WO2014121707A1 - Système de source lumineuse avec structure compacte - Google Patents

Système de source lumineuse avec structure compacte Download PDF

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Publication number
WO2014121707A1
WO2014121707A1 PCT/CN2014/071522 CN2014071522W WO2014121707A1 WO 2014121707 A1 WO2014121707 A1 WO 2014121707A1 CN 2014071522 W CN2014071522 W CN 2014071522W WO 2014121707 A1 WO2014121707 A1 WO 2014121707A1
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WIPO (PCT)
Prior art keywords
light source
mirror
excitation light
source system
collimating lens
Prior art date
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PCT/CN2014/071522
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English (en)
Chinese (zh)
Inventor
胡飞
杨毅
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深圳市光峰光电技术有限公司
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Publication of WO2014121707A1 publication Critical patent/WO2014121707A1/fr

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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21V—FUNCTIONAL FEATURES OR DETAILS OF LIGHTING DEVICES OR SYSTEMS THEREOF; STRUCTURAL COMBINATIONS OF LIGHTING DEVICES WITH OTHER ARTICLES, NOT OTHERWISE PROVIDED FOR
    • F21V29/00—Protecting lighting devices from thermal damage; Cooling or heating arrangements specially adapted for lighting devices or systems
    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03B—APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR
    • G03B21/00—Projectors or projection-type viewers; Accessories therefor
    • G03B21/14—Details
    • G03B21/20—Lamp housings
    • G03B21/2006—Lamp housings characterised by the light source
    • G03B21/2033—LED or laser light sources
    • G03B21/204—LED or laser light sources using secondary light emission, e.g. luminescence or fluorescence
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21V—FUNCTIONAL FEATURES OR DETAILS OF LIGHTING DEVICES OR SYSTEMS THEREOF; STRUCTURAL COMBINATIONS OF LIGHTING DEVICES WITH OTHER ARTICLES, NOT OTHERWISE PROVIDED FOR
    • F21V29/00—Protecting lighting devices from thermal damage; Cooling or heating arrangements specially adapted for lighting devices or systems
    • F21V29/50—Cooling arrangements
    • F21V29/70—Cooling arrangements characterised by passive heat-dissipating elements, e.g. heat-sinks
    • F21V29/74—Cooling arrangements characterised by passive heat-dissipating elements, e.g. heat-sinks with fins or blades
    • F21V29/76—Cooling arrangements characterised by passive heat-dissipating elements, e.g. heat-sinks with fins or blades with essentially identical parallel planar fins or blades, e.g. with comb-like cross-section
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21V—FUNCTIONAL FEATURES OR DETAILS OF LIGHTING DEVICES OR SYSTEMS THEREOF; STRUCTURAL COMBINATIONS OF LIGHTING DEVICES WITH OTHER ARTICLES, NOT OTHERWISE PROVIDED FOR
    • F21V13/00—Producing particular characteristics or distribution of the light emitted by means of a combination of elements specified in two or more of main groups F21V1/00 - F21V11/00
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21V—FUNCTIONAL FEATURES OR DETAILS OF LIGHTING DEVICES OR SYSTEMS THEREOF; STRUCTURAL COMBINATIONS OF LIGHTING DEVICES WITH OTHER ARTICLES, NOT OTHERWISE PROVIDED FOR
    • F21V13/00—Producing particular characteristics or distribution of the light emitted by means of a combination of elements specified in two or more of main groups F21V1/00 - F21V11/00
    • F21V13/12—Combinations of only three kinds of elements
    • F21V13/14—Combinations of only three kinds of elements the elements being filters or photoluminescent elements, reflectors and refractors
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21V—FUNCTIONAL FEATURES OR DETAILS OF LIGHTING DEVICES OR SYSTEMS THEREOF; STRUCTURAL COMBINATIONS OF LIGHTING DEVICES WITH OTHER ARTICLES, NOT OTHERWISE PROVIDED FOR
    • F21V29/00—Protecting lighting devices from thermal damage; Cooling or heating arrangements specially adapted for lighting devices or systems
    • F21V29/50—Cooling arrangements
    • F21V29/502—Cooling arrangements characterised by the adaptation for cooling of specific components
    • F21V29/503—Cooling arrangements characterised by the adaptation for cooling of specific components of light sources
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21V—FUNCTIONAL FEATURES OR DETAILS OF LIGHTING DEVICES OR SYSTEMS THEREOF; STRUCTURAL COMBINATIONS OF LIGHTING DEVICES WITH OTHER ARTICLES, NOT OTHERWISE PROVIDED FOR
    • F21V5/00—Refractors for light sources
    • F21V5/008—Combination of two or more successive refractors along an optical axis
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21V—FUNCTIONAL FEATURES OR DETAILS OF LIGHTING DEVICES OR SYSTEMS THEREOF; STRUCTURAL COMBINATIONS OF LIGHTING DEVICES WITH OTHER ARTICLES, NOT OTHERWISE PROVIDED FOR
    • F21V7/00—Reflectors for light sources
    • F21V7/22—Reflectors for light sources characterised by materials, surface treatments or coatings, e.g. dichroic reflectors
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21V—FUNCTIONAL FEATURES OR DETAILS OF LIGHTING DEVICES OR SYSTEMS THEREOF; STRUCTURAL COMBINATIONS OF LIGHTING DEVICES WITH OTHER ARTICLES, NOT OTHERWISE PROVIDED FOR
    • F21V9/00—Elements for modifying spectral properties, polarisation or intensity of the light emitted, e.g. filters
    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03B—APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR
    • G03B21/00—Projectors or projection-type viewers; Accessories therefor
    • G03B21/14—Details
    • G03B21/16—Cooling; Preventing overheating
    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03B—APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR
    • G03B21/00—Projectors or projection-type viewers; Accessories therefor
    • G03B21/14—Details
    • G03B21/20—Lamp housings
    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03B—APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR
    • G03B21/00—Projectors or projection-type viewers; Accessories therefor
    • G03B21/14—Details
    • G03B21/20—Lamp housings
    • G03B21/2066—Reflectors in illumination beam

Definitions

  • the present invention relates to the field of illumination and display technology, and more particularly to a compact light source system.
  • laser light source is being gradually applied to various fields such as illumination and projection.
  • the light source using the laser excitation phosphor technology has the advantages of small optical expansion, high brightness, long life, and the like, and has attracted widespread attention.
  • Figure 1 shows a prior art source system utilizing laser-excited phosphor technology.
  • the light source system includes an excitation source 110, a heat sink 120, a first mirror 130, a collimating lens 140, a collecting lens 150, a phosphor layer 160, and a second mirror 170.
  • the excitation source 110 The laser diode is soldered to the heat sink 120, which is used to dissipate heat.
  • the excitation light 180 generated by the excitation light source 110 is incident on the first mirror 130 first. It is reflected by it, and the reflected light is then transmitted through the collimator lens 140 and the collecting lens 150, and finally incident on the phosphor layer 160.
  • Phosphor layer 160 is coated on second mirror 170 On.
  • the excitation light is incident from the front surface of the phosphor layer 160 and is converted into a laser light emission of another wavelength range.
  • the function of the mirror 170 is to reflect the light output backwards back to the front surface.
  • the outgoing output light 190 includes a laser that is absorbed and converted by the phosphor layer and residual excitation light that is not absorbed by the phosphor layer, and the output light 190 passes through the lenses 150 and 160.
  • the collection and collimation are finally emitted from the periphery of the mirror 130.
  • the mirror 130 is in the output beam path, so it blocks some of the output light, but because of its small area, this part of the light can be ignored.
  • FIG 2 shows another light source system using laser excitation phosphor technology in the prior art.
  • the light source system includes an excitation light source 210, a heat sink 220, a first mirror 230, a collimating lens 240, a collecting lens 250, a phosphor layer 260, and a second mirror 270.
  • the excitation source 210 The laser diode is bonded to the heat sink 220, and the heat sink 220 is used to dissipate heat. It differs from the light source system shown in Figure 1 in that the small mirror 130 in Figure 1 is replaced with an opening.
  • the mirror 230 of the 231 at this time, the excitation light 280 emitted from the excitation light source 210 is incident on the phosphor layer 260 through the opening 231.
  • the front surface while the laser light exiting from the phosphor layer and the remaining excitation light that is not absorbed will combine the output light 290, collected and collimated by lenses 250 and 240, and finally mirrored 230 Reflected output.
  • the opening 231 leaks part of the output light, it is negligible because of its small area.
  • the final output light is the mixed light of the excitation light and the laser.
  • the spectroscopic device such as a small mirror in the light source system
  • a monolithic spectroscopic filter as shown in FIG.
  • the spectroscopic filter reflects the excitation light and transmits the laser light;
  • the spectroscopic filter transmits excitation light and reflects the laser light.
  • the excitation light emitted from the excitation light source must pass through the optical components such as the collecting lens and the collimating lens before being incident on the phosphor, resulting in the phosphor.
  • the optical path between the excitation source and the phosphor layer is too long, and the volume of the spectroscopic device placed must be considered, making the entire system bulky.
  • the excitation light power is large, it is also necessary to separately design heat dissipation of the excitation light source and the phosphor.
  • the problem to be solved by the present invention is to simplify the structure of the light source system of the laser-excited phosphor, thereby reducing the volume of the light source system; and optimizing the heat dissipation design of the excitation light source and the phosphor layer, the entire light source system is more compact.
  • an embodiment of the present invention provides a compact light source system, including:
  • a first excitation light source for emitting the first excitation light
  • a first mirror for reflecting the first excitation light emitted by the first excitation light source
  • a wavelength conversion layer for absorbing the first excitation light to emit the laser light comprising an opposite first surface and a second surface, wherein the first surface is configured to receive the first excitation light reflected by the first mirror, and the first An excitation light or a mixed light of the first excitation light and the laser light is emitted;
  • a second mirror located on the second surface of the wavelength conversion layer, for reflecting the laser light generated by the wavelength conversion layer
  • a collimating lens having a first surface facing the wavelength conversion layer for receiving the exiting light of the collecting lens and collimating it;
  • the first excitation light source and the wavelength conversion layer are located on the same side of the first surface of the collimating lens, the first mirror is fixed on the first surface of the collimating lens, and the outgoing light in the collecting lens is in the collimating lens Within the range of spots formed by a surface.
  • the first mirror of the present invention functions as an original spectroscopic device, but the volume occupied by the original spectroscopic device is omitted, and the excitation light source and the phosphor layer are disposed on the collimating lens. On the side, the distance between them is no longer limited by the collecting lens and the collimating lens, so that the volume of the entire light source system is greatly reduced.
  • FIG. 1 is a schematic structural view of a light source system of a laser-excited phosphor in the prior art
  • FIG. 2 is a schematic structural view of another light source system for laser-excited phosphor in the prior art
  • FIG. 3a is a schematic structural view of a first embodiment of a light source system according to the present invention.
  • FIG. 3b is another schematic structural view of the first embodiment of the light source system of the present invention.
  • FIG. 4a is a schematic structural view of a second embodiment of a light source system according to the present invention.
  • 4b is another schematic structural view of a second embodiment of the light source system of the present invention.
  • 4c is another schematic structural view of a second embodiment of the light source system of the present invention.
  • Figure 5 is a schematic structural view of a third embodiment of the light source system of the present invention.
  • FIG. 6a is a schematic structural view of a fourth embodiment of a light source system according to the present invention.
  • 6b is another schematic structural view of a fourth embodiment of the light source system of the present invention.
  • Fig. 3a is a schematic structural view of a first embodiment of a light source system of the present invention.
  • the light source system includes an excitation source 310
  • Collimating lens 340 There is a first surface 341 facing the phosphor layer 360.
  • the excitation light source 310 and the phosphor layer 360 are disposed on the same side of the first surface 341 of the collimating lens 340, and the first mirror 330 It is fixed on the first surface 341.
  • the collection lens 350 is located between the collimating lens 340 and the phosphor layer 360.
  • the excitation light source 310 is tilted and fixed to emit the excitation light 380.
  • the optical axis of the collimator lens 340 is tilted to ensure that the excitation light 380 emitted from the excitation light source 310 can be incident on the first mirror 330 and reflected to the phosphor layer 360.
  • the excitation source 310 is fixed (most commonly soldered) on the heat sink 320, and the heat sink 320 Used to dissipate heat.
  • the first mirror 330 is fixed to the first surface 341 of the collimating lens 340 for reflecting the excitation light 380 emitted from the excitation light source 310 to the phosphor layer 360. , so it should be in a suitable position: the position must be at the first surface of the collimating lens 340 from the exiting light of the collecting lens 350 341 Within the range of spots formed above.
  • the full-angle illumination emitted from the phosphor layer 360 can be irradiated to the first mirror 330, then there must be an optical path so that the first mirror is passed through.
  • the reflected excitation light of 330 can also be incident on the phosphor layer 360. Since the first mirror 330 is located in the light path of the output light, the phosphor layer 360
  • the output light (including the laser and the remaining excitation light not absorbed by the phosphor layer) is partially incident on the first mirror 330 Above, the portion of the light will be reflected and cannot be outputted.
  • the area of the first mirror 330 must be designed to be sufficiently small; at the same time, to ensure the first mirror 330
  • the excitation light 380 emitted from the excitation light source 310 can be reflected to the utmost extent, and its area cannot be too small. Therefore, the size of the first mirror 330 should be compromised, and a light source with a small amount of optical expansion is selected as the excitation light source.
  • the excitation source 310 is a laser diode
  • the first mirror 330 is sized to reflect exactly all of the excitation light emerging from the laser diode.
  • the first mirror is provided 330 is located at the edge of the spot range formed by the light emerging from the collection lens 350 on the first surface 341 of the collimating lens 340 such that the excitation light emitted by the excitation source 310 380 After being reflected by the first mirror 330, it is incident on the collecting lens 350 at an incident angle as large as possible, and finally incident on the phosphor layer 360 at an incident angle as large as possible.
  • the advantage of this layout is because of the layer from the phosphor
  • the intensity distribution of the light emitted by 360 in space will roughly exhibit the Lambertian cosine distribution: the intensity at the center normal is the strongest, and the greater the angle, the weaker the light intensity, fixing the first mirror 330 to the collecting lens 350.
  • the emitted light is on the first surface of the collimating lens 340 341
  • the edge of the spot range formed on the upper surface can minimize the light intensity blocked by the mirror and reduce the loss of output light, thereby improving the efficiency of the output light.
  • the collection lens 350 functions to collect from the phosphor layer 360 Output the light and reduce its divergence angle.
  • the collection lens 350 should be located in front of the phosphor layer 360 and in close proximity to the phosphor layer.
  • the collection lens 350 For the meniscus lens, the concave surface faces the phosphor layer 360, which has the advantage of: from the phosphor layer 360
  • the incident angle of the emitted light incident on the concave surface is smaller than the incident angle incident on the plane or the convex surface, so the Fresnel reflection loss is small and the transmittance is high.
  • the radius of curvature of the concave surface should be greater than the radius of curvature of the convex surface.
  • the collimating lens 340 is located on the optical path of the output light 390 and is located behind the collecting lens 350.
  • the light exiting 350 is collimated and has a first surface 341 facing the phosphor layer 360.
  • the first surface 341 is planar, so that the first reflection 330 can be conveniently performed. Paste on it.
  • the first mirror 330 can also pass through the first surface 341 of the collimating lens 340.
  • the reflective film is used to achieve: other areas that do not need to be coated are covered with a jig, and the reflective film is only plated in a small partial area.
  • its disadvantage is that the output of the coating is low, and the cost is high.
  • the excitation light source 310 is obliquely fixed relative to the second mirror such that it emits the excitation light 380. It is obliquely incident on and reflected by the first mirror 330, and the reflected light passes through the collecting lens 350 and is incident on the phosphor layer 360. Phosphor layer 360 absorbs excitation light 380 And partially converting it into a laser, and the converted laser light and the excitation light synthesized by the phosphor are used to synthesize the output light 390 from the surface of the phosphor layer 360.
  • the phosphor layer 360 The back side is attached to the second mirror 370, so that the light output from the back surface of the phosphor layer is reflected back to the phosphor layer and finally outputted from the front surface.
  • Second mirror 370 Preferably, the surface is a silver-plated metal substrate, including an aluminum substrate, a copper substrate, etc., and the metal substrate has a relatively high hardness and a high thermal conductivity, which is advantageous for heat dissipation of the phosphor layer 360.
  • the first mirror 330 It can also be replaced by a spectroscopic filter that reflects the excitation light and transmits the laser, so that there is no first mirror 330 due to the laser being received.
  • the loss of laser light caused by occlusion can further improve the output light efficiency.
  • the first mirror 330 is a spectral filter
  • its area can be designed to be sufficiently large, for example, to completely cover the first surface of the collimating lens 340. 341, such that each portion of the output light 390 must exit through the spectroscopic filter.
  • the spectroscopic filter reflects the excitation light and transmits the characteristics of the laser, so that the output light 390 Only the laser component is contained, which is equivalent to filtering the output light 390; and some of the reflected light that is reflected back is again incident on the phosphor layer 360 and reused.
  • the phosphor layer 360 and the excitation light source 310 can be made. Sharing a heat sink simplifies the thermal design of the entire system, further reducing the system size, as shown in Figure 3b.
  • Figure 3b differs from Figure 3a in that the excitation source 310 and the second mirror are The 370 is fixed to the same heat sink 320 by a heat transfer medium 321 .
  • the thermally conductive medium is made of a high thermal conductivity material and is designed with a sloped bevel to ensure that the exiting light from the excitation source 310 is relative to the collimating lens
  • the optical axis of 340 is tilted.
  • the heat transfer medium 321 is not essential, and the excitation light source 310 and the second mirror 370 can be directly soldered to the heat sink 320.
  • the phosphor layer 360 It can also be driven by the driving device to periodically move, so that the local phosphor can be prevented from being excited and overheated for a long time to cause thermal quenching.
  • the phosphor layer 360 can be It is coated on a rotatable substrate (which may be the second mirror described above) which is rotated at a high speed by a driving device such as a motor to help dissipate the phosphor.
  • the phosphor layer 360 It can also be replaced with other wavelength converting materials, such as quantum dot materials or fluorescent dyes, etc., as long as it can absorb the excitation light and generate a laser, which is a common knowledge of those skilled in the art and should also be included in the protection of the present invention. Within the scope.
  • the first mirror 330 is opposite to the prior art. It functions as the original spectroscopic device, but the volume occupied by the original spectroscopic device is eliminated, and the excitation light source 310 and the phosphor layer 360 are located at the collimating lens 340. On the same side, the distance between them is no longer limited by the collecting lens and the collimating lens, so that the volume of the entire light source system is greatly reduced.
  • the excitation light source in order to reflect the excitation light emitted from the excitation light source to the phosphor layer by using the first mirror, the excitation light source is tilted and fixed so that the emitted light is inclined with respect to the optical axis of the collimating lens; In an embodiment, the excitation source is always vertically fixed, and the exiting light is kept parallel with respect to the optical axis of the collimating lens.
  • the light source system includes an excitation source 410
  • collimating lens 440 is a plano-convex lens
  • the first surface 441 facing the phosphor layer 460 is a plane
  • the excitation light source 410 and the phosphor layer 460 are disposed on the same side of the first surface 441, and the excitation light source 410 And the second mirror 470 is fixed on the same heat sink 420.
  • the first mirror 430 is fixed on the first surface 441 and is located at the first surface of the light emitted from the collecting lens 450. Within the range of spots formed on 441.
  • the collection lens 450 is located between the collimating lens 440 and the phosphor layer 460 and in close proximity to the phosphor layer 460.
  • the excitation light source 410 is vertically fixed on the heat sink 420 in order to make the excitation light source
  • the exiting excitation light 480 of 410 can be obliquely incident on the first mirror 430, and a prism 431 is disposed between the excitation light source 410 and the first mirror, as shown in Fig. 4a.
  • the prism 431 is located in the outgoing light path of the excitation light 480 and functions to deflect the excitation light 480 to be incident on the first mirror 430.
  • optical elements that achieve optical path deflection to meet the requirements, including lenses, mirrors, and the like.
  • the advantage of this structure is that the excitation light source can be vertically fixed on the heat sink, the installation is more convenient, the heat sink is easier to process, and the cost is lower.
  • the disadvantage is that additional optical components are required to achieve deflection of the excitation light, and the fixing and adjustment of the deflection optical element can make the light source system more complicated.
  • the first mirror can also be tilted so that the normal of the first mirror is tilted relative to the optical axis of the collimating lens, such as Figure 4b shows.
  • Figure 4b differs from FIG. 4a in that the collimating lens 440 is a meniscus lens that is concave toward the first surface 441 of the phosphor layer 460.
  • the first mirror 430 is fixed to the first surface 441 Above, and in the range of spots formed by the light emerging from the collecting lens 450 on the first surface 441.
  • the optical axis will have a certain tilt which is capable of reflecting the excitation light 480 which is emitted vertically upward to the phosphor layer 460.
  • Disadvantages of this configuration are: limitations on the position of the excitation source 410 and the collimating lens
  • the curvature of the first surface 441 of the 440 is more stringent, and the excitation light 480 that is vertically upwardly emitted from the excitation light source 410 is ensured to pass through the first mirror 430.
  • the present light source system configuration requires that the size of the collimating lens 440 is sufficiently large relative to the front light source system, and that the excitation light source 410 and the second mirror are The distance between 470 is small enough to ensure that excitation light 480 exiting vertically from excitation source 410 can be incident into collimating lens 440.
  • FIG. 4c Another structure for implementing vertical mounting of the excitation source is shown in Figure 4c.
  • a collimating lens 440 Still being a plano-convex lens, the first surface 441 facing the phosphor layer 460 is planar, but it differs from FIG. 4a in that it corresponds to the excitation light 480 on the first surface 441.
  • the incident portion is provided with a groove 442 having a slanted inner surface, and the first mirror 430 is fixedly fixed on the inclined inner surface thereof to form a certain inclination angle which can vertically upwardly enter the excitation light.
  • 480 is reflected to the phosphor layer 460.
  • the present light source system also requires that the size of the collimating lens 440 is sufficiently large, and the excitation source 410 and the second mirror 470 The distance between them is small enough to ensure that the excitation light 480 emerging vertically upward from the excitation light source 410 can be incident into the collimating lens 440.
  • the phosphor layer 460 It is also possible to keep stationary or moving, and this change is identical to the first embodiment and will not be described again.
  • excitation light source can be mounted vertically on the heat sink, and the light source layout is more conducive to volume reduction.
  • the excitation light source can also share a heat sink with the phosphor layer, making the design of the heat sink and the fixing of the excitation light source simpler.
  • Figure 5 A schematic structural view of a third embodiment of the light source system of the present invention.
  • the difference between the first embodiment and the first embodiment is that the excitation light source in the first embodiment is replaced by an excitation light source group, and the excitation light source group includes a plurality of independent excitation light sources respectively disposed on the collimating lens.
  • the first mirror group 530 there is a first mirror group 530, the first mirror group 530 It is composed of a plurality of mirrors, and the number of mirrors is the same as the number of excitation light sources included in the excitation light source group, ensuring that each excitation light source corresponds to one mirror, and the mirror can excite the corresponding excitation light source.
  • Light 580 Reflected onto the phosphor layer 560.
  • the first mirror group 530 When there are many mirrors included, all the mirrors can be connected together to form an axisymmetric reflection structure.
  • the reflective structure can be located at the edge or center of the first surface of the collimating lens.
  • the collimating lens 540 In the configuration shown in FIG. 5, the collimating lens 540 is a plano-convex lens facing the first surface 541 of the phosphor layer 560. In the plane, a conical projection is designed in the center of the plane, and a reflective film is formed on the surface of the conical projection to form a central reflection structure.
  • the central reflective structure 530 can emit excitation light 580 from four weeks. Reflected down to the phosphor layer 560. Of course, the light emitted from the phosphor layer 560 is also partially blocked by the central reflective structure 530 and cannot be emitted, but as long as the reflective structure 530
  • the area of the collection lens 550 is at the first surface of the collimating lens 540 541. The area of the spot formed on the surface is much smaller, and the loss of output light caused by it is negligible.
  • This integrated design not only eliminates the inconvenience of fixing the first mirror, but also makes the fixed position of the excitation light source more flexible: due to the reflective structure
  • the circumferential symmetry of 530 eliminates the need to consider the angle of incidence of the excitation source in the circumferential direction about the optical axis of the collimating lens.
  • the advantage of the embodiment is that the brightness of the light source can be further improved due to the set of excitation light sources composed of a plurality of excitation light sources, and at the same time, the first mirror is arranged as an integral reflective structure to excite The fixed position of the light source is more flexible, and the entire light source system is more compact and compact.
  • Figure 6a is a schematic view showing the structure of a fourth embodiment of the light source system of the present invention.
  • the difference between this embodiment and the first embodiment is that the phosphor layer
  • the 660 has an opposite first surface 661 and a second surface 662, and the second surface 662 is provided with a second mirror 671 at which the second mirror 671 Further disposed below is a second excitation light source 670.
  • the second mirror 671 can transmit the second excitation light emitted by the second excitation light source 670 and reflect the phosphor layer 660.
  • the emitted laser light is transmitted.
  • the first excitation light 680 emitted by the first excitation light source 610 is reflected by the first mirror 630 and then transmitted through the collection lens 650 from the first surface of the phosphor layer 660.
  • the second excitation light emitted from the second excitation light source 670 is transmitted through the second mirror 671 and then incident on the phosphor layer from the second surface 662 of the phosphor layer 660, so the phosphor layer Both surfaces of 660 will be excited to emit light at the same time.
  • the second mirror 671 can reflect the laser light emitted from the phosphor, the final laser will only be from the upper surface of the phosphor layer 660. Exit.
  • the first excitation light source 610 is set as a laser diode
  • the second excitation light source 670 is set as a laser diode or
  • the LED, phosphor layer 660 is applied directly to the surface of the laser diode or LED, which further eliminates the presence of the second mirror 671, as shown in Figure 6b.
  • the laser diode or LED as the second excitation light source has an active region 671, and under the active region 671 is a substrate 672, and a mirror surface is formed between the active region 671 and the substrate 672. 673, the mirror 673 acts as a second mirror in FIG. 6a for reflecting light emerging from the second surface 662 of the phosphor layer 660 back to the first surface of the phosphor layer 660
  • the 661 exits such that all of the light is output from the first surface 661 of the phosphor layer 660.
  • the first excitation light emitted from the first excitation light source 610 and the second excitation light source 670 The wavelength of light emitted by the second excitation light may be the same or different.
  • the second surface 662 of the phosphor layer 660 may be further A spectroscopic filter is disposed, the filter reflecting the first excitation light and the received laser light while transmitting the second excitation light.
  • the phosphor layer may be set to be stationary or moving, and the first excitation source and the second excitation source may share a heat dissipation device for heat dissipation design, and have the same beneficial effects as the previous embodiment.
  • the phosphor is excited from both sides of the phosphor layer at the same time, and the luminous intensity per unit area of the phosphor is further increased with respect to the case of the single-sided excitation phosphor, thereby making the output brightness higher.
  • the first mirror is fixed on the first surface of the collimating lens
  • the mirror can be fixed away from the surface of the collimating lens by a certain distance, and the same does not change.
  • the volume of the entire light source system is only required to add additional fixtures, and the effect is not as good as fixing directly on the collimating lens.

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Multimedia (AREA)
  • Optics & Photonics (AREA)
  • Spectroscopy & Molecular Physics (AREA)
  • Semiconductor Lasers (AREA)
  • Non-Portable Lighting Devices Or Systems Thereof (AREA)
  • Microscoopes, Condenser (AREA)

Abstract

La présente invention concerne un système de source lumineuse utilisant un laser pour exciter la poudre fluorescente comprenant : une première source lumineuse d'excitation (310, 410, 610), un premier miroir (330, 430, 530, 630), une lentille de collecte (350, 450, 550, 650), une électrode de collimation (340, 440, 540, 640), une couche de poudre fluorescente (360, 460, 560, 660), et un second miroir (370, 470, 570, 670). La couche de poudre fluorescente (360, 460, 560, 660) est revêtue sur le second miroir (370, 470, 570, 670), l'électrode de collimation (340, 440, 540, 640) présente une première surface orientée vers la couche de poudre fluorescente (360, 460, 560, 660), le premier miroir (330, 430, 530, 630) est situé sur la première surface, et la première source lumineuse d'excitation (310, 410, 610) et la couche de poudre fluorescente (360, 460, 560, 660) sont situées sur le même côté de l'électrode de collimation (340, 440, 540, 640). Ce système de source lumineuse présente une petite taille, une structure compacte et est conçu pour dissiper facilement la chaleur.
PCT/CN2014/071522 2013-02-05 2014-01-27 Système de source lumineuse avec structure compacte WO2014121707A1 (fr)

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CN201310046130.4A CN103969934B (zh) 2013-02-05 2013-02-05 一种结构紧凑的光源系统

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CN103969934A (zh) 2014-08-06

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