CN110865503A - Fluorescent wheel, laser light source device and laser projection system - Google Patents
Fluorescent wheel, laser light source device and laser projection system Download PDFInfo
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- CN110865503A CN110865503A CN201810987781.6A CN201810987781A CN110865503A CN 110865503 A CN110865503 A CN 110865503A CN 201810987781 A CN201810987781 A CN 201810987781A CN 110865503 A CN110865503 A CN 110865503A
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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
Abstract
The invention discloses a fluorescent wheel, a laser light source device and a laser projection system, comprising: the fluorescent light guide device comprises a circular substrate, a driving rotating shaft fixed at the center of the circular substrate and a plurality of fluorescent light guide components fixed at the circumferential edge of the circular substrate; the fluorescent crystal adopted by the fluorescent light guide component is a single crystal fluorescent material, and as a fluorescent crystal pure substance, the fluorescent light guide component can bear higher temperature and can receive laser with higher energy emitted by the laser array without the problem of fluorescence conversion efficiency reduction. The laser has higher transmittance when being incident to the single crystal fluorescent material, and the laser can hardly be scattered in the laser transmission direction, so that the light loss is small, the laser path is more direct, and the excitation efficiency of the fluorescence can be effectively improved. And the full-wave-band reflecting film is plated on the surface of the fluorescent crystal, so that the fluorescent light at different angles excited by the laser can be efficiently reflected and transmitted in the component, and a certain light homogenizing effect is achieved.
Description
Technical Field
The invention relates to the technical field of projection, in particular to a fluorescent wheel, a laser light source device and a laser projection system.
Background
The laser has the advantages of high brightness, strong monochromaticity, wide color gamut and the like, is applied to the field of projection display, and has higher and higher requirements on output energy along with the increasing of the projection size of the laser display, so that higher requirements are put forward on a laser light source device.
At present, high-energy laser is widely used in laser light source devices to excite fluorescent powder to emit light so as to obtain full-wave band light for display. A fluorescent conversion member employed in a laser light source device generally includes a phosphor layer, and a substrate for carrying the phosphor layer. The size of the fluorescence conversion part cannot be too large due to the limitation of the design of the optical system; if the fluorescent wheel is adopted, the driving rotation speed cannot be infinitely increased due to the limitation of the rotation speed and the bearing of the motor; in order to realize smaller optical expansion and higher optical system efficiency, the thickness of the fluorescent powder layer is limited to a certain extent, and when the fluorescent powder layer exceeds a certain thickness, the deep fluorescent material cannot be excited, so that the excitation efficiency is reduced; meanwhile, the area of the laser spot irradiated on the surface of the fluorescent powder layer is also strictly controlled. In addition, in the laser light source device, a laser beam with high energy density generates a large amount of heat in unit time when irradiating the fluorescent powder layer, although the laser energy that the fluorescent powder can bear is high, because the fluorescent powder cannot be directly used in the fluorescent conversion part, a certain carrier needs to be mixed to fix the fluorescent powder on the substrate, the existing common carriers are silica gel, glass and ceramic, although the temperature resistance performance is different, the existing common carriers are limited by the assembly process, and the temperature resistance performance still cannot exceed the high-temperature bottleneck of 200 ℃. Even if the high temperature resistance of the fluorescent conversion part can be improved, due to the limitation of the thickness of the fluorescent powder layer, when the laser power exceeds a certain power density, the excitation efficiency of the fluorescent powder layer in a unit area is limited, so that the luminous capacity of the fluorescent powder layer is limited, and the luminous efficiency of the laser source device is lower.
Disclosure of Invention
The invention provides a fluorescent wheel, a laser light source device and a laser projection system, which are used for improving the fluorescent conversion efficiency and enabling the laser light source device and the laser projection system to output high energy and high efficiency.
In a first aspect, the present invention provides a fluorescent wheel comprising: the fluorescent light guide component comprises a circular substrate, a driving rotating shaft fixed at the center of the circular substrate and a plurality of fluorescent light guide components fixed at the circumferential edge of the circular substrate;
the fluorescent light guide member includes: the two surfaces of the fluorescent crystal, which are parallel to the substrate, are respectively an incident surface and an emergent light, and the outer surfaces except the incident surface and the emergent surface are provided with a reflecting film layer;
the fluorescence light guide component is used for converting the received exciting light into fluorescence with a set waveband, and the fluorescence is reflected and transmitted inside the reflecting film layer.
In a possible implementation manner, in the fluorescent wheel provided by the present invention, the fluorescent wheel is divided into a fluorescent sector and a transmission sector, and each of the fluorescent light-guiding members is disposed in the fluorescent sector;
the fluorescent wheel further comprises: a plurality of transmissive light guide members fixed to a circumferential edge of the circular substrate, the transmissive light guide members transmitting incident light; each of the transmissive light guide members is disposed in the transmissive sector.
In a possible implementation manner, in the fluorescence wheel provided by the invention, the fluorescence sectors at least comprise a first fluorescence sector and a second fluorescence sector for emitting fluorescence of different wave bands; the fluorescent light guide component in the first fluorescent sector is a first fluorescent light guide component, and the fluorescent light guide component in the second fluorescent sector is a second fluorescent light guide component;
in the first fluorescent light guide component, the incident surface of the fluorescent crystal is provided with a first film layer for transmitting exciting light and reflecting first waveband fluorescent light, and the emergent surface of the fluorescent crystal is provided with a second film layer for transmitting the first waveband fluorescent light and reflecting the exciting light;
in the second fluorescent light guide component, the incident surface of the fluorescent crystal is provided with a third film layer for transmitting the exciting light and reflecting the second waveband fluorescent light, and the emergent surface of the fluorescent crystal is provided with a fourth film layer for transmitting the second waveband fluorescent light and reflecting the exciting light.
In a possible implementation manner, in the fluorescent wheel provided by the invention, the fluorescent crystals in the fluorescent light-guiding members in the first fluorescent sector and the second fluorescent sector are the same; alternatively, the first and second electrodes may be,
the fluorescent crystals in the first fluorescent light-guiding component are first fluorescent crystals, and the fluorescent crystals in the second fluorescent light-guiding component are second fluorescent crystals.
In a possible implementation manner, in the fluorescent wheel provided by the invention, the length of the fluorescent light guide component along the direction perpendicular to the circular substrate is 1-20 mm.
In a second aspect, the present invention provides a laser light source device, including: the fluorescent wheel is positioned on the light emitting side of the laser array, and the light homogenizing component is positioned on one side of the fluorescent wheel, which is far away from the laser array;
the fluorescence wheel rotates in a time sequence, and emergent light of the laser array is incident to the light homogenizing component through the fluorescence wheel.
In a possible implementation manner, in the above laser light source device provided by the present invention, the light uniformizing member is a light guide, and a cross-sectional dimension of the light guide along a direction perpendicular to a laser light transmission direction is larger than a cross-sectional dimension of the fluorescent light guide along a direction perpendicular to the laser light transmission direction;
the light guide pipe and the fluorescent light guide component are separated by a set distance.
In one possible implementation manner, in the laser light source device provided by the present invention, the dodging member is a fly-eye lens group, and the fly-eye lens group and the fluorescence light guide member are spaced by a set distance.
In a possible implementation manner, in the laser light source device provided by the present invention, the outgoing light band of the laser array is 420-470 nm.
In a third aspect, the present invention provides a laser projection system comprising: the laser light source device comprises a light valve modulation component positioned on the light emitting side of the laser light source device and a projection lens positioned on the light emitting side of the light valve modulation component.
The invention has the following beneficial effects:
the invention provides a fluorescent wheel, a laser light source device and a laser projection system, comprising: the fluorescent light guide device comprises a circular substrate, a driving rotating shaft fixed at the center of the circular substrate and a plurality of fluorescent light guide components fixed at the circumferential edge of the circular substrate; the fluorescent light guide member includes: the two surfaces of the fluorescent crystal, which are parallel to the substrate, are respectively an incident surface and emergent light, and the outer surfaces except the incident surface and the emergent surface are provided with a reflecting film layer; and the fluorescent light guide component is used for converting the received exciting light into fluorescent light with a set waveband, and the fluorescent light is reflected and transmitted inside the reflecting film layer. The fluorescent crystal adopted by the invention is a single-crystal fluorescent material, and as a pure fluorescent crystal, the fluorescent crystal can tolerate higher temperature and can receive laser with higher energy emitted by the laser array without the problem of fluorescence conversion efficiency reduction. The laser has higher transmittance when being incident to the single crystal fluorescent material, and the laser can hardly be scattered in the laser transmission direction, so that the light loss is small, the laser path is more direct, and the excitation efficiency of the fluorescence can be effectively improved. And the full-wave-band reflecting film is plated on the surface of the fluorescent crystal, so that the fluorescent light at different angles excited by the laser can be efficiently reflected and transmitted in the component, and a certain light homogenizing effect is achieved.
Drawings
FIG. 1 is a schematic side view of a fluorescent wheel according to an embodiment of the present invention;
FIG. 2 is a schematic front view of a fluorescent wheel according to an embodiment of the present invention;
fig. 3 is a schematic side view of a fluorescent light guide member according to an embodiment of the invention;
FIG. 4 is a schematic cross-sectional view of a fluorescent light guide member according to an embodiment of the present invention;
FIG. 5 is a second schematic diagram of a front view of a fluorescent wheel according to an embodiment of the present invention;
fig. 6 is a schematic side view of a first fluorescent light guide member according to an embodiment of the invention;
fig. 7 is a schematic side view of a second fluorescent light guide member according to an embodiment of the invention;
fig. 8 is a schematic structural diagram of a laser light source device according to an embodiment of the present invention;
fig. 9 is a second schematic structural diagram of a laser light source device according to an embodiment of the present invention;
fig. 10 is a third schematic structural diagram of a laser light source device according to an embodiment of the present invention;
fig. 11 is a schematic structural diagram of a laser projection system according to an embodiment of the present invention.
Detailed Description
The embodiment of the invention provides a fluorescent wheel, a laser light source device and a laser projection system, which are used for improving the fluorescent conversion efficiency and enabling the laser light source device and the laser projection system to output high energy and high efficiency.
In order to make the objects, technical solutions and advantages of the present invention clearer, the present invention will be described in further detail with reference to the accompanying drawings, and it is apparent that the described embodiments are only a part of the embodiments of the present invention, not all of the embodiments. 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.
The following describes the fluorescent wheel, the laser light source device and the laser projection system in detail according to the embodiments of the present invention with reference to the accompanying drawings.
As shown in fig. 1, a fluorescent wheel 100 provided in an embodiment of the present invention includes: a circular substrate 11, a driving shaft 13 fixed at the center of the circular substrate 11, and a plurality of fluorescent light guide members 12 fixed at the circumferential edge of the circular substrate 11. The cross-sectional structure of the fluorescent wheel 100 along the direction perpendicular to the incident light is shown in fig. 2, and the fluorescent light guide members 12 are fixed at the circumferential edge of the circular substrate 11. in practical applications, the circumferential edge of the circular substrate 11 may have a plurality of slots for fixing the fluorescent light guide members, and the fluorescent light guide members 12 may be inserted into the slots for fixing, and the circular substrate 11 may be driven to rotate by the driving conversion, so that each fluorescent light guide member 12 rotates along with the circular substrate.
Further, as shown in the side view structural diagram of the fluorescent light guide member shown in fig. 3 and the cross-sectional structural diagram of the fluorescent light guide member shown in fig. 4, the fluorescent light guide member 12 includes: a fluorescent crystal 121 parallel to two surfaces of the substrate (e.g., a left end surface and a right end surface of the fluorescent crystal in fig. 3) as an incident surface and an exit surface, respectively, and having a reflective film layer 122 on an outer surface except the incident surface and the exit surface; the fluorescent light guide member 12 converts the received excitation light into fluorescent light of a predetermined wavelength band, and reflects and transmits the fluorescent light inside the reflective film layer.
Taking the fluorescent light guide member shown in fig. 3 and 4 as an example, the fluorescent light guide member 12 provided by the embodiment of the present invention may have a quadrangular prism structure, and two end surfaces parallel to the circular substrate 11 are rectangles as shown in fig. 4, as shown in fig. 3, the left end surface of the fluorescent crystal 121 may be an incident surface of light, the right end surface may be an emergent surface of light, and a reflective film 122 is coated on the surface except the incident surface and the emergent surface. In specific implementation, the reflecting film can be a full-wave-band reflecting film layer and is formed on the outer surface of the fluorescent crystal by adopting a coating process. The fluorescent crystal 121 is a novel single crystal fluorescent material, and when the excitation light irradiates the fluorescent crystal, the fluorescent crystal is excited to convert the fluorescence of the set wavelength band, and the single crystal fluorescent material has a certain transmittance, and the fluorescence in the set wavelength band and the excitation light that is not converted can be emitted through the fluorescent crystal. The single crystal fluorescent material is a pure object and can endure higher temperature, so that the single crystal fluorescent material can receive higher-energy laser emitted by a laser array without the problem of fluorescence conversion efficiency reduction. Compared with the fluorescent powder material adopted in the prior art, the fluorescent powder cannot be fixed on the substrate, the fluorescent powder needs to be mixed with colloid or inorganic material to form a mixture and fixed on the substrate, the exciting light is refracted in various media after the exciting light enters the fluorescent powder mixture, the fluorescent particles are excited to convert fluorescence when the laser reaches the fluorescent particles, the transmittance of the exciting light in the mixture is reduced, and part of energy is lost due to refraction in various media, so that the exciting efficiency of the fluorescent light is low, and the utilization efficiency of the laser light is also reduced. The embodiment of the invention directly adopts the single crystal fluorescent material which is a pure substance for fluorescence conversion, the laser has higher transmittance when entering the single crystal fluorescent material, and the laser is hardly scattered in the laser transmission direction, so that the light loss is small, the laser path is more direct, and the excitation efficiency of the fluorescence can be effectively improved. And the full-wave-band reflecting film is plated on the surface of the fluorescent crystal, so that the fluorescent light at different angles excited by the laser can be efficiently reflected and transmitted in the component, and a certain light homogenizing effect is achieved. The fluorescence conversion in the fluorescence wheel adopts a fluorescence guide component, so that the fluorescence conversion efficiency is improved; the use of such a fluorescent wheel in the laser light source device and the laser projection system enables high-energy and high-efficiency output of the laser light source device and the laser projection system.
As shown in fig. 2, the fluorescent wheel 100 provided by the embodiment of the invention can be divided into a fluorescent sector XX and a transmission sector YY, and each fluorescent light-guiding member 12 is disposed in the fluorescent sector XX; then in the transmission sector, the fluorescent wheel 100 further includes: a plurality of transmissive light guide members 14 fixed to a circumferential edge of the circular substrate 11, the transmissive light guide members 14 for transmitting and transmitting incident light; each transmissive light guide member 14 is disposed in the transmissive sector YY. In practical applications, the excitation light source continuously irradiates the fluorescence wheel, and at the same time, the fluorescence wheel rotates at a set time sequence, at some time sequences, the excitation light irradiates on the fluorescence light guide component 12, the fluorescence light of the set wavelength band is efficiently converted, at other time sequences, the excitation light irradiates on the transmission light guide component 14, and the transmission is directly carried out, so that light rays with different colors of the excitation light wavelength band and the set fluorescence wavelength band can be provided.
Further, as shown in fig. 5, in the fluorescence wheel provided in the embodiment of the present invention, the fluorescence sectors XX include at least a first fluorescence sector XXa and a second fluorescence sector XXb for emitting fluorescence of different wavelength bands; the fluorescent light guide members in the first fluorescent light sector XXa are first fluorescent light guide members 12a, and the fluorescent light guide members in the second fluorescent light sector XXb are second fluorescent light guide members 12 b. Fig. 6 shows a schematic side view of the first fluorescent light guide member 12a, and fig. 7 shows a schematic side view of the second fluorescent light guide member 12 b. As shown in fig. 6, in the first fluorescent light guide member 12a, the incident surface of the fluorescent crystal 121 is provided with a first film 123 for transmitting the excitation light and reflecting the first wavelength band fluorescent light, and the exit surface of the fluorescent crystal 121 is provided with a second film 124 for transmitting the first wavelength band fluorescent light and reflecting the excitation light; as shown in fig. 7, in the second fluorescent light guide member 12b, the incident surface of the fluorescent crystal 121 is provided with a third film 125 for transmitting the excitation light and reflecting the second wavelength band fluorescent light, and the exit surface of the fluorescent crystal 121 is provided with a fourth film 126 for transmitting the second wavelength band fluorescent reflected excitation light.
In practical applications, the principle of coating the first fluorescent light guide member 12a on the incident surface and the emission surface is the same as that of coating the second fluorescent light guide member on the incident surface and the emission surface, and the coating principle of the first fluorescent light guide member 12a will be explained below. Firstly, a first film layer 123 for transmitting exciting light and reflecting first waveband fluorescence is arranged on an incidence surface of the fluorescent crystal, only the incidence of the exciting light is allowed, the exciting light is fully incident into the fluorescent crystal to excite the fluorescence with a set waveband, the first waveband belongs to the set waveband, and the converted fluorescence can be reflected to an emergence surface under the action of the first film layer on the incidence surface, so that the emergence of the first waveband fluorescence is facilitated; the second film 124 for transmitting the first waveband fluorescence reflection excitation light is arranged on the emergent surface of the fluorescent crystal, only the transmission of the first waveband fluorescence is allowed, the emergence of the excitation light is prevented, the excitation light is reflected back to the inside of the fluorescent crystal, the excitation light can act on the fluorescent crystal again, more fluorescence is converted, and meanwhile, the fluorescence emitted by the first fluorescent light guide component 12a is only the fluorescence of the first waveband. Because the exciting light can reciprocate in the fluorescent crystal, the length of the fluorescent crystal can be reduced, the fluorescent crystal with smaller length can achieve high-energy fluorescent output, the fluorescent conversion efficiency is improved, and the size of the fluorescent conversion system is further reduced. The working principle of the coating of the second fluorescent light guide member 12b is the same as that of the first fluorescent light guide member 12a, and the description thereof is omitted. Meanwhile, the fluorescent light converted by the fluorescent crystal can be filtered by adopting a film coating mode, so that when the fluorescent wheel is applied to a laser projection system, light rays with different colors can be output in a time sequence along with the rotation of the fluorescent wheel, a color filtering wheel does not need to be arranged for matching with the fluorescent wheel, the integrated design of converting the fluorescent light and filtering the light is realized, the structure of the projection system is favorably simplified, and the volume of the projection system is reduced.
In a specific implementation, in the laser light source device provided in the embodiment of the present invention, the light emitted from the laser array may be blue light, besides, violet light, ultraviolet light, and the like may also be used as the excitation light, which is not limited herein. For example, when blue light is used as the excitation light, the emission wavelength band of the laser array may be 420-470 nm.
Further, the fluorescent crystals in the fluorescent light guide members in the first fluorescent sector XXa and the second fluorescent sector XXb can be made of the same single-crystal fluorescent material, for example, when blue light is used as the excitation light, the fluorescent crystals are YAG fluorescent crystals, which are yellow crystals, and can be stimulated to emit yellow light of 500-. The upper fluorescent light guide component made of the same fluorescent crystal material is matched with the coating films on the light incident surface and the light emergent surface of the fluorescent crystal to realize the emission of the fluorescent lights with different colors, so that the high-purity fluorescent lights with different colors can be emitted, only one fluorescent crystal material needs to be generated in the manufacturing process, and the process difficulty can be simplified. In practical applications, the first film 123 disposed on the incident surface of the fluorescent crystal in the first fluorescent light-guiding member 12a can be used for transmitting blue light and reflecting red light, and the second film 124 disposed on the emergent surface thereof can be used for transmitting red light and reflecting blue light; the third film 125 disposed on the incident surface of the fluorescent crystal in the second fluorescent light-guiding member 12b can be used for transmitting blue light and reflecting green light, and the fourth film 126 disposed on the exit surface thereof can be used for transmitting green light and reflecting blue light. In addition, the first fluorescent light guide component can also be used for emitting fluorescent light of other colors except for red, and the second fluorescent light guide component can also be used for emitting fluorescent light of other colors except for green, at this time, the material of the fluorescent crystal needs to be reasonably selected, and the coating films of the incident surface and the exit surface are matched, so that the working principle of the fluorescent light guide component is the same as the above principle, and the detailed description is omitted, and the fluorescent light guide component can be arranged according to actual needs during specific implementation, and is not limited herein.
In another embodiment, the fluorescent crystals in the first fluorescent light-guiding members 12a and the second fluorescent light-guiding members 12b may be made of different materials; for example, the fluorescence converted by the fluorescent crystals in the first fluorescent light-guide member 12a after receiving the irradiation of the blue excitation light may be yellow light; the fluorescent crystals in the second fluorescent light-guiding member 12b receive blue excitation light and convert the fluorescence into green light. In practical application, the fluorescent crystal stimulated to emit green fluorescence can be a green fluorescent crystal, the fluorescent crystal stimulated to emit yellow fluorescence can be a yellow fluorescent crystal, meanwhile, the first film layer arranged on the light incident surface of the yellow fluorescent crystal can be used for transmitting blue light and reflecting red light, and the second film layer arranged on the light emergent surface of the yellow fluorescent crystal can be used for transmitting red light and reflecting blue light; the third film layer arranged on the incident surface of the green fluorescent crystal can be used for transmitting blue light and reflecting green light, and the fourth film layer arranged on the emergent surface of the green fluorescent crystal can be used for transmitting green light and reflecting blue light. Wherein the yellow fluorescence band is 500-670nm, the green fluorescence band is 500-580nm, and the red fluorescence band is 580-670 nm. Compared with the implementation mode of adopting the same fluorescent crystal material to realize the emission of green and red fluorescence, the green fluorescence emitted by adopting the green fluorescent crystal has higher fluorescence use efficiency. This is because when the same fluorescent material is used to generate green light and red light, the wavelength range of the fluorescence converted by the fluorescent material must cover the wavelength ranges of red light and green light, and only the green light or red light is actually needed, so when the green light needs to be emitted, the converted red light is filtered by the coating film on the emitting surface; when red light needs to be emitted, the converted green light is filtered by the coating film on the emitting surface, only a small part of the converted fluorescent light can be emitted, other fluorescent light is not used, the using efficiency of the fluorescent light is low, and the energy of the emitted fluorescent light is not high. And if green fluorescent crystal is adopted to convert green light, most of converted fluorescence can penetrate through the film layer of the emergent surface, the use efficiency of the fluorescence is higher, and the energy of the emergent fluorescence is also higher. The red fluorescent crystal material produced by the current process means is not mature, and the red fluorescence is formed by adopting a mode of matching yellow fluorescent crystal with a coating; however, with the continuous progress of the process, when the stable red fluorescent crystal is manufactured, the red fluorescent crystal can be directly used as the first fluorescent crystal to achieve higher fluorescent use efficiency, and the embodiment of the present invention is not limited herein.
In any of the above embodiments, the conversion spectrum of the fluorescence is generally wide, and the fluorescence band used in practical applications is only a small range of the band, so that it is necessary to provide a film layer for enhancing the set band of reflection on the incident surface of the fluorescent crystal, and it is necessary to provide a film layer for enhancing the set band of transmission on the emission surface of the fluorescent crystal, so that the half-width peak of the emitted fluorescence is narrowed, and the display device is more suitable for display requirements. In the above example, if the excitation light is blue light, the first film layer may be configured to transmit blue light and reflect red light, and the second film layer may be configured to transmit red light and reflect blue light; the third film layer may be configured to transmit blue light to reflect green light and the fourth film layer may be configured to transmit green light to reflect blue light.
When the size of the fluorescent light guide member 12 is set, it is necessary to consider the requirements of wavelength conversion and optical transmittance in the optical system, and the transmittance of the fluorescent light guide member 12 in the direction perpendicular to the circular substrate 11 decreases with the increase of the setting length, so that the length of the fluorescent light guide member 12 cannot be set too large; if the length is set too small, the wavelength conversion requirement cannot be satisfied, and the converted fluorescence energy is low. Then, in the embodiment of the present invention, the length of the fluorescent light guide 12 in the direction perpendicular to the circular substrate may be 1-20mm in consideration of the wavelength conversion requirement in practical use. Regarding the cross-sectional dimension of the fluorescent light guide member 12, the cross-sectional dimension of the fluorescent light guide member 12 may be generally set to be larger than the spot dimension of the incident laser light, so that the excitation light is fully incident into the fluorescent crystal, and the laser light is prevented from being incident into the region outside the fluorescent light guide member, which reduces the laser use efficiency.
Based on the same inventive concept, an embodiment of the present invention further provides a laser light source apparatus, as shown in fig. 8, the laser light source apparatus provided in the embodiment of the present invention includes: the laser array 200, the fluorescent wheel 100 positioned at the light-emitting side of the laser array 200, and the light homogenizing part 300 positioned at the side of the fluorescent wheel 100 away from the laser array 200; the fluorescent wheel can be any one of the fluorescent wheels with the structure. The fluorescent wheel 100 rotates in time sequence, and the outgoing light from the laser array 200 passes through the fluorescent wheel 100 and enters the light unifying unit 300.
In practical applications, if the fluorescent light guide 12 is disposed to be too large along the length parallel to the laser light transmission direction, the transmittance of the fluorescent crystal will be reduced, which is not favorable for converting the emission of fluorescent light. Therefore, considering the requirements of wavelength conversion and optical transmittance, the fluorescent light guide member should not be set to have an excessively large length, and even if the fluorescent light guide member has a certain light-homogenizing effect, the light-homogenizing member 300 is still required to be set for homogenizing and transmitting the emitted fluorescent light and the excitation light in practical application.
In an implementation manner, as shown in fig. 8, the light uniformizing member may be a light guide (the light guide is denoted by reference numeral 300 in fig. 8), a cross-sectional dimension of the light guide in the direction perpendicular to the laser light transmission direction is larger than a cross-sectional dimension of the fluorescent light guide 12 in the direction perpendicular to the laser light transmission direction, and the light guide is spaced from the fluorescent light guide 12 by a set distance. Specifically, the light guide is a hollow tubular member, and when the light guide is implemented, it is necessary to make all the light emitted from the fluorescent light guide 12 enter the light guide as much as possible, which requires strict control of the installation position and size of the fluorescent light guide 12 and the light guide in accordance with the optical design. The cross-sectional dimension of the light guide is required to be larger than that of the fluorescent light guide component, the distance between the light guide and the fluorescent light guide component also needs to consider the relation between the cross-sectional dimensions of the light guide and the fluorescent light guide component, and the light with the largest angle emitted by the fluorescent light guide component can be incident into the light guide as far as possible, so that most of the emitted light of the fluorescent light guide component can be incident into the light guide to be effectively and uniformly transmitted.
In another practical way, as shown in fig. 9, the dodging component may further adopt a fly eye lens group 400, and the fly eye lens group 400 is spaced from the fluorescence light guide component 12 by a set distance. The fly-eye lens group is applied to an illumination system and can obtain high light energy utilization rate and large-area uniform illumination. In general, the fly-eye lens assembly includes two rows of fly-eye microlens arrays, wherein the focal point of each microlens unit in the first row of fly-eye microlens array coincides with the center of the corresponding microlens unit in the second row of fly-eye microlens array along the incident direction of light, at this time, the optical axes of the two rows of fly-eye microlens arrays are parallel to each other, in practical applications, a condenser lens may be disposed behind the light of the second row of fly-eye microlens array, and uniform illumination may be obtained on the focal plane of the condenser lens. In the embodiment of the invention, the focal length of the fly-eye lens group and the distance between the fluorescence light guide component and the fly-eye lens group can be adjusted according to the requirement of the optical system, so that the emergent light can meet the special requirement of the optical system.
In practical applications, as shown in fig. 10, the laser light source device further includes: a shaping lens assembly 500 positioned between the laser array 200 and the fluorescent wheel 100. The shaping lens assembly 500 has dual functions of focusing and collimating, and can adjust the emergent beam of the laser array so that the size of the laser spot incident on the fluorescence light guide component 12 meets the actual requirement, and the laser spot has higher energy.
On the other hand, an embodiment of the present invention further provides a laser projection system, as shown in fig. 11, the laser projection system includes any one of the above laser light source devices, a light valve modulation component 600 located on the light emitting side of the laser light source device, and a projection lens 700 located on the light emitting side of the light valve modulation component 600. The laser light source device can output light beams with different colors in a time sequence to be incident to the light valve modulation component 600, and the light valve modulation component 600 modulates the incident light beams with different colors in a time sequence, so that an image reflected to the projection lens 700 to be imaged meets the requirement.
In an implementation, the light valve modulating component 600 may be a Digital Micromirror Device (DMD). The laser projection system provided by the embodiment of the invention can adopt a Digital Light Processing (DLP) framework, and the image signal is digitally processed, so that different colors of Light rays emitted by the laser Light source device in a time sequence are projected on the DMD chip, the DMD chip modulates and reflects the Light rays according to the Digital signal, and finally the Light rays are imaged on the projection screen through the projection lens.
The embodiment of the invention provides a fluorescent wheel, a laser light source device and a laser projection system, which comprise: the fluorescent light guide device comprises a circular substrate, a driving rotating shaft fixed at the center of the circular substrate and a plurality of fluorescent light guide components fixed at the circumferential edge of the circular substrate; the fluorescent light guide member includes: the two surfaces of the fluorescent crystal, which are parallel to the substrate, are respectively an incident surface and emergent light, and the outer surfaces except the incident surface and the emergent surface are provided with a reflecting film layer; and the fluorescent light guide component is used for converting the received exciting light into fluorescent light with a set waveband, and the fluorescent light is reflected and transmitted inside the reflecting film layer. The fluorescent crystal adopted by the invention is a single-crystal fluorescent material, and as a pure fluorescent crystal, the fluorescent crystal can tolerate higher temperature and can receive laser with higher energy emitted by the laser array without the problem of fluorescence conversion efficiency reduction. The laser has higher transmittance when being incident to the single crystal fluorescent material, and the laser can hardly be scattered in the laser transmission direction, so that the light loss is small, the laser path is more direct, and the excitation efficiency of the fluorescence can be effectively improved. And the full-wave-band reflecting film is plated on the surface of the fluorescent crystal, so that the fluorescent light at different angles excited by the laser can be efficiently reflected and transmitted in the component, and a certain light homogenizing effect is achieved.
While preferred embodiments of the present invention have been described, additional variations and modifications in those embodiments may occur to those skilled in the art once they learn of the basic inventive concepts. Therefore, it is intended that the appended claims be interpreted as including preferred embodiments and all such alterations and modifications as fall within the scope of the invention.
It will be apparent to those skilled in the art that various changes and modifications may be made in the present invention without departing from the spirit and scope of the invention. Thus, if such modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include such modifications and variations.
Claims (10)
1. A fluorescent wheel, comprising: the fluorescent light guide component comprises a circular substrate, a driving rotating shaft fixed at the center of the circular substrate and a plurality of fluorescent light guide components fixed at the circumferential edge of the circular substrate;
the fluorescent light guide member includes: the two surfaces of the fluorescent crystal, which are parallel to the substrate, are respectively an incident surface and an emergent light, and the outer surfaces except the incident surface and the emergent surface are provided with a reflecting film layer;
the fluorescence light guide component is used for converting the received exciting light into fluorescence with a set waveband, and the fluorescence is reflected and transmitted inside the reflecting film layer.
2. The luminescent wheel of claim 1, wherein the luminescent wheel is divided into a luminescent sector and a transmission sector, each of the luminescent light guides being disposed within the luminescent sector;
the fluorescent wheel further comprises: a plurality of transmissive light guide members fixed to a circumferential edge of the circular substrate, the transmissive light guide members transmitting incident light; each of the transmissive light guide members is disposed in the transmissive sector.
3. The fluorescent wheel of claim 2, in which the fluorescent sectors include at least a first fluorescent sector and a second fluorescent sector for emitting different wavelength bands of fluorescence; the fluorescent light guide component in the first fluorescent sector is a first fluorescent light guide component, and the fluorescent light guide component in the second fluorescent sector is a second fluorescent light guide component;
in the first fluorescent light guide component, the incident surface of the fluorescent crystal is provided with a first film layer for transmitting exciting light and reflecting first waveband fluorescent light, and the emergent surface of the fluorescent crystal is provided with a second film layer for transmitting the first waveband fluorescent light and reflecting the exciting light;
in the second fluorescent light guide component, the incident surface of the fluorescent crystal is provided with a third film layer for transmitting the exciting light and reflecting the second waveband fluorescent light, and the emergent surface of the fluorescent crystal is provided with a fourth film layer for transmitting the second waveband fluorescent light and reflecting the exciting light.
4. The fluorescent wheel of claim 3, in which the fluorescent crystals in each of the fluorescent light guides in the first fluorescent sector are the same as in the second fluorescent sector; alternatively, the first and second electrodes may be,
the fluorescent crystals in the first fluorescent light-guiding component are first fluorescent crystals, and the fluorescent crystals in the second fluorescent light-guiding component are second fluorescent crystals.
5. The fluorescent wheel of any of claims 1-4, wherein the fluorescent light guide member has a length in the direction perpendicular to the circular substrate of 1-20 mm.
6. A laser light source device, comprising: a laser array, a luminescent wheel according to any one of claims 1-5 on an exit side of the laser array, and a light unifying component on a side of the luminescent wheel facing away from the laser array;
the fluorescence wheel rotates in a time sequence, and emergent light of the laser array is incident to the light homogenizing component through the fluorescence wheel.
7. The laser light source device according to claim 6, wherein the light unifying member is a light guide tube having a cross-sectional dimension perpendicular to the laser light transmission direction larger than a cross-sectional dimension of the fluorescent light guide member perpendicular to the laser light transmission direction;
the light guide pipe and the fluorescent light guide component are separated by a set distance.
8. The laser light source device according to claim 6, wherein the dodging member is a fly eye lens group, and the fly eye lens group is spaced from the fluorescence light guide member by a set distance.
9. The laser light source device as claimed in any one of claims 6 to 8, wherein the outgoing light band of the laser array is 420-470 nm.
10. A laser projection system comprising the laser light source device according to any one of claims 6 to 9, a light valve modulation member located on the light exit side of the laser light source device, and a projection lens located on the light exit side of the light valve modulation member.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810987781.6A CN110865503A (en) | 2018-08-28 | 2018-08-28 | Fluorescent wheel, laser light source device and laser projection system |
| PCT/CN2019/087212 WO2020042672A1 (en) | 2018-08-28 | 2019-05-16 | Fluorescence conversion assembly, laser light source device, and laser projection system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810987781.6A CN110865503A (en) | 2018-08-28 | 2018-08-28 | Fluorescent wheel, laser light source device and laser projection system |
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| Publication Number | Publication Date |
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| CN110865503A true CN110865503A (en) | 2020-03-06 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201810987781.6A Pending CN110865503A (en) | 2018-08-28 | 2018-08-28 | Fluorescent wheel, laser light source device and laser projection system |
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| CN (1) | CN110865503A (en) |
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