CN111176065A - Light source device and laser projection apparatus - Google Patents
Light source device and laser projection apparatus Download PDFInfo
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- CN111176065A CN111176065A CN202010197603.0A CN202010197603A CN111176065A CN 111176065 A CN111176065 A CN 111176065A CN 202010197603 A CN202010197603 A CN 202010197603A CN 111176065 A CN111176065 A CN 111176065A
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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
- G03B21/2013—Plural light sources
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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
- G03B21/2073—Polarisers in the lamp house
Abstract
The application discloses light source device and laser projection equipment belongs to laser technical field. The laser component in the light source device provides first color light with a first polarization direction for the color filter wheel; the first sector of the color filter wheel can guide the light with the first polarization direction to the fluorescent powder wheel and guide the light with the second polarization direction to the optical machine illuminating device, and the second sector can guide the first color light to the fluorescent powder wheel and guide other color lights except the first color light to the optical machine illuminating device; the first sector includes a polarization conversion layer capable of converting light of a first polarization direction emitted from the laser assembly into light of a second polarization direction; the fluorescent wheel is positioned on the light path of the second sector, can emit other colored light except the first colored light under the excitation of the first colored light emitted from the second sector, and can reflect other colored light to the second sector. The problem that the structure of the light source device in the related art is complex is solved, and the effect of simplifying the structure of the light source device is achieved.
Description
Technical Field
The present application relates to the field of laser technology, and in particular, to a light source device and a laser projection apparatus.
Background
Currently, a laser projection apparatus may include a light source device for providing light to an optical machine illumination device, and an optical machine illumination device for outputting the light.
A light source device comprises a laser and a light path component, wherein the laser is used for outputting laser, and the light path component comprises a dichroic sheet, a fluorescent powder wheel, a color filter wheel and the like. When the laser emitted by the laser irradiates the blue light area of the fluorescent powder wheel, the laser transmits the fluorescent powder wheel, passes through the reflector and the blue light loop, irradiates the filter wheel and then enters the optical machine illumination device.
The structure of the light source device is complex.
Disclosure of Invention
The embodiment of the application provides a light source device and laser projection equipment. The technical scheme is as follows:
in one aspect, a light source device is provided, which includes a laser assembly, a color filter wheel, and a phosphor wheel;
the laser assembly is configured to provide a first polarization direction of the first color light to the color filter wheel;
the color filter wheel comprises a first sector and a second sector, the first sector can guide the light with the first polarization direction to the fluorescent powder wheel and guide the light with the second polarization direction to the optical machine illuminating device, and the second sector can guide the first color light to the fluorescent powder wheel and guide other color lights except the first color light to the optical machine illuminating device;
the first sector includes a polarization conversion layer capable of converting the first polarization direction of light emitted from the laser assembly into the second polarization direction of light;
the fluorescent powder wheel is positioned on the light path of the second sector, can emit other colored light except the first colored light under the excitation of the first colored light emitted from the second sector, and reflects the other colored light to the second sector.
Optionally, the first sector includes a polarizing film on a side of the polarization conversion layer adjacent to the laser assembly, the polarizing film being transmissive to light of the first polarization direction and reflective to light of the second polarization direction.
Optionally, the polarization conversion layer comprises 1/4 glass slide.
Optionally, the phosphor wheel includes a phosphor region and a non-phosphor region;
the color filter wheel and the fluorescent powder wheel rotate synchronously, when the color filter wheel rotates to enable the first color light emitted by the laser component to irradiate the second sector, the fluorescent powder wheel rotates to enable the light emitted by the second sector to irradiate the fluorescent powder area, and when the color filter wheel rotates to enable the first color light emitted by the laser component in the first polarization direction to irradiate the first sector, the fluorescent powder wheel rotates to enable the light emitted by the first sector to irradiate the non-fluorescent area.
Optionally, the second sector includes at least two sub-sectors, the at least two sub-sectors are in one-to-one correspondence with at least two color lights, and any one of the sub-sectors can reflect or transmit a corresponding color light.
Optionally, the number of the sub-sectors is 3, and 3 sub-sectors respectively correspond to yellow light, green light, and red light.
Optionally, the first color light is blue light.
Optionally, the color filter wheel and the light emitting direction of the laser component have an included angle of 45 degrees.
Optionally, the light source device further includes a light uniformizing rod, the light uniformizing rod is located on the light path of the light in the second polarization direction and the light of the other color lights, and the light in the second polarization direction and the light of the other color lights enter the organic lighting device after passing through the light uniformizing rod.
In another aspect of the present invention, a laser projection apparatus is provided, which includes the light source device of the first aspect.
The technical scheme provided by the embodiment of the application has the following beneficial effects:
providing a light source device, wherein a laser component provides first color light with a first polarization direction to a color filter wheel, the color filter wheel comprises a first sector and a second sector, a polarization conversion layer in the first sector can guide light with the first polarization direction to a fluorescent powder wheel, convert light reflected back to the first sector from the fluorescent powder wheel into light with a second polarization direction, and then reflect the light with the second polarization direction to an optical machine illumination device; the second sector guides the first color light to the fluorescent powder wheel, emits other color light except the first color light through the excitation of the fluorescent powder wheel, reflects the other color light to the second sector, and then guides the other color light to the light machine illumination device through the second sector. The device divides the color filter wheel into two different sectors, can directly reflect and transmit different light rays, does not need to set other light ray reflection loops, solves the problem that the structure of a light source device in the related art is complex, and achieves the effect of simplifying the structure of the light source device.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed to be used in the description of the embodiments are briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present application, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.
FIG. 1 is a schematic illustration of an implementation environment to which embodiments of the present application relate;
FIG. 2 is a schematic structural diagram of the light source device shown in FIG. 1;
fig. 3 is a schematic structural diagram of a light source device according to an embodiment of the present disclosure;
fig. 4 is a schematic structural diagram of a color filter wheel according to an embodiment of the present disclosure;
fig. 5 is a schematic structural diagram of another light source device according to an embodiment of the present disclosure;
FIG. 6 is a cross-sectional view of a first sector of the color filter wheel of FIG. 5;
FIG. 7 is a cross-sectional view of a first sector of the alternative color filter wheel of FIG. 5;
FIG. 8 is a schematic diagram of an optical path structure of the first sector in FIG. 7;
FIG. 9 is a top view of the phosphor wheel of FIG. 5;
fig. 10 is a top view of the color filter wheel of fig. 5;
fig. 11 is a schematic structural diagram of a laser projector according to an embodiment of the present disclosure.
With the above figures, there are shown specific embodiments of the present application, which will be described in more detail below. These drawings and written description are not intended to limit the scope of the inventive concepts in any manner, but rather to illustrate the inventive concepts to those skilled in the art by reference to specific embodiments.
Detailed Description
To make the objects, technical solutions and advantages of the present application more clear, embodiments of the present application will be described in further detail below with reference to the accompanying drawings.
Fig. 1 is a schematic diagram of an implementation environment according to an embodiment of the present disclosure, which may include a laser projector 10 and a projection curtain 20.
The laser projector 10 may include a light source device 11 and an optical engine illumination device 12. The light source device 11 is used for providing a light source to the optical machine illumination device 12, and the optical machine illumination device 12 is used for projecting a preset pattern onto the projection curtain 20 according to the light source provided by the light source device 11.
The projection curtain 20 is used for carrying the pattern projected by the optical machine illumination device 12. The projection screen 20 may be made of various materials, such as Polyvinyl chloride (PVC), metal, glass fiber, glass beads, etc., and the present embodiment is not limited thereto.
Fig. 2 is a schematic structural diagram of a light source device in the related art. The light source device 11 includes a laser component 111, a dichroic sheet 112, a phosphor wheel 113, a reflector set, a color filter wheel 115, and a light homogenizing rod 116, wherein the light path of the dotted arrow in the figure is the light path of other color lights excited by the phosphor wheel, the light path of the solid arrow is the light path of blue light, and the reflector set includes at least three reflective lenses 1141, 1142, and 1143. The dichroic mirror 112 can control the laser light emitted through the laser assembly 111 or other color light emitted by the reflective phosphor wheel 113 when excited.
Blue light emitted by the laser component 111 passes through the dichroic directional sheet 112 and is focused by the lens and then irradiates the fluorescent powder wheel 113, wherein the fluorescent powder wheel 113 is divided into a light-transmitting area and other color areas, different areas of the fluorescent powder wheel 113 irradiated by the blue light emitted by the laser component 111 can be changed by rotation, when the fluorescent powder wheel 113 rotates to other color areas, the fluorescent powder wheel 113 reflects other excited color lights back to the dichroic directional sheet 112, the dichroic directional sheet 112 guides the blue light to the color filter wheel 115 and then enters the light homogenizing rod 116, and the blue light enters the light machine illumination device through the light homogenizing rod 116. When the phosphor wheel 113 rotates to the transparent area, the blue light enters the reflector area through the transparent area of the phosphor wheel 113, and after being reflected for multiple times by the reflection lenses 1141, 1142, and 1143, the blue light is input to the dichroic direction sheet 112 again, and then is guided by the dichroic direction sheet 112 to the color filter wheel 115, enters the light homogenizing rod 116, and enters the optical machine illumination device through the light homogenizing rod 116.
Among the above-mentioned light source device, the blue light need be through multiple reflection in order to get into the dichroism again to the piece after the printing opacity district of phosphor powder wheel, and the blue light path is comparatively complicated, leads to the reflector plate to be more in quantity, and a plurality of reflector plates have taken up great space in the light source device. In addition, in the working process of the light source device, the laser emitted by the laser component always irradiates the fluorescent powder wheel, so that the temperature of the fluorescent powder wheel is higher, and the efficiency of converting the colored light of the fluorescent powder wheel is reduced.
The embodiment of the application provides a light source device and a laser projection device, which can solve the problems in the related art.
Fig. 3 is a schematic structural diagram of a light source device provided in an embodiment of the present application, where the light source device 30 includes a laser assembly 31, a color filter wheel 32, and a phosphor wheel 33. Fig. 4 is a schematic structural diagram of the color filter wheel in fig. 3.
The color filter wheel 32 includes a first sector 321 and a second sector 322, the first sector 321 is capable of guiding the light with the first polarization direction to the phosphor wheel 33 and guiding the light with the second polarization direction to the optical engine illumination device 50, and the second sector 322 is capable of guiding the light with the first color to the phosphor wheel 33 and guiding the light with the color other than the light with the first color to the optical engine illumination device 50.
The first sector 321 includes a polarization conversion layer 34 (a shaded area in fig. 4), and the polarization conversion layer 34 can convert light of a first polarization direction emitted from the laser assembly 31 into light of a second polarization direction.
The phosphor wheel 33 is positioned on the optical path of the second sector 322, and can emit light of a color other than the first color by excitation of the first color emitted from the second sector 322, and reflect the light of the other color toward the second sector 322.
The color filter wheel is in a rotating mode in fig. 3, and the first sector and the second sector sequentially pass through the laser assembly in a rotating time sequence to provide a light path of the first color light in the first polarization direction.
In summary, the embodiment of the present application provides a light source device, wherein a laser assembly provides a first color light with a first polarization direction to a color filter wheel, the color filter wheel includes a first sector and a second sector, a polarization conversion layer in the first sector can direct light with the first polarization direction to a phosphor wheel, convert light reflected from the phosphor wheel to the first sector into light with a second polarization direction, and then reflect light with the second polarization direction to an optical machine illumination device; the second sector guides the first color light to the fluorescent powder wheel, emits other color light except the first color light through the excitation of the fluorescent powder wheel, reflects the other color light to the second sector, and then guides the other color light to the light machine illumination device through the second sector. The device divides the color filter wheel into two different sectors, can directly reflect and transmit different light rays, does not need to set other light ray reflection loops, solves the problem that the structure of a light source device in the related art is complex, and achieves the effect of simplifying the structure of the light source device.
Fig. 5 is a schematic structural diagram of another light source device 30 according to an embodiment of the present disclosure.
Optionally, the polarization conversion layer comprises 1/4 glass slides. The wave Plate is an optical element for changing the polarization state of light, and the 1/4 glass Plate (English: Quarter-wave Plate) is a birefringent single crystal wave Plate with a certain thickness, and when light with a certain wavelength is vertically incident and passes through, the phase difference between the emergent ordinary light and the emergent abnormal light is 1/4 wavelength. When the 1/4 glass slide is positioned in the light path, the linearly polarized light can be changed into circularly polarized light or elliptically polarized light, or vice versa.
FIG. 6 is a cross-sectional view of a first sector area including a polarization conversion layer 34, the polarization conversion layer 34 including a 1/4 glass 341. The light with the first polarization direction emitted from the laser module 31 passes through the 1/4 glass 341 in the polarization conversion layer 34 and then is emitted to the phosphor wheel 33, and when being reflected back to the first sector 321 by the phosphor wheel, the light again passes through the 1/4 glass 341, and forms the light with the second polarization direction, and then is guided to the optical engine illumination device. That is, the light of the first polarization direction becomes the light of the second polarization direction after passing through the 1/4 glass 341 twice. The 1/4 glass sheet 341 in this application is placed in the light path, and the light path that the laser passes through is ((n +1)1/4 λ, n is 0,1,2, …, λ is the wavelength of the laser, the laser in this application can enter the optical-mechanical lighting device without passing through the multiple reflection light path, that is, the light source device in this application does not need to be provided with a plurality of reflection lenses for reflecting the light path, the volume of the light path structure in the light source device is reduced, the structure of the light source device is simplified, the 1/4 glass sheet 341 can be paved over the whole first sector, so as to avoid that part of the light beam can not form the light in the second polarization direction without passing through the 1/4 glass sheet 341.
Optionally, the first sector includes a polarizing film 342, the polarizing film 342 is on the side of the polarization conversion layer 34 adjacent to the laser assembly, light of the first polarization direction is capable of passing through the polarizing film 342, and the polarizing film 342 is capable of reflecting light of the second polarization direction. A polarizing film is a type of optical film used to generate polarized light or to suppress the polarization effect of the film, and may be used as a polarizing element or a polarization modulation element instead of a birefringent crystal. The first sector of the color filter wheel 32 includes a polarization conversion layer, light emitted from the laser module 31 in the first polarization direction can pass through the polarization film 342 and then pass through the 1/4 glass 341 to emit to the phosphor wheel 33, and when the light is reflected back to the first sector 321 by the phosphor wheel, the light in the second polarization direction can pass through the 1/4 glass 341 again to form light in the second polarization direction, and the polarization film 342 can reflect the light in the second polarization direction to the optical engine illumination device. The polarizing film 342 may have the same area as the first sector to avoid that part of the light of the second polarization direction is not reflected to the opto-mechanical illumination device. The polarizing film 342 may be plated in the first sector using a related art plating process, and detailed description thereof is omitted herein.
Fig. 7 is a cross-sectional view of another first sector of the color filter wheel of fig. 5, the polarization conversion layer 34 may further include an antireflection film 343, the antireflection film 343 is disposed on a side of the 1/4 glass 341 away from the polarizing film 342, and the antireflection film 343 may guide light of the first polarization direction to the phosphor wheel and redirect the light reflected by the phosphor wheel to the 1/4 glass 341. The area of the anti-reflection film 343 may be the same as the first sector, and the anti-reflection film 343 may be plated in the first sector by using a plating process in the related art, which is not described in detail herein.
Fig. 8 is a cross-sectional view of an optical path of the first sector in fig. 7. The laser module 31 emits light with a first polarization direction, the polarizing film 342 of the polarization conversion layer 34 in the first sector 321 transmits the light with the first polarization direction, the 1/4 glass 341 and the antireflection film 343 guide the light with the first polarization direction to the phosphor wheel 33, the phosphor wheel 33 receives and reflects the light with the first polarization direction and reflects the light back to the first sector 321 of the color filter wheel, the light with the first polarization direction passes through the antireflection film 343 of the polarization conversion layer in the first sector 321 and enters the 1/4 glass 341, the light with the first polarization direction which passes through the 1/4 glass 341 for the second time is changed into light with a second polarization direction and is emitted to the polarizing film 342, and the polarizing film 342 reflects the light with the second polarization direction and guides the light into the light-emitting device.
Fig. 9 is a top view of the phosphor wheel of fig. 5.
Optionally, the phosphor wheel 33 includes a phosphor region 331 and a non-phosphor region 332; the color filter wheel and the phosphor wheel rotate synchronously, when the color filter wheel 32 rotates to make the first color light emitted by the laser component 31 irradiate the second sector, the phosphor wheel 33 rotates to make the light emitted by the second sector irradiate the phosphor area 331, and when the color filter wheel 32 rotates to make the first color light emitted by the laser component 31 irradiate the first sector, the phosphor wheel 33 rotates to make the light emitted by the first sector irradiate the non-fluorescent area 332. The display light source for projection is red, green and blue laser, and the laser assembly 31 generally emits blue laser, wherein the red light and the green light are formed by exciting the red light and the green light through the fluorescent powder wheel 33 in the process of light path.
The back plate of the phosphor wheel 33 used in the embodiment of the present application is a total reflection mirror. The phosphor area 331 is an area coated with a phosphor coating, and blue laser light emitted by the laser component 31 is changed into other color fluorescence under excitation of the phosphor coating, and the other color fluorescence is reflected back to the color filter wheel by the reflector back plate. The intensity of the other color phosphor is determined by the brightness of the blue light and the conversion efficiency of the phosphor, and the phosphor region 331 can also be referred to as a wavelength conversion region. Since the color filter wheel 32 and the phosphor wheel 33 rotate synchronously, when the phosphor wheel 33 rotates to the phosphor area 331, the color filter wheel 32 rotates to the second sector, and at this time, the first color light emitted by the laser component 31 irradiates the second sector and irradiates the phosphor area 331 through the second sector, and the excited fluorescence is reflected back to the second sector in the color filter wheel and is reflected to the optical machine illumination device by the second sector. The non-fluorescent region 332 is a region without being coated with phosphor, when the phosphor wheel 33 rotates to the non-fluorescent region 332, the color filter wheel 32 rotates to a first sector, and the first color light emitted by the laser device 31 is guided to the non-fluorescent region 332 by the first sector, and the non-fluorescent region 332 reflects the first color light back to the polarization conversion layer of the first sector, converts the first color light into light in the second polarization direction, and reflects the light to the optical device illumination apparatus through the polarization film of the first sector.
Optionally, the second sector includes at least two sub-sectors, the at least two sub-sectors are in one-to-one correspondence with the at least two color lights, and any sub-sector can reflect or transmit the corresponding color light. The color filter wheel 32 can improve the purity of the fluorescence excited by the phosphor wheel 33, and since the light excited by the phosphor wheel 33 includes red fluorescence and green fluorescence, when the color filter wheel 32 and the phosphor wheel 33 rotate synchronously, the second sector of the color filter wheel 32 and the phosphor area of the phosphor wheel 33 can sequentially output three primary colors. For example, when the phosphor wheel 33 outputs green light, the color filter wheel 32 simultaneously rotates to the green filter region, and when the phosphor wheel 33 outputs red light, the color filter wheel 32 simultaneously rotates to the red filter region. The second sector may also include only one sub-sector, and one sub-sector may include at least red and green wavelength band phosphors.
Fig. 10 is a top view of the color filter wheel of fig. 5.
Optionally, the number of sub-sectors is 3, and 3 sub-sectors correspond to yellow light, green light, and red light, respectively. The 3 sub-sectors in the second sector 322 are a red light filter region R, a green light filter region G, and a yellow light region Y, respectively, where the red light filter region R and the green light filter region G are used to improve the purities of the red laser light and the green laser light. The yellow region Y may improve the brightness of the light source. The number and arrangement sequence of the specific sub-sectors in the color filter wheel 32 can be determined according to the structure of the phosphor wheel and the related requirements, and the embodiment of the present application is not limited herein.
Optionally, the first color light is blue light. The first color light is emitted by the laser assembly 31, and the laser assembly 31 may include a laser 311, a beam reduction lens 312, and a condenser lens 313. When the laser 311 is a blue laser, the emitted first color light is blue light, the beam shrinking lens 312 is configured to shrink the blue light emitted by the laser 311 and guide the blue light to the condensing lens 313, and the condensing lens 313 polymerizes the shrunk blue light and guides the blue light to the color filter wheel 32. The laser 311 used in the present application is a laser that can emit blue light, and the specific laser model is not limited herein.
Optionally, an included angle of 45 degrees is formed between the color filter wheel and the light emitting direction of the laser component. The color filter wheel 32 can guide the light of the first polarization direction emitted by the laser component 31 to the fluorescent powder wheel 33, guide the light of the second polarization direction to the optical machine illumination device, and guide other color lights except the first color light to the optical machine illumination device, and when the included angle between the color filter wheel 32 and the light emitting direction of the laser component 31 is 45 degrees, the color filter wheel 32 can complete the above functions of receiving, transmitting and reflecting the light. Meanwhile, 1/4 of the glass slides in the first sector of the color filter wheel 32 can satisfy that the optical path through which the laser passes is ((n +1)1/4 λ, n is 0,1,2, …, λ is the wavelength of the laser, the included angle between the color filter wheel 32 and the light-emitting direction of the laser assembly 31 can also be between 40 degrees and 50 degrees, and when the included angle between the color filter wheel 32 and the light-emitting direction of the laser assembly 31 is changed, the position of the phosphor wheel 33 can be adjusted at the same time, so as to ensure that the color filter wheel 32 can transmit and reflect the light while receiving the light.
Optionally, the light source device further includes a light uniformizing rod 35, the light uniformizing rod 35 is located on a light path of the light in the second polarization direction and the other color lights, and the light in the second polarization direction and the other color lights enter the light machine illumination device after passing through the light uniformizing rod. The laser in the light source device is generally high in energy, and can be homogenized by adopting a light homogenizing rod. The light homogenizing rod 35 may be a rectangular light homogenizing rod, that is, the light incident surface and the light emitting surface of the light homogenizing rod are both rectangular, and other forms of light homogenizing components may also be selected, which is not limited herein in the embodiment of the present application. As shown in fig. 5, the other color lights and the light with the second polarization direction reflected by the first sector and the second sector of the color wheel enter the light equalizing rod 35, and then the other color lights and the light with the second polarization direction pass through the light equalizing rod 35 and enter the organic lighting device.
In addition, a lens may be disposed between the color filter wheel 32 and the phosphor wheel 33, and a lens may also be disposed between the color filter wheel 32 and the light homogenizing rod 35. The lens may be a condensing lens, and the specific position and number of the lens may be changed according to the size of the light source device and the position of the other lens, and the embodiment of the present application is not limited herein.
In summary, the embodiment of the present application provides a light source device, wherein a laser assembly provides a first color light with a first polarization direction to a color filter wheel, the color filter wheel includes a first sector and a second sector, a polarization conversion layer in the first sector can direct light with the first polarization direction to a phosphor wheel, convert light reflected from the phosphor wheel to the first sector into light with a second polarization direction, and then reflect light with the second polarization direction to an optical machine illumination device; the second sector guides the first color light to the fluorescent powder wheel, emits other color light except the first color light through the excitation of the fluorescent powder wheel, reflects the other color light to the second sector, and then guides the other color light to the light machine illumination device through the second sector. The device divides the color filter wheel into two different sectors, can directly reflect and transmit different light rays, does not need to set other light ray reflection loops, solves the problem that the structure of a light source device in the related art is complex, and achieves the effect of simplifying the structure of the light source device.
As shown in fig. 11, which is a schematic structural diagram of a laser projector according to an embodiment of the present disclosure, the laser projector 40 may include an optical-engine illumination device 50 and the light source device 30 according to the embodiment.
The light emitted from the light source device 30 is input into the optical device illumination device 50, and the optical device illumination device 50 can perform projection by using the light.
After the light source device 30 is turned on, an optical line in the light source device is as shown in fig. 5, when the color filter wheel 32 rotates to the second sector, the phosphor wheel 33 rotates to the phosphor area, the second sector of the color filter wheel 32 transmits the blue laser in the first polarization direction and guides the light to the phosphor area of the phosphor wheel 33, the blue laser is converted into red phosphor under the excitation of the phosphor coating, the reflector back plate of the phosphor wheel 33 reflects the red phosphor to the red light filter area in the second sector of the color filter wheel 32, the red phosphor is reflected to the light homogenizing rod 35 after being reflected by the red light filter area of the second sector, and the red phosphor is guided to the light machine illumination device by the light homogenizing rod 35. The optical line of green fluorescence is the red fluorescence as described above, and the embodiments of the present application are not described herein.
When the color filter wheel 32 rotates to the first sector, the phosphor wheel 33 rotates to the non-fluorescent area, and at this time, the polarizing film of the polarization conversion layer in the first sector transmits the blue laser in the first polarization direction, the 1/4 glass slide and the antireflection film guide the blue laser in the first polarization direction to the non-fluorescent area of the phosphor wheel, the non-fluorescent area of the phosphor wheel receives and reflects the blue laser back to the first sector of the color filter wheel, the blue laser enters the 1/4 glass slide after passing through the antireflection film of the polarization conversion layer in the first sector, the blue laser in the first polarization direction passing through the 1/4 glass slide for the second time is changed into the blue laser in the second polarization direction and is emitted to the polarizing film, the polarizing film reflects the blue laser in the second polarization direction and guides the blue laser in the second polarization direction to the light homogenizing rod 35, and the blue laser after passing through the light homogenizing rod 35 enters the light machine illumination device. In the process, the blue laser does not need to be reflected for multiple times by a plurality of reflectors, the light path of the blue laser is simple, the structural complexity of the light source device is reduced, and the structural volume of the light source device is reduced.
In summary, the present invention provides a laser projector, including a light source device, in which a laser assembly provides a first color light with a first polarization direction to a color filter wheel, the color filter wheel includes a first sector and a second sector, and a polarization conversion layer in the first sector can direct the light with the first polarization direction to a phosphor wheel, convert the light reflected from the phosphor wheel to the first sector into light with a second polarization direction, and then reflect the light with the second polarization direction to an optical device illumination device; the second sector guides the first color light to the fluorescent powder wheel, emits other color light except the first color light through the excitation of the fluorescent powder wheel, reflects the other color light to the second sector, and then guides the other color light to the light machine illumination device through the second sector. The device divides the color filter wheel into two different sectors, can directly reflect and transmit different light rays, does not need to set other light ray reflection loops, solves the problem that the structure of a light source device in the related art is complex, and achieves the effect of simplifying the structure of the light source device.
The above description is only exemplary of the present application and should not be taken as limiting, as any modification, equivalent replacement, or improvement made within the spirit and principle of the present application should be included in the protection scope of the present application.
Claims (10)
1. The light source device is characterized by comprising a laser component, a color filter wheel and a fluorescent powder wheel;
the laser assembly is configured to provide a first polarization direction of the first color light to the color filter wheel;
the color filter wheel comprises a first sector and a second sector, the first sector can guide the light with the first polarization direction to the fluorescent powder wheel and guide the light with the second polarization direction to the optical machine illuminating device, and the second sector can guide the first color light to the fluorescent powder wheel and guide other color lights except the first color light to the optical machine illuminating device;
the first sector includes a polarization conversion layer capable of converting the first polarization direction of light emitted from the laser assembly into the second polarization direction of light;
the fluorescent powder wheel is positioned on the light path of the second sector, can emit other colored light except the first colored light under the excitation of the first colored light emitted from the second sector, and reflects the other colored light to the second sector.
2. The light source device of claim 1, wherein the first sector includes a polarizing film on a side of the polarization conversion layer adjacent to the laser assembly, wherein light of the first polarization direction is capable of being transmitted through the polarizing film, and wherein the polarizing film is capable of reflecting light of the second polarization direction.
3. The light source device according to claim 1, wherein the polarization conversion layer comprises a 1/4 glass slide.
4. The light source device of claim 1, wherein the phosphor wheel comprises a phosphor region and a non-phosphor region;
the color filter wheel and the fluorescent powder wheel rotate synchronously, when the color filter wheel rotates to enable the first color light emitted by the laser component to irradiate the second sector, the fluorescent powder wheel rotates to enable the light emitted by the second sector to irradiate the fluorescent powder area, and when the color filter wheel rotates to enable the first color light emitted by the laser component in the first polarization direction to irradiate the first sector, the fluorescent powder wheel rotates to enable the light emitted by the first sector to irradiate the non-fluorescent area.
5. The light source device of claim 1, wherein the second sector comprises at least two sub-sectors, the at least two sub-sectors corresponding to at least two colors of light, and any one of the sub-sectors is capable of reflecting or transmitting the corresponding color of light.
6. The light source device of claim 5, wherein the number of sub-sectors is 3, and 3 sub-sectors correspond to yellow light, green light and red light, respectively.
7. The light source device according to claim 1, wherein the first color light is blue light.
8. The light source device of claim 1, wherein the color filter wheel has an angle of 45 degrees with the light emitting direction of the laser assembly.
9. The light source device according to claim 1, further comprising a light homogenizing rod, wherein the light homogenizing rod is located on an optical path of the light with the second polarization direction and the other color light, and the light with the second polarization direction and the other color light enter the organic lighting device after passing through the light homogenizing rod.
10. A laser projection apparatus comprising the light source device according to any one of claims 1 to 9.
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| CN202010197603.0A CN111176065A (en) | 2020-03-19 | 2020-03-19 | Light source device and laser projection apparatus |
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