CN114063375B - Light source system - Google Patents
Light source system Download PDFInfo
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- CN114063375B CN114063375B CN202010796233.2A CN202010796233A CN114063375B CN 114063375 B CN114063375 B CN 114063375B CN 202010796233 A CN202010796233 A CN 202010796233A CN 114063375 B CN114063375 B CN 114063375B
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- 238000006243 chemical reaction Methods 0.000 claims abstract description 138
- 230000005284 excitation Effects 0.000 claims abstract description 124
- 239000000758 substrate Substances 0.000 claims abstract description 77
- 239000000463 material Substances 0.000 claims abstract description 66
- 230000003287 optical effect Effects 0.000 claims abstract description 39
- 230000003595 spectral effect Effects 0.000 claims description 15
- 239000002184 metal Substances 0.000 claims description 3
- 238000007493 shaping process Methods 0.000 claims description 3
- 238000010586 diagram Methods 0.000 description 7
- 238000000034 method Methods 0.000 description 6
- 230000000694 effects Effects 0.000 description 5
- 239000003086 colorant Substances 0.000 description 3
- 230000017525 heat dissipation Effects 0.000 description 3
- 230000005855 radiation Effects 0.000 description 3
- 230000006978 adaptation Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000005494 condensation Effects 0.000 description 1
- 238000009833 condensation Methods 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
- 239000013307 optical fiber Substances 0.000 description 1
- 238000013021 overheating Methods 0.000 description 1
- 230000000750 progressive effect Effects 0.000 description 1
Classifications
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- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03B—APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR
- G03B21/00—Projectors or projection-type viewers; Accessories therefor
- G03B21/14—Details
- G03B21/20—Lamp housings
- G03B21/2006—Lamp housings characterised by the light source
- G03B21/2033—LED or laser light sources
- G03B21/204—LED or laser light sources using secondary light emission, e.g. luminescence or fluorescence
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- G—PHYSICS
- 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
- G03B21/2053—Intensity control of illuminating light
Abstract
The invention discloses a light source system, which comprises an excitation light source, a wavelength converter and a focusing element; the wavelength converter comprises a substrate, wherein the substrate at least comprises a wavelength conversion region, and the surface of the wavelength conversion region is provided with a wavelength conversion material layer; the wavelength conversion region is provided with a concave surface on the surface of the wavelength conversion material layer; the excitation light source is used for outputting excitation light to the wavelength conversion region of the substrate; the wavelength conversion material layer is used for generating excited light by excitation light on the concave surface of the wavelength conversion region; the focusing element is arranged on the output light path of the wavelength converter and is used for converging and outputting the light output by the wavelength converter. In the light source system, the surface of the wavelength conversion region is set to be a concave surface structure, so that the concentration degree of the excited light output by the wavelength converter is improved, the surface area of the wavelength conversion layer is increased under the condition that the optical expansion amount is kept unchanged, and the light efficiency of the wavelength converter in the light source system is further increased.
Description
Technical Field
The invention relates to the technical field of optics, in particular to a light source system.
Background
The wavelength converter is provided with a wavelength conversion material, and the wavelength conversion material can generate excited light with different wavelengths from the excitation light after receiving the excitation light. Phosphor is one of the most common wavelength conversion materials. Wavelength converters are commonly used as light source systems for various light machines such as automobile lamps and projectors, and output light rays with different colors are obtained by adopting different wavelength conversion materials.
A conventional wavelength converter includes a substrate and a layer of wavelength converting material disposed on a planar surface of the substrate. The wavelength conversion material layer can radiate excited light outwards when irradiated by excitation light, but because the wavelength conversion material layer is lambertian, the generated excited light is outwards scattered at 180 degrees.
Disclosure of Invention
The invention aims to provide a light source system, which solves the problem that a wavelength converter needs to converge excited light through a condensing lens and improves the working efficiency of the light source system for outputting the excited light.
In order to solve the technical problems, the present invention provides a light source system, including an excitation light source, a wavelength converter and a focusing element;
the wavelength converter comprises a substrate, wherein the substrate at least comprises a wavelength conversion region, and the surface of the wavelength conversion region is provided with a wavelength conversion material layer; the wavelength conversion region is provided with a concave surface on the surface of the wavelength conversion material layer;
the excitation light source is used for outputting excitation light to the wavelength conversion region of the substrate; the wavelength conversion material layer is used for generating excited light by excitation of the excitation light on the concave surface of the wavelength conversion region;
the focusing element is arranged on the output light path of the wavelength converter and is used for converging and outputting the light output by the wavelength converter.
Optionally, the concave surface of the wavelength conversion region is a surface having a concave-convex texture.
Optionally, the wavelength converting material layer is uniformly laid down at the concave surface thickness of the wavelength converting region.
Optionally, the concave surface of the wavelength conversion region is any one of an elliptical surface, a spherical surface, or a parabolic surface.
Optionally, an included angle between an optical axis of the concave surface of the wavelength conversion region and a plane in which the substrate is located is greater than 0 degrees and less than 90 degrees.
Optionally, the concave surface of the wavelength converting region is a side of a plate-like structure of the wavelength converter.
Optionally, the optical fiber wavelength converter further comprises a turntable connected with the substrate of the wavelength converter and used for driving the substrate of the wavelength converter to rotate.
Optionally, the number of the wavelength conversion regions on the wavelength converter is 1, and the light receiving angle of the focusing element is ∈150 degrees.
Optionally, the excitation light source is any one of blue laser, blue LED and ultraviolet light source.
Optionally, the wavelength converter further comprises a heat conducting medium layer;
the heat conducting medium layer is a medium layer capable of reflecting excited light and is arranged between the surface of the wavelength conversion region and the wavelength conversion material layer;
the substrate of the wavelength converter is a metal substrate or a light-transmitting substrate.
Optionally, the substrate is a light-transmitting substrate, and further includes a filter film layer disposed on a surface of the wavelength conversion region on a side receiving the excitation light, and capable of transmitting the excitation light and reflecting the excitation light.
Optionally, the substrate is a reflective substrate, and further comprises a light-splitting filter element arranged on the outgoing light path of the excitation light source;
the light-splitting filter element is an element which reflects the excitation light of the excitation light source and transmits the excited light of the wavelength conversion region, and is used for reflecting the excitation light of the excitation light source to the wavelength conversion region on the substrate and transmitting the excited light generated by the wavelength conversion region out;
or the light-splitting filter element is an element which is transmitted by the excitation light of the excitation light source and is excited and reflected by the wavelength conversion region, and is used for transmitting the excitation light to the wavelength conversion region and reflecting and emitting the excited light.
Optionally, the focusing element is a condensing lens group; the excitation light output by the excitation light source is emitted to the condensing lens group in an optical axis direction oblique to the condensing lens group and then enters a wavelength conversion region of the wavelength converter; excitation light generated by the wavelength conversion material layer of the wavelength converter is emitted from the condensing lens group in the optical axis direction of the condensing lens group;
and a reflector for deflecting and outputting the excited light is arranged on an output light path of the condensing lens group.
Optionally, a filter wheel, a shaping lens group and a light rod are arranged on the emergent light path of the reflector.
Optionally, the filter wheel is attached to the wavelength converter, and the wavelength converter and the center of the filter wheel are connected with the same driving motor.
Optionally, the device further comprises at least one light source part, wherein the wave band range of the light rays output by the light source part is different from the wave band range of the excited light output by the wavelength converter;
the output light path of the light source part is provided with a light splitting filter for combining the excited light of the wavelength converter and the light outputted by the light source part to output.
Optionally, the excitation light source includes a first excitation light source and a second excitation light source, wherein excitation light of the first excitation light source and excitation light of the second excitation light source respectively irradiate the wavelength conversion material layer from two different surfaces of the wavelength conversion material layer.
The light source system provided by the invention comprises an excitation light source, a wavelength converter and a focusing element; the wavelength converter comprises a substrate, wherein the substrate at least comprises a wavelength conversion region, and the surface of the wavelength conversion region is provided with a wavelength conversion material layer; the wavelength conversion region is provided with a concave surface on the surface of the wavelength conversion material layer; the excitation light source is used for outputting excitation light to the wavelength conversion region of the substrate; the wavelength conversion material layer is used for generating excited light by excitation light on the concave surface of the wavelength conversion region; the focusing element is arranged on the output light path of the wavelength converter and is used for converging and outputting the light output by the wavelength converter.
When the wavelength converter in the light source system is excited to emit light, the excited light is radiated outwards from the surface of the wavelength converter, namely the excited light is outwards dispersed based on the surface of the wavelength conversion region of the wavelength converter. The surface of the wavelength conversion region is set to be a concave surface, the working principle of the wavelength conversion region is similar to that of a concave reflecting mirror, the light path of light output by the concave surface is converged towards the optical axis of the concave surface, and the excited light is converged to a great extent, so that the light condensation function of the wavelength converter is realized. On the basis, the excited light is further converged through the light converging element, so that the brightness of the projection light spot can be effectively improved. When the projector is in the field, the surface area of the wavelength conversion layer can be increased on the premise of keeping the optical expansion amount unchanged, so that the light efficiency of the wavelength converter in the system is increased.
Drawings
For a clearer description of embodiments of the invention or of the prior art, the drawings that are used in the description of the embodiments or of the prior art will be briefly described, it being apparent that the drawings in the description below are only some embodiments of the invention, and that other drawings can be obtained from them without inventive effort for a person skilled in the art.
Fig. 1 is a schematic diagram of an optical path structure of a light source system according to an embodiment of the present disclosure;
fig. 2 is a schematic diagram of another optical path structure of the light source system according to the embodiment of the present application;
fig. 3 is a schematic view of another optical path structure of the light source system according to the embodiment of the present application;
fig. 4 is a schematic diagram of another optical path structure of the light source system according to the embodiment of the present application;
fig. 5 is a schematic view of another optical path structure of the light source system according to the embodiment of the present application;
fig. 6 is a schematic diagram of another optical path structure of the light source system according to the embodiment of the present application;
fig. 7 is a schematic view of another optical path structure of the light source system according to the embodiment of the present application;
fig. 8 is a schematic diagram of another optical path structure of the light source system according to the embodiment of the present application.
Detailed Description
In a light source system including a wavelength converter, a wavelength conversion material of the wavelength converter is generally laid on a planar surface of a substrate of the wavelength converter, and then the wavelength conversion material is irradiated by an excitation light source, so that the wavelength conversion material is excited to generate excited light after receiving energy of the excitation light. The wavelength conversion material of the excited light is lambertian, and the outward radiation direction of the excited light is 180-degree radiation around the wavelength conversion material, so that the utilization rate of the excited light is not high.
Therefore, in the conventional light source system, it is often necessary to cooperate with a condensing lens group, and to collect the excited light to a certain extent through the condensing lens group, so as to improve the utilization rate of the excited light and improve the light intensity of the excited light in a certain emitting direction.
In addition, in the conventional wavelength converter, the excited light emitted by the surface of the wavelength conversion material is emitted outwards in a 180-degree manner, and the converging effect of the condensing lens group on the light cannot be achieved by collecting the light in a 180-degree manner, and a common light collecting angle is about 160 degrees, so that part of the light cannot be effectively utilized, and the excited light which cannot be absorbed becomes stray light, so that the temperature in the optical engine rises.
Therefore, based on the characteristic that the excited light irradiates outwards, a technical scheme capable of solving the problem that the wavelength converter in the light source system diverges the radiation to be excited is provided to a certain extent, and the technical scheme of the application is described in the following specific embodiments.
In order to better understand the aspects of the present invention, the present invention will be described in further detail with reference to the accompanying drawings and detailed description. It will be apparent that the described embodiments are only some, but not all, embodiments of the invention. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
As shown in fig. 1 and fig. 2, fig. 1 is a schematic structural diagram of a light source system provided in an embodiment of the present application, and fig. 2 is another schematic structural diagram of a light source system provided in an embodiment of the present application, where the light source system includes:
an excitation light source 20, a wavelength converter 10, and a focusing element 30; the wavelength converter 10 comprises a substrate 11, the substrate 11 comprising at least one wavelength converting region, the surface of the wavelength converting region being provided with a layer 12 of wavelength converting material; the wavelength conversion region is provided with a concave surface of the wavelength conversion material layer 12;
the excitation light source 20 is configured to output excitation light to the wavelength conversion region of the substrate 11; the wavelength conversion material layer 12 is used for exciting light on the concave surface of the wavelength conversion region to generate excited light;
the excitation light source 20 may be any of a blue laser, a blue LED, and an ultraviolet light source.
The focusing element 30 is disposed on the output optical path of the wavelength converter 10 for converging and outputting the light outputted from the wavelength converter.
Since the wavelength-converting region surface is a concave surface, on which the wavelength-converting material layer 12 is disposed, the wavelength-converting material layer 12 may be a material layer of uniform or nearly uniform thickness, then the wavelength-converting material layer 12 disposed on the concave surface is also a concave material layer. As shown in fig. 1, the lambertian body light sources formed by exciting the excited light generated by the excitation light source 20 and excited by the excitation light source 20 overlap each other, and the distribution of the light energy radiated outwards is more concentrated on the optical axis (i.e. geometric symmetry axis) of the concave surface, so that the excited light is collected to a certain extent, and the working principle thereof can refer to the collection of the light by the concave reflector.
When excitation light is incident on the convergeable concave surface, the wavelength conversion material layer 12 is excited to generate excited light, which is not uniformly radiated in all directions but is more concentrated in the direction of the optical axis near the concave surface, although the angle at which the excited light diverges outward is 180 degrees. Accordingly, the condensing element 30 is further arranged to receive light, so that the effective utilization rate of the excited light can be improved to a certain extent, the problem of overlarge light spots is avoided, and the brightness of the light spots is improved.
Further, it is apparent that the surface area of the wavelength conversion region of the concave surface is larger for the wavelength conversion region of the concave surface and the wavelength conversion region of the plane surface are provided for the same size region on the substrate 11 of the wavelength converter 10; accordingly, the surface area of the wavelength conversion material layer 12 laid on the concave surface is larger, and the energy of the generated excited light is correspondingly increased when the excitation light source 20 irradiates. When the light source system is applied to the DLP projection system, the light source system can greatly improve the light spot brightness under the condition that the light spot size is unchanged, thereby meeting the optical expansion of the DMD chip and further improving the projection display effect.
As shown in fig. 1 and fig. 2, the concave surface of the wavelength conversion material layer 12 is a curved surface, and in practical application, the concave surface of the wavelength conversion region may be an ellipsoidal surface, a paraboloid surface, or other curved surfaces, or may be a non-curved surface or other concave surfaces, so long as the light-condensing effect can be achieved to a certain extent, which is not particularly limited in this application.
In addition, in order to further enhance the light condensing performance of the concave surface of the wavelength conversion region, as shown in fig. 3, fig. 3 is a schematic view of the light path structure of another light source system provided in the embodiment of the present application, the concave surface of the wavelength conversion region on the substrate 11 of the wavelength converter 10 may be configured to have a concave-convex texture, similar to the concave-convex texture in the rear light of a bicycle. The concave-convex texture can be triangular convex and concave grooves with alternately arranged cross sections, or can be concave-convex texture with other cross sections. The concave-convex texture can further improve the concentration degree of the output light path of the excited light generated by each position point of the concave surface to the optical axis of the concave surface, further improve the light gathering capability of the concave surface of the wavelength conversion region, further improve the surface area of the concave surface, namely increase the total area of the wavelength conversion material layer 12, further improve the brightness of the excited light output by the wavelength converter, and improve the working efficiency of the wavelength converter.
Further, the optical axis of the concave surface of the wavelength conversion region is perpendicular to the surface of the substrate 11 in fig. 2. In practical applications, referring to fig. 1, the concave surface may be disposed obliquely with respect to the surface of the substrate 11 of the wavelength converter 10, so that the optical axis of the concave surface forms an angle of 0 to 90 degrees with the surface of the substrate 11.
As shown in fig. 1, when the excitation light of the excitation light source 20 is incident perpendicular to the surface of the substrate 11, the light path of the collected excited light can be separated from the light path of the incident excited light to a certain extent due to the existence of the light path between the optical axis of the concave surface and the incident light, and the light path structure is simplified without separating the excitation light and the light path of the excited light by using an optical device similar to a spectral filter or the like.
Alternatively, for the wavelength conversion region, it is not necessarily disposed on both upper and lower surfaces of the wavelength converter 10, and as shown in fig. 1, it may be further disposed on a side surface of the substrate 11 of the wavelength converter 10, which may be an inclined side surface, a concave surface is formed on the inclined side surface, and the wavelength conversion material layer 11 is disposed on the concave surface. The excitation light may be incident on the wavelength conversion material layer 11 of the concave surface from the side of the wavelength converter 10, or may be incident from the direction perpendicular to the substrate 11 of the wavelength converter 1, and the direction in which the excitation light is converged and emitted is related to the direction in which the concave surface is inclined, which is not particularly limited in this application.
In summary, in the light source system disclosed in the application, the surface of the wavelength conversion region, on which the wavelength conversion material layer is disposed, of the wavelength converter is set to be a concave surface, so that a certain converging effect is generated on the excited light by the concave surface, and the light converging degree of the excited light is further improved by converging the excited light through the light converging element, so that the light spot brightness is favorable for wide application of the light source system.
Based on any of the embodiments described above, there are reflective wavelength converters and transmissive wavelength converters for the wavelength converter 10 in the light source system. Specific examples will be described below.
In the light source system in which the wavelength converter 10 is a reflective wavelength converter, the excitation light source is provided on the side of the substrate where the wavelength conversion region is provided, as shown in fig. 4. In this case, the substrate 11 may be a reflective substrate or a light-transmissive substrate.
If the substrate 11 is a light-transmitting substrate, a light-reflecting film layer 13 may be disposed on the concave surface of the wavelength-converting region of the substrate 11, and then a wavelength-converting material layer 10 may be disposed on the surface of the light-reflecting film layer 13, where the light-reflecting film layer 13 reflects only the excited light and transmits the excited light.
Naturally, in order to dissipate heat in the wavelength conversion region on the substrate 11, the reflective film layer 13 may be a heat conductive medium layer having light reflection and heat conduction functions, and the heat generated by the wavelength conversion material layer 12 may be conducted out through the heat conductive medium layer.
If the substrate 11 is a reflective substrate, such as a metal reflective substrate, the excited light generated by the wavelength conversion material layer 12 and radiated to the side away from the excitation light source 20 may be directly reflected by the substrate 11, so that all the excited light is radiated to the side of the excitation light source 20 to the greatest extent.
Of course, in order to dissipate heat from the wavelength conversion material layer 12, a heat transfer medium layer may be provided between the wavelength conversion material layer 12 and the concave surface.
In addition, in the reflective wavelength converter 10, since the excitation light and the excited light are incident and emitted from the same side of the substrate 11 such that the optical paths of the excitation light and the excited light overlap in space, the spectral filter element 40 may be provided between the excitation light source 20 and the wavelength converter 10.
As shown in fig. 3, the spectral filter 40 is a device that transmits excitation light from the excitation light source 20 and reflects excitation light from the wavelength conversion region. The spectral filter element 40 and the wavelength conversion region are both located on the optical axis of the excitation light source 20, the spectral filter element 40 transmits the excitation light to the wavelength conversion region, and the excited light enters the spectral filter element 40 and is reflected and emitted to separate the excitation light from the excited light.
As shown in fig. 4, the spectral filter 40 may be a component that reflects the excitation light from the excitation light source 20 and transmits the excitation light from the wavelength conversion region. The optical axis of the excitation light source 20 and the optical axis of the wavelength conversion region are perpendicular to each other, and the spectral filter element 40 is provided at the intersection position of the two optical axes. The excitation light outputted from the excitation light source 20 is incident on the spectral filter 40 and reflected to the wavelength conversion region of the substrate 11, and the excited light generated in the wavelength conversion region is directly emitted from the spectral filter 40.
For a transmissive wavelength converter, the excitation light source 20 is arranged on the side of the substrate 11 facing away from the wavelength converting region, as shown in fig. 5. In this case, the substrate 11 needs to be a light-transmitting substrate. In this case, the filter layer 14 may be provided on the substrate 11, and the filter layer 14 may reflect only the excitation light and project the excitation light, and the filter layer 14 may be provided between the concave surface of the wavelength conversion region and the wavelength conversion material layer 12, or may be provided on the surface of the substrate 11 facing the excitation light source 20.
Based on the above embodiments, the wavelength converter 10 operates in the same manner in each part, because the light source system can be applied to a plurality of different application scenarios, and is limited in space or otherwise required. For example, in a DLP projection system, the wavelength converter in the light source system is stationary during operation, and as shown in fig. 3-5, only one wavelength conversion region is included on the wavelength converter 10. The size of the wavelength conversion region can be reasonably set according to the requirement of the DMD chip on the optical expansion in the DLP projection system.
Of course, in the light source system of the present application, there may be a wavelength converter 10 that can work rotationally, as shown in fig. 1 and 2, the wavelength conversion regions of the wavelength converter 10 are distributed on the substrate 11 in a ring shape, the substrate 11 and the turntable 15 are attached to each other, and the turntable 15 can drive the substrate 11 to rotate with the center of the ring-shaped wavelength conversion region, so that, along with the rotation of the substrate 11, the light beams of the excitation light source 20 can sequentially irradiate different positions of the wavelength conversion region. In addition, the turntable 15 and the base plate 11 may be integrated in a single structure in order to simplify the structure of the light source system.
If the wavelength conversion region is provided with a plurality of different wavelength conversion material layers 12, the substrate can sequentially output excited light of different colors during the rotation operation. If the wavelength conversion material layers 12 disposed in the wavelength conversion region are identical, the wavelength conversion material layers 12 at each position can be sequentially excited along with the rotation of the substrate 11, so that overheating of the local wavelength conversion region can be effectively avoided. It will be appreciated that for an annular distribution of wavelength converting regions, the surface of the wavelength converting region should also be the surface of the annular inner groove.
An embodiment of a light source system is also provided herein, referring to fig. 6, in which the focusing element 30 is a condensing lens group; the excitation light outputted from the excitation light source 20 is directed to the condenser lens group in a direction inclined to the optical axis direction of the condenser lens group and then is incident to the wavelength conversion region of the wavelength converter 10; excitation light generated by the wavelength conversion material layer 12 of the wavelength converter 10 is emitted in the optical axis direction of the condensing lens group through the condensing lens group;
the output light path of the condensing lens group is provided with a reflecting mirror 50 for deflecting the excited light to be output.
As shown in fig. 6, the excitation light source 20 is obliquely incident to the wavelength conversion region with the concave surface of the wavelength converter 10 through the condensing lens group, and the excited light output by the wavelength conversion region is incident to the condensing lens group after being output, and because there is an inclination angle between the excited light and the excitation light, the excitation light beam and the excited light beam can be separated from each other at a spatial position, and then the reflection mirror 50 is disposed on the optical path of the excited light output by the condensing lens group, and the excited light can be reflected and output by the reflection mirror 50.
Further, a filter wheel 60, a shaping lens set 70, and a light rod 80 may be provided on the output light path of the reflector 50.
It can be understood that the wavelength converter 10 in this embodiment is a reflective wavelength converter, the substrate 11 may be a transparent substrate, and accordingly, a filter layer 15 that is transmissive to the excitation light and reflective to the excitation light is disposed between the surface of the wavelength conversion region and the wavelength conversion material layer 12, so that part of the excitation light that is not absorbed in the wavelength conversion region can be transmitted through the wavelength converter. A mirror assembly 90 may be further disposed on a side of the wavelength converter 10 facing away from the excitation light source 20, to reflect the unabsorbed excitation light onto the same optical path as the excited light, and to reflect the same from the mirror 50 as the excited light.
Since the filter wheel 60 and the wavelength converter 10 need to rotate synchronously, the filter wheel 60 and the wavelength converter can be attached to each other as shown in fig. 7, so that they share a driving motor, thereby simplifying the light path structure.
In another embodiment, as shown in fig. 8, the light source system includes an excitation light source 20, a wavelength converter 10, a light condensing element 30, and at least one light source 22, where the wavelength bands of the excited light output by the light source and the wavelength converter 10 are different. The light source 22 has a spectral filter 41 on its output optical path for combining the excited light of the wavelength converter 10 and the light beam output from the light source 22. The wavelength converter 10 is composed of a substrate 11 and a layer 12 of wavelength reflective material of a concave surface as described in any of the embodiments above.
As shown in fig. 8, in addition to the excitation light source 20 being focused and collimated and then irradiated to the wavelength converter 10 through the spectral filter 41, the light source device further includes two light source units 22, the two light source units 22 respectively output light beams of different colors, the light beams of different wave bands reflect the light emitted from the excitation light source 20 through the spectral filter 41, the excited light of the wavelength converter 10 is transmitted, and the light beams of the two light source units 22 are reflected at the same time, so that light combining of light beams of multiple wave bands can be realized.
Further, for the excitation of the wavelength converter 10 in the present embodiment, the excitation light source 20 may include a first excitation light source 201 and a second excitation light source 202, where the first excitation light source 201 irradiates the incident wavelength conversion material layer 12 after being reflected by the spectral filter 41, and the second excitation light source 202 directly transmits the incident wavelength conversion material layer 12 from the other surface of the wavelength converter 10, so as to enhance the light emitting efficiency of the wavelength conversion material layer 12; in order to avoid the excessive heat of the wavelength converter 10, a light-transmitting heat-conducting medium layer 14 may be disposed between the substrate 11 and the wavelength conversion material layer 12 of the wavelength converter 10, so as to facilitate heat dissipation.
Of course, it should be noted that, in the present embodiment, the wavelength converter 10 does not necessarily generate the excited light for the double-sided excitation, and the technical scheme of the present application can be implemented just by providing the excitation light source 20.
In addition, in order to further improve the heat dissipation effect of the light source system, the heat sinks 23 may be disposed on the light source portion 22 and the wavelength converter 10, so that it is beneficial to avoid that the working performance of the light source system is affected due to the excessively high temperature of the light source system in the working process. The concave surface of the wavelength converter 10 also helps to increase the heat dissipation area.
It is noted that relational terms such as first and second, and the like are used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Moreover, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements is inherent to. Without further limitation, an element defined by the phrase "comprising one … …" does not exclude the presence of other like elements in a process, method, article, or apparatus that comprises the element. In addition, the parts of the above technical solutions provided in the embodiments of the present application, which are consistent with the implementation principles of the corresponding technical solutions in the prior art, are not described in detail, so that redundant descriptions are avoided.
In this specification, each embodiment is described in a progressive manner, and each embodiment is mainly described in a different point from other embodiments, so that the same or similar parts between the embodiments are referred to each other. The principles and embodiments of the present invention have been described herein with reference to specific examples, the description of which is intended only to facilitate an understanding of the method of the present invention and its core ideas. It should be noted that it will be apparent to those skilled in the art that various modifications and adaptations of the invention can be made without departing from the principles of the invention and these modifications and adaptations are intended to be within the scope of the invention as defined in the following claims.
Claims (13)
1. A light source system comprising an excitation light source, a wavelength converter, and a focusing element;
the wavelength converter comprises a substrate, wherein the substrate at least comprises a wavelength conversion region, and the surface of the wavelength conversion region is provided with a wavelength conversion material layer; the wavelength conversion region is provided with a concave surface on the surface of the wavelength conversion material layer;
the excitation light source is used for outputting excitation light to the wavelength conversion region of the substrate; the wavelength conversion material layer is used for generating excited light by excitation of the excitation light on the concave surface of the wavelength conversion region;
the focusing element is arranged on the output light path of the wavelength converter and used for converging and outputting the light output by the wavelength converter;
the focusing element is a condensing lens group; the excitation light output by the excitation light source is emitted to the condensing lens group in an optical axis direction oblique to the condensing lens group and then enters a wavelength conversion region of the wavelength converter; the excited light generated by the wavelength conversion material layer of the wavelength converter is emitted from the condensing lens group in the optical axis direction of the condensing lens group;
a reflector for deflecting and outputting the excited light is arranged on an output light path of the condensing lens group;
the concave surface of the wavelength conversion region is any one curved surface of an elliptic surface, a spherical surface or a paraboloid; wherein the light energy of the excited light is concentrated at the optical axis output of the concave surface;
the wavelength converter further comprises a heat conducting medium layer;
the heat conducting medium layer is a medium layer capable of reflecting excited light and is arranged between the surface of the wavelength conversion region and the wavelength conversion material layer;
the substrate of the wavelength converter is a metal substrate or a light-transmitting substrate;
an included angle between an optical axis of the concave surface of the wavelength conversion region and a plane in which the substrate is located is greater than 0 degrees and less than 90 degrees.
2. The light source system of claim 1, wherein the concave surface of the wavelength-converting region is a surface having a concave-convex texture.
3. The light source system of claim 1, wherein the layer of wavelength converting material is uniformly laid down in thickness at the concave surface of the wavelength converting region.
4. The light source system of claim 1, wherein the concave surface of the wavelength-converting region is a side of a plate-like structure of the wavelength converter.
5. The light source system of claim 1, further comprising a turntable coupled to the substrate of the wavelength converter for rotating the substrate of the wavelength converter.
6. The light source system of claim 1, wherein the number of wavelength conversion regions on the wavelength converter is 1 and the focusing element receives an angle ∈ 150 degrees.
7. The light source system of claim 1, wherein the excitation light source is any one of a blue laser, a blue LED, and an ultraviolet light source.
8. The light source system according to claim 1, wherein the substrate is a light-transmitting substrate, and further comprising a filter layer provided on a side of the wavelength conversion region on which the excitation light is incident, the filter layer being transmissive to the excitation light and reflective to the excitation light.
9. The light source system of claim 1, wherein the substrate is a reflective substrate, further comprising a spectral filter element disposed on an exit light path of the excitation light source;
the light-splitting filter element is an element which reflects the excitation light of the excitation light source and transmits the excited light of the wavelength conversion region, and is used for reflecting the excitation light of the excitation light source to the wavelength conversion region on the substrate and transmitting the excited light generated by the wavelength conversion region out;
or the light-splitting filter element is an element which is transmitted by the excitation light of the excitation light source and is excited and reflected by the wavelength conversion region, and is used for transmitting the excitation light to the wavelength conversion region and reflecting and emitting the excited light.
10. The light source system of claim 1, wherein the reflector is provided with a filter wheel, a shaping lens set and a light rod on the exit light path.
11. The light source system of claim 10, wherein the filter wheel is mounted to the wavelength converter and the centers of the wavelength converter and the filter wheel are connected to the same drive motor.
12. The light source system according to any one of claims 1 to 11, further comprising at least one light source section, a wavelength band range of light outputted from the light source section and a wavelength band range of excited light outputted from the wavelength converter being different;
the output light path of the light source part is provided with a light splitting filter for combining the excited light of the wavelength converter and the light outputted by the light source part to output.
13. The light source system of claim 12, wherein the excitation light source comprises a first excitation light source and a second excitation light source, wherein excitation light of the first excitation light source and excitation light of the second excitation light source respectively illuminate the wavelength converting material layer from two different surfaces of the wavelength converting material layer.
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