Fluorescent wheel, ray machine and projection equipment
By introducing the transmission diffusion region and the wavelength conversion region into the fluorescent wheel, the speckle problem of projected image caused by high excitation light coherence is solved, and image quality is improved and cost reduction is achieved.
Patent Information
- Application Number
- CN202411999314.7
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2024-12-31
- Publication Date
- 2025-03-11
AI Technical Summary
In the existing laser projection equipment, the excitation light emitted by the fluorescent wheel is highly coherent, resulting in speckle problems in projected images.
A fluorescent wheel is designed that includes a transmission diffusion region and a wavelength conversion region. The transmission diffusion region transmits and diffuses the incident excitation light, and the wavelength conversion region converts the wavelength of the excitation light into the received laser light, thereby reducing the coherence of the excitation light.
Through diffusion and wavelength conversion, the coherence of the excitation light emitted by the fluorescent wheel is reduced, the speckle of the projected image of the optical machine is weakened, and three-primary color light of different wavelengths can be obtained, reducing equipment cost.
Smart Images
Figure CN119596537A_ABST
Abstract
Description
Technical Field
[0001] The present application relates to the field of projection technology, and in particular to a fluorescent wheel, an optical machine and a projection device. Background Art
[0002] Current laser projection equipment still uses a monochromatic laser diode as the main light source, and obtains multiple excited light beams with different wavelengths or directly emitted excitation light by irradiating the excitation light emitted by the monochromatic laser diode onto a rotating fluorescent wheel. However, the coherence of the excitation light directly emitted from the fluorescent wheel is high, resulting in the problem of speckle in the image projected by the laser projection equipment. Summary of the invention
[0003] The present application discloses a fluorescent wheel, an optical machine and a projection device to reduce the coherence of the excitation light emitted by the fluorescent wheel.
[0004] In a first aspect, the present application relates to a fluorescent wheel, comprising:
[0005] a transmission diffusion region, used to transmit and diffuse incident excitation light; and
[0006] The wavelength conversion region is used to convert the wavelength of the incident excitation light into the stimulated light.
[0007] The fluorescent wheel of the embodiment of the present application is provided with a transmission diffusion zone and a wavelength conversion zone. When the excitation light is incident on the fluorescent wheel in a time sequence, the transmission diffusion zone transmits and diffuses the incident excitation light; the wavelength conversion zone converts the wavelength of the incident excitation light into a converted light; not only can at least one converted light be obtained through the excitation light, but the coherence of the transmitted excitation light can be further reduced through diffusion, which is beneficial to reducing the speckle of the projected image of the optical machine using the fluorescent wheel; when the excitation light includes two beams of light with different wavelengths, two transmission diffusion zones and one wavelength conversion zone can be provided, and the two transmission diffusion zones respectively transmit and diffuse the two beams of light with different wavelengths, and the wavelength conversion zone converts the wavelength of one of the excitation light beams into a converted light, so that three primary colors of light with different wavelengths can be obtained, which is beneficial to reducing the cost of the optical machine using the fluorescent wheel.
[0008] In one embodiment, the transmission diffusion region includes a first transmission layer and a diffusion layer stacked along the axial direction of the fluorescent wheel;
[0009] The first transmission layer is used to transmit the incident excitation light; the diffusion layer is used to diffuse the incident excitation light.
[0010] In one embodiment, the diffusion layer includes a first diffusion sublayer and a second diffusion sublayer, and the first diffusion sublayer, the first transmission layer, and the second diffusion sublayer are stacked along the axial direction of the fluorescent wheel; the first diffusion sublayer and the second diffusion sublayer are respectively used to diffuse the incident excitation light.
[0011] In one embodiment, the transmission diffusion region has a first light incident surface and a first light emitting surface; and a rough structure is formed on the first light incident surface and / or the first light emitting surface.
[0012] In one embodiment, the wavelength conversion region includes a second transmission layer and a wavelength conversion layer that are adjacently arranged;
[0013] The second transmission layer is used to transmit the incident excitation light, and the wavelength conversion layer is used to convert the wavelength of the incident excitation light and then output it.
[0014] In one embodiment, the second transmission layer and the wavelength conversion layer are disposed adjacent to each other around the axial direction of the fluorescent wheel; or,
[0015] The second transmission layer is nested adjacent to the wavelength conversion layer in radial direction.
[0016] In one embodiment, the second transmission layer is a hollow layer opened in the fluorescent wheel.
[0017] In one embodiment, the wavelength conversion region includes a second light emitting surface, and the second light emitting surface is used to emit the converted light; wherein:
[0018] The fluorescent wheel includes at least two wavelength conversion areas, and the areas of the second light-emitting surfaces of at least two wavelength conversion areas are different; and / or, the fluorescent wheel also includes a color filter element, which is arranged on the side of the wavelength conversion area where the second light-emitting surface is arranged, and the color filter element is used to receive and filter the converted light.
[0019] In one embodiment, the fluorescent wheel is capable of translating in at least one direction to drive the transmission diffusion region and the wavelength conversion region to translate; and / or,
[0020] The fluorescent wheel can rotate to drive the transmission diffusion area and the wavelength conversion area to rotate.
[0021] In a second aspect, the present application also relates to an optical machine, comprising: a light source module, for emitting excitation light; and
[0022] As in any of the above embodiments, the fluorescent wheel is movably disposed on the optical path of the excitation light, so that the excitation light can be incident on the transmission diffusion area and the wavelength conversion area located at different positions on the fluorescent wheel in a timely manner.
[0023] The optical machine of the embodiment of the present application is provided with a light source module to emit excitation light, and the fluorescent wheel is movably arranged on the optical path of the excitation light, so that the excitation light is incident on the transmission diffusion area and the wavelength conversion area located at different positions on the fluorescent wheel in a time sequence; the transmission diffusion area is used to transmit and diffuse the incident excitation light; the wavelength conversion area is used to receive the incident excitation light, and convert the incident excitation light into a converted light with a different wavelength and then transmit the converted light, so that not only the converted light can be obtained by the excitation light, but also the coherence of the transmitted excitation light can be further reduced by diffusion, which is beneficial to reducing the speckle of the projected image of the optical machine; two transmission diffusion areas and a wavelength conversion area can be provided, and the two transmission diffusion areas respectively transmit and diffuse two different wavelengths of excitation light, and the wavelength conversion area uses one of the wavelengths of the excitation light as the converted light, so that three primary colors of light with different wavelengths can be obtained, which is beneficial to reducing the cost of the optical machine using the fluorescent wheel.
[0024] In one embodiment, the excitation light includes a first excitation light and a second excitation light; the light source module includes a first laser and a second laser, the first laser is used to emit the first excitation light, and the second laser is used to emit the second excitation light;
[0025] The emission directions of the first excitation light and the second excitation light are the same or different.
[0026] In one embodiment, the optical machine further comprises a light guiding module, and the light guiding module comprises a light combining element; wherein,
[0027] When the emission directions of the first excitation light and the second excitation light are the same, the light guiding module further comprises a reflective element arranged on the light emitting side of the first laser, and the reflective element is used to reflect the first excitation light; the light combining element is arranged on the light emitting side of the second laser, and the light combining element is used to combine the second excitation light and the first excitation light reflected by the reflective element and emit it to the fluorescent wheel; or,
[0028] When the emission directions of the first excitation light and the second excitation light are different, the light combining element is arranged at the light emitting side of the first excitation light and the second laser, and the light combining element is used to combine the first excitation light and the second excitation light and emit them to the fluorescent wheel.
[0029] In one embodiment, the fluorescent wheel includes two transmission diffusion areas, which are respectively a first transmission diffusion area and a second transmission diffusion area; the first transmission diffusion area is used to transmit and diffuse the incident first excitation light, and the second transmission diffusion area is used to transmit and diffuse the incident second excitation light.
[0030] In one embodiment, the excitation light further includes a third excitation light, and the light source module further includes a third laser for emitting the third excitation light;
[0031] The wavelength conversion region can transmit a portion of the third excitation light, and can convert the wavelength of another portion of the third excitation light into the converted light before emitting it.
[0032] In a third aspect, the present application also relates to a projection device, comprising:
[0033] An optical machine as described in any of the above embodiments.
[0034] The projection device provided in the embodiment of the present application, by setting up an optical machine as described in any of the above embodiments, can not only obtain stimulated light through excitation light, but also further reduce the coherence of the transmitted excitation light through diffusion, which is beneficial to reducing the speckle of the image projected by the projection device. BRIEF DESCRIPTION OF THE DRAWINGS
[0035] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the following is a brief introduction to the drawings required for use in the description of the embodiments. Obviously, the drawings described below are some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.
[0036] Figure 1 It is a front view schematic diagram of the fluorescent wheel of the first embodiment of the present application.
[0037] Figure 2 yes Figure 1 Section view along line AA.
[0038] Figure 3 yes Figure 1 Section view along line BB.
[0039] Figure 4 It is a front view schematic diagram of the fluorescent wheel of the first embodiment of the present application including two wavelength conversion areas.
[0040] Figure 5 It is a schematic structural diagram of the fluorescent wheel of the first embodiment of the present application including two second transmission layers.
[0041] Figure 6 It is a side view schematic diagram of the fluorescent wheel of the first embodiment of the present application.
[0042] Figure 7 It is a front view schematic diagram of the transmission diffusion area and the wavelength conversion area of the fluorescent wheel in the first embodiment of the present application when they are fan-shaped.
[0043] Figure 8 It is a front view schematic diagram of the fluorescent wheel of the second embodiment of the present application.
[0044] Fig. 9 yes Figure 8 Cross-sectional view along line CC.
[0045] Fig.10 It is a front view schematic diagram of the second transmission layer and the wavelength conversion layer of the fluorescent wheel of the second embodiment of the application when they are arranged adjacent to each other.
[0046] Fig.11 It is a front view schematic diagram of the hollow layer of the fluorescent wheel of the second embodiment of the application.
[0047] Fig.12 This is a schematic diagram of the optical path when the emission directions of the first excitation light and the second excitation light of the optical machine in Example 3 of the present application are the same.
[0048] Fig.13 This is a schematic diagram of the optical path when the emission directions of the first excitation light and the second excitation light of the optical machine in Example 3 of the present application are different.
[0049] Fig.14 It is a schematic diagram of the projection device in the fourth embodiment of the present application.
[0050] Description of main component symbols:
[0051] Fluorescent wheel 100, 200
[0052] The first transmission layer 11
[0053] The second transmission layer 12
[0054] Transmission diffusion area 2
[0055] First light incident surface 2a
[0056] First light emitting surface 2b
[0057] The first transmission diffusion region 21
[0058] The second transmission diffusion region 22
[0059] Diffusing layer 23
[0060] First diffusion sublayer 231
[0061] Second diffusion sublayer 232
[0062] Wavelength conversion zone 3
[0063] Anti-reflection layer 31
[0064] Reflective layer 32
[0065] Wavelength conversion layer 33
[0066] The second light emitting surface 331
[0067] Hollow layer 353
[0068] Color filter element 4
[0069] Driver module 5
[0070] Optical machine 600
[0071] Light source module 61
[0072] First laser 611
[0073] Second laser 612
[0074] Light guide module 62
[0075] Reflective element 621
[0076] Light combining element 622
[0077] Focusing element 623
[0078] Plane mirror 624
[0079] Control module 63
[0080] Light collecting module 64
[0081] Projection equipment 900
[0082] Excitation light L1
[0083] The first excitation light L11
[0084] Second excitation light L12
[0085] Stimulated light L2
[0086] The following specific implementation manner will further illustrate the present invention in conjunction with the above-mentioned drawings. DETAILED DESCRIPTION
[0087] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.
[0088] It should be noted that when a component is referred to as being "fixed to" another component, it may be directly on the other component or there may be a component centered thereon. When a component is referred to as being "connected to" another component, it may be directly connected to the other component or there may be a component centered thereon. The terms "vertical", "horizontal", "left", "right" and similar expressions used herein are for illustrative purposes only.
[0089] It should be noted that the concepts such as "first" and "second" mentioned in this application are only used to distinguish different devices, modules or units, and are not used to limit the order or interdependence of the functions performed by these devices, modules or units.
[0090] Embodiments 1 and 2 of the present application provide a fluorescent wheel, embodiment 3 provides an optical machine, and embodiment 4 provides a projection device.
[0091] Embodiment 1
[0092] Please also read Figure 1 and Figure 2 The fluorescent wheel 100 provided in the first embodiment of the present application includes a transmission diffusion region 2 and a wavelength conversion region 3. Specifically, the transmission diffusion region 2 is used to transmit and diffuse the incident excitation light L1. The wavelength conversion region 3 is used to convert the wavelength of the incident excitation light L1 into the stimulated light L2, that is, to convert the incident excitation light L1 into the stimulated light L2 with a different wavelength and then transmit the stimulated light L2.
[0093] The fluorescent wheel 100 of the embodiment of the present application is provided with a transmission diffusion area 2 and a wavelength conversion area 3. When the excitation light L1 is incident on the fluorescent wheel 100 in a time sequence, the transmission diffusion area 2 transmits and diffuses the incident excitation light L1, and the wavelength conversion area 3 converts the wavelength of the incident excitation light L1 into the converted light L2. Not only can at least one converted light L2 be obtained through the excitation light L1, but the coherence of the transmitted excitation light L1 can be further reduced through diffusion, which is conducive to reducing the speckle of the projected image of the optical machine using the fluorescent wheel 100. When the excitation light L1 includes two beams of light with different wavelengths, two transmission diffusion areas 2 and one wavelength conversion area 3 can be provided. The two transmission diffusion areas 2 transmit and diffuse the two beams of light with different wavelengths respectively, and the wavelength conversion area 3 converts one of the excitation light L1 into the converted light L2, so that three primary colors of light with different wavelengths can be obtained, which is conducive to reducing the cost of the optical machine using the fluorescent wheel 100.
[0094] In some embodiments, see Figure 1The transmission diffusion area 2 includes two adjacent transmission diffusion areas 2 and a wavelength conversion area 3. The two transmission diffusion areas 2 are both fan-shaped, and the two transmission diffusion areas 2 are respectively a first transmission diffusion area 21 and a second transmission diffusion area 22. The first transmission diffusion area 21 and the second transmission diffusion area 22 can respectively transmit and diffuse the excitation light L1 with different wavelengths.
[0095] The first transmission diffusion area 21 is configured to transmit and diffuse the excitation light L1 with a wavelength range of 405nm-475nm, for example, the wavelength of the excitation light L1 transmitted and diffused by the first transmission diffusion area 21 can be any value in the range of 405nm-430nm, 430nm-450nm or 450nm-475nm. The second transmission diffusion area 22 is configured to transmit and diffuse the excitation light L1 with a wavelength range of 635nm-651nm, for example, the wavelength of the excitation light L1 transmitted and diffused by the second transmission diffusion area 22 can be any value in the range of 635nm-640nm, 640nm-645nm or 645nm-651nm. By providing two transmission diffusion areas 2 to respectively transmit and diffuse the incident excitation light L1 with different wavelengths, the excitation light L1 with different wavelengths can be diffused in a targeted manner, which is beneficial to further reduce the coherence of the transmitted excitation light L1 with different wavelengths, thereby reducing the speckle of the projected image of the optical machine using the fluorescent wheel 100; and by providing a first transmission diffusion area 21 and a second transmission diffusion area 22 to respectively transmit and diffuse the incident excitation light L1 with different wavelengths, it is beneficial to further solve the problem of heat accumulation caused by multiple beams of excitation light L1 with different wavelengths incident on the same position of the fluorescent wheel 100.
[0096] Optionally, the fluorescent wheel 100 may further include one, three or more transmission diffusion regions 2; and / or, the fluorescent wheel 100 may further include two, three or more wavelength conversion regions 3, which is not limited in the present application.
[0097] Please also read Figure 1 and Figure 3 Specifically, the transmission diffusion region 2 includes a first transmission layer 11 and a diffusion layer 23 stacked along the axial direction of the fluorescent wheel 100. The first transmission layer 11 is used to transmit the incident excitation light L1, and the first transmission layer 11 is a light-transmitting material, for example, the material of the first transmission layer 11 can be any one of glass and sapphire, and the present application does not limit it.
[0098] The diffusion layer 23 is used to diffuse the incident excitation light L1 and is disposed on one side or two opposite surfaces of the first transmission layer 11 . For example, the diffusion layer 23 may be coated on a local area of one side of the first transmission layer 11 to form the transmission diffusion region 2 .
[0099] In some embodiments, please refer to Figure 1 and Figure 3 The diffusion layer 23 includes a first diffusion sublayer 231 and a second diffusion sublayer 232. The first diffusion sublayer 231, the first transmission layer 11, and the second diffusion sublayer 232 are stacked along the axial direction of the fluorescent wheel 100; the first diffusion sublayer 231 and the second diffusion sublayer 232 are respectively used to diffuse the incident excitation light L1.
[0100] By providing the transmission diffusion area 2 , the divergence angle of the transmitted excitation light L1 is increased, thereby reducing the coherence of the excitation light L1 transmitted from the transmission diffusion area 2 , thereby achieving the effect of transmitting and diffusing the excitation light L1 .
[0101] In some embodiments, please refer to Figure 1 and Figure 3 The transmission diffusion zone 2 has a first light incident surface 2a and a first light emitting surface 2b; optionally, the first light incident surface 2a and the first light emitting surface 2b are formed with a rough structure (not shown); or any one of the first light incident surface 2a and the first light emitting surface 2b is formed with a rough structure to achieve the effect of diffused transmitted excitation light L1, which is not limited in the present application.
[0102] Furthermore, the rough structure (not shown) is a structure such as a convex structure, a texture structure or a hammer texture structure that makes the surface uneven.
[0103] See also Figure 1 The wavelength conversion region 3 may also be in a fan-shaped shape. The two ends of the wavelength conversion region 3 are adjacent to the first transmission diffusion region 21 and the second transmission diffusion region 22 respectively.
[0104] In some embodiments, the wavelength conversion region 3 includes a second transmission layer 12 and a wavelength conversion layer 33 disposed adjacent to each other. The second transmission layer 12 is used to transmit the incident excitation light L1, and the wavelength conversion layer 33 is used to convert the wavelength of the incident excitation light L1 before emitting it.
[0105] In some embodiments, the wavelength conversion region 3 further includes two anti-reflection layers 31 and a reflective layer 32. The two anti-reflection layers 31 are respectively attached to the two opposite surfaces of the second transmission layer 12, and the wavelength conversion layer 33 is disposed on one side of the second transmission layer 12; the reflective layer 32 is disposed between the anti-reflection layer 31 and the wavelength conversion layer 33, and connects the anti-reflection layer 31 and the wavelength conversion layer 33. The anti-reflection layer 31, the reflective layer 32 and the wavelength conversion layer 33 are stacked.
[0106] The anti-reflection layer 31 is used to increase the transmittance of the excitation light L1 in the second transmission layer 12, so that the excitation light L1 passes through the reflection layer 32 and enters the wavelength conversion layer 33. The wavelength conversion layer 33 is used to receive the incident excitation light L1, and convert the incident excitation light L1 into the converted light L2 with a different wavelength and then transmit the converted light L2.
[0107] The wavelength conversion layer 33 in the wavelength conversion region 3 includes a second light emitting surface 331, and the second light emitting surface 331 is used to emit the converted light L2. The reflective layer 32 is configured to reflect a portion of the converted light L2 emitted from the wavelength conversion layer 33, so that the converted light L2 is emitted in a direction away from the first transmission layer 11, that is, the converted light L2 is emitted from the second light emitting surface 331.
[0108] Please also read Figure 2 and Figure 4 In some embodiments, the fluorescent wheel 100 includes at least two wavelength conversion regions 3, and the second light emitting surfaces 331 of the at least two wavelength conversion regions 3 have different area sizes, so that the duty ratios of the converted light L2 emitted from different wavelength conversion regions 3 are different. For example, the fluorescent wheel 100 includes two wavelength conversion regions 3, and the second light emitting surfaces 331 of the two wavelength conversion regions 3 have different area sizes. Specifically, the material of the wavelength conversion layer 33 of one wavelength conversion zone 3 is a green phosphor material, and the material of the wavelength conversion layer 33 of the other wavelength conversion zone 3 is a purple phosphor material, and the area of the second light emitting surface 331 of the wavelength conversion zone 3 of the green phosphor material is larger than the area of the second light emitting surface 331 of the wavelength conversion zone 3 of the purple phosphor material, so that when the excitation light L1 is incident on the two wavelength conversion zones 3 at a uniform speed in a time sequence, the duration of the excitation light L1 irradiating the wavelength conversion zone 3 of the green phosphor material and the duration of the excitation light L1 irradiating the wavelength conversion zone 3 of the purple phosphor material are different, so that the duty cycles of the converted light L2 emitted from different wavelength conversion zones 3 are different, that is, the duty cycles of the green converted light L2 and the purple converted light L2 are different.
[0109] In some embodiments, the material of the wavelength conversion layer 33 is a phosphor or a phosphor ceramic material. For example, the material of the wavelength conversion layer 33 may be yellow yttrium aluminum garnet doped with trivalent cerium. The material of the wavelength conversion layer 33 may also be any one of an oxide ceramic material, a nitride ceramic material, and a nitride oxide ceramic material, which is not limited in the present application. For example, when the material of the wavelength conversion layer 33 is a green phosphor material, the excitation light L1 is blue light, and the wavelength conversion layer 33 is used to convert the blue excitation light L1 into a green converted light L2, and transmit the green converted light L2 from the second light emitting surface 331.
[0110] Please also refer to Figure 1 and Figure 2In some embodiments, the fluorescent wheel 100 further includes a color filter element 4. The color filter element 4 is used to receive the converted light L2, and the color filter element 4 is disposed on the side of the wavelength conversion region 3 where the second light exiting surface 331 is disposed. The color filter element 4 is used to receive and filter the converted light L2, that is, to reduce the spectrum width of the converted light L2 transmitted from the second light exiting surface 331. By providing the color filter element 4, it is helpful to reduce the color brightness of the converted light L2 emitted from the wavelength conversion region 3, thereby helping to reduce the stimulation of the converted light L2 to the human eye, and helping to increase the visual saturation of the human eye when viewing the image generated by the converted light L2, thereby helping to improve the user experience.
[0111] Please also refer to Figure 1 and Figure 5 In some embodiments, the wavelength conversion region 3 includes two second transmission layers 12 formed of a light-transmitting material, and the two second transmission layers 12 are arranged opposite to each other and spaced apart. The wavelength conversion layer 33 is sandwiched between the two second transmission layers 12. Two anti-reflection layers 31 are directly attached to the opposite two side surfaces of a second transmission layer 12, wherein one anti-reflection layer 31 is stacked with a reflective layer 32 and a wavelength conversion layer 33, and the reflective layer 32 is arranged between the anti-reflection layer 31 and the wavelength conversion layer 33, which is not limited in the present application.
[0112] The wavelength conversion layer 33 is used to receive the excitation light L1 transmitted from one second transmission layer 12, and convert the excitation light L1 into the converted light L2 with a different wavelength, and then transmit the converted light L2. The other second transmission layer 12 transmits the converted light L2 emitted from the wavelength conversion layer 33; the color filter element 4 is attached to the second light emitting surface 331 to reduce the brightness of the color of the converted light L2 emitted from the wavelength conversion area 3.
[0113] Please also read Figure 6 and Figure 7 In some embodiments, the fluorescent wheel 100 can translate in at least one direction to drive the transmissive diffusion area 2 and the wavelength conversion area 3 to translate; and / or the fluorescent wheel 100 can rotate to drive the transmissive diffusion area 2 and the wavelength conversion area 3 to rotate. By setting the fluorescent wheel 100 movable to drive the two transmissive diffusion areas 2 and the one wavelength conversion area 3 to translate and / or rotate, when the emission direction of the excitation light L1 remains unchanged, it is beneficial to make the excitation light L1 incident on the two transmissive diffusion areas 2 and the one wavelength conversion area 3 on the first transmission layer 11 in a time sequence.
[0114] Specifically, for example, the fluorescent wheel 100 can rotate around the axis of the center of the first transmission layer 11 under the drive of a driver (not shown) to drive the two transmission diffusion areas 2 and the one wavelength conversion area 3 to rotate, so that the excitation light is incident on the two transmission diffusion areas 2 and the one wavelength conversion area 3 in sequence. In some embodiments, when the two transmission diffusion areas 2 and the one wavelength conversion area 3 are fan-shaped, the fluorescent wheel 100 can translate along at least one direction perpendicular to the extension direction of its own optical axis, so that the excitation light L1 can be incident on the two transmission diffusion areas 2 and the one wavelength conversion area 3 located at different positions.
[0115] Embodiment 2
[0116] Please also read Figure 8 , Fig. 9 and Fig.10 The fluorescent wheel 200 provided in the second embodiment of the present application is different from the fluorescent wheel 100 in the first embodiment in that the second transmission layer 12 and the wavelength conversion layer 33 are adjacently arranged around the axial direction of the fluorescent wheel 200, the second transmission layer 12 transmits part of the excitation light L1, and the wavelength conversion layer 33 converts part of the incident excitation light L1 into the converted light L2 with a different wavelength and then transmits the converted light L2, so that the excitation light L1 and the converted light L2 are emitted from the wavelength conversion area 3.
[0117] The fluorescent wheel 200 of the second embodiment of the present application sets the wavelength conversion zone 3 to transmit part of the excitation light L1, and converts the incident part of the excitation light L1 into the converted light L2 with different wavelength and then transmits the converted light L2, so that the excitation light L1 and the converted light L2 are emitted from the wavelength conversion zone 3. Not only can at least one converted light L2 be obtained from the excitation light L1, but also a plurality of colors of light can be emitted by mixing the transmitted part of the excitation light L1 and the converted converted light L2, so that multi-color light of different wavelengths can be obtained, which is beneficial to reducing the cost of the optical machine using the fluorescent wheel 200.
[0118] In some embodiments, the second transmission layer 12 and the wavelength conversion layer 33 are nested adjacent to each other along the radial direction of the fluorescent wheel 100 , that is, the second transmission layer 12 is nested concentrically around the wavelength conversion layer 33 . Optionally, the wavelength conversion layer 33 is nested concentrically around the second transmission layer 12 , which is not limited in the present application.
[0119] In some embodiments, the wavelength conversion region 3 further includes two anti-reflection layers 31 and a reflective layer 32. The two anti-reflection layers 31 are respectively attached to the opposite two side surfaces of the second transmission layer 12. The wavelength conversion layer 33 is arranged on one side of the second transmission layer 12; the reflective layer 32 is arranged between the anti-reflection layer 31 and the wavelength conversion layer 33, and connects the anti-reflection layer 31 and the wavelength conversion layer 33. The anti-reflection layer 31, the reflective layer 32 and the wavelength conversion layer 33 are stacked.
[0120] For example, when the material of the wavelength conversion layer 33 is a green phosphor material, the excitation light L1 is blue light, and the wavelength conversion layer 33 is used to convert part of the incident blue excitation light L1 into a green converted light L2, and transmit the green converted light L2; the second transmission layer 12 transmits part of the blue excitation light L1, so that the blue excitation light L1 and the green converted light L2 are emitted from the wavelength conversion area 3.
[0121] See also Fig.11 In some embodiments, the second transmission layer 12 is a hollow layer 353 provided in the fluorescent wheel 200. The hollow layer 353 is used to allow part of the incident excitation light L1 to pass through, so that the excitation light L1 and the converted light L2 are emitted from the wavelength conversion area 3. Optionally, the hollow layer 353 and the wavelength conversion layer 33 are arranged adjacent to each other, or the hollow layer 353 and the wavelength conversion layer 33 are arranged concentrically and nested, which is not limited in the present application. By providing the hollow layer 353, it is beneficial to reduce the volume of the fluorescent wheel while transmitting part of the excitation light L1 and emitting the converted light L2 with different wavelengths, so as to further reduce the volume of the optical machine using the fluorescent wheel 200.
[0122] Furthermore, the hollow layer 353 is a hollow gap opened on the fluorescent wheel, so as to avoid the excitation light loss when the excitation light L1 passes through the hollow layer 353 .
[0123] Embodiment 3
[0124] Please also read Figure 1 and Fig.12 , the optical machine 600 provided in the third embodiment of the present application includes a light source module 61 and a fluorescent wheel 100 (or 200) in any of the above embodiments. The light source module 61 is used to emit the excitation light L1. The fluorescent wheel 100 (or 200) is movably arranged on the optical path of the excitation light L1, so that the excitation light L1 can be incident on the transmission diffusion area 2 and the wavelength conversion area 3 located at different positions on the fluorescent wheel 100 (or 200) in a time sequence. The transmission diffusion area 2 of the fluorescent wheel 100 (or 200) is used to transmit and diffuse the incident excitation light L1; the wavelength conversion area 3 is used to receive the incident excitation light L1, and the wavelength conversion area 3 is also used to convert the incident excitation light L1 into a stimulated light L2 with a different wavelength and then transmit the stimulated light L2.
[0125] In some embodiments, the excitation light L1 includes at least two lights with different wavelengths (for example, the excitation light L1 includes a first excitation light L11 and a second excitation light L12. The fluorescent wheel 100 (or 200) includes two transmission diffusion regions 2 and a wavelength conversion region 3. The two transmission diffusion regions 2 are respectively a first transmission diffusion region 21 and a second transmission diffusion region 22. The first transmission diffusion region 21 is used to transmit and diffuse the incident first excitation light L11, and the second transmission diffusion region 22 is used to transmit and diffuse the incident second excitation light L12.
[0126] The optical machine 600 of the embodiment of the present application can not only obtain the converted light L2 through the excitation light L1, but also further reduce the coherence of the transmitted excitation light L1 through diffusion, which is beneficial to reducing the speckle of the projected image of the optical machine 600; and the excitation light L1 includes the first excitation light L11 and the second excitation light L12, and two transmission diffusion areas 2 and a wavelength conversion area 3 can be set. The two transmission diffusion areas 2 transmit and diffuse the first excitation light L11 and the second excitation light L12 respectively, and the wavelength conversion area 3 converts the first excitation light L11 or the second excitation light L12 into the converted light L2, so that three primary colors of light with different wavelengths can be obtained, which is beneficial to reducing the cost of the optical machine 600 using the fluorescent wheel 100 (or 200).
[0127] In some embodiments, the optical machine 600 includes a light guiding module 62, which is arranged on the optical path of the excitation light L1, and is used to receive and guide the excitation light L1 to be emitted. The light source module 61 includes a first laser 611 and a second laser 612 arranged on the same side, the first laser 611 is used to emit the first excitation light L11, and the second laser 612 is used to emit the second excitation light L12, and the emission directions of the first excitation light L11 and the second excitation light L12 are the same. The first laser 611 includes a plurality of blue laser diodes, and the wavelength range of the first excitation light L11 is 405nm-475nm; the second laser 612 includes a plurality of red laser diodes, and the wavelength range of the second excitation light L12 is 635nm-651nm. By setting the first laser 611, the second laser 612 and the fluorescent wheel 100 (or 200), the fluorescent wheel 100 transmits and diffuses the first excitation light L11 and the second excitation light L12, and converts the first excitation light L11 or the second excitation light L12 into the stimulated light L2, which is beneficial to reducing the coherence of the emitted first excitation light L11 and the second excitation light L12, and is beneficial to reducing the speckle of the displayed image of the optical machine 600; compared with other optical machines with a speckle elimination element, the optical machine 600 of the embodiment of the present application is beneficial to reducing the overall volume and reducing the cost of the optical machine 600.
[0128] The light guiding module 62 includes a reflective element 621 and a light combining element 622. The reflective element 621 is arranged on the light emitting side of the first laser 611, and is used to reflect the first excitation light L11. The light combining element 622 is arranged on the light emitting side of the second laser 612, and is used to reflect the second excitation light L12 and transmit the first excitation light L11.
[0129] In some embodiments, the light guiding module 62 also includes a focusing element 623 and a plane mirror 624, the focusing element 623 is used to receive and converge the excitation light L1 emitted from the light combining element 622, and the plane mirror 624 is used to reflect the excitation light L1 emitted from the focusing element 623, so that the first excitation light L11 and the second excitation light L12 are incident on the fluorescent wheel 100 (or 200).
[0130] Please also read Figure 1 and Fig.13 In some embodiments, the emission directions of the first excitation light L11 and the second excitation light L12 are different. The light guiding module 62 only includes a light combining element 622, a focusing element 623 and a plane mirror 624. The light combining element 622 is arranged on the light emitting side of the first excitation light L11 and the second laser 612. The light combining element 622 is used to reflect the first excitation light L11 and transmit the second excitation light L12. The focusing element 623 is used to receive and converge the excitation light L1 emitted from the light combining element 622. The plane mirror 624 is used to reflect the excitation light L1 emitted from the focusing element 623, so that the first excitation light L11 and the second excitation light L12 are incident on the fluorescent wheel 100 (or 200).
[0131] In some embodiments, the excitation light L1 also includes a third excitation light (not shown), and the light source module 1 also includes a third laser (not shown) for emitting the third excitation light; the wavelength conversion zone 3 can transmit part of the third excitation light, and can convert the wavelength of another part of the third excitation light into the excited light L2 before emitting it.
[0132] For example, when the first excitation light L11 is a green laser, the second excitation light L12 is a red laser, the third excitation light is a blue laser, and the wavelength conversion zone 3 of the fluorescent wheel 100 (or 200) includes a yellow fluorescent material, part of the third excitation light incident on the wavelength conversion zone 3 is transmitted, and another part of the third excitation light incident on the wavelength conversion zone 3 is converted into the yellow converted light L2 and then transmitted out, so that the blue third excitation light and the yellow converted light L2 are emitted from the wavelength conversion zone 3, and the red second excitation light L12 and the green first excitation light L11 are transmitted and diffused from the first transmission diffusion zone 21 and the second transmission diffusion zone 22 respectively, so that blue, yellow, red and green light can be obtained within one rotation cycle of the fluorescent wheel 100 (or 200), and then white light can be obtained, and multiple lights of different colors can be obtained, and the coherence of the transmitted excitation light L1 can be further reduced by diffusion, which is beneficial to reduce the cost of the optical machine using the fluorescent wheel 100 (or 200).
[0133] In some embodiments, the optical machine 600 also includes a driving module 5, which is used to drive the fluorescent wheel 100 (or 200) to rotate around the central axis of the fluorescent wheel 100 (or 200) relative to the light guiding module 62, so as to drive the two transmission diffusion zones 2 and the wavelength conversion zone 3 to rotate, so that the excitation light L1 is incident on the transmission diffusion zones 2 and the wavelength conversion zones 3 located at different positions.
[0134] In some embodiments, the optical machine 600 further includes a control module 63, which is used to control the duration of the excitation light L1 incident on the transmission diffusion area 2 and the wavelength conversion area 3 located at different positions. Specifically, the control module 63 controls the duration of the excitation light L2 being emitted by controlling the duration of the first excitation light L11 and / or the second excitation light L12 being incident on the wavelength conversion area 3; controls the duration of the first excitation light L11 being incident on the first transmission diffusion area 21 to control the duration of the first excitation light L11 being transmitted and diffused; controls the duration of the second excitation light L12 being incident on the second transmission diffusion area 22 to control the duration of the second excitation light L12 being transmitted and diffused. For example, in one rotation / translation cycle of the fluorescent wheel 100 (or 200), when the fluorescent wheel 100 (or 200) When the first transmission diffusion zone 21 is located on the optical path of the light source module 61, the control module controls the light source module 61 to emit the first excitation light L11; when the second transmission diffusion zone 22 of the fluorescent wheel 100 (or 200) is located on the optical path of the light source module 61, the control module 63 controls the light source module 61 to emit the second excitation light L12; when the wavelength conversion zone 3 of the fluorescent wheel 100 (or 200) is located on the optical path of the light source module 61, the control module 63 controls the light source module 61 to emit the first excitation light L11 and / or the second excitation light L12 to convert the incident excitation light L1 into the excitation light L2 with a different wavelength and then transmit the excitation light L2.
[0135] In some embodiments, the optical machine 600 further includes a light collecting module 64, which is disposed on the light emitting side of the fluorescent wheel 100 (or 200). The light collecting module 64 is used to receive the stimulated light L2 and / or the excitation light L1 emitted from the fluorescent wheel 100 (or 200).
[0136] Embodiment 4
[0137] Please also read Figure 1 , Fig.12 and Fig.14 The projection device 900 provided in the fourth embodiment of the present application includes the optical machine 600 in any of the above embodiments. The projection device 900 can be an electronic device with a projection function such as a projector or a projector. The control module 63 of the optical machine 600 can be used as a main control circuit board or as an auxiliary circuit board electrically connected to the main control circuit board.
[0138] The projection device 900 provided in the embodiment of the present application, by setting an optical machine 600 as in any of the above-mentioned embodiments, can not only obtain the stimulated light L2 through the excitation light L1, but also can further reduce the coherence of the transmitted excitation light L1 through diffusion, which is beneficial to reducing the speckle of the image projected by the projection device 900; and when the excitation light L1 includes at least two light rays with different wavelengths, two transmission diffusion zones 2 and a wavelength conversion zone 3 can be set, and the two transmission diffusion zones 2 respectively transmit and diffuse the two different wavelengths of excitation light L1, and the wavelength conversion zone 3 converts one of the wavelengths of the excitation light L1 into the stimulated light L2, so that three primary colors of light with different wavelengths can be obtained, which is beneficial to reducing the cost of the projection device 900 using the optical machine 600.
[0139] The above descriptions are merely embodiments of the present application and are not intended to limit the patent scope of the present application. Any equivalent structure or equivalent process transformation made using the contents of the present application specification and drawings, or directly or indirectly applied in other related technical fields, are also included in the patent protection scope of the present application.
Claims
1. A fluorescent wheel, characterized in that: include: A transmission diffusion region, used for transmitting and diffusing incident excitation light; as well as The wavelength conversion region is used to convert the wavelength of the incident excitation light into the stimulated light.
2. The fluorescent wheel according to claim 1, characterized in that: The transmission diffusion area includes a first transmission layer and a diffusion layer stacked along the axial direction of the fluorescent wheel; The first transmission layer is used to transmit the incident excitation light; the diffusion layer is used to diffuse the incident excitation light.
3. The fluorescent wheel according to claim 2, characterized in that: The diffusion layer includes a first diffusion sublayer and a second diffusion sublayer, wherein the first diffusion sublayer, the first transmission layer and the second diffusion sublayer are stacked along the axial direction of the fluorescent wheel; the first diffusion sublayer and the second diffusion sublayer are respectively used for diffusing the incident excitation light.
4. The fluorescent wheel according to claim 1, characterized in that: The transmission diffusion region has a first light incident surface and a first light emitting surface; the first light incident surface and / or the first light emitting surface is formed with a rough structure.
5. The fluorescent wheel according to claim 1, characterized in that: The wavelength conversion region includes a second transmission layer and a wavelength conversion layer that are adjacently arranged; The second transmission layer is used to transmit the incident excitation light, and the wavelength conversion layer is used to convert the wavelength of the incident excitation light and then emit it.
6. The fluorescent wheel according to claim 5, characterized in that: The second transmission layer and the wavelength conversion layer are disposed adjacent to each other around the axial direction of the fluorescent wheel; or, The second transmission layer and the wavelength conversion layer are adjacently and nestedly arranged along the radial direction of the fluorescent wheel.
7. The fluorescent wheel according to claim 5, characterized in that: The second transmission layer is a hollow layer opened on the fluorescent wheel.
8. The fluorescent wheel according to any one of claims 1 to 7, characterized in that: The wavelength conversion region includes a second light emitting surface, and the second light emitting surface is used to emit the converted light; wherein: The fluorescent wheel comprises at least two wavelength conversion areas, and the second light emitting surfaces of at least two wavelength conversion areas have different areas; and / or, The fluorescent wheel further includes a color filter element, which is disposed on a side of the wavelength conversion region where the second light emitting surface is disposed, and is used for receiving and filtering the converted light.
9. The fluorescent wheel according to any one of claims 1 to 7, characterized in that: The fluorescent wheel can translate in at least one direction to drive the transmission diffusion area and the wavelength conversion area to translate; and / or, The fluorescent wheel can rotate to drive the transmission diffusion area and the wavelength conversion area to rotate.
10. An optical machine, characterized in that: include: A light source module, used for emitting excitation light; as well as According to any one of claims 1 to 9, the fluorescent wheel is movably disposed on the optical path of the excitation light, so that the excitation light can be incident on the transmission diffusion area and the wavelength conversion area located at different positions on the fluorescent wheel in a timely manner.
11. The optical machine according to claim 10, characterized in that: The excitation light includes a first excitation light and a second excitation light; the light source module includes a first laser and a second laser, the first laser is used to emit the first excitation light, and the second laser is used to emit the second excitation light; The emission directions of the first excitation light and the second excitation light are the same or different.
12. The optical machine according to claim 11, characterized in that: The optical machine further includes a light guiding module, and the light guiding module includes a light combining element; wherein, When the emission directions of the first excitation light and the second excitation light are the same, the light guiding module further comprises a reflective element arranged on the light emitting side of the first laser, and the reflective element is used to reflect the first excitation light; the light combining element is arranged on the light emitting side of the second laser, and the light combining element is used to combine the second excitation light and the first excitation light reflected by the reflective element and emit it to the fluorescent wheel; or, When the emission directions of the first excitation light and the second excitation light are different, the light combining element is arranged at the light emitting side of the first excitation light and the second laser, and the light combining element is used to combine the first excitation light and the second excitation light and emit them to the fluorescent wheel.
13. The optical machine according to claim 11, characterized in that: The fluorescent wheel includes two transmission diffusion areas, which are respectively a first transmission diffusion area and a second transmission diffusion area that are adjacent to each other; the first transmission diffusion area is used to transmit and diffuse the incident first excitation light, and the second transmission diffusion area is used to transmit and diffuse the incident second excitation light.
14. The optical machine according to claim 13, characterized in that: The excitation light further includes a third excitation light, and the light source module further includes a third laser for emitting the third excitation light; The wavelength conversion region can transmit a portion of the third excitation light, and can convert the wavelength of another portion of the third excitation light into the converted light before emitting it.
15. A projection device, characterized in that: include: An optical machine as claimed in any one of claims 1 to 14.