CN106597786A - Fluorescent wheel and bicolor laser light source - Google Patents
Fluorescent wheel and bicolor laser light source Download PDFInfo
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- CN106597786A CN106597786A CN201510658098.4A CN201510658098A CN106597786A CN 106597786 A CN106597786 A CN 106597786A CN 201510658098 A CN201510658098 A CN 201510658098A CN 106597786 A CN106597786 A CN 106597786A
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Classifications
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- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03B—APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR
- G03B21/00—Projectors or projection-type viewers; Accessories therefor
- G03B21/14—Details
- G03B21/20—Lamp housings
- G03B21/2006—Lamp housings characterised by the light source
- G03B21/2033—LED or laser light sources
- G03B21/204—LED or laser light sources using secondary light emission, e.g. luminescence or fluorescence
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- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03B—APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR
- G03B21/00—Projectors or projection-type viewers; Accessories therefor
- G03B21/14—Details
- G03B21/20—Lamp housings
- G03B21/2006—Lamp housings characterised by the light source
- G03B21/2033—LED or laser light sources
-
- 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
- G03B21/206—Control of light source other than position or intensity
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- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Engineering & Computer Science (AREA)
- Multimedia (AREA)
- Projection Apparatus (AREA)
Abstract
The invention discloses a fluorescent wheel which comprises a fluorescent area and a transmission area, wherein the transmission area is used for respectively transmitting a first laser and a second laser; a diffusion layer is arranged on the surface of the fluorescent wheel; the diffusion layer at least corresponds to the transmission area and is used for respectively diffusing the first laser and the second laser before the first laser and the second laser reach the transmission area, so that a function of eliminating spot is achieved while the laser is transmitted and an independent spot eliminating component is avoided. The invention also provides a bicolor laser light source using the fluorescent wheel; the bicolor laser can be subjected to spot elimination; the use of the optical components is reduced; the complexity of an optical frame of the bicolor laser light source is reduced; and the miniaturization of the laser projection equipment is benefited.
Description
Technical Field
The invention relates to the field of laser illumination display, in particular to a fluorescent wheel and a bicolor laser light source.
Background
Laser light is a light source which has high brightness and strong directivity and emits a monochromatic coherent light beam, and is gradually applied to the technical field of projection display in recent years as a light source due to various advantages of laser light. However, the pure laser source has serious speckle problem and high cost, and the laser source which mixes fluorescence and laser is widely applied at present.
Wherein, the fluorescence is generated by coating the fluorescent powder on the wavelength conversion device and exciting the fluorescent powder by laser. For example, a blue laser is used to excite green and red phosphors to generate three primary colors, wherein the green and red phosphors are coated on a rotating wavelength conversion device, usually in a fluorescent wheel structure, and sequentially output the three primary colors according to a time sequence through rotation. Or a red-blue double-color laser light source excites green fluorescent powder on the fluorescent wheel to generate green fluorescence to form tricolor light.
The fluorescent wheel can be classified into a transmission type and a reflection type.
In the transmission type fluorescent wheel, a substrate coated with fluorescent powder is made of transparent material, and fluorescence generated by excitation can be diverged in all directions at 360 degrees, wherein a part of light beam diverged outwards can be reflected back through a reflecting film plated on an outer layer and passes through the transparent substrate of the fluorescent wheel to form transmission, and is emitted out in a direction consistent with the incident direction of laser excitation light, as shown in a cross section diagram of the outer circumference of the fluorescent wheel shown in fig. 1, 3b is a fluorescent powder layer which is generally formed by mixing colloidal fluorescent powder and is clamped and fixed through two layers of glass 3a at the front side and the rear side, an inner surface coating film 3c of the front side glass, which is in contact with the fluorescent powder layer, is used for transmitting laser and reflecting fluorescence, and the rear side glass is used for transmitting the reflected fluorescence and the fluorescence.
In the reflective fluorescent wheel, as shown in fig. 2, the phosphor is usually disposed on the outer circumference of the aluminum substrate, after the laser excites the fluorescence, a part of the fluorescence is specularly reflected by the aluminum substrate and a part of the fluorescence can be directly reflected and emitted in the direction opposite to the incident direction of the laser, and the transmitted laser needs to undergo a loop design of optical axis conversion because the direction of the transmitted laser is opposite to the direction of the fluorescence, and is finally combined with the fluorescence.
In the two types of the fluorescent wheels, laser transmission regions are arranged, laser and fluorescence are sequentially output according to the rotation time sequence of the fluorescent wheel, and the laser after transmission and output can be used as a light source only by dissipating spots through a spot dissipation light path.
And along with the application of red and blue double-color lasers, the red laser replaces red fluorescence, the overall brightness of the laser light source is improved, but the increase of the types of the lasers further aggravates the speckle phenomenon, and special speckle-dissipating components, such as optical fibers, a random phase plate and auxiliary components, need to be added in the optical design to carry out speckle-dissipating light path design so as to meet the quality of the projection illumination light source, but the volume and complexity of an optical framework are increased, so that the miniaturization of the laser projection equipment is not facilitated.
Disclosure of Invention
The invention provides a fluorescent wheel and a bicolor laser light source, wherein the surface of the fluorescent wheel is provided with a diffusion layer at least corresponding to a transmission area, so that the fluorescent wheel can output laser and fluorescence in sequence, and can diffuse the laser to play a role in eliminating speckles, an independent speckle elimination component is omitted, the light processing efficiency of the fluorescent wheel is improved, and the technical problems that the bicolor laser light source is complicated in optical framework design, large in light source volume and not beneficial to miniaturization of laser projection equipment are solved.
The invention is realized by the following technical scheme:
a fluorescent wheel comprising a fluorescent region and a transmissive region; the fluorescent area is used for being excited by laser excitation light to emit fluorescence; the surface of the fluorescence area is also provided with a coating film which is used for transmitting laser excitation light and reflecting fluorescence; wherein,
the transmission region is used for respectively transmitting the first laser and the second laser; the surface of the fluorescent wheel is also provided with a diffusion layer, and the diffusion layer is at least arranged corresponding to the transmission region and used for diffusing the first laser and the second laser before reaching the transmission region.
The transmission region includes a first laser transmission region and a second laser transmission region, and the diffusion layer includes a first laser diffusion region and a second laser diffusion region, respectively.
Further, the divergence angle of the first laser diffusion region to light is larger than that of the second laser diffusion region to light, wherein the second laser is laser excitation light.
Further, the diffusion layer is adaptive to the shape of the transmission area and is fixed on the surface of the transmission area through silica gel bonding.
Furthermore, the diffusion layer is in a fan shape, the central angle of the fan shape is the same as the central angle corresponding to the transmission area, and the diffusion layer is riveted and/or fixed with the fluorescent wheel through glue in the area of the central angle of the fan shape.
Furthermore, the diffusion layer is arranged corresponding to the fluorescence area, wherein the divergence angle of the region, arranged corresponding to the fluorescence area, of the diffusion layer to the light is smaller than the divergence angle of the region, arranged corresponding to the transmission area, of the diffusion layer to the light.
Further, the diffusion layer is disc-shaped, and the diffusion layer is riveted and fixed with the fluorescent wheel in the central area and/or fixed by dispensing.
Furthermore, the diffusion layer is made of ground glass or diffusion sheet material.
Furthermore, the fluorescent region is formed by mixing and curing fluorescent powder and inorganic materials, and is transparent.
Further, the inorganic material includes ceramic, quartz, or glass.
Furthermore, the transmission area is made of transparent glass.
Further, the diffusion layer is made by a semiconductor photolithography process.
Furthermore, an antireflection film is arranged on the outer surface of the diffusion layer.
The double-color laser light source comprises a blue laser and a red laser which respectively emit blue laser and red laser, and further comprises the fluorescent wheel of any scheme, the first laser is red laser, the second laser is blue laser, a fluorescent area of the fluorescent wheel comprises green fluorescent powder, laser excitation light is blue laser, and the green fluorescent powder is excited to emit green fluorescent light.
The technical scheme of the invention at least has the following beneficial technical effects or advantages:
the fluorescent wheel provided by the technical scheme of the invention can sequentially transmit fluorescence and laser, the diffusion layer is arranged on the surface of the fluorescent wheel and at least corresponds to the transmission region, the diffusion layer is used as a part of the fluorescent wheel, and the diffusion layer is equivalent to a moving diffusion sheet by utilizing the working characteristic of rotation of the fluorescent wheel, so that the laser can play a role in eliminating speckles by diffusion of the diffusion layer before being transmitted by the fluorescent wheel, and a separate speckle-eliminating component is omitted. According to the technical scheme, the fluorescent wheel outputs the first laser, the second laser and the fluorescence in a combined manner along the same direction, and the first laser and the second laser are dissipated through one fluorescent wheel component, so that the light processing efficiency of the fluorescent wheel is improved.
The double-color laser light source provided by the technical scheme of the invention not only can realize the combined output of red laser, blue laser and green fluorescence along the same direction by utilizing one fluorescent wheel component, but also can be equivalent to a moving diffusion sheet by arranging the diffusion layer on the surface of the fluorescent wheel, wherein the diffusion layer at least corresponds to the transmission area, and the diffusion layer is equivalent to a moving diffusion sheet by utilizing the working characteristic of the rotation of the fluorescent wheel, so that the laser is diffused by the diffusion layer before being transmitted by the fluorescent wheel to play a role in eliminating speckles, an independent speckle-eliminating component is omitted, the design of a speckle-eliminating light path of a light source system is simplified, and high-quality illumination can be provided for an optical machine. Due to the dual functions of the dissipation spots and the combination of the fluorescent wheel components, the use of optical components in the light source structure is reduced, the complexity of the optical structure of the bicolor laser light source is reduced, and the miniaturization of the laser projection equipment is facilitated.
Drawings
FIG. 1 is a schematic diagram of a transmission fluorescence light path of a fluorescence wheel in the prior art;
FIG. 2 is a schematic diagram of a reflection fluorescence light path of a fluorescence wheel in the prior art;
FIG. 3 is a schematic plane view of a fluorescent wheel provided in example 1 of the present invention;
FIG. 4A is a schematic cross-sectional view of a fluorescent wheel provided in embodiment 1 of the present invention;
FIG. 4B is a schematic cross-sectional view of another fluorescence wheel provided in embodiment 1 of the present invention;
FIG. 5A is a schematic plan view of a diffusion layer provided in example 1 of the present invention;
FIG. 5B is a schematic plan view of a diffusion layer according to embodiment 1 of the present invention;
FIG. 6 is a schematic cross-sectional view of a fluorescent wheel according to embodiment 1 of the present invention;
FIG. 7 is an enlarged partial schematic view of FIG. 6;
FIG. 8 is a schematic plan view of a diffusion layer provided in example 2 of the present invention;
FIG. 9 is a schematic view showing the plane distribution of fluorescence in example 3 of the present invention;
fig. 10 is a schematic cross-sectional view of the structure shown in fig. 9 according to embodiment 3 of the present invention;
FIG. 11 is a schematic view showing the distribution of fluorescence planes in example 4 of the present invention;
fig. 12 is a schematic cross-sectional view of the structure shown in fig. 11 according to embodiment 4 of the present invention;
fig. 13 is a schematic view of a two-color laser light source structure in embodiment 5 of the present invention;
fig. 14 is a schematic view of a specific structure of a two-color laser light source in embodiment 5 of the present invention;
fig. 15 is a timing chart of the operation of the two-color laser light source in embodiment 5 of the present invention;
fig. 16 is a schematic diagram of a gaussian profile of a laser beam.
Detailed Description
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.
Example 1
Embodiment 1 of the present invention provides a fluorescent wheel, which is driven to rotate by a motor, as shown in fig. 3, the fluorescent wheel 3 is in a disc shape, and includes a fluorescent area 31, and a transmissive area 32, since only a small light spot is required for fluorescent excitation, fluorescent light is distributed only in an upper area of the disc of the fluorescent wheel, and the fluorescent area and the transmissive area are usually disposed in an outer circumferential area of the fluorescent wheel. The fluorescent region 31 is provided with a phosphor for emitting fluorescence by excitation of laser excitation light. In the schematic cross-sectional view of the fluorescent wheel shown in fig. 6, the fluorescent area 31 includes a fluorescent area 311, and a coating layer 312 on the surface of the fluorescent area 311. The transmission region 32 is not provided with phosphor powder, and is generally made of transparent glass material, and is configured to provide an independent channel for transmission of laser, so that the laser transmits through the position during a non-fluorescence excitation time period of the laser light source in a rotation time sequence of the fluorescence wheel, where the laser includes a laser excitation light source and may also include a laser non-excitation light source. In the embodiment of the present invention, the transmissive region 32 is configured to transmit the first laser light and the second laser light, respectively, wherein the second laser light is laser excitation light. The transmissive region 32 is typically made of transparent glass and can be formed by first forming a groove and then inserting or clamping the glass sheet. The film coating layer 312 is located on the outer surface of the fluorescence region 311, i.e. the laser incident side, and specifically, is a dichroic film for transmitting the laser excitation light with a higher transmittance and reflecting a part of the fluorescence excited by the laser and incident toward the film layer, specifically, refer to the schematic optical path diagram of the laser excitation fluorescence and the reflected fluorescence shown in fig. 7, where fig. 7 only illustrates excitation and reflection transmission of a part of the fluorescence. In practical applications, the direction of divergence of the fluorescence is multidirectional.
The surface of the fluorescent wheel 3 is further provided with a diffusion layer 33, and the diffusion layer 33 is at least arranged corresponding to the transmission region 32 and is used for diffusing the first laser light and the second laser light before reaching the transmission region 32. Since the transmissive region 32 can be a segment of a circular arc on the outer circumference of the disk of the fluorescent wheel, or a segment of a sector area on the circular surface, correspondingly, the diffusion layer 33 can be adapted to the shape of the transmissive region 32.
Specifically, in one implementation, the diffusion layer 33 and the transmission region are both arc-shaped and are fixed on the surface of the transmission region 32 by bonding with silicone, so that the two are fixed together. As shown in fig. 4A or 4B. In fig. 4A, two transmission regions are symmetrically distributed on the whole fluorescent wheel disc about the center of the circle, so that two upper and lower positions are illustrated in the cross-sectional view of fig. 4A, and correspondingly, two diffusion layers 33 are also arranged corresponding to the transmission regions 32. Also located at the same circumferential position as the two transmissive regions are phosphor regions, not shown. In fig. 4B, the transmissive region is one place on the whole disk-shaped substrate, so that the transmissive region is illustrated as one place 32 in the cross-sectional view of fig. 4B, and accordingly, one place of the diffusion layer 33 is also provided, and 31 is a fluorescent region. Fig. 4A and 4B schematically illustrate the positional relationship between the diffusion layer and the transmissive region and the distribution on the luminescent wheel, and are not particularly limited.
In another implementation manner, the diffusion layer 33 is a sector, the central angle of the sector is the same as the central angle corresponding to the arc where the transmission region is located, and the diffusion layer 33 is fixed to the central area of the fluorescent wheel by riveting, or by dispensing, or by both methods. In this implementation, at least a portion of the fan-shaped diffusion layer 33 corresponding to the transmissive region 32 functions to diffuse incident light.
The diffuser layer 3 may be made of a diffuser plate material that is capable of both transmitting and diffusing laser light through the diffuser plate structure.
The diffusion layer 3 may also be a layer of ground glass, such as fused silica or K9.
The diffusion layer 3 may be a diffusion layer that diffuses light or a diffusion layer that diffracts light, and the specific diffusion method is not limited thereto.
The upper surface of the diffusion layer 3 is a rough surface so as to realize diffuse reflection of light and change the divergence angle and direction of the incident angle, and the lower surface is a smooth surface so as to be bonded and fixed with the smooth glass surface of the transmission area.
The transmission region 32 of the fluorescent wheel 3 is used for transmitting at least one color of laser light, and in the embodiment of the present invention, as the fluorescent wheel rotates, it is used for transmitting two colors of laser light, namely, a first laser light and a second laser light, respectively, wherein the first laser light is a non-laser excitation light source, and the second laser light is a laser excitation light source. The transmission region 32 includes a first laser transmission region and a second laser transmission region according to the position region where the laser light is transmitted, and correspondingly, the diffusion layer 33 also includes a first laser diffusion region and a second laser diffusion region. In the embodiment of the present invention, the divergence angle of the first laser diffusion area to the light may be the same as or different from the divergence angle of the second laser diffusion area to the light, and the divergence angle of the first laser diffusion area to the light is larger than the divergence angle of the second laser diffusion area to the light, and is set in a balanced manner based on different speckle effects caused by lasers of different colors, and if the first laser is laser excitation light and the second laser is non-excitation light, the divergence angle relationship of the corresponding diffusion area is set in an opposite manner.
The plan view of the first laser light diffusing region and the second laser light diffusing region on the diffusing layer 33 is schematically shown in fig. 5A, and the first laser light diffusing region 331 and the second laser light diffusing region 332, which are the same as the division regions of the transmission region 32 on the fluorescence wheel 3, also include a first laser light transmission region and a second laser light transmission region (not shown in the figure). In fig. 5A, the diffusion layer 33 is a sum of two hatched circular arcs, and may be a sum of a sector area 331 and a sector area 332 as shown in fig. 5B, and when the diffusion layer 33 is a sector shape, the transmission area 32 may still be a circular arc or a sector area. The shape, the partition, and the corresponding relationship with the transmissive region of the diffusion layer are only illustrated here, and are not particularly limited. The diffusion layer 33 and the transmission region 32 can be fixed by silicone adhesive, riveting or dispensing at the corner region, or a combination thereof, as described above.
In the embodiment of the invention, the diffusion layer is arranged on the surface of the fluorescent wheel, the diffusion layer is at least arranged corresponding to the transmission area, the diffusion layer as a part of the fluorescent wheel moves along with the rotation of the fluorescent wheel, so that the fluorescent wheel is equivalent to a moving diffusion sheet, the moving diffusion sheet can generate more space random phases for light beams, the condition that the phase difference generating interference is constant is damaged, laser is diffused before entering the transmission area, and the effect of eliminating speckles is achieved.
The corresponding transmission area comprises a first laser transmission area and a second laser transmission area, the diffusion layer also comprises a first laser diffusion area and a second laser diffusion area, different diffusion angles are set for the two diffusion areas, the speckle effect degree caused by lasers with different colors can be balanced, and the effect of dissipating spots is achieved.
Example 2
Embodiment 2 of the present invention is a specific implementation based on embodiment 1, and details of the same parts are not repeated, but the difference is that the first laser may specifically be a red laser, and the second laser may specifically be a blue laser. Blue laser light, which is short in wavelength, is generally used as laser excitation light to excite the phosphor to generate fluorescence with a longer wavelength.
Because human eyes have different degrees of sensitivity to speckle images formed by lasers of different colors, for example, the human eyes have a greater degree of sensitivity to red laser speckles than to blue lasers, and therefore, to achieve a display effect equivalent to the two, the degree of speckle dissipation of the red lasers needs to be increased.
In order to achieve the purpose, in the embodiment of the invention, the divergence angle of the first laser diffusion region, namely the red laser diffusion region, to the light is larger than that of the second laser diffusion region, namely the blue laser diffusion region, to the light.
In the embodiment of the present invention, the diffusion layer structure can be formed by a semiconductor lithography process, and different diffusion angles can be formed on the same ground glass or diffusion plate material by using a template and a lithography step, wherein the different diffusion angles are formed according to the granularity, the shape and the arrangement mode of the outer surface of the diffusion layer. Can make two different regions of dispersing the angle on a diffusion layer structure, for example the angle of dispersing of a region is 1~2 degrees, and the angle of dispersing of another region is 3~5 degrees to can carry out the diffusion of corresponding degree to the laser through this region.
As shown in fig. 5A and 5B, the diffusion layer 33 is provided with a blue laser diffusion region 332 and a red laser diffusion region 331, hereinafter referred to as a blue diffusion region and a red diffusion region, for transmitting and diffusing the blue laser and the red laser, respectively, and specifically, the blue diffusion region 332 and the red diffusion region 331 are formed with outer surfaces with different divergence angles by the foregoing semiconductor lithography process, so as to diffusely reflect the laser beam with strong directivity, increase the divergence angle of the laser beam, and destroy the stability of the spatial phase difference of the beam, thereby destroying the condition for generating interference. The divergence angle of the red light diffusion area to the laser beam is larger than that of the blue light diffusion area, so that the divergence degree of the red laser is increased, and the projection effect of the red light and the projection effect of the blue light are equivalent to each other when the human eyes observe.
And, further, considering that the energy distribution of the laser is gaussian, as shown in fig. 16, the light energy near the 0-degree optical axis is concentrated, the incident angle is the same, the phase or the phase difference is stable, and interference is easily generated, which is also a main cause of strong coherence of the laser, thereby causing a serious speckle phenomenon when the light source forms a projection image. Therefore, in order to improve the speckle eliminating effect on the red laser, for the red light diffusion area 331, a plurality of sub-diffusion areas may be provided, and divergence angles of the plurality of sub-diffusion areas to the red laser are set to be different, where a divergence angle of a sub-diffusion area located in a middle area to the red laser in the plurality of sub-diffusion areas is greater than a divergence angle of a sub-diffusion area located in two side areas to the red laser; the occupied area is larger than the areas of the sub-diffusion areas at the two side areas, so that the area which can concentrate the middle energy of the laser beam is arranged, the diffusion area with the type with a larger divergence angle and a larger area is used for diffusion, and the degree of spot dissipation of the red laser beam is improved.
As shown in fig. 8, the red diffusion region is divided into 3 red laser sub-diffusion regions 331a, 331b, and 331c, and among the angular ratios of the three regions, the angle of 331b is equal to or greater than the sum of 331a and 331c, and the angular ratios of 331a and 331c are equivalent. Taking the central angle of the red diffusion region as 108 degrees, 331b as 54 degrees, and 331a and 331c as 27 degrees, different diffusion angle distributions of the three sub-diffusion regions are only illustrated by way of example, and are not limited to specific values. And, the divergence angle of 331b portion to light is also greater than the divergence angle of 331a and 331c portion to light. For example, the divergence angle of the 331b part can be set to 5 degrees to 5.5 degrees, the divergence angle of the 331a part can be set to 2 degrees to 2.5 degrees, and the divergence angle of the 331c part can be set to 2.5 degrees to 3 degrees, so that the progressive arrangement of the sub-diffusion regions of the red laser diffusion region can effectively perform decoherence aiming at the characteristics of laser Gaussian beams, most of the beams near the 0-degree optical axis are scattered, the beams with multiple divergence angles are increased, and the coherence degree of the red laser is reduced.
In the embodiment of the invention, the diffusion layers are arranged at the positions, corresponding to the red laser transmission areas and the blue laser transmission areas, on the fluorescent wheel, and comprise the red laser diffusion areas and the blue laser diffusion areas, the diffusion layers are used as one part of the fluorescent wheel and move along with the rotation of the fluorescent wheel, so that the fluorescent wheel is equivalent to a moving diffusion sheet, the moving diffusion sheet can generate more space random phases for light beams, the condition that the phase difference for generating interference is constant is damaged, the red laser and the blue laser are respectively diffused before being incident into the transmission areas, and the effect of eliminating speckles is achieved.
Example 3
Embodiment 3 of the present invention is a modification on the basis of embodiment 1 or embodiment 2, and the contents of the same portions as those in embodiment 1 or embodiment 2 are not repeated.
The difference from the embodiments 1 and 2 is that the diffusion layer 33 is provided corresponding to the fluorescent region 31 in addition to the transmissive region 32, wherein the divergence angle of the region of the diffusion layer 33 corresponding to the fluorescent region 31 to light is smaller than the divergence angle of the region of the diffusion layer 33 corresponding to the transmissive region 32 to light. Here, the region of the diffusion layer corresponding to the fluorescence region is relatively weak in divergence of the laser excitation light, and mainly functions to homogenize the laser excitation light beam.
Since the phosphor zones and the transmissive zones are usually located on the outer circumference of the phosphor wheel, a closed circle is formed. As shown in the front distribution diagram of the fluorescent wheel in FIG. 9, the diffusion layer 33 is adapted to the shape of the region where the fluorescent region and the transmissive region are located, and is also located at the outer circumference of the whole fluorescent wheel, and is a complete circular ring structure. Fig. 10 is a schematic cross-sectional view of fig. 9, and as shown in fig. 10, a fluorescent region 31, a transmission region 32 located in the same ring as the fluorescent region 31, and a diffusion layer 33 outside the fluorescent region 31 and the transmission region are sequentially disposed on the disk surface of the fluorescent wheel 3. Here, the fixing manner of the diffusion layer 33 and the fluorescent region 31 and the transmissive region 32 can be described in embodiment 1, and is not described herein again. Considering that the influence on the chemical stability of the fluorescent powder in the fluorescent area is reduced as much as possible, in the embodiment of the present invention, the diffusion layer is preferably fixed to the fluorescent area not by a silica gel adhesion manner, but by riveting and pressing together a fan-shaped circle center angle region corresponding to the arc where the transmission area is located and a central region of the fluorescent wheel, and is fixed by dispensing at a corresponding position.
In the embodiment of the present invention, the diffusion layer 33 is also disposed corresponding to the fluorescent region 31 and is disposed on the outer surface of the fluorescent region 31, in which case, the dichroic film coating 312 may be disposed on the surface of the fluorescent region 31, or may be disposed on the inner surface of the diffusion layer 33 contacting with the fluorescent region 311, that is, when the diffusion layer 33 is a diffusion plate or a piece of ground glass, the coating may be disposed on the inner surface of the diffusion plate or the ground glass contacting with the fluorescent region. In order to increase the light quantity transmitted into the diffusion plate, in the specific implementation, an antireflection film can be additionally coated on the outer surface of the diffusion plate, so that the light quantity of the laser transmitted through the diffusion plate can be increased.
In the embodiment of the present invention, the fluorescent wheel 3 is a transmission type fluorescent wheel, in the prior art, the transmission type fluorescent wheel is usually realized by clamping and fixing a fluorescent region between two glass plates as shown in fig. 1, and plating a dichroic film on the inner side of the front glass, but because the heat conduction coefficient of the glass is low and the heat dissipation is slow, a large amount of heat generated along with the excitation of fluorescence is easy to accumulate to rapidly increase the temperature of a fluorescent powder layer, the temperature of the whole fluorescent wheel is also increased, so that the conversion efficiency of fluorescence is reduced, and because the colloid is an organic material, the chemical stability at high temperature is low, precipitates are easy to generate, so that the conversion efficiency of fluorescence is reduced, and simultaneously the colloid has a certain transmittance and has a certain degree of absorption of light energy, so that a part of light energy is lost when both the incident laser light and the reflected fluorescent light pass through the colloid layer (i.e. the fluorescent powder, thereby reducing the excitation efficiency of fluorescence.
In the embodiment of the present invention, the fluorescent region 31 may be formed by mixing and curing the phosphor and the inorganic material, for example, by a sintering process to cure the phosphor into the ceramic, quartz or glass, rather than by a colloidal bonding. The inorganic material may be selected from ceramics, quartz or glass. The fluorescent region forms a fluorescent layer after sintering and forming, and the fluorescent layer is transparent and can enable excited fluorescence to penetrate through. As shown in fig. 7, 311 is a fluorescent region, which is a mixed layer of inorganic materials and fluorescent powder, 312 is a dichroic film coating layer located on the outer surface of the fluorescent region, laser excitation light, usually blue laser, is firstly transmitted through the dichroic film to enter the fluorescent region, and then is excited and converted into fluorescent light, a part of the fluorescent light is reflected by the dichroic film 312, and a part of the fluorescent light is directly emitted from the back surface of the fluorescent wheel 3 through 311 the fluorescent region (transparent layer), so as to realize transmission of the fluorescent light.
In the embodiment of the invention, the diffusion layer is also arranged corresponding to the fluorescent region, and the divergence angle of the region of the diffusion layer, which is arranged corresponding to the fluorescent region, to the light is smaller than that of the region of the diffusion layer, which is arranged corresponding to the transmission region, to the light, so that the laser excitation light which enters the fluorescent region to excite the fluorescence can also be diffused, but the diffusion is mainly aimed at homogenizing the laser excitation light rather than diffusing the laser excitation light at a large angle. When the blue laser is exciting light, the blue laser firstly reaches the diffusion layer, is diffused and homogenized by the diffusion layer and then enters the fluorescent region to excite the fluorescence. The advantage of doing so is that, because there is the unbalanced condition in the laser beam density that the laser instrument sent, especially when big laser facula is reduced to the facula of small area, optical density grow, this inhomogeneous phenomenon can cause local light energy too concentrated to probably produce the damage of burning to the phosphor layer when using such laser facula to arouse the fluorescent wheel, reduce the excitation efficiency of fluorescence, so when laser excitation light beam passes through above-mentioned diffusion layer, can homogenize the beam energy, light energy density distributes also relatively evenly, thereby avoid the damage to the phosphor layer.
And the diffusion layer is in a complete circular ring shape, so that the problem of counterweight brought to the whole fluorescent wheel when only the diffusion layer is arranged opposite to the transmission region can be avoided. This is because, if the fluorescent wheel is locally heavy, for example, only the transmission region is provided with the diffusion layer, and the transmission region is only a part of the outer circumference of the fluorescent wheel or only a sector, the center of gravity of the whole fluorescent wheel structure may be shifted, when the center of gravity is not consistent with the rotation center, the fluorescent wheel may not rotate at a constant speed, the stability of the fluorescent wheel operation is affected, and the purpose of balancing the weight needs to be achieved additionally by a counterweight, for example, by slotting in the metal support plate area of the fluorescent wheel or reducing the weight of the metal pressing sheet. And when the diffusion layer is in a section of circular arc shape, namely a part of a circular ring component, the processing and gluing precision requirements are relatively high, and the processing and mounting difficulty of the whole circular ring component is greatly reduced.
And the circular ring shape can also be a hollow shape only in the area near the circle center, and when the circular ring shape is adopted, the circular ring shape can still be riveted with the fluorescent wheel and the rotating shaft of the driving motor of the fluorescent wheel through rivets, or the circular ring shape is fixed by dispensing at the riveting position.
And, according to the distinction of different lasers and working purposes, similarly, different laser diffusion regions may be respectively disposed on the annular diffusion layer, and the disposition manner is the same as that described in embodiment 1, and will not be described herein again.
To sum up, in embodiment 3 of the present invention, the diffusion layer is disposed corresponding to both the transmission region and the fluorescence region, and the divergence angle of the light beam in the region corresponding to the fluorescence region is smaller than that in the region corresponding to the transmission region, so that not only can the laser incident to the transmission region be speckle eliminated, but also the laser excitation light incident to the fluorescence region can be homogenized, thereby improving the working safety and fluorescence excitation efficiency of the fluorescence wheel.
The transmission type fluorescent wheel provided by the technical scheme of the embodiment of the invention can sequentially transmit fluorescence and laser, and the diffusion layer is arranged on the surface of the fluorescent wheel and at least corresponds to the transmission region, so that the laser can play a role of eliminating speckles through the diffusion of the diffusion layer before being transmitted by the fluorescent wheel, and a separate speckle elimination component is omitted. According to the fluorescent wheel provided by the technical scheme of the embodiment of the invention, the first laser, the second laser and the fluorescence are combined and output along the same direction, and the first laser and the second laser are dissipated by one fluorescent wheel component, so that the light processing efficiency of the fluorescent wheel is improved.
Example 4
Example 4 of the present invention provides a fluorescent wheel, which is different from example 3 in that a diffusion layer provided on the fluorescent wheel has a disk shape, corresponds to the entire area of the fluorescent wheel, and covers the fluorescent region, the transmission region, and the rotation shaft connection region of the central motor of the fluorescent wheel, as shown in fig. 11.
FIG. 12 is a schematic cross-sectional view of FIG. 11, showing that the diffusion layer 33 has the same area as the whole area of the substrate of the fluorescent wheel, and covers the fluorescent regions 31 and the transmissive regions 32.
The diffusion layer 33 is preferably made of a piece of ground glass or a diffusion plate, the ground glass is made of fused silica or K9, and can be formed by mold lithography, and the outer surface is rough and the inner surface is smooth.
Compared with the circular diffusion layer in the embodiment 3, the processing difficulty of the circular diffusion layer in the embodiment 4 of the invention is further reduced, and meanwhile, in the aspect of fixing, the transmission region, the fluorescent region and the diffusion layer do not need to be glued. Because the diffusion layer part is a whole part with the area equivalent to that of the fluorescent wheel, the weight distribution of the diffusion layer part on the surface of the whole fluorescent wheel is uniform, and when the fluorescent wheel rotates, the diffusion layer cannot generate local deviation due to the rotation and the centrifugal force of the fluorescent wheel, thereby influencing the diffusion effect and influencing the working stability of the fluorescent wheel.
In addition, in the embodiment of the present invention, different laser diffusion partitions may be set in the region of the diffusion layer corresponding to the transmission region according to the distinction between different lasers and the work purpose, and the specific manner may be as in embodiment 1, which is not described herein again. In the embodiment of the present invention, since the fluorescent region is also covered, the laser incident to the fluorescent region also has the diffusion homogenization effect, and different light divergence angles can be set for different regions of the diffusion layer corresponding to the fluorescent region and the transmission region by referring to the setting manner of different light divergence angles for the diffusion region in embodiment 2.
In the embodiment of the invention, the diffusion layer is a whole part, the structure can reduce the processing difficulty of the part except the effect of diffusing and dissipating the laser spots in the embodiments 1 and 2, meanwhile, the fixing mode is simpler and more effective, the fixing and installation can be completed only by riveting, meanwhile, the problem of counterweight caused by local arrangement on the surface of the fluorescent wheel can be avoided, and the working stability of the fluorescent wheel is improved.
In summary, in one or more embodiments, the diffusion layer is disposed on the outer surface of the fluorescent wheel, the diffusion layer is disposed corresponding to the transmission region, and the diffusion layer rotates periodically along with the fluorescent wheel, so that speckle can be eliminated before the laser is incident on the transmission region; the diffusion layer is partitioned according to different sensitivity degrees of human eyes to laser speckle phenomena, and different divergence angles of light are configured in different partitions, so that image speckle effects of different lasers seen by the human eyes can be balanced; the diffusion layer and the fluorescence area are correspondingly arranged, and the divergence angle of the light corresponding to the fluorescence area is set to be smaller than that of the light corresponding to the transmission area, so that the laser excitation light entering the fluorescence area can be diffused and homogenized to a smaller extent, and the fluorescence excitation efficiency and the fluorescence wheel working safety are improved; the diffusion layer is arranged in different shapes, and symmetrical patterns such as a circular ring or a circular disc are used, so that the problem of offset caused by balance weight and movement of the fluorescent wheel due to local arrangement on the fluorescent wheel can be solved; the fluorescent wheel can realize the transmission of laser and fluorescence, and can realize the speckle dissipation effect of the laser, so that the light processing efficiency of the fluorescent wheel is improved.
Example 5
Embodiment 5 of the present invention provides a two-color laser light source, as shown in fig. 13, including a laser light source unit 1, further including a blue laser and a red laser, which emit blue laser and red laser, respectively; the first focusing optical path system 2 is used for focusing larger laser spots emitted by the blue laser and the red laser, and small laser spots reduced to set sizes are incident to the fluorescent wheel 3.
The fluorescent wheel 3 may be the fluorescent wheel described in embodiment 1 or embodiment 2 or embodiment 3 or embodiment 4, and preferably, the fluorescent wheel adopts the fluorescent wheel structure described in embodiment 3 or embodiment 4, that is, the surface of the fluorescent wheel is provided with a diffusion layer, the diffusion layer corresponds to both the transmission region and the fluorescent region, the transmission region includes a red laser transmission region and a blue laser transmission region, and the diffusion layer also corresponds to both the red laser diffusion region and the blue laser diffusion region, and specific partitions and structures may be described in embodiment 3 or embodiment 4, and are not described herein again.
The blue laser and the red laser sequentially penetrate through the diffusion layer and the transmission region of the fluorescent wheel to be emitted according to the lighting time sequence of the laser and the rotation time sequence of the fluorescent wheel.
The fluorescent wheel 3 comprises a green phosphor region formed by mixing and curing green phosphor and inorganic material. The green phosphor region is transparent. The blue laser is laser excitation light, and excites the green fluorescent powder to emit green fluorescence.
The surface of the green fluorescence area is plated with a dichroic film, or the inner surface of the diffusion layer is plated with a dichroic film which is a high-transmittance blue-reflecting green coating and is used for transmitting blue laser and reflecting green fluorescence generated by stimulation; and the green fluorescence reflected by the coating is transmitted by the transparent fluorescence area and is emitted along the direction consistent with the incident direction of the blue laser.
The red laser, the blue laser and the green fluorescence are sequentially output by the fluorescence wheel 3 and then enter the optical rod (not marked in the figure) through the collimation focusing optical path system 4 to provide laser illumination for the optical machine.
Because the fluorescence is inferior to the laser in directivity and has a large divergence angle, and the laser reaches the fluorescence wheel after being focused, the laser is emitted in a divergent state after being emitted according to the principle that the light is propagated along a straight line, so that the divergent light beam needs to be collimated.
And because the light bar has a certain incident angle requirement, the light beam larger than the incident angle of the light bar cannot enter the light bar, thereby causing light loss, in order to improve the efficiency of the light source for entering the light bar, the light beam is focused before entering the light bar, and the angle of the light beam is reduced, so that as much light energy as possible enters the light bar light guide device, thereby improving the illumination of high brightness for the following optical machine components. The structure and operation of the two-color laser light source will be described in detail with reference to fig. 14.
As shown in fig. 14, the laser light source unit 1 includes a blue laser 11 and a red laser 12. In which the blue laser 11 and the red laser 12 are vertically arranged. At present, the diameter of a laser spot emitted by a laser is about 60mm, and the technical requirements of fluorescence excitation can be met only after the laser beam emitted by the laser is shaped, including beam contraction, homogenization and the like, because the excitation of fluorescence requires a laser spot with a small beam area and high energy, and fluorescent powder is easily burnt if the energy density of the spot is too large or uneven. In the embodiment of the present invention, the laser spot diameter for fluorescence excitation is controlled to be about 0.8mm, and therefore, the blue laser and the red laser emitted from the blue laser 11 and the red laser 12 need to be subjected to spot reduction shaping processing.
In one specific implementation, a telescope system, namely a large convex lens and a concave lens (wherein the focuses of the convex lens and the concave lens are coincident) can be used for beam-shrinking shaping, then a convex lens or a combination of two convex lenses is arranged before the beam enters the fluorescent wheel, and the shrunk beam is focused again to form a smaller light spot to be incident on the surface of the fluorescent wheel, so that the size requirement of the light spot received by the surface of the fluorescent wheel is met.
And, in one embodiment, as shown in FIG. 14, a large laser spot is changed to a small high-energy spot by the focusing process using the first focusing optical path system 2. The first focusing optical path system 2 includes a first focusing lens group 21 and a second focusing lens group 23, wherein the first focusing lens group includes two first convex lenses respectively disposed on the blue laser 11 and the emergent light path of the red laser 12, and the first focusing lens has a large surface type due to the first focusing treatment of the larger light beam or light spot emitted from the laser, so as to receive the light beam or light spot of a large area. After being focused by the first focusing lens 21, the blue laser beam or the red laser beam is converged to a certain degree, if the requirement of fluorescence excitation is to be met, the fluorescence wheel needs to be arranged at the position of one time of the focal length of the first focusing lens, and the requirement of system volume design cannot be met, so that the fluorescence wheel is also provided with a second focusing lens which can be a second convex lens and is arranged close to the front of the fluorescence wheel 3 for secondarily focusing the blue laser beam and the red laser beam and enabling the secondarily focused blue laser beam and the red laser beam to be incident to the front of the fluorescence wheel, and the function of accelerating the focusing process of the laser beam is achieved.
And, since in the embodiment of the present invention, the red laser 12 and the blue laser 11 are vertically arranged, and two optical paths with vertical optical axes need to be combined to be incident to the fluorescent wheel along the same direction, the first focusing optical path system 2 further includes a first light combining component 22, which may be a dichroic mirror, for example, and is disposed in the optical path of the blue laser and the red laser focusing process, and has a wavelength selection effect of transmitting blue and reflecting red, and is used for combining the two red lasers and the blue laser in mutually perpendicular directions and outputting laser beams with the same direction.
After the blue laser and the red laser are focused to form small incident light spots, the small incident light spots are sequentially incident to the fluorescent wheel according to the lighting time sequence. In the embodiment of the present invention, the two-color laser light source further includes a control unit (not shown in the figure) for controlling and lighting the fluorescent diffusion area corresponding to the green phosphor area 31 and the blue light diffusion area corresponding to the transmission area on the diffusion layer of the blue laser 11 incident on the fluorescent wheel 3, and controlling and lighting the red laser 12 incident on the red light diffusion area, and finally sequentially incident on the fluorescent area and the transmission area of the fluorescent wheel.
In a specific implementation, the red light, the blue light and the green light have certain lighting cycle time respectively in one cycle in consideration of the white balance of the display system and the brightness requirement of the light source. Taking the display frequency of 120HZ as an example, one period is T =8.3ms, which is the time required for the fluorescent wheel to rotate one circle and is also one time period for the entire group of laser light sources to be sequentially turned on. In the time period of T =8.3ms, the control unit controls the lighting time of the blue laser to occupy about 70% of the total period, in the lighting time of the blue laser, 50% of the time is used for exciting the green fluorescence, and the rest 20% of the time is used for transmitting the green fluorescence, and the control unit controls the lighting time of the red laser to occupy about 30% of the total period, correspondingly, the ratios of the circle center angles occupied by the red diffusion area 331, the blue diffusion area 332 and the green fluorescence area 31 on the fluorescence wheel are about 30%, 20% and 50%, and the circle center angles are respectively 108 degrees, 72 degrees and 180 degrees. The proportion of green fluorescence is large, and the overall light source brightness is improved.
As shown in fig. 15, when the blue laser is in the on state, the red laser is in the off state during this time, when the fluorescent wheel rotates to the green fluorescent region, the diffusion layer and the fluorescent wheel are relatively static, and are in the homogenization diffusion region area corresponding to the fluorescent region, the blue laser firstly passes through the homogenization diffusion region of the diffusion layer and reaches the fluorescent region to excite the fluorescent powder to generate fluorescence, and then the fluorescent wheel outputs green fluorescence during the 50% T time period; when the fluorescent wheel rotates the blue light transmission area, the diffusion layer is positioned in the blue light diffusion area, the blue laser firstly penetrates through the blue light diffusion area of the diffusion layer to be diffused and then enters the blue light transmission area of the fluorescent wheel, and then the fluorescent wheel outputs the blue laser within the 20% T time period; when the blue laser is turned off and the red laser is turned on, the fluorescent wheel rotates the red light transmission area, the diffusion layer is located in the red light diffusion area, similarly, the red laser firstly penetrates through the red light diffusion area of the diffusion layer and then enters the red light transmission area of the fluorescent wheel for transmission, the fluorescent wheel outputs the red laser within a 30% T time period, and therefore the output of the light of the three colors along the same direction is achieved through one fluorescent wheel component, and the optical design of light path conversion and combination is not needed to be carried out on the periphery.
As mentioned above, the blue laser, the red laser and the green fluorescent light outputted from the fluorescent wheel need to be collimated and focused before being incident into the light bar, so as to provide illumination for the optical-mechanical components connected with the light source.
Specifically, as shown in fig. 14, the blue laser light, the red laser light, and the green fluorescent light sequentially emitted pass through the first collimating lens group 41 provided on the rear surface of the fluorescent wheel 3, and these light beams having divergent angles are collimated. The first reflector 42 is a plane reflector, and is configured to convert the optical path directions of the blue laser, the red laser, and the green fluorescence, so that the final output direction of the three primary colors can face the light bar light guide device, and when the optical path direction conversion is not needed, the three primary colors are unnecessarily arranged, and the three color light beams reflected by the first reflector 41 reach the third focusing lens 43, and are configured to finally focus the blue laser, the red laser, and the green fluorescence before entering the light bar, where the first collimating lens group 41, the first reflector 42 (optional), and the third focusing lens 43 form the collimating and focusing optical path system 4 shown in fig. 13. The light bar is a commonly used light guide device or light collection device, and is used for receiving the light beams of the blue laser, the red laser and the green fluorescence after being focused by the third focusing lens, and leading out the light beams for illumination. In the embodiment of the present invention, the light beam with the divergence angle larger than 25 degrees from the optical axis cannot enter the light rod, the light beam with the divergence angle within the range of 25 degrees can all enter the light rod, and the light quantity entering the light rod determines the brightness of the illumination light source, so in order to make the light beam enter the light rod as much as possible, the light beams with various colors output from the fluorescent wheel need to be focused again to reduce and meet the incident angle of the light rod, and the illumination light source with high brightness is provided.
To sum up, the two-color laser light source provided by the embodiment of the invention comprises a blue laser and a red laser which respectively emit blue laser and red laser, and further comprises a fluorescent wheel, wherein the surface of the fluorescent wheel is provided with a diffusion layer, when the surface corresponds to at least a transmission area, the fluorescent wheel can be used as a part of the fluorescent wheel, the fluorescent wheel rotates along with the rotation of the fluorescent wheel by utilizing the working characteristic of the rotation of the fluorescent wheel, so that the diffusion layer is equivalent to a moving diffusion sheet, the laser is diffused by the diffusion layer before being transmitted by the fluorescent wheel, one fluorescent wheel component can diffuse the laser while transmitting, the effect of eliminating speckles is achieved, a separate speckle-eliminating component is omitted, the design of a speckle-eliminating light path of a light source system is simplified, and high-quality illumination can be provided for an optical machine. And when the diffusion layer is also arranged corresponding to the fluorescence area, the diffusion layer can diffuse and eliminate the speckles of the transmission laser, simultaneously can diffuse and homogenize the laser excitation light entering the fluorescence area, improves the excitation efficiency of the fluorescence, and can save a special component for homogenizing the laser excitation light in an optical framework.
In the embodiment of the invention, the fluorescent wheel transmission area sequentially transmits two lasers, so that the combination design of the two-color lasers is simplified, and meanwhile, the laser diffusion areas with different diffusion angles are arranged on the diffusion layer, so that speckles can be specifically eliminated aiming at different speckle effects of the red laser and the blue laser, and a balanced speckle elimination effect is achieved. The fluorescent wheel in the embodiment of the invention is a transmission type fluorescent wheel, the fluorescent area is formed by mixing and curing fluorescent powder and inorganic materials, the problems of low fluorescent conversion efficiency and low heat dissipation efficiency caused by mixing of the fluorescent powder and glue in the prior art can be solved, and the transmission type fluorescent wheel can transmit fluorescence.
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 (14)
1. A fluorescent wheel comprising a fluorescent region and a transmissive region; the fluorescence area is used for being excited by laser excitation light to emit fluorescence; the surface of the fluorescence area is also provided with a coating film which is used for transmitting laser excitation light and reflecting the fluorescence,
the transmission region is used for respectively transmitting the first laser and the second laser;
the surface of the fluorescent wheel is also provided with a diffusion layer, and the diffusion layer is at least arranged corresponding to the transmission region and used for diffusing the first laser and the second laser before reaching the transmission region.
2. The fluorescence wheel of claim 1, wherein the transmission zone comprises a first laser transmission zone and a second laser transmission zone, and correspondingly, the diffusion layer comprises a first laser light diffusion zone and a second laser light diffusion zone.
3. The luminescent wheel of claim 2, wherein the first laser diffusion region has a divergence angle to light that is greater than a divergence angle to light of the second laser diffusion region, wherein the second laser is a laser excitation light.
4. The luminescent wheel as claimed in claim 1, wherein the diffusion layer is adapted to the shape of the transmissive region and is fixed to the surface of the transmissive region by silicone adhesive.
5. The luminescent wheel as claimed in claim 1, wherein the diffusion layer is a fan shape, the central angle of the fan shape is the same as the central angle corresponding to the transmissive region, and the diffusion layer is fixed by riveting and/or dispensing with the luminescent wheel at the central angle area of the fan shape.
6. The fluorescent wheel of claim 1 or 2, wherein the diffusion layer is further disposed corresponding to the fluorescent region, and wherein the diffusion layer has a smaller angle of divergence to light in a region corresponding to the fluorescent region than in a region corresponding to the transmissive region.
7. The luminescent wheel as claimed in claim 6, wherein the diffusion layer is in the shape of a disk, and the diffusion layer is riveted and/or glued to the luminescent wheel at a central region.
8. The luminescent wheel as claimed in claim 1, wherein the diffusion layer is made of ground glass or a diffusion sheet material.
9. The fluorescent wheel of claim 1, wherein the fluorescent area is formed by mixing and curing fluorescent powder and inorganic material, and the fluorescent area is transparent.
10. The luminescent wheel of claim 9, wherein the inorganic material comprises ceramic, quartz, or glass.
11. The fluorescent wheel of claim 1, wherein the transmissive region is a transparent glass material.
12. The luminescent wheel of claim 2, wherein the diffusion layer is formed by a semiconductor lithography process.
13. The luminescent wheel as claimed in claim 1, wherein an anti-reflection film is further disposed on an outer surface of the diffusion layer.
14. A two-color laser light source comprising a blue laser and a red laser emitting a blue laser and a red laser, respectively, and a fluorescent wheel, wherein the fluorescent wheel is according to any one of claims 1 to 13, wherein the first laser is a red laser, the second laser is a blue laser, the fluorescent region of the fluorescent wheel comprises a green phosphor, and the laser excitation light is a blue laser that excites the green phosphor to emit green fluorescence.
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| CN103034036A (en) * | 2011-10-03 | 2013-04-10 | 卡西欧计算机株式会社 | Light source unit and projector |
| CN102645830A (en) * | 2011-12-08 | 2012-08-22 | 深圳市光峰光电技术有限公司 | Light source system and projector |
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| JP2022028725A (en) * | 2017-11-24 | 2022-02-16 | シャープＮｅｃディスプレイソリューションズ株式会社 | Light source device, projector, and chromaticity adjustment method |
| US11340444B2 (en) | 2017-11-24 | 2022-05-24 | Sharp Nec Display Solutions, Ltd. | Phosphor member, light source device, projector and chromaticity adjustment method |
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| CN113064320A (en) * | 2021-02-25 | 2021-07-02 | 江苏师范大学 | Light source system for improving green light brightness |
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Effective date of registration: 20200819 Address after: 266555 Qian WAN port road, Huangdao District, Qingdao, Shandong Province, No. 218 Patentee after: Qingdao Hisense Laser Display Co.,Ltd. Address before: 266100 Zhuzhou Road, Laoshan District, Shandong, No. 151, No. Patentee before: HISENSE Co.,Ltd. |
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