Fluorescent wheel, ray machine and projection equipment
By combining a transmission diffusion region and a wavelength conversion region in the phosphor wheel, the speckle problem caused by high excitation light coherence in laser projection equipment is solved, achieving the effect of reducing excitation light coherence and cost.
Patent Information
- Application Number
- CN202423321837.4
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-12-31
- Publication Date
- 2026-01-09
- Estimated Expiration
- 2034-12-31
AI Technical Summary
Existing laser projection equipment uses monochromatic laser diodes as the main light source, resulting in high coherence of the excitation light emitted from the phosphor wheel, which causes speckle problems in the projected image.
The design employs a combination of a transmission diffusion region and a wavelength conversion region. The transmission diffusion region transmits and diffuses the incident excitation light, while the wavelength conversion region converts the wavelength of the incident excitation light into the wavelength of the laser light. By setting up two transmission diffusion regions and one wavelength conversion region, two excitation lights of different wavelengths are processed respectively, reducing the coherence of the excitation light and obtaining three primary color lights of different wavelengths.
It effectively reduces speckle in the projected image, lowers the cost of the optical engine, and improves the performance of the optical engine through the combined design of diffusion and conversion zones.
Smart Images
Figure CN223784565U_ABST
Abstract
Description
Technical Field
[0001] This application relates to the field of projection technology, and in particular to a fluorescent wheel, an optical engine, and a projection device. Background Technology
[0002] Current laser projection equipment still uses monochromatic laser diodes as the main light source. By illuminating the excitation light emitted from the monochromatic laser diode onto a rotating phosphor wheel, multiple beams of light with different wavelengths are obtained, or direct excitation light is obtained. However, the excitation light directly emitted from the phosphor wheel has high coherence, which leads to speckle problems in the images projected by laser projection equipment. Utility Model Content
[0003] This application discloses a phosphor wheel, an optomechanic, and a projection device to reduce the coherence of the excitation light emitted from the phosphor wheel.
[0004] Firstly, this application relates to a fluorescent wheel, comprising:
[0005] A transmission diffusion region, used to transmit and diffuse the incident excitation light; and
[0006] A wavelength conversion region is used to convert the wavelength of the incident excitation light into that of the laser.
[0007] The fluorescent wheel of this application embodiment, by setting a transmission diffusion region and a wavelength conversion region, allows the transmission diffusion region to transmit and diffuse the incident excitation light when excitation light is incident on the fluorescent wheel in a sequential manner; the wavelength conversion region converts the wavelength of the incident excitation light into a laser beam. Not only can at least one laser beam be obtained through the excitation light, but the coherence of the transmitted excitation light can also be further reduced through diffusion, which is beneficial to reducing the speckle of the projected image of the optomechanic using this fluorescent wheel. When the excitation light includes two beams of light with different wavelengths, by setting two transmission diffusion regions and one wavelength conversion region, the two transmission diffusion regions respectively transmit and diffuse the two beams of light with different wavelengths, and the wavelength conversion region converts the wavelength of one of the excitation light beams into a laser beam, thereby obtaining three primary color lights of different wavelengths, which is beneficial to reducing the cost of the optomechanic using this 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 transmissive layer is used to transmit the incident excitation light; the diffuser layer is used to diffuse the incident excitation light.
[0010] In one embodiment, the diffuse layer includes a first diffuse sublayer and a second diffuse sublayer, wherein the first diffuse sublayer, the first transmissive layer, and the second diffuse sublayer are stacked along the axial direction of the phosphor wheel; the first diffuse sublayer and the second diffuse 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-exiting surface; the first light-incident surface and / or the first light-exiting surface are formed with a rough structure.
[0012] In one embodiment, the wavelength conversion region includes a second transmission layer and a wavelength conversion layer disposed adjacent to each other;
[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.
[0014] In one embodiment, the second transmission layer and the wavelength conversion layer are disposed adjacent to each other axially around the phosphor wheel; or,
[0015] The second transmission layer is radially adjacent to and nested with the wavelength conversion layer.
[0016] In one embodiment, the second transmissive layer is a perforated layer formed on the fluorescent wheel.
[0017] In one embodiment, the wavelength conversion region includes a second light-emitting surface, which is used to emit the received laser light; wherein:
[0018] The fluorescent wheel includes at least two wavelength conversion regions, and the second light-emitting surfaces of the at least two wavelength conversion regions have different area sizes; and / or, the fluorescent wheel further includes a color filter element, which is disposed on the side of the wavelength conversion region where the second light-emitting surface is disposed, and the color filter element is used to receive and filter the laser light.
[0019] In one embodiment, the fluorescent wheel is capable of translation along 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 region and the wavelength conversion region to rotate.
[0021] Secondly, this application also relates to an optomechanic, comprising: a light source module for emitting excitation light; and
[0022] As described 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 sequentially onto the transmission diffusion region and the wavelength conversion region located at different positions on the fluorescent wheel.
[0023] The optomechanism of this application embodiment emits excitation light from a light source module. The phosphor wheel is movably disposed on the optical path of the excitation light, so that the excitation light is incident sequentially onto the transmission diffusion region and the wavelength conversion region located at different positions on the phosphor wheel. The transmission diffusion region is used to transmit and diffuse the incident excitation light. The wavelength conversion region is used to receive the incident excitation light and convert the incident excitation light into a laser beam of a different wavelength before transmitting the laser beam. Not only can a laser beam be obtained from the excitation light, but the coherence of the transmitted excitation light can also be further reduced through diffusion, which is beneficial to reducing the speckle of the projected image of the optomechanism. By setting two transmission diffusion regions and one wavelength conversion region, the two transmission diffusion regions transmit and diffuse two different wavelengths of excitation light respectively, and the wavelength conversion region converts one wavelength of excitation light into a laser beam, thereby obtaining three primary color lights of different wavelengths, which is beneficial to reducing the cost of the optomechanism using the phosphor 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, wherein 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 first excitation light and the second excitation light may have the same or different emission directions.
[0026] In one embodiment, the optomechanism further includes a light guiding module, which includes a light combining element; wherein,
[0027] When the first excitation light and the second excitation light are emitted in the same direction, the light guiding module further includes a reflective element disposed on the light-emitting side of the first laser, the reflective element being used to reflect the first excitation light; the light-combining element is disposed on the light-emitting side of the second laser, the light-combining element being used to combine the second excitation light and the first excitation light reflected by the reflective element and emit them onto the phosphor wheel; or...
[0028] When the emission directions of the first excitation light and the second excitation light are different, the light combining element is disposed on 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 phosphor wheel.
[0029] In one embodiment, the fluorescent wheel includes two transmission diffusion regions, namely a first transmission diffusion region and a second transmission diffusion region; the first transmission diffusion region is used to transmit and diffuse the incident first excitation light, and the second transmission diffusion region 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 another portion of the third excitation light wavelength into the wavelength of the laser-exposed light.
[0032] Thirdly, this application also relates to a projection device, comprising:
[0033] The optical engine as described in any of the above embodiments.
[0034] The projection device provided in this application embodiment, by setting up an optical engine as described in any of the above embodiments, can not only obtain laser light through excitation light, but also further reduce the coherence of the transmitted excitation light through diffusion, which is beneficial to reduce the speckle of the projected image. Attached Figure Description
[0035] To more clearly illustrate the technical solutions in the embodiments of this application, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.
[0036] Figure 1 This is a front view schematic diagram of the fluorescent wheel in Embodiment 1 of this application.
[0037] Figure 2 yes Figure 1 A sectional view along line AA.
[0038] Figure 3 yes Figure 1 Sectional view along line BB.
[0039] Figure 4 This is a frontal view of the fluorescent wheel in Embodiment 1 of this application, which includes two wavelength conversion regions.
[0040] Figure 5 This is a schematic diagram of the structure of the fluorescent wheel in Embodiment 1 of this application, including two second transmission layers.
[0041] Figure 6 This is a side view schematic diagram of the fluorescent wheel in Embodiment 1 of this application.
[0042] Figure 7 This is a frontal view of the fluorescent wheel in Embodiment 1 of this application when the transmission diffusion region and wavelength conversion region are fan-shaped.
[0043] Figure 8This is a front view schematic diagram of the fluorescent wheel in Embodiment 2 of this application.
[0044] Figure 9 yes Figure 8 A sectional view along line CC.
[0045] Figure 10 This is a frontal view of the fluorescent wheel in Embodiment 2 when the second transmission layer and the wavelength conversion layer are arranged adjacently.
[0046] Figure 11 This is a front view schematic diagram of the hollowed-out layer of the fluorescent wheel in the second embodiment of the application.
[0047] Figure 12 This is a schematic diagram of the optical path when the first excitation light and the second excitation light of the optomechanism in Embodiment 3 of this application have the same emission direction.
[0048] Figure 13 This is a schematic diagram of the optical path when the first excitation light and the second excitation light of the optomechanism in Embodiment 3 of this application have different emission directions.
[0049] Figure 14 This is a schematic diagram of the projection device in Embodiment 4 of this application.
[0050] Explanation of key component symbols:
[0051] Fluorescent wheels 100, 200
[0052] First Transmissive Layer 11
[0053] Second transmission layer 12
[0054] Transmission diffusion region 2
[0055] First incident light plane 2a
[0056] First light-emitting surface 2b
[0057] First transmission diffusion region 21
[0058] Second transmission diffusion region 22
[0059] Diffuse layer 23
[0060] First diffuse sublayer 231
[0061] Second diffuse sublayer 232
[0062] Wavelength conversion region 3
[0063] Anti-reflective layer 31
[0064] Reflective layer 32
[0065] Wavelength conversion layer 33
[0066] Second light-emitting surface 331
[0067] 353 hollow layer
[0068] Color filter element 4
[0069] Drive Module 5
[0070] Optical Engine 600
[0071] Light source module 61
[0072] First laser 611
[0073] Second laser 612
[0074] Light guiding module 62
[0075] Reflective element 621
[0076] Photosynthetic 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] First excitation light L11
[0084] Second excitation light L12
[0085] Laser L2
[0086] The following detailed description, in conjunction with the accompanying drawings, will further illustrate the present invention. Detailed Implementation
[0087] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this application, and not all of them. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.
[0088] It should be noted that when a component is described as "fixed to" another component, it can be directly on the other component or there may be an intervening component. When a component is described as "connected to" another component, it can be directly connected to the other component or there may be an intervening component. The terms "vertical," "horizontal," "left," "right," and similar expressions used in this article are for illustrative purposes only.
[0089] It should be noted that the concepts of "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 of functions performed by these devices, modules or units or their interdependencies.
[0090] This application provides a fluorescent wheel in Embodiments 1 and 2, an optical engine in Embodiment 3, and a projection device in Embodiment 4.
[0091] Example 1
[0092] Please refer to the following: Figure 1 and Figure 2 The fluorescent wheel 100 provided in Embodiment 1 of this 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 wavelength of the received laser L2, that is, to convert the incident excitation light L1 into the wavelength of the received laser L2 and then transmit the received laser L2.
[0093] The phosphor wheel 100 of this embodiment, by providing a transmission diffusion region 2 and a wavelength conversion region 3, allows the excitation light L1 to be incident on the phosphor wheel 100 in a sequential manner. The transmission diffusion region 2 transmits and diffuses the incident excitation light L1, while the wavelength conversion region 3 converts the wavelength of the incident excitation light L1 into a laser-receiving light L2. This not only allows at least one laser-receiving light L2 to be obtained from the excitation light L1, but also further reduces the coherence of the transmitted excitation light L1 through diffusion, which helps to reduce speckle in the projected image of the optomechanic using the phosphor wheel 100. When the excitation light L1 includes two beams of light with different wavelengths, two transmission diffusion regions 2 and one wavelength conversion region 3 can be provided. The two transmission diffusion regions 2 respectively transmit and diffuse the two beams of light with different wavelengths, and the wavelength conversion region 3 converts one of the excitation light beams L1 into a laser-receiving light L2, thereby obtaining three primary color lights of different wavelengths, which helps to reduce the cost of the optomechanic using the phosphor wheel 100.
[0094] In some embodiments, see Figure 1The transmission diffusion region 2 includes two adjacent transmission diffusion regions 2 and a wavelength conversion region 3. Both transmission diffusion regions 2 are fan-shaped and are respectively a first transmission diffusion region 21 and a second transmission diffusion region 22. The first transmission diffusion region 21 and the second transmission diffusion region 22 can transmit and diffuse the excitation light L1 with different wavelengths, respectively.
[0095] The first transmission diffusion region 21 is configured to transmit and diffuse 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 region 21 can be any value within the range of 405nm-430nm, 430nm-450nm, or 450nm-475nm. The second transmission diffusion region 22 is configured to transmit and diffuse 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 region 22 can be any value within the range of 635nm-640nm, 640nm-645nm, or 645nm-651nm. By setting two transmission diffusion regions 2 to transmit and diffuse the incident excitation light L1 with different wavelengths respectively, 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 optomechanism using the phosphor wheel 100; and by setting the first transmission diffusion region 21 and the second transmission diffusion region 22 to transmit and diffuse the incident excitation light L1 with different wavelengths respectively, it is beneficial to further solve the problem of heat accumulation caused by multiple excitation light L1 with different wavelengths incident at the same position of the phosphor wheel 100.
[0096] Optionally, the fluorescent wheel 100 may also include one, three or more transmission diffusion regions 2; and / or, the fluorescent wheel 100 may also include two, three or more wavelength conversion regions 3, which are not limited in this application.
[0097] Please refer to the following: 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 phosphor wheel 100. The first transmission layer 11 is used to transmit the incident excitation light L1. 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 this application does not limit it.
[0098] The diffuse layer 23 is used to diffuse the incident excitation light L1. The diffuse layer 23 is disposed on one side or opposite sides of the first transmission layer 11. For example, the diffuse layer 23 can be coated on a local area of one side surface of the first transmission layer 11 to form a transmission diffusion region 2.
[0099] In some embodiments, please refer to the following: Figure 1 and Figure 3 The diffuse layer 23 includes a first diffuse sublayer 231 and a second diffuse sublayer 232. The first diffuse sublayer 231, the first transmission layer 11, and the second diffuse sublayer 232 are stacked along the axial direction of the phosphor wheel 100. The first diffuse sublayer 231 and the second diffuse sublayer 232 are used to diffuse the incident excitation light L1.
[0100] By setting up the transmission diffusion region 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 region 2, thus achieving the effect of transmitting and diffusing the excitation light L1.
[0101] In some embodiments, please refer to the following: Figure 1 and Figure 3 The transmission diffusion region 2 has a first incident light surface 2a and a first exit light surface 2b; optionally, the first incident light surface 2a and the first exit light surface 2b are formed with a rough structure (not shown); or either the first incident light surface 2a and the first exit light surface 2b are formed with a rough structure to achieve the effect of diffusion transmission of excitation light L1, which is not limited in this application.
[0102] Furthermore, rough structures (not shown in the figure) are structures that make the surface uneven, such as raised structures, textured structures, or hammered structures.
[0103] See Figure 1 The wavelength conversion region 3 can also be fan-shaped. 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 incident excitation light L1, and the wavelength conversion layer 33 is used to convert the wavelength of the incident excitation light L1 before it is emitted.
[0105] In some embodiments, the wavelength conversion region 3 further includes two antireflection layers 31 and a reflective layer 32. The two antireflection layers 31 are respectively attached to opposite side 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 antireflection layer 31 and the wavelength conversion layer 33, and connects the antireflection layer 31 and the wavelength conversion layer 33. The antireflection layer 31, the reflective layer 32, and the wavelength conversion layer 33 are stacked.
[0106] The antireflection 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 is incident on 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 a laser light L2 with a different wavelength before transmitting it to the laser light L2.
[0107] The wavelength conversion layer 33 in the wavelength conversion region 3 includes a second light-emitting surface 331 for emitting the received laser L2. The reflective layer 32 is configured to reflect a portion of the received laser L2 emitted from the wavelength conversion layer 33, so that the received laser L2 is emitted in a direction away from the first transmission layer 11, even if the received laser L2 is emitted from the second light-emitting surface 331.
[0108] Please refer to the following: Figure 2 and Figure 4 In some embodiments, the phosphor 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 cycles of the laser L2 emitted from the different wavelength conversion regions 3 are different. For example, the phosphor 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 wavelength conversion layer 33 of one wavelength conversion region 3 is made of green phosphor material, and the wavelength conversion layer 33 of the other wavelength conversion region 3 is made of purple phosphor material. The area of the second light-emitting surface 331 of the wavelength conversion region 3 of the green phosphor material is larger than that of the second light-emitting surface 331 of the wavelength conversion region 3 of the purple phosphor material. As a result, when the excitation light L1 is incident on the two wavelength conversion regions 3 at a uniform speed in sequence, the duration of the excitation light L1 irradiation in the wavelength conversion region 3 of the green phosphor material is different from the duration of the irradiation in the wavelength conversion region 3 of the purple phosphor material. This results in different duty cycles for the received laser L2 emitted from different wavelength conversion regions 3, that is, the duty cycles of the green received laser L2 and the purple received laser L2 are different.
[0109] In some embodiments, the wavelength conversion layer 33 is made of phosphor or fluorescent ceramic material. For example, the wavelength conversion layer 33 can be made of yellow yttrium aluminum garnet doped with trivalent cerium. The wavelength conversion layer 33 can also be made of oxide ceramic material, nitride ceramic material, or oxynitride ceramic material, and this application does not impose any limitations. For example, when the wavelength conversion layer 33 is made of green phosphor, the excitation light L1 is blue light. The wavelength conversion layer 33 is used to convert the blue excitation light L1 into green received laser light L2, and transmits the green received laser light L2 through the second light-emitting surface 331.
[0110] Please refer to this again. 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 received laser L2 and is disposed on the side of the wavelength conversion region 3 where the second light-emitting surface 331 is located. The color filter element 4 is used to receive and filter the received laser L2, that is, to reduce the spectral width of the received laser L2 transmitted from the second light-emitting surface 331. By providing the color filter element 4, it is beneficial to reduce the vividness of the color of the received laser L2 emitted from the wavelength conversion region 3, thereby reducing the stimulation of the received laser L2 on the human eye, increasing the visual saturation when the human eye views the image generated by the received laser L2, and thus improving the user experience.
[0111] Please refer to this again. 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, which are disposed opposite to each other and spaced apart. A wavelength conversion layer 33 is sandwiched between the two second transmission layers 12. Two antireflection layers 31 are directly attached to the opposite side surfaces of one of the second transmission layers 12, and one of the antireflection layers 31 is stacked with a reflective layer 32 and a wavelength conversion layer 33. The reflective layer 32 is disposed between the antireflection layer 31 and the wavelength conversion layer 33. This application does not impose any limitations.
[0112] The wavelength conversion layer 33 receives the excitation light L1 transmitted from one of the second transmission layers 12, converts the excitation light L1 into a laser light L2 with a different wavelength, and then transmits the laser light L2. Another second transmission layer 12 transmits the laser 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 vividness of the color of the laser light L2 emitted from the wavelength conversion region 3.
[0113] Please refer to the following: Figure 6 and Figure 7 In some embodiments, the fluorescent wheel 100 can translate along at least one direction to translate the transmission diffusion region 2 and the wavelength conversion region 3; and / or the fluorescent wheel 100 can rotate to rotate the transmission diffusion region 2 and the wavelength conversion region 3. By making the fluorescent wheel 100 movable to drive the two transmission diffusion regions 2 and one wavelength conversion region 3 to translate and / or rotate, when the emission direction of the excitation light L1 remains unchanged, it is beneficial to allow the excitation light L1 to be incident sequentially onto the two transmission diffusion regions 2 and one wavelength conversion region 3 on the first transmission layer 11.
[0114] Specifically, for example, the phosphor wheel 100, driven by a driver (not shown), can rotate around the axis of the center of the first transmission layer 11 to drive the two transmission diffusion regions 2 and the wavelength conversion region 3 to rotate, thereby causing the excitation light to be incident sequentially on the two transmission diffusion regions 2 and the wavelength conversion region 3. In some embodiments, when the two transmission diffusion regions 2 and the wavelength conversion region 3 are fan-shaped, the phosphor wheel 100 can translate along at least one direction perpendicular to its own optical axis so that the excitation light L1 can be incident on the two transmission diffusion regions 2 and the wavelength conversion region 3 located at different positions.
[0115] Example 2
[0116] Please refer to the following: Figure 8 , Figure 9 and Figure 10 The fluorescent wheel 200 provided in Embodiment 2 of this application differs from the fluorescent wheel 100 in Embodiment 1 in that: the second transmission layer 12 and the wavelength conversion layer 33 are arranged adjacent to each other 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 the incident part of the excitation light L1 into a laser L2 with a different wavelength and then transmits the laser L2, so that the excitation light L1 and the laser L2 are emitted from the wavelength conversion region 3.
[0117] The fluorescent wheel 200 of Embodiment 2 of this application sets the wavelength conversion region 3 to transmit a portion of the excitation light L1, and converts the incident excitation light L1 into a received laser L2 with a different wavelength before transmitting the received laser L2. This allows the excitation light L1 and the received laser L2 to exit from the wavelength conversion region 3. Not only can at least one received laser L2 be obtained through the excitation light L1, but also multiple colors of light can be emitted by mixing the transmitted excitation light L1 and the converted received laser L2. This allows for the acquisition of multicolor light with different wavelengths, which helps to reduce the cost of the optical engine using the fluorescent wheel 200.
[0118] In some embodiments, the second transmission layer 12 and the wavelength conversion layer 33 are arranged adjacent to each other in the radial direction of the phosphor wheel 100, that is, the second transmission layer 12 is concentrically nested around the wavelength conversion layer 33. Optionally, the wavelength conversion layer 33 is concentrically nested around the second transmission layer 12. This application does not impose any limitations.
[0119] In some embodiments, the wavelength conversion region 3 further includes two antireflection layers 31 and a reflective layer 32. The two antireflection layers 31 are respectively attached to opposite side surfaces of the second transmission layer 12. A wavelength conversion layer 33 is disposed on one side of the second transmission layer 12; the reflective layer 32 is disposed between the antireflection layer 31 and the wavelength conversion layer 33, and connects the antireflection layer 31 and the wavelength conversion layer 33. The antireflection 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. The wavelength conversion layer 33 is used to convert part of the incident blue excitation light L1 into green received laser L2 and transmit the green received laser L2. The second transmission layer 12 transmits part of the blue excitation light L1, so that the blue excitation light L1 and the green received laser L2 are emitted from the wavelength conversion region 3.
[0121] Please see Figure 11 In some embodiments, the second transmission layer 12 is a perforated layer 353 formed in the phosphor wheel 200. The perforated layer 353 allows a portion of the incident excitation light L1 to pass through, so that the excitation light L1 and the received laser L2 exit from the wavelength conversion region 3. Optionally, the perforated layer 353 and the wavelength conversion layer 33 are arranged adjacent to each other, or the perforated layer 353 and the wavelength conversion layer 33 are arranged concentrically nested, which is not limited in this application. By providing the perforated layer 353, it is beneficial to reduce the volume of the phosphor wheel while allowing a portion of the excitation light L1 to pass through and the received laser L2 with a different wavelength to exit, thereby further reducing the volume of the optomechanical system using the phosphor wheel 200.
[0122] Furthermore, the cutout layer 353 is a cutout notch on the fluorescent wheel, which can prevent the excitation light L1 from being lost when passing through the cutout layer 353.
[0123] Example 3
[0124] Please refer to the following: Figure 1 and Figure 12 The optomechanical system 600 provided in Embodiment 3 of this application includes a light source module 61 and a phosphor wheel 100 (or 200) as described in any of the above embodiments. The light source module 61 is used to emit excitation light L1. The phosphor wheel 100 (or 200) is movably disposed in the optical path of the excitation light L1 so that the excitation light L1 can be incident sequentially onto the transmission diffusion region 2 and wavelength conversion region 3 located at different positions on the phosphor wheel 100 (or 200). The transmission diffusion region 2 of the phosphor wheel 100 (or 200) is used to transmit and diffuse the incident excitation light L1; the wavelength conversion region 3 is used to receive the incident excitation light L1, and the wavelength conversion region 3 is also used to convert the incident excitation light L1 into a laser beam L2 with a different wavelength and then transmit the laser beam L2.
[0125] In some embodiments, the excitation light L1 includes at least two types of light with different wavelengths (e.g., the excitation light L1 includes a first excitation light L11 and a second excitation light L12). The phosphor wheel 100 (or 200) includes two transmission diffusion regions 2 and a wavelength conversion region 3. The two transmission diffusion regions 2 are a first transmission diffusion region 21 and a second transmission diffusion region 22, respectively. 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 optomechanism 600 of this embodiment can not only obtain laser light L2 through excitation light L1, but also further reduce the coherence of the transmitted excitation light L1 through diffusion, which is beneficial to reduce the speckle of the projected image of the optomechanism 600. The excitation light L1 includes a first excitation light L11 and a second excitation light L12. By setting two transmission diffusion regions 2 and a wavelength conversion region 3, the two transmission diffusion regions 2 transmit and diffuse the first excitation light L11 and the second excitation light L12 respectively, and the wavelength conversion region 3 converts the first excitation light L11 or the second excitation light L12 into laser light L2, thereby obtaining three primary color lights of different wavelengths, which is beneficial to reduce the cost of the optomechanism 600 using the phosphor wheel 100 (or 200).
[0127] In some embodiments, the optomechanical system 600 includes a light guiding module 62 disposed in the optical path of the excitation light L1, for receiving and guiding the emission of the excitation light L1. The light source module 61 includes a first laser 611 and a second laser 612 disposed on the same side. The first laser 611 emits the first excitation light L11, and the second laser 612 emits the second excitation light L12. The emission directions of the first excitation light L11 and the second excitation light L12 are the same. The first laser 611 includes multiple blue laser diodes, and the wavelength range of the first excitation light L11 is 405nm-475nm; the second laser 612 includes multiple red laser diodes, and the wavelength range of the second excitation light L12 is 635nm-651nm. By setting a first laser 611 and a second laser 612 and a phosphor wheel 100 (or 200), the phosphor 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 a laser L2. This helps to reduce the coherence of the emitted first excitation light L11 and the second excitation light L12, and helps to reduce the speckle of the displayed image of the optical engine 600. Compared with other optical engines that set speckle reduction elements, the optical engine 600 of this application embodiment helps to reduce the overall size and cost of the optical engine 600.
[0128] The light guiding module 62 includes a reflective element 621 and a light combining element 622. The reflective element 621 is disposed 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 disposed 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 further 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 phosphor wheel 100 (or 200).
[0130] Please refer to the following: Figure 1 and Figure 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 includes only a light combining element 622, a focusing element 623, and a plane mirror 624. The light combining element 622 is disposed 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 phosphor wheel 100 (or 200).
[0131] In some embodiments, the excitation light L1 further includes a third excitation light (not shown), and the light source module 1 further includes a third laser (not shown) for emitting the third excitation light; the wavelength conversion region 3 is capable of transmitting a portion of the third excitation light and is capable of converting another portion of the third excitation light wavelength to the wavelength of the laser 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 region 3 of the phosphor wheel 100 (or 200) includes a yellow fluorescent material, part of the third excitation light incident on the wavelength conversion region 3 is transmitted, and another part of the third excitation light incident on the wavelength conversion region 3 is converted into a yellow received laser L2 and then transmitted out, so that the blue third excitation light and the yellow received laser L2 are emitted from the wavelength conversion region 3, and the red second excitation light L12 and the green first excitation light L11 are transmitted and diffused from the first transmission diffusion region 21 and the second transmission diffusion region 22, respectively. Thus, blue, yellow, red and green light can be obtained within one rotation cycle of the phosphor wheel 100 (or 200), and white light can be obtained. Multiple colors of light can be obtained. At the same time, the coherence of the transmitted excitation light L1 can be further reduced by diffusion, which is beneficial to reducing the cost of the optomechanical system using the phosphor wheel 100 (or 200).
[0133] In some embodiments, the optomechanical system 600 further includes a drive module 5, which drives the phosphor wheel 100 (or 200) to rotate relative to the light guiding module 62 around the central axis of the phosphor wheel 100 (or 200) so as to rotate the two transmission diffusion regions 2 and the wavelength conversion region 3 so that the excitation light L1 is incident on the transmission diffusion region 2 and the wavelength conversion region 3 located at different positions.
[0134] In some embodiments, the optomechanical system 600 further includes a control module 63, which controls the duration of the excitation light L1 incident on the transmission diffusion region 2 and the wavelength conversion region 3 located at different positions. Specifically, the control module 63 controls the duration of laser L2 emission by controlling the duration of the first excitation light L11 and / or the second excitation light L12 incident on the wavelength conversion region 3; controls the duration of the first excitation light L11 transmission and diffusion by controlling the duration of the first excitation light L11 incident on the first transmission diffusion region 21; and controls the duration of the second excitation light L12 transmission and diffusion by controlling the duration of the second excitation light L12 incident on the second transmission diffusion region 22. For example, within one rotation / translation cycle of the phosphor wheel 100 (or 200), when the phosphor wheel 100 (or 200)... When the first transmission diffusion region 21 is located in 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 region 22 of the phosphor wheel 100 (or 200) is located in 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 region 3 of the phosphor wheel 100 (or 200) is located in 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, so as to convert the incident excitation light L1 into a laser L2 with a different wavelength and then transmit the laser L2.
[0135] In some embodiments, the optomechanical system 600 further includes a light-collecting module 64 disposed on the light-emitting side of the phosphor wheel 100 (or 200). The light-collecting module 64 is used to receive the laser light L2 and / or excitation light L1 emitted from the phosphor wheel 100 (or 200).
[0136] Example 4
[0137] Please refer to the following: Figure 1 , Figure 12 and Figure 14 The projection device 900 provided in Embodiment 4 of this application includes the optical engine 600 as described in any of the above embodiments. The projection device 900 can be an electronic device with projection function, such as a projector or a projector unit. The control module 63 of the optical engine 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 this application embodiment, by setting the optical engine 600 as in any of the above embodiments, can not only obtain the laser L2 through the excitation light L1, but also further reduce the coherence of the transmitted excitation light L1 through diffusion, which is beneficial to reduce the speckle of the projected image of the projection device 900; and when the excitation light L1 includes at least two kinds of light with different wavelengths, by setting two transmission diffusion regions 2 and one wavelength conversion region 3, the two transmission diffusion regions 2 respectively transmit and diffuse the two kinds of excitation light L1 with different wavelengths, and the wavelength conversion region 3 converts one of the excitation light L1 with one wavelength into the laser L2, thereby obtaining three primary color light of different wavelengths, which is beneficial to reduce the cost of the projection device 900 using the optical engine 600.
[0139] The above description is merely an embodiment of this application and does not limit the patent scope of this application. Any equivalent structural or procedural transformations made using the content of this application's specification and drawings, or direct or indirect applications in other related technical fields, are similarly included within the patent protection scope of this application.
Claims
1. A fluorescent wheel, characterized in that, include: A transmission diffusion region for transmitting and diffusing incident excitation light, the transmission diffusion region comprising a first transmission layer and a diffuse layer stacked along the axial direction of the phosphor wheel, the first transmission layer for transmitting the incident excitation light, and the diffuse layer for diffusing the incident excitation light; and A wavelength conversion region is used to convert the wavelength of the incident excitation light into that of the laser.
2. The fluorescent wheel according to claim 1, characterized in that, The diffuse layer includes a first diffuse sublayer and a second diffuse sublayer, wherein the first diffuse sublayer, the first transmissive layer, and the second diffuse sublayer are stacked along the axial direction of the phosphor wheel; the first diffuse sublayer and the second diffuse sublayer are respectively used to diffuse the incident excitation light.
3. The fluorescent wheel according to claim 1, characterized in that, The transmission diffusion region has a first light-incident surface and a first light-exiting surface; the first light-incident surface and / or the first light-exiting surface have a rough structure.
4. The fluorescent wheel according to claim 1, characterized in that, The wavelength conversion region includes an adjacently disposed second transmission layer and a wavelength conversion layer; 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 before it is emitted.
5. The fluorescent wheel according to claim 4, characterized in that, The second transmission layer and the wavelength conversion layer are disposed adjacent to each other around the axial direction of the phosphor wheel; or, The second transmission layer and the wavelength conversion layer are nested adjacent to each other along the radial direction of the phosphor wheel.
6. The fluorescent wheel according to claim 4, characterized in that, The second transmissive layer is a hollow layer formed on the fluorescent wheel.
7. The fluorescent wheel according to any one of claims 1-6, characterized in that, The wavelength conversion region includes a second light-emitting surface, which is used to emit the received laser light; wherein: The phosphor wheel includes at least two wavelength conversion regions, and the second light-emitting surfaces of the at least two wavelength conversion regions have different area sizes; and / or, The fluorescent wheel also includes a color filter element, which is disposed on the side of the wavelength conversion region where the second light-emitting surface is disposed. The color filter element is used to receive and filter the laser light.
8. The fluorescent wheel according to any one of claims 1-6, characterized in that, The fluorescent wheel is capable of translation in at least one direction to drive the transmission diffusion region and the wavelength conversion region to translate; and / or, The fluorescent wheel can rotate to drive the transmission diffusion region and the wavelength conversion region to rotate.
9. An optical engine, characterized in that, include: The light source module is used to emit excitation light; as well as The fluorescent wheel as described in any one of claims 1-8 is movably disposed on the optical path of the excitation light, so that the excitation light can be incident sequentially onto the transmission diffusion region and the wavelength conversion region located at different positions on the fluorescent wheel.
10. The optical engine according to claim 9, 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, wherein the first laser is used to emit the first excitation light and the second laser is used to emit the second excitation light. The first excitation light and the second excitation light may have the same or different emission directions.
11. The optical engine according to claim 10, characterized in that, The optomechanism further includes an optical guiding module, which comprises a light combining element; wherein... When the first excitation light and the second excitation light are emitted in the same direction, the light guiding module further includes a reflective element disposed on the light-emitting side of the first laser, the reflective element being used to reflect the first excitation light; the light-combining element is disposed on the light-emitting side of the second laser, the light-combining element being used to combine the second excitation light and the first excitation light reflected by the reflective element and emit them onto the phosphor wheel; or... When the emission directions of the first excitation light and the second excitation light are different, the light combining element is disposed on 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 phosphor wheel.
12. The optical engine according to claim 10, characterized in that, The fluorescent wheel includes two transmission diffusion regions, which are respectively a first transmission diffusion region and a second transmission diffusion region arranged adjacent to each other; the first transmission diffusion region is used to transmit and diffuse the incident first excitation light, and the second transmission diffusion region is used to transmit and diffuse the incident second excitation light.
13. The optical engine according to claim 12, characterized in that, The excitation light also includes a third excitation light, and the light source module also 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 another portion of the third excitation light wavelength into the wavelength of the laser-exposed light.
14. A projection device, characterized in that, include: The optical engine as described in any one of claims 9-13.