loss farthest reduce, it is necessary to anti-by first
The area design penetrating mirror 330 obtains sufficiently small;And simultaneously, for ensureing that the first reflecting mirror 330 can at utmost reflect
The exciting light 380 sent from excitation source 310, its area again can not be the least.Therefore the chi of the first reflecting mirror 330
Very little consideration of should compromising, and select the little light source of etendue amount as excitation source 310.Preferably, excite
Light source 310 selects laser diode, and the first reflecting mirror 330 is sized to just all reflections from this laser
All exciting lights of diode outgoing.
In order at utmost reduce the first reflecting mirror 330 to output light 390 block the loss caused, it is preferable that
Arrange this first reflecting mirror 330 to be positioned at from the light of collecting lens 350 outgoing at the first surface of collimating lens 340
The edge of the hot spot scope formed on 341 so that the exciting light 380 that excitation source 310 sends is anti-through first
After penetrating mirror 330 reflection, with the biggest incident angles in collecting lens 350, finally with the biggest
Incident angles is on phosphor powder layer 360.So layout is advantageous in that, because from phosphor powder layer 360 outgoing
The light light distribution in space will substantially present Lambert cosine distribution: the light intensity at centre normal is the strongest, angle
The biggest local light intensity is the most weak, is fixed on by the first reflecting mirror 330 from the light of collecting lens 350 outgoing at collimation
The edge of the hot spot scope formed on the first surface 341 of lens 340, can at utmost reduce reflecting mirror
The light intensity sheltered from, reduces the loss of output light, thus improves the efficiency of output light.
The effect of collecting lens 350 is to collect the light from phosphor powder layer 360 output, and reduces its dispersion angle.
In order to realize preferably receiving light effect, collecting lens 350 should be positioned at phosphor powder layer 360 front and immediately adjacent to
Phosphor powder layer.Preferably, collecting lens 350 is meniscus, and its concave surface is towards phosphor powder layer 360, so
It is advantageous in that: be incident in the angle of incidence ratio of concave surface from the light of phosphor powder layer 360 outgoing and be incident in plane or convex
The angle of incidence in face is little, therefore Fresnel reflection loss is little, and transmitance is higher.In order to realize the effect of beam convergence,
The radius of curvature of its concave surface should be greater than the radius of curvature of convex surface.
After collimating lens 340 is positioned in the light path of output light 390 and is positioned at collecting lens 350, its effect is
Carrying out the light from collecting lens 350 outgoing collimating outgoing, it has the first surface towards phosphor powder layer 360
341.In the present embodiment, this first surface 341 is plane, so can be easily by the first reflection 330
Paste thereon.It practice, the first reflecting mirror 330 also can be by the first surface 341 at collimating lens 340
Plating reflectance coating realizes: the region that other need not plated film uses fixture to shelter from, only a little local
Region plating reflectance coating.But its shortcoming is yielding poorly of plated film, and then relatively costly.
In the present embodiment, excitation source 310 is fixed relative to the second mirror tilt so that swashing of its outgoing
Luminescence 380 is oblique to be mapped on the first reflecting mirror 330 and is reflected off, and enters after reflection light transmission collecting lens 350
It is incident upon on phosphor powder layer 360.Phosphor powder layer 360 absorbs exciting light 380, and is partially converted to Stimulated Light,
The Stimulated Light converted and the exciting light not absorbed by fluorescent material synthesis output light 390 are from phosphor powder layer 360 table
Face exports.Wherein, the back side of phosphor powder layer 360 is pasted onto on the second reflecting mirror 370, can make from phosphor powder layer
The light of back side output is reflected back phosphor powder layer again, finally exports from front surface.Second reflecting mirror 370 is preferably
The metal basal board of electroplate, including aluminium base, copper base etc., this kind of metal basal board has suitable hardness,
There is higher thermal conductivity, the beneficially heat radiation of phosphor powder layer 360 simultaneously.
In the present embodiment, the first reflecting mirror 330 also can be replaced light splitting optical filter, and this light splitting optical filter reflects
Exciting light and transmission Stimulated Light, the most do not exist because Stimulated Light is blocked being excited of causing by the first reflecting mirror 330
The loss of light, can further improve defeated light extraction efficiency.In the case of the first reflecting mirror 330 is for light splitting optical filter,
Its area design can be obtained sufficiently large, such as, the first surface 341 of collimating lens 340 is completely covered so that defeated
The every part going out light 390 all must be transmitted through this light splitting optical filter outgoing.Light splitting optical filter reflected excitation light and saturating
Penetrating the characteristic of Stimulated Light so that contain only Stimulated Light composition in output light 390, this is equivalent to output light
390 effects playing filtering;The exciting light being simultaneously reflected back has again part can be again incident on phosphor powder layer
It is recycled on 360.
In the present embodiment, phosphor powder layer 360 and excitation source 310 can be made to share a heat abstractor, this can
The heat dissipation design of simplification whole system, further reduction system volume, as shown in Figure 3 b.Fig. 3 b is relative to figure
The difference of 3a is, has been fixed on same by heat-conducting medium 321 by excitation source 310 and the second reflecting mirror 370
On one heat abstractor 320.Heat-conducting medium is made up of high thermal conductivity material, and designs an inclined ramp guarantee
The emergent light of excitation source 310 is relative to the inclined light shaft of collimating lens 340.It practice, this heat-conducting medium
321 not necessarily, it is possible to directly excitation source 310 and the second reflecting mirror 370 is welded on heat abstractor 320
On.
In the present embodiment, phosphor powder layer 360 can also drive and cycle movement by driven device, so may be used
To avoid localized fluorescence powder to be stimulated and overheated generation thermal quenching phenomenon for a long time.Preferably, can be by phosphor powder layer
360 are coated on a rotatable substrate (this substrate can be the second above-mentioned reflecting mirror), and this substrate exists
High speed rotating under the driving of driving means (such as motor) thus help fluorescent material to dispel the heat.
In the present embodiment, phosphor powder layer 360 is also changed to other material for transformation of wave length, such as, quantum dot material
Material or fluorescent dye etc., as long as it can absorb exciting light and produce Stimulated Light, this replace with art technology
The common knowledge of personnel, also should comprise within the scope of the present invention.
Relative to prior art, in the present embodiment, the first reflecting mirror 330 serves original light-dividing device
Effect, but eliminates the volume shared by former light-dividing device, makes excitation source 310 and phosphor powder layer 360 simultaneously
In the homonymy of collimating lens 340, the distance between them is also no longer influenced by the limit of collecting lens and collimating lens
System, so that the volume of whole light-source system is greatly reduced.
Second embodiment
In the first embodiment, the exciting light in order to utilize the first reflecting mirror to be sent by excitation source reflexes to fluorescence
Bisque, by tilting to fix the inclined light shaft making its emergent light relative to collimating lens by excitation source;And
In the present embodiment, excitation source is the most vertically fixed, and its emergent light is relative to the optical axis keeping parallelism of collimating lens.
Fig. 4 a is the first structural representation of the light-source system of the present embodiment.In fig .4, light-source system bag
Include excitation source 410, heat abstractor 420, the first reflecting mirror 430, prism 431, collimating lens 440, receive
Collection lens 450, phosphor powder layer 460, the second reflecting mirror 470.Wherein, collimating lens 440 is planoconvex lens,
Being plane towards the first surface 441 of phosphor powder layer 460, excitation source 410 and phosphor powder layer 460 are arranged on
The homonymy of first surface 441, and excitation source 410 and the second reflecting mirror 470 be fixed on same heat abstractor
On 420.First reflecting mirror 430 is fixed on this first surface 441, and is positioned at from collecting lens 450 outgoing
The hot spot that formed on this first surface 441 of light in the range of.Collecting lens 450 is positioned at collimating lens 440
And between phosphor powder layer 460 and in close proximity to phosphor powder layer 460.
The present embodiment is relative to the difference of first embodiment: excitation source 410 is vertically fixed on heat abstractor
On 420, in order to make excitation source 410 outgoing exciting light 480 can oblique incidence on the first reflecting mirror 430,
A prism 431 it is provided with, as shown in fig. 4 a between excitation source 410 and the first reflecting mirror.Wherein, rib
Mirror 431 is positioned in the emitting light path of exciting light 480, and its effect is that deflection exciting light 480 can incide the
One reflecting mirror 430.As long as it will be understood by those skilled in the art that the optical element that can realize optical path-deflecting all can be expired
Foot requirement, including lens, reflecting mirror etc., the replacement of this optical element also should protection scope of the present invention it
In.The advantage of this structure is that excitation source can be vertically fixed on heat abstractor, installs more convenient, heat radiation
Device processing is easier to, and cost is lower.But shortcoming is need to increase extra optical element to realize the inclined of exciting light
Turning, the fixing and adjustment of this deflecting optical element all can make light-source system more complicated.
In order to realize excitation source right angle setting and don't need extra optical element to make exciting light deflect,
Also the first mirror tilt can be fixed, make the normal inclined light shaft relative to collimating lens of the first reflecting mirror,
As shown in Figure 4 b.The difference of Fig. 4 b and Fig. 4 a is, collimating lens 440 is meniscus, towards fluorescence
The first surface 441 of bisque 460 is concave surface.First reflecting mirror 430 is fixed on this first surface 441, and
In the range of being positioned at the hot spot that the light from collecting lens 450 outgoing is formed on this first surface 441.In this reality
Execute in example, owing to the first surface 441 of collimating lens 440 is processed to concave surface, so, by the first reflecting mirror
During the first surface 441 that 430 are pasted onto collimating lens 440, its normal is relative to the optical axis of collimating lens 440
Just having certain inclination, the exciting light 480 of outgoing vertically upward just can be reflexed to fluorescent material by this inclination angle
Layer 460.The shortcoming of this structure is: restriction and the collimating lens 440 to the position of excitation source 410
The requirement of the curvature of first surface 441 is the strictest, it is ensured that from the transmission vertically upward of excitation source 410 outgoing
Exciting light 480 can just incide on phosphor powder layer 460 after the reflection of the first reflecting mirror 430.Additionally,
Relative to light-source system above, the size of this light-source system structural requirement collimating lens 440 is sufficiently large, and swashs
Distance between luminous source 410 and the second reflecting mirror 470 is sufficiently small, with ensure from excitation source 410 vertically to
The exciting light 480 of upper outgoing can incide in collimating lens 440.
Another kind realizes the vertically arranged structure of excitation source as illustrated in fig. 4 c.In Fig. 4 c, collimating lens
440 is still planoconvex lens, is plane towards the first surface 441 of phosphor powder layer 460, but it and Fig. 4 a are not
It is with part: on this first surface 441, the place corresponding to exciting light 480 incidence is provided with a groove
442, this groove has the inner surface of inclination, and the first reflecting mirror 430 is just being integrally fixed at shape on its inclined inner surface
Becoming certain inclination angle, exciting light 480 incident vertically upward can be reflexed to phosphor powder layer 460 by this inclination angle.
This light-source system also requires that the size of collimating lens 440 is sufficiently large, and excitation source 410 and the second reflecting mirror
Distance between 470 is sufficiently small, to ensure that the exciting light 480 from excitation source 410 outgoing vertically upward can enter
It is mapped in collimating lens 440.
In the present embodiment, phosphor powder layer 460 equally keeps static or motion, and this change and first is in fact
Execute example identical, therefore repeat no more.
The present embodiment is relative to the advantage of first embodiment: excitation source can be vertically mounted on heat abstractor
On, source layout's Founder is more conducive to the reduction of volume.Excitation source can also share one with phosphor powder layer and dissipate
Thermal so that the design of heat abstractor and excitation source fixing simpler.
3rd embodiment
Fig. 5 is the structural representation of the 3rd embodiment of the light-source system of the present invention.In the present embodiment with first in fact
The difference executing example is: the excitation source in first embodiment has been replaced by excitation source group, this excitation source group
Including multiple independent excitation sources, it is respectively arranged at collimating lens 540 around.Corresponding, exist
One the first reflecting mirror group 530, this first reflecting mirror group 530 is made up of multiple reflecting mirrors, and the number of reflecting mirror
Mesh is identical with the number of the excitation source included in excitation source group, it is ensured that corresponding one of each excitation source
Reflecting mirror, the exciting light 580 that the excitation source of its correspondence sends can be reflexed to phosphor powder layer 560 by this reflecting mirror
On.By separately designing the position of each reflecting mirror 530, it is ensured that make the exciting light that all excitation sources send
580 same positions being all reflected onto phosphor powder layer 560, thus improve unit are fluorescent material to greatest extent
Brightness.
When the reflecting mirror included in the first reflecting mirror group 530 is more, all reflecting mirrors can be linked to be one whole
Body, thus form an axisymmetric catoptric arrangement.This catoptric arrangement may be located at collimating lens first surface
Edge or central authorities.Although embodiment above is all that the first reflecting mirror is fixed on the four of collimating lens first surface
In week, the actually first reflecting mirror can also be fixed on the central authorities of collimating lens, as shown in Figure 5.Shown in Fig. 5
Structure in, collimating lens 540 is planoconvex lens, is plane towards the first surface 541 of phosphor powder layer 560,
Central design in this plane has a conic convex, and it is anti-that the plated surface reflectance coating in this conic convex forms central authorities
Penetrate structure.The exciting light 580 incident from surrounding can be reflected down to phosphor powder layer by this central reflective structure 530
560.Certainly, the light from phosphor powder layer 560 outgoing also has part and is blocked by this central reflective structure 530
And cannot outgoing, but as long as the emergent light of the area ratio collecting lens 550 of this catoptric arrangement 530 is at collimating lens
The facula area formed on the first surface 541 of 540 is much smaller, and the loss of the output light that it causes is the most permissible
Ignore.This integrated design, not only eliminates the inconvenience fixing the first reflecting mirror, and makes exciting light
The fixed position in source is more flexible: due to the circumference symmetry of catoptric arrangement 530, it is not necessary to consider further that excitation source exists
The angle of incidence on circumferencial direction with collimating lens optical axis as axle.
Relative to first embodiment, advantage of this embodiment is that: owing to being provided with multiple excitation source composition
Excitation source group, can promote light-source brightness further, meanwhile, the first reflecting mirror is arranged to one overall anti-
Penetrating structure, the fixed position making excitation source is more flexible, and whole light-source system structure is the compactest small and exquisite.
It is appreciated that the extension of the present embodiment can also be used in the second embodiment, and there is same beneficial effect,
So also should be within protection scope of the present invention
4th embodiment
Fig. 6 a is the structural representation of the 4th embodiment of the light-source system of the present invention.The present embodiment is relative to
The difference of one embodiment is: phosphor powder layer 660 has relative first surface 661 and second surface 662,
The second reflecting mirror 671 it is provided with, in the setting further below of this second reflecting mirror 671 on second surface 662
There is the second excitation source 670.The second of this second reflecting mirror 671 energy transmission the second excitation source 670 outgoing swashs
Luminescence, and the Stimulated Light that reflected fluorescent light bisque 660 is sent.So, the of the first excitation source 610 outgoing
One exciting light 680 reflects through the first reflecting mirror 630, then passes through collecting lens 650 from phosphor powder layer 660
First surface 661 be incident to phosphor powder layer, the second exciting light of the second excitation source 670 outgoing is anti-through second
It is incident to phosphor powder layer from the second surface 662 of phosphor powder layer 660 after penetrating mirror 671 transmission, so phosphor powder layer
Two surfaces of 660 are by the luminescence that is excited simultaneously.Simultaneously as the second reflecting mirror 671 can go out by reflected fluorescent light powder
The Stimulated Light penetrated, so final Stimulated Light is by only from upper surface 661 outgoing of phosphor powder layer 660.
Preferably, the first excitation source 610 in the present embodiment is set to laser diode, the second excitation source
670 are set to laser diode or LED, and phosphor powder layer 660 is applied directly to this laser diode or LED
Surface, this can save the existence of the second reflecting mirror 671, as shown in Figure 6 b further.In figure 6b, make
Being that laser diode or the LED of the second excitation source has an active area 671, active area 671 is presented herein below substrate
672, a minute surface 673 can be formed between active area 671 and substrate 672, this minute surface 673 just serves as
The function of the second reflecting mirror in Fig. 6 a, for by the light from second surface 662 outgoing of phosphor powder layer 660
It is reflected back first surface 661 outgoing of phosphor powder layer 660, so that all light is all from the of phosphor powder layer 660
One surface 661 exports.
In the present embodiment, from the first exciting light of the first excitation source 610 outgoing with from the second excitation source
The optical wavelength of the second exciting light of 670 outgoing can be identical, it is also possible to different.When the first excitation wavelength and
During two excitation wavelength differences, second surface 662 at phosphor powder layer 660 light splitting can be set filter further
Sheet, this optical filter reflects the first exciting light and Stimulated Light, the second exciting light of transmission simultaneously.
In the present embodiment, phosphor powder layer may be configured as static or motion, the first excitation source and the second excitation source
Also can share a heat abstractor to carry out heat dissipation design, there is the useful effect equally identical with preceding embodiment
Really.
Relative to embodiment above, carry out excitated fluorescent powder from the two sides of phosphor powder layer in the present embodiment simultaneously,
Relative to the situation of one side excitated fluorescent powder, further increase the luminous intensity of unit are fluorescent material, thus
Make brightness output higher.
In above example, although be all that the first reflecting mirror is fixed on the first surface of collimating lens, actual
On, it is possible to the surface a certain distance making this reflecting mirror leave collimating lens fixes, and the most also will not change whole
The volume of individual light-source system, simply needs to increase extra fixing device, and effect is not as being directly anchored to collimation thoroughly
Mirror is first-class.
The foregoing is only embodiments of the invention, not thereby limit the scope of the claims of the present invention, every utilization
Equivalent structure or equivalence flow process that description of the invention and accompanying drawing content are made convert, or are directly or indirectly used in
Other relevant technical fields, are the most in like manner included in the scope of patent protection of the present invention.