CN114063375A - Light source system - Google Patents
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- CN114063375A CN114063375A CN202010796233.2A CN202010796233A CN114063375A CN 114063375 A CN114063375 A CN 114063375A CN 202010796233 A CN202010796233 A CN 202010796233A CN 114063375 A CN114063375 A CN 114063375A
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- 230000003287 optical effect Effects 0.000 claims abstract description 47
- 230000003595 spectral effect Effects 0.000 claims description 19
- 239000002184 metal Substances 0.000 claims description 3
- 238000007493 shaping process Methods 0.000 claims description 3
- 238000001914 filtration Methods 0.000 claims description 2
- 238000000034 method Methods 0.000 description 7
- 230000000694 effects Effects 0.000 description 4
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- 238000009833 condensation Methods 0.000 description 2
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- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 description 1
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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
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Abstract
The invention discloses a light source system, which comprises an excitation light source, a wavelength converter and a focusing element, wherein the excitation light source is provided with a first excitation light source and a second excitation light source; the wavelength converter comprises a substrate, wherein the substrate at least comprises a wavelength conversion area, and a wavelength conversion material layer is arranged on the surface of the wavelength conversion area; the surface of the wavelength conversion material layer arranged in the wavelength conversion region is a concave surface; the excitation light source is used for outputting excitation light to the wavelength conversion area of the substrate; the wavelength conversion material layer is used for being excited by the exciting light on the concave surface of the wavelength conversion area to generate excited light; the focusing element is arranged on the output optical path of the wavelength converter and used for converging and outputting the light output by the wavelength converter. The surface of the wavelength conversion area is arranged to be a concave surface structure in the light source system, the concentration degree of the output excited light of the wavelength converter is improved, the surface area of the wavelength conversion layer is increased under the condition that the optical expansion 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 wavelength from the excited light after receiving the irradiation of the excited light. Phosphor is one of the most common wavelength converting materials. Wavelength converters are commonly used in light source systems of various optical machines such as automobile lamps and projectors, and output lights of different colors are obtained by using 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 being irradiated by the exciting light, but because the wavelength conversion material layer is lambertian, the generated excited light is emitted outwards in a 180-degree divergence manner.
Disclosure of Invention
The invention aims to provide a light source system, which solves the problem that a wavelength converter needs to collect 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 above technical problem, the present invention provides a light source system, which includes 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 area, and a wavelength conversion material layer is arranged on the surface of the wavelength conversion area; the surface of the wavelength conversion material layer arranged in the wavelength conversion region is a concave surface;
the excitation light source is used for outputting excitation light to the wavelength conversion area of the substrate; the wavelength conversion material layer is used for being excited by the excitation light on the concave surface of the wavelength conversion area to generate excited light;
the focusing element is arranged on the output optical path of the wavelength converter and used for converging and outputting the light output by the wavelength converter.
Optionally, the concave surface of the wavelength converting region is a surface having a concave-convex texture.
Optionally, the wavelength converting material layer is laid uniformly in thickness on the concave surface 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 where the substrate is located is greater than 0 degree and smaller 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 apparatus further comprises a turntable connected to the substrate of the wavelength converter, and the turntable is 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 collection angle of the focusing element is ≧ 150 degrees.
Optionally, the excitation light source is any one of a blue laser, a blue LED, and an 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 where the excitation light is incident, the filter film layer being capable of transmitting the excitation light and reflecting the excitation light.
Optionally, the substrate is a reflective substrate, and further includes a light-splitting filter element disposed on an exit light path of the excitation light source;
the spectral 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 and emitting the excited light generated by the wavelength conversion region;
or the spectral filtering element is an element which transmits the excitation light of the excitation light source and reflects the excitation light of the wavelength conversion region, and is used for transmitting the excitation light to the wavelength conversion region and reflecting the excitation light to emit.
Optionally, the focusing element is a condenser lens group; exciting light output by the excitation light source is emitted to the condensing lens group in a direction inclined to the optical axis of the condensing lens group and then is emitted to the wavelength conversion area of the wavelength converter; excitation light generated by the wavelength conversion material layer of the wavelength converter is emitted out through the condensing lens group in the direction of the optical axis of the condensing lens group;
and a reflector for deflecting and outputting the excited light is arranged on an output light path of the condenser lens group.
Optionally, a light filter wheel, a shaping lens group, and a light rod are disposed on an emergent light path of the reflector.
Optionally, the filter wheel is attached to the wavelength converter, and the centers of the wavelength converter and the filter wheel are connected to the same driving motor.
Optionally, the wavelength converter further comprises at least one light source unit, wherein the wavelength range of the light output by the light source unit is different from the wavelength range of the excited light output by the wavelength converter;
and the light path output by the light source part is provided with a light splitting filter which is used for combining the excited light of the wavelength converter and the light output by the light source part for output.
Optionally, the excitation light sources include a first excitation light source and a second excitation light source, wherein the excitation light of the first excitation light source and the 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 invention provides 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 area, and a wavelength conversion material layer is arranged on the surface of the wavelength conversion area; the surface of the wavelength conversion material layer arranged in the wavelength conversion region is a concave surface; the excitation light source is used for outputting excitation light to the wavelength conversion area of the substrate; the wavelength conversion material layer is used for being excited by the exciting light on the concave surface of the wavelength conversion area to generate excited light; the focusing element is arranged on the output optical path of the wavelength converter and used for converging and outputting the light output by the wavelength converter.
When the wavelength converter in the light source system of the present application is irradiated by the excitation light, the excited light is output radially outwards from the surface of the wavelength converter, that is, the excited light is diverged outwards by taking the surface of the wavelength conversion area of the wavelength converter as a reference. The surface of the wavelength conversion area is set to be a concave surface, the working principle of the concave surface reflector is similar to that of a concave surface reflector, so that the light path of light output by the concave surface is converged towards the optical axis of the concave surface, the excited light is converged to a great extent, and the light condensation function of the wavelength converter is realized. On the basis, the excited light is further converged by the condensing element, and the brightness of the projection light spot can be effectively improved. When the projector is used in the field, the surface area of the wavelength conversion layer can be increased on the premise of keeping the optical expansion unchanged, and the light efficiency of the wavelength conversion layer in a system is further increased.
Drawings
In order to more clearly illustrate the embodiments or technical solutions of the present invention, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art that other drawings can be obtained based on these drawings without creative efforts.
Fig. 1 is a schematic diagram of an optical path structure of a light source system provided in an embodiment of the present application;
fig. 2 is a schematic view 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 view of another optical path structure of the light source system provided in the embodiment of the present application;
fig. 5 is a schematic view of another optical path structure of the light source system provided in the embodiment of the present application;
fig. 6 is a schematic view 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 view 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 substrate plane surface of the wavelength converter, and the wavelength conversion material is irradiated by a laser source, so that the wavelength conversion material receives energy of excitation light and is excited to generate excited light. The wavelength conversion material radiating the excited light is lambertian, and the direction of the outward radiation of the excited light is radiated to 180 sides by taking the wavelength conversion material as the center, so that the utilization rate of the excited light is not high.
Therefore, in a conventional light source system, a condensing lens group is often needed to be matched, the excited light is converged to a certain degree through the condensing lens group, the utilization rate of the excited light is improved, and the light intensity of the excited light in a certain emergent direction is improved.
In addition, in the conventional wavelength converter, the excited light emitted by the surface on which the wavelength conversion material is laid is emitted by 180 degrees, and the condensing lens group cannot collect light by 180 degrees, and the general light collecting angle is about 160 degrees, so that part of light cannot be effectively utilized, and the excited light which cannot be absorbed is changed into stray light, so that the temperature in the optical engine rises.
Therefore, the present application proposes a technical solution that can solve the problem of divergent radiation of excited light by a wavelength converter in a light source system to some extent based on the characteristic of the excited light radiating outward, and the technical solution of the present application will be described with specific embodiments below.
In order that those skilled in the art will better understand the disclosure, the invention will be described in further detail with reference to the accompanying drawings and specific embodiments. It is to be understood that the described embodiments are merely exemplary of the invention, and not restrictive of the full scope of the invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present 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 the light source system provided in the 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 at least comprises a wavelength conversion region, and the surface of the wavelength conversion region is provided with a wavelength conversion material layer 12; the surface of the wavelength converting material layer 12 in the wavelength converting region is a concave surface;
the excitation light source 20 is for outputting excitation light to the wavelength conversion region of the substrate 11; the wavelength conversion material layer 12 is used for generating excited light by excitation light on the concave surface of the wavelength conversion region;
the excitation light source 20 may be any one 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 output 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 layer of material having a uniform or nearly uniform thickness, and the wavelength material converting material layer 12 disposed on the concave surface is also a concave material layer. As shown in fig. 1, the excited light generated by the wavelength converting material layer 12 of the concave surface being irradiated by the excitation light of the excitation light source 20 is overlapped with each other by the lambertian light source formed by exciting the wavelength converting material of each point, and the light energy distribution radiated outwards is more concentrated on the optical axis (i.e. the geometric symmetry axis) of the concave surface, so as to collect the excited light to a certain extent, and the working principle can refer to the light collecting effect of the concave reflector.
When the excitation light is incident on the light-condensing concave surface, the wavelength conversion material layer 12 is excited to generate excited light, which is not radiated uniformly in all directions any more, but is more concentrated in the optical axis direction near the concave surface, although the angle of radiation of the excited light is 180 degrees. Correspondingly, the light condensing element 30 is arranged to receive light, so that the effective utilization rate of the excited light can be improved to a certain degree, the problem of overlarge light spots is avoided, and the brightness of the light spots is improved.
Further, providing the wavelength conversion region of the concave surface and the wavelength conversion region of the planar surface for the same size region on the substrate 11 of the wavelength converter 10 obviously has a larger surface area of the wavelength conversion region of the concave surface; 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 increased when the excitation light source 20 irradiates the surface. When the light source system is applied to the DLP projection system, the light source system can improve the light spot brightness to a great extent under the condition that the light spot size is unchanged, the optical expansion amount of the DMD chip is met, and then the projection display effect is improved.
As shown in fig. 1 and 2, the concave surface of the wavelength conversion material layer 12 in the wavelength conversion region is a curved surface, and in practical applications, the concave surface of the wavelength conversion region may be a curved surface such as an ellipsoid surface or a paraboloid surface, or may be a non-curved surface or other concave surface, as long as the concave surface can perform a light-gathering function to a certain extent, and the concave surface is not particularly limited in this application.
In addition, in order to further improve the light gathering performance of the concave surface of the wavelength conversion region, as shown in fig. 3, fig. 3 is a schematic view of the optical 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 as a surface with a concave-convex texture, similar to the concave-convex texture in the bicycle rear lamp. The concave-convex texture can be concave-convex texture with cross sections of other shapes, wherein the cross sections of the concave-convex texture and the convex-concave texture are triangular bulges and grooves which are alternately arranged. 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, so that the light condensation capacity of the concave surface of the wavelength conversion region is improved, the surface area of the concave surface is further improved, namely, the total area of the wavelength conversion material layer 12 is increased, the brightness of the excited light output by the wavelength converter is further improved, and the working efficiency of the wavelength converter is improved.
Further, the concave surface optical axis 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 wavelength converter 10 on which the substrate 11 is disposed, such that the optical axis of the concave surface and the surface on which the substrate 11 is disposed form an angle of 0 to 90 degrees.
As shown in fig. 1, for the reflective wavelength converter 10, when the excitation light of the excitation light source 20 enters perpendicularly to the surface of the substrate 11, the optical path of the converged excited light exiting can be separated from the optical path of the incident excitation light to a certain extent due to the existence of the optical axis of the concave surface and the incident light, and the optical paths of the excitation light and the excited light do not need to be separated by optical devices such as a spectral filter, so that the optical path structure is simplified.
Alternatively, it is not necessary for the wavelength conversion region to be disposed on both the 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 oblique side surface, on which a concave surface is formed, 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 surface 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 excited 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 present application, the surface of the wavelength conversion material layer disposed in the wavelength conversion region of the wavelength converter is configured as the concave surface, so that the concave surface generates a certain converging effect on the excited light, and the converging element converges the excited light to further improve the light converging degree and the light spot brightness of the excited light, which is beneficial to the wide application of the light source system.
Based on any of the embodiments described above, as the wavelength converter 10 in the light source system, there are a reflective wavelength converter and a transmissive wavelength converter. The following description will be given with reference to specific embodiments.
In the light source system in which the wavelength converter 10 is a reflection type 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 light-reflecting substrate or a light-transmitting 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 conversion region of the substrate 11, and then a wavelength conversion material layer 10 may be disposed on the surface of the light-reflecting film layer 13, and the light-reflecting film layer 13 only reflects the excitation light and transmits the excitation light.
Of course, in order to dissipate heat from the wavelength conversion region on the substrate 11, the reflective film layer 13 may use a heat conductive medium layer having light reflecting and heat conducting functions, and the heat generated by the wavelength conversion material layer 12 is 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 can 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 maximum extent.
Of course, a layer of thermally conductive medium may also be provided between the wavelength converting material layer 12 and the concave surface in order to dissipate heat from the wavelength converting material layer 12.
In addition, since in the wavelength converter 10 of the reflection type, the excitation light and the excited light are incident and emitted from the same side of the substrate 11 so that the optical paths of the excitation light and the excited light coincide 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 transmits excitation light of the excitation light source 20 and reflects the excitation light in 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 incident on the spectral filter element 40 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 device that reflects the excitation light of the excitation light source 20 and transmits the excitation light of the wavelength conversion region. The optical axes of the excitation light source 20 and the wavelength conversion region are perpendicular to each other, and the spectral filter element 40 is disposed at the intersection of the two optical axes. The excitation light output from the excitation light source 20 enters the spectral filter element 40 and is 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 element 40.
For a transmissive wavelength converter, the excitation light source 20 is arranged on the side facing away from the substrate 11 where the wavelength conversion region is arranged, as shown in fig. 5. In this case, the substrate 11 needs to be provided with a light-transmitting substrate. At this time, the filter layer 14 may be provided on the substrate 11, and the filter layer 14 reflects only the excited light and projects the excited light, but of course, 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 light source system can be applied to a variety of different application scenarios, and the wavelength converter 10 works in the same manner for each part due to space limitation or other requirements. For example, in DLP projection systems, in which the wavelength converter is stationary during operation, the wavelength converter 10, as shown in fig. 3 to 5, also comprises only one wavelength conversion region. The size of the wavelength conversion area can be set reasonably according to the requirement of a DMD chip in a DLP projection system on the optical expansion.
Of course, in the light source system of the present application, there may also be a wavelength converter 10 capable of rotating, as shown in fig. 1 and fig. 2, the wavelength conversion regions of the wavelength converter 10 are distributed on the substrate 11 in an annular shape, the substrate 11 is attached to the turntable 15, and the turntable 15 can drive the substrate 11 to rotate around the center of the annular wavelength conversion region, so that the light beams of the excitation light source 20 can sequentially irradiate different positions of the wavelength conversion regions along with the rotation of the substrate 11. In addition, the turntable 15 and the substrate 11 may be integrated into 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 in the rotating process. If the wavelength conversion material layers 12 disposed in the wavelength conversion regions are the same, the wavelength conversion material layers 12 at the respective positions can be sequentially excited with the rotation of the substrate 11, and thus the local wavelength conversion regions can be effectively prevented from being overheated. 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 an annular inner recess.
An embodiment of a light source system is also provided herein, and referring to fig. 6, the light source system includes a focusing element 30 as a condenser lens group; the exciting light output by the exciting light source 20 is emitted to the condenser lens group in the direction of the optical axis inclined to the condenser lens group and then is incident to the wavelength conversion region of the wavelength converter 10; the excitation light generated by the wavelength conversion material layer 12 of the wavelength converter 10 is emitted through the condenser lens group in the optical axis direction of the condenser lens group;
a reflecting mirror 50 for deflecting and outputting the excited light is disposed on the output optical path of the condenser lens group.
As shown in fig. 6, the excitation light source 20 is obliquely incident to the wavelength conversion region having a concave surface of the wavelength converter 10 through the condensing lens group, the excited light output from the wavelength conversion region is incident to the condensing lens group after being output, because there is an oblique angle between the excited light and the excitation light, the excitation light beam and the excited light beam can be separated from each other in a spatial position, and the reflecting mirror 50 is disposed on the light path of the condensing lens group outputting the excited light, and can be reflected and output by the reflecting mirror 50.
Further, a filter wheel 60, a shaping lens group 70, and a light rod 80 may be disposed on the output light path of the reflector 50.
It is understood that the wavelength converter 10 in the present embodiment is a reflective wavelength converter, the substrate 11 may be a light-transmitting substrate, and accordingly, the filter film layer 15 for transmitting the excitation light and reflecting 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 which 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 reflect the both excitation light and the excited light out by the mirror 50.
Considering that the filter wheel 60 and the wavelength converter 10 need to rotate synchronously, as shown in fig. 7, the filter wheel 60 and the wavelength converter can be attached to each other so that they share a single driving motor, thereby simplifying the optical 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 unit 22, and the wavelength bands of the excited light output by the light source unit and the wavelength converter 10 are different. A spectral filter 41 for combining the excited light of the wavelength converter 10 and the light output from the light source unit 22 and outputting the combined light is provided on the output light path of the light source unit 22. The wavelength converter 10 is composed of a substrate 11 and a wavelength reflecting material layer 12 of a concave surface as described in any of the above embodiments.
As shown in fig. 8, in addition to the excitation light source 20 that is collimated by focusing and then irradiates the wavelength converter 10 through the spectral filter 41 to excite the excited light output by the wavelength converter 10, the device further includes two light source units 22, the two light source units 22 respectively output light beams of different colors, and the light beams of different wavelength bands are reflected by the spectral filter 41 to the light beam emitted by the excitation light source 20, and transmit the excited light of the wavelength converter 10, and reflect the light beams of the two light source units 22, so that the light beam combination of multiple wavelength bands can be finally realized.
Further, for the excitation of the wavelength converter 10 in the present embodiment as double-sided excitation, the excitation light source 20 may include a first excitation light source 201 and a second excitation light source 202, 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; and in order to avoid the heat of the wavelength converter 10 from being too high, a light-transmitting heat-conducting medium layer 14 can be arranged between the substrate 11 and the wavelength conversion material layer 12 of the wavelength converter 10, so as to be beneficial to 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 solution of the present application can also be implemented by only providing the excitation light source 20.
In addition, in order to further improve the heat dissipation effect of the light source system, the heat sink 23 may be disposed on both the light source unit 22 and the wavelength converter 10, which is beneficial to avoid the influence of the excessive temperature of the light source system during the operation process on the working performance of the light source system. In addition, the concave surface of the wavelength converter 10 also contributes to an increase in heat dissipation area.
It is noted that, herein, relational terms such as first and second, and the like may be 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. Furthermore, 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 does not include elements inherent in the list. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other identical elements in a process, method, article, or apparatus that comprises the element. In addition, parts of the above technical solutions provided in the embodiments of the present application, which are consistent with the implementation principles of corresponding technical solutions in the prior art, are not described in detail so as to avoid redundant description.
The embodiments are described in a progressive manner, each embodiment focuses on differences from other embodiments, and the same or similar parts among the embodiments are referred to each other. The principles and embodiments of the present invention are explained herein using specific examples, which are presented only to assist in understanding the method and its core concepts. It should be noted that, for those skilled in the art, it is possible to make various improvements and modifications to the present invention without departing from the principle of the present invention, and those improvements and modifications also fall within the scope of the claims of the present invention.
Claims (17)
1. A light source system is characterized by 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 area, and a wavelength conversion material layer is arranged on the surface of the wavelength conversion area; the surface of the wavelength conversion material layer arranged in the wavelength conversion region is a concave surface;
the excitation light source is used for outputting excitation light to the wavelength conversion area of the substrate; the wavelength conversion material layer is used for being excited by the excitation light on the concave surface of the wavelength conversion area to generate excited light;
the focusing element is arranged on an output optical path of the wavelength converter and is used for converging and outputting the light output by the wavelength converter.
2. The light source system of claim 1, wherein the concave surface of the wavelength conversion region is a textured surface.
3. The light source system of claim 1, wherein the wavelength conversion material layer is uniformly laid down in a concave surface thickness of the wavelength conversion region.
4. The light source system of claim 1, wherein the concave surface of the wavelength conversion region is any one of an elliptical surface, a spherical surface, or a parabolic surface.
5. The light source system of claim 1, wherein an angle between an optical axis of the concave surface of the wavelength conversion region and a plane in which the substrate lies is greater than 0 degrees and less than 90 degrees.
6. The light source system of claim 5, wherein the concave surface of the wavelength conversion region is a side of a plate-like structure of the wavelength converter.
7. 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.
8. The light source system of claim 1, wherein the number of the wavelength conversion regions on the wavelength converter is 1, and the light collection angle of the focusing element is ≧ 150 degrees.
9. 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.
10. The light source system of claim 1, wherein the wavelength converter further comprises a layer of thermally conductive media;
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.
11. The light source system according to claim 1, wherein the substrate is a light-transmissive substrate, and further comprising a filter film layer disposed on a surface of the wavelength conversion region on a side on which the excitation light is incident, the filter film layer being transmissive to the excitation light and reflective to the excitation light.
12. The light source system according to claim 1, wherein the substrate is a reflective substrate, further comprising a spectral filter element disposed on an exit path of the excitation light source;
the spectral 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 and emitting the excited light generated by the wavelength conversion region;
or the spectral filtering element is an element which transmits the excitation light of the excitation light source and reflects the excitation light of the wavelength conversion region, and is used for transmitting the excitation light to the wavelength conversion region and reflecting the excitation light to emit.
13. The light source system of claim 1, wherein the focusing element is a condenser lens group; exciting light output by the excitation light source is emitted to the condensing lens group in a direction inclined to the optical axis of the condensing lens group and then is emitted to the wavelength conversion area of the wavelength converter; excitation light generated by the wavelength conversion material layer of the wavelength converter is emitted out through the condensing lens group in the direction of the optical axis of the condensing lens group;
and a reflector for deflecting and outputting the excited light is arranged on an output light path of the condenser lens group.
14. The light source system of claim 13, wherein a filter wheel, a shaping lens set and a light rod are disposed on an exit light path of the reflector.
15. The light source system of claim 14, wherein the filter wheel is disposed adjacent to the wavelength converter, and the wavelength converter and the filter wheel are connected to a same driving motor at their centers.
16. The light source system according to any one of claims 1 to 15, further comprising at least one light source section, the wavelength band range of light output by the light source section and the wavelength band range of excited light output by the wavelength converter being different;
and the light path output by the light source part is provided with a light splitting filter which is used for combining the excited light of the wavelength converter and the light output by the light source part for output.
17. The light source system according to claim 16, wherein the excitation light source comprises a first excitation light source and a second excitation light source, wherein the excitation light of the first excitation light source and the 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.
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