Laser light source and laser projection equipment with same

Abstract

The invention provides a laser light source and laser projection equipment with the same, and the laser light source comprises a laser which can generate exciting light; the color wheel assembly comprises two groups of functional wheels, and the two groups of functional wheels are coaxially arranged and can receive the exciting light, perform spectrum modulation on the exciting light and generate multicolor light sources with different spectrums; and the driving mechanism can drive the two groups of functional wheels to coaxially, synchronously and reversely rotate. According to the invention, the two groups of functional wheels can be driven by the driving mechanism to coaxially, synchronously and reversely rotate, so that the multicolor light sources with different spectrums are generated after the spectrum modulation is carried out on the laser emitted by the laser, and the synchronous reverse rotation driving operation of the two groups of functional wheels can be realized by one driving source; the definition and uniformity of the projected image are improved, and the requirement of a user for high-quality visual experience is met.

Description

Technical Field

[0001] The present invention relates to the technical field of optical lens equipment, and in particular to a laser light source and a laser projection device having the same. Background Art

[0002] With the continuous development of technology, laser projection equipment has been widely used in home theaters, commercial displays, education and other fields due to its advantages such as high brightness, high contrast and long life. As the core component of laser projection equipment, the performance of the laser light source directly affects the overall performance of the projection equipment.

[0003] Conventional fluorescent wheels and filter wheels are mounted on separate motors, and synchronized rotation in the same direction is ensured by the synchronization signals of the two motors. This method requires high coordination between the two motors and requires multiple sensing elements and control elements to achieve. Failure of any of the multiple electronic control elements will affect the coordination consistency of the laser light source and the laser projection device, as well as the stability of the projection operation, affecting the clarity and uniformity of the projected image, and failing to meet the user's demand for a high-quality visual experience. Therefore, the development of a laser light source with better performance and a laser projection device with the same is of great practical significance. Summary of the Invention

[0004] In view of this, the present invention provides a laser light source and a laser projection device having the same, which can drive the two sets of functional wheels in the color wheel assembly to rotate coaxially and in opposite directions through a driving mechanism, without the need to set up multiple sensing electronic control elements and driving elements, thereby greatly improving the clarity and uniformity of the projected image of the projection device, making the operation more stable and efficient, and meeting the user's demand for high-quality visual experience.

[0005] To solve the above technical problems, the present invention provides a laser light source and a laser projection device having the same, comprising a laser, capable of generating excitation light;

[0006] The color wheel assembly includes two sets of function wheels, which are coaxially arranged and can receive excitation light and perform spectral modulation on the excitation light to generate multi-color light sources with different spectra;

[0007] The two groups of functional wheels in the color wheel assembly are any combination of a fluorescent wheel and a color filter wheel, a fluorescent wheel and a fluorescent wheel, or a color filter wheel and a color filter wheel.

[0008] Each functional wheel is provided with at least one fluorescent area and / or color filter area with different spectra.

[0009] The functional wheels of different combinations are all coaxially arranged and rotate in opposite directions. There are certain requirements for the initial installation angle to ensure that light sources of corresponding colors are generated or filtered out.

[0010] The functional wheel is coaxially arranged, and can receive the excitation light and be stimulated to generate a new spectrum or filter out a spectrum with higher purity, thereby generating a multi-color light source with different spectra;

[0011] The driving mechanism can drive two sets of functional wheels to rotate coaxially and synchronously in opposite directions.

[0012] The present invention can drive two sets of functional wheels to rotate coaxially and synchronously in opposite directions through a driving mechanism, so as to achieve spectral modulation of the laser emitted by the laser and generate multi-color light sources with different spectra. This solves the problem that the traditional driving method has high requirements for the coordinated cooperation of the two motors and requires the setting of multiple sensor elements and control elements. If one of the multiple electronic control elements fails, it will affect the coordinated consistency of the laser light source and the laser projection equipment and the stability of the projection operation, affecting the clarity and uniformity of the projected image, and failing to meet the user's demand for high-quality visual experience.

[0013] The driving mechanism includes a driving source and a transmission assembly. The transmission assembly distributes the power of the driving source to the two groups of functional wheels in the color wheel assembly and drives the two groups of functional wheels to rotate synchronously in opposite directions.

[0014] The transmission assembly includes at least two coaxial and stacked rotating sleeves. The multiple rotating sleeves are divided into two groups corresponding to the two groups of functional wheels. The functional wheels are arranged in a one-to-one correspondence with the rotating sleeves. Each functional wheel is arranged at one end of the rotating sleeve of the corresponding group, and a driven wheel is arranged at the other end of the rotating sleeve.

[0015] It also includes a driving wheel, and the driven wheel is connected to the driving wheel. The driving wheel drives the driven wheels of one group of rotating shaft sleeves to rotate forward, and synchronously drives the driven wheels of another group of rotating shaft sleeves to rotate backward.

[0016] It also includes a focusing device, which is arranged between the laser and the color wheel assembly, and can focus the laser and then emit it to the color wheel assembly. It also includes a laser shaping device, which is arranged on the rear side of the color wheel assembly and can collimate and shape the laser passing through the color wheel assembly.

[0017] A laser projection device includes a laser light source, and also includes an optical engine and a lens arranged in sequence along the light transmission direction and located on the rear side of a laser shaping device, wherein the optical engine can receive the multi-color light source output by the laser light source and spatially modulate it, and the lens can project the image signal modulated by the optical engine onto a target surface.

[0018] In summary, compared with the prior art, this application has at least one of the following beneficial technical effects:

[0019] 1. Simplify the drive structure and improve stability and consistency: The present invention can realize the coaxial synchronous counter-rotation drive of two sets of functional wheels by adopting a single drive source and transmission assembly, replacing the traditional method that requires two motors and complex sensor control elements. It not only greatly reduces the system's high requirements for the coordination of multiple motors and reduces failure points (such as failure of a single electronic control element), but also the coaxial counter-rotating wheels have rotational torques that cancel each other out, thereby significantly improving the coordination consistency and overall operation stability of the laser light source and laser projection equipment, ultimately ensuring the clarity and uniformity of the projected image, and meeting the user's demand for high-quality visual experience. The structural design of single drive source + mechanical transmission not only reduces the complex circuit control module, but also the modular installation of the functional wheels facilitates individual replacement.

[0020] 2. Improve heat dissipation and enhance equipment reliability: The present invention can promote the air flow around the wheel body more effectively than unidirectional rotation or asynchronous rotation by adopting the design of coaxial synchronous counter-rotation of two sets of functional wheels, thereby improving heat dissipation conditions, reducing the operating temperature of the color wheel assembly and the internal phosphor, reducing the risk of performance degradation or damage due to overheating, and enhancing the long-term operation reliability and service life of the laser projection equipment. The synchronous counter-rotation of the two sets of functional wheels can form a convection airflow to accelerate the heat dissipation on the surface of the color wheel assembly. This is because the two coaxial counter-rotating functional wheels form a more complex and strong airflow around the wheel assembly. The strong airflow makes the air flow stronger and more stable, which can more effectively wash the wheel surface and continuously remove the heat from the wheel surface. It has better heat dissipation than a single functional wheel, because only the outer surface of a single functional wheel participates in heat dissipation, and there may be dead zones in the air flow. The two coaxial counter-rotating functional wheels rotate relative to each other, allowing the air to more fully contact all parts of the wheel, including the area between the functional wheels. When rotating in opposite directions, the inner surface of the wheel also becomes an effective heat dissipation surface. This does not take into account the forced convection effect in the gap area, thereby making fuller use of the heat dissipation area, improving heat dissipation efficiency, reducing aging and attenuation of the phosphor due to local overheating, and extending the service life of the functional wheel.

[0021] 3. Efficiently generate multi-color light sources to meet display requirements: The present invention can use a variety of combination modes of color wheel components, such as a combination of fluorescent wheel-fluorescent wheel, color filter wheel-color filter wheel or fluorescent wheel-color filter wheel, and set different color areas on each functional wheel, to achieve efficient spectral modulation (excitation or color filtering) of the laser emitted by the laser, stably generate the required three primary colors or multi-color light sources, provide a high-quality light source foundation for laser display imaging, meet the color saturation and brightness requirements of different scenarios such as home theaters and commercial displays, and have stronger adaptability. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1Schematic diagram of the structure of the laser light source and the laser projection device having the same according to the present invention;

[0023] Figure 2 This is a schematic structural diagram of the laser light source, focusing device and color wheel assembly of the present invention;

[0024] Figure 3 This is a schematic diagram of the structure of the laser light source, focusing device, color wheel assembly, laser shaping device and optical machine of the present invention;

[0025] Figure 4 is a front view of the fluorescent wheel and the color filter wheel in the color wheel assembly of the present invention;

[0026] Figure 5 It is a structural schematic diagram of the fluorescent wheel and the fluorescent wheel in the color wheel assembly of the present invention;

[0027] Figure 6 Schematic diagram of the structure of the color filter wheel and the color filter wheel in the color wheel assembly of the present invention;

[0028] Figure 7 Schematic diagram of the structure of one embodiment of the driving mechanism and color wheel assembly in the present invention;

[0029] Figure 8 FIG. 1 is another embodiment of the driving mechanism and color wheel assembly of the present invention.

[0030] Explanation of the accompanying reference numerals: 100, laser; 200, color wheel assembly; 210, fluorescent wheel; 220, color filter wheel; 300, driving mechanism; 310, transmission assembly; 311, rotating sleeve; 312, driven wheel; 313, driving wheel; 400, focusing device; 500, laser shaping device; 600, optical machine; 700, lens. DETAILED DESCRIPTION

[0031] To make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the following will be combined with the appended drawings of the embodiments of the present invention. Figure 1-8 , clearly and completely describing the technical solutions of the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of them. Based on the described embodiments of the present invention, all other embodiments derived by ordinary technicians in this field fall within the scope of protection of the present invention.

[0032] like Figure 1 、 Figure 2 、 Figure 3 、 Figure 7 and Figure 8As shown: This embodiment provides a laser light source and a laser projection device having the same, including a laser 100, which can generate laser light. The laser 100 can be a single laser 100 or a combination of multiple lasers 100. The multiple lasers 100 are arranged vertically and emit laser light of at least one color. This embodiment uses a single laser 100, which can emit blue laser light to provide initial excitation light for the system.

[0033] Color wheel assembly 200, such as Figure 2 and Figure 3 As shown, the color wheel assembly 200 includes two groups of functional wheels, which are coaxially arranged and can receive excitation light and perform spectral modulation on the excitation light to generate multi-color light sources with different spectra;

[0034] Drive mechanism 300, such as Figure 6 and Figure 7 As shown, it can drive two sets of functional wheels to rotate coaxially and synchronously in opposite directions.

[0035] The present invention can drive two sets of functional wheels to rotate coaxially and synchronously in opposite directions through the driving mechanism 300, so as to achieve spectral modulation of the excitation light emitted by the laser 100 and generate multi-color light sources with different spectra. This solves the problem that the traditional driving method has high requirements for the coordinated cooperation of the two motors and requires the installation of multiple sensor elements and control elements. If one of the multiple electronic control elements fails, it will affect the coordinated consistency of the laser light source and the laser projection equipment and the stability of the projection operation, affecting the clarity and uniformity of the projected image, and failing to meet the user's demand for high-quality visual experience.

[0036] According to one embodiment of the present invention, the driving mechanism 300 includes a driving source and a transmission assembly 310, such as Figure 7 and Figure 8 As shown, the transmission component 310 distributes the power of the driving source to the two groups of functional wheels in the color wheel component 200, and drives the two groups of functional wheels to rotate synchronously in the opposite direction. The present invention can drive the transmission component 310 with the two groups of functional wheels to rotate synchronously in the opposite direction through the driving source, thereby realizing the driving operation of the synchronous reverse rotation of the two groups of functional wheels by one driving source, thereby greatly improving the coordinated and consistent performance of the movement of the two groups of functional wheels.

[0037] The transmission assembly 310 includes at least two coaxial and stacked rotating sleeves 311. The multiple rotating sleeves 311 are divided into two groups corresponding to the two sets of functional wheels. The functional wheels are arranged in a one-to-one correspondence with the rotating sleeves 311. Each functional wheel is arranged at one end of the rotating sleeve 311 of the corresponding group, and a driven wheel 312 is arranged at the other end of the rotating sleeve 311.

[0038] The driving wheel 313 is also included, and the driven wheel 312 is connected to the driving wheel 313 in a transmission manner. The driving wheel 313 drives the driven wheels 312 of one group of rotating shaft sleeves 311 to rotate in the forward direction, and synchronously drives the driven wheels 312 of another group of rotating shaft sleeves 311 to rotate in the reverse direction. The present invention can start the driving source to rotate the driving wheel 313 while driving the driven wheel 312 connected to it, the rotating sleeve on the driven wheel 312 and the functional wheel outside the rotating sleeve to perform coaxial reverse synchronous rotation operations, thereby greatly improving the rotation stability of the two groups of functional wheels.

[0039] Two implementations of the transmission assembly 310 are described in detail below:

[0040] According to another embodiment of the present invention, Figure 6 As shown, the driving mechanism 300 includes a main driving gear, a rotating shaft is provided on the axis of the main driving gear, a driving source is provided at the other end of the rotating shaft, the driving source is a motor, and the rotating shaft is drivingly connected to the output shaft of the driving source;

[0041] The gear transmission assembly 310 also includes two reverse transmission gears, which mesh with the main drive gear and are symmetrically arranged at both ends of the driving gear. A first transmission shaft is arranged on the axis of one of the reverse transmission gears, and a second transmission shaft is arranged on the axis of the other reverse transmission gear. The first transmission shaft has a through hole with a diameter larger than that of the second transmission shaft. The second transmission shaft passes through the through hole. The first transmission shaft and the second transmission shaft are coaxially arranged. One of the functional wheels in the color wheel assembly 200 is arranged on the first transmission shaft, and the other functional wheel in the color wheel assembly 200 is arranged on the second transmission shaft. The present invention can rotate the driving gear together through the rotation of the output shaft of the driving source. The driving gear can rotate the two meshed reverse transmission gears in opposite directions, thereby driving the first and second transmission shafts on the two reverse transmission gears to cause the two functional wheels to rotate synchronously on the same axis in opposite directions. The two coaxial, counter-rotating functional wheels will form a more complex and intense airflow in the surrounding air, making the air flow more powerful and stable, and can more effectively flush the surface of the functional wheel, continuously removing heat from the wheel surface.

[0042] According to another embodiment of the present invention, Figure 7As shown, the driving mechanism 300 includes a driving source, which is a motor. A gear plate is provided at the end of the output shaft of the driving source. Two driving gears with different diameters are provided on the gear plate, which are named as the driving large gear and the driving small gear respectively. Driven gears meshing with it are symmetrically provided at both ends of the driving large gear. The axis of the driven gear is perpendicular to the axis of the driving large gear. Driven gears meshing with it are symmetrically provided at both ends of the driving small gear. The rotating sleeve 311 of each driven gear, the four rotating sleeves 311 are coaxial and stacked together at one time, the rotation direction of the two adjacent rotating sleeves 311 on the same side is the same, and a functional wheel is provided at the end of each rotating sleeve 311. The present invention can drive the gear plate and the driving large gear and the driving small gear thereon to rotate synchronously in the same direction through the rotation of the cooked pork elbow of the driving source, and then drive the pre-engaged driven gear to rotate with the rotating sleeve 311 and the functional wheel at the end of the rotating sleeve 311, thereby realizing efficient and stable projection operation.

[0043] Of course, the drive mechanism 300 can also transmit power in a belt-driven pulley transmission mode. As long as the transmission structure can synchronously drive two sets of functional wheels to rotate in opposite directions, it is within the protection scope of this drive mechanism 300 and will not be elaborated on here.

[0044] The functional wheels of different combinations are all coaxially arranged and rotate in opposite directions. There are certain requirements for the initial installation angle to ensure that the corresponding color light source is generated or filtered out. The specific corresponding relationship is described in detail in the following embodiments:

[0045] According to another embodiment of the present invention, Figure 4-Figure 6 As shown, the two functional wheels in the color wheel assembly 200 are a fluorescent wheel 210 and a color filter wheel 220 (as shown in FIG. Figure 4 As shown), fluorescent wheel 210 and fluorescent wheel 210 '(as shown Figure 5 As shown), color filter wheel 220 and color filter wheel 220 '(as shown Figure 6 The present invention can utilize any combination of the three primary colors (shown in Figure 2) to provide the three-primary color light source required for laser display imaging through the color wheel assembly 200. Specifically, excitation light emitted by the excitation light source 100 illuminates the fluorescent region of the fluorescent wheel. Upon excitation, the fluorescent material within the excitation region produces fluorescence with a specific spectrum. This fluorescence is then filtered by the corresponding color filter region of the color filter wheel, ultimately producing a combination of multiple monochromatic lights with high spectral purity.

[0046] The fluorescent wheel 210 comprises at least a red light conversion zone, a green light conversion zone, and a light source transmission zone. The red light conversion zone is provided with a red light conversion material, while the green light conversion zone is provided with a green light conversion material. The light source transmission zone is not provided with a light conversion material, but may be provided with a laser diffusion material to eliminate speckle from the excitation light. Blue light emitted by the laser illuminates the fluorescent wheel 210, stimulating fluorescence of the same color as the corresponding light conversion zone (i.e., red and green fluorescence). The light source transmission zone transmits the blue light, which is then filtered by the color filter wheel 220.

[0047] According to another embodiment of the present invention, Figure 2-Figure 4 As shown, each functional wheel is provided with at least one fluorescent region and / or color filter region with different spectra, specifically:

[0048] When the function wheel is a fluorescent wheel 210, the fluorescent wheel 210 includes at least two fluorescent powder areas of different colors. Correspondingly, when the function wheel is a color filter wheel 220, the color filter wheel 220 includes at least two filter areas of different colors. The present invention can achieve excitation and color filtering of the blue light emitted by the laser emitter through the coordinated action of the fluorescent wheel 210 and / or the color filter wheel 220, thereby achieving efficient and stable imaging display.

[0049] Figure 4 The fluorescent wheel 210 in the figure is a schematic diagram of the structure of a fluorescent wheel in a laser light source provided by the present invention. The fluorescent wheel includes at least a red light conversion subzone 210b, a green light conversion subzone 210c, and a first light transmission zone 210a for emitted light. The red light conversion subzone is provided with a red light conversion material, the green light conversion subzone is provided with a green light conversion material, and the light transmission zone is provided with no light conversion material. Blue light irradiating the fluorescent wheel excites fluorescence of the same color as the corresponding light conversion subzones, namely red and green fluorescence. The light transmission zone transmits the blue light, which is then filtered by a color filter wheel.

[0050] Figure 4 The color filter wheel 220 in the laser light source is a schematic diagram of the structure of the color filter wheel provided by the present invention. The color filter wheel includes a red light filter region 220b, a green light filter region 220c, and a second transmission region 220a for emitted light. The red light filter region 220b is provided with a red filter coated with a red filter film, which only transmits red wavelengths of light and filters out light of other wavelengths. The green light filter region 220c is provided with a green filter coated with a green filter film, which only transmits green wavelengths of light and filters out light of other wavelengths. The blue light transmission region 220a transmits blue light, is not coated with a filter film, and is fully transparent.

[0051] Because the fluorescent wheel and the color filter wheel rotate synchronously in opposite directions, the zones of the fluorescent wheel and the color filter wheel must be arranged to ensure that during their counter-rotation, after being excited by the excitation light (e.g., blue light), the red fluorescent light and the green fluorescent light emitted from the fluorescent wheel 210, as well as the transmitted blue light, respectively illuminate the corresponding red filter area 220b, the blue filter area 220c, and the transmission area 220a, thereby obtaining the three primary colors of red, green, and blue light for different application functions.

[0052] However, in actual applications, in order to balance cost and basic color performance, red light is usually obtained by filtering yellow fluorescence through a color filter wheel.

[0053] The following is a detailed description of the three specific situations and working principles of the two sets of functional wheels:

[0054] Example 1

[0055] like Figure 4 As shown, when the two functional wheels are a combination of a fluorescent wheel 210 and a color filter wheel 220, the fluorescent wheel 210 includes a fluorescent area and a first transmissive area distributed along the outer circumference. The fluorescent area is used to receive laser light and emit at least one color of fluorescence, while the first transmissive area is used to transmit laser light. Specifically, to provide the three-primary color light source required for laser display imaging, the first transmissive area 210a does not contain phosphor material. The fluorescent area may include yellow phosphor 210b and green phosphor 210c. A blue laser beam sequentially illuminates the outer circumferential area, thereby sequentially exciting the corresponding fluorescent areas, generating yellow and green fluorescence, and then transmitting through the first transmissive area, as shown in FIG. Figure 4 When the laser light source is used in an illumination system, the fluorescent area of ​​the laser light source may include only yellow fluorescent powder, or only green fluorescent powder, and similarly, the first transmission area does not include fluorescent powder material.

[0056] Therefore, in another special scenario of this embodiment, when the laser light source is used to provide a monochromatic illumination light source, the fluorescent area of ​​the fluorescent wheel 210 contains only yellow fluorescent powder or only green fluorescent powder, and the color filter wheel 220 contains only red filter area or only green filter area, and the red light or green light is obtained after filtering.

[0057] It should be noted that in addition to the yellow light conversion subarea 210b, green light conversion subarea 210c, and first light transmission area 210a of the aforementioned fluorescent wheel 210, the red light filter area 220b, green light filter area 220c, and second light transmission area 220a of the color filter wheel 220, the fluorescent wheel 210 may also include other fluorescent areas. Furthermore, the color filter wheel 220 may also include other filter areas. Specifically, the number of filter areas in the color filter wheel 220 and the type of filter corresponding to each filter area can be set and adjusted based on the number of fluorescent areas in the fluorescent wheel 210, the type of fluorescent material in each fluorescent area, and actual needs, and are not limited here.

[0058] Example 2:

[0059] like Figure 5 As shown, when the two functional wheels are a combination of a fluorescent wheel 210 and a fluorescent wheel 210, they are named a first fluorescent wheel 210 and a second fluorescent wheel 210' to distinguish them. The first fluorescent wheel 210 is provided with a yellow phosphor area and a fully laser-transmitting area, and the second fluorescent wheel 210' is provided with a green phosphor area and a fully laser-transmitting area. The phosphor areas on the first and second fluorescent wheels 210, 210' are both oriented in the direction of laser emission. When viewed in the direction of excitation light emission, the yellow phosphor areas on the first and second fluorescent wheels 210 and 210' do not overlap. The sum of the angles of the phosphor areas on the first and second fluorescent wheels 210, 210, is less than 360 degrees.

[0060] The phosphor areas on the first phosphor wheel 210 and the second phosphor wheel 210' are arranged as follows: Figure 5 As shown, the first fluorescent wheel 210 is provided with a first laser fully transparent area 210a, a second laser fully transparent area 210c, and a yellow phosphor area 210b; the second fluorescent wheel 210' is provided with a third laser fully transparent area 210'a, a fourth laser fully transparent area 210'b, and a green phosphor area 210'c.

[0061] The working principle, working process and light path of the device are described in detail below through specific embodiments.

[0062] like Figure 5 As shown, the first fluorescent wheel 210 and the second fluorescent wheel 210' are each divided into three areas, and the arcs corresponding to the first laser fully transparent area 210a and the third laser fully transparent area 210'a, the second laser fully transparent area 210c and the green phosphor area 210'c, and the yellow phosphor area 210b and the fourth laser fully transparent area 210'b are equal. The first laser fully transparent area, the second laser fully transparent area, the third laser fully transparent area and the fourth laser fully transparent area are all made of glass and coated with a blue light high transmittance film, and the yellow phosphor area and the green phosphor area are both coated with corresponding phosphor coatings.

[0063] During one rotation of the coaxial counter-rotating fluorescent wheel 210 (first fluorescent wheel 210 rotates clockwise, second fluorescent wheel 210' rotates counterclockwise), when blue light strikes the first and third laser-transmitting areas, the blue light is fully transmitted. When blue light strikes the yellow phosphor area and the fourth laser-transmitting area, the blue light enters the yellow phosphor area, emitting yellow light. When blue light strikes the second laser-transmitting area and the green phosphor area, the blue light passes through the second laser-transmitting area of ​​the fluorescent wheel 210 and enters the green phosphor area of ​​the fluorescent wheel 210', emitting green light. Within one cycle, blue, yellow, and green light are emitted, respectively.

[0064] Example 3:

[0065] like Figure 6 As shown, when the two sets of function wheels are a combination of a color filter wheel 220 and a color filter wheel 220', in order to distinguish them, they are named as a first color filter wheel 220 and a second color filter wheel 220'. The phosphor areas on the first color filter wheel 220 and the second color filter wheel 220' are arranged as follows: Figure 6 As shown, the first color filter wheel 220 is provided with a first laser fully transparent area 220a, a second laser fully transparent area 220c, and a red filter area 220b; the second color filter wheel 220' is provided with a third laser fully transparent area 220'a, a green filter area 220'c, and a fourth laser fully transparent area 220'b. The distribution of the filter areas of the filter wheel 220 in this third embodiment corresponds to the fluorescence partitioning of the fluorescence wheel 210 in the second embodiment. In actual applications, the distribution of the filter areas of the color filter wheel can be adjusted according to the distribution of the fluorescence areas of the fluorescence wheel.

[0066] The working principle, working process and light path of the device are described in detail below through specific embodiments.

[0067] like Figure 6 As shown, the first color filter wheel 220 and the second color filter wheel 220' are divided into three areas, and the arcs corresponding to the first laser fully transparent area 220a and the third laser fully transparent area 220'a, the second laser fully transparent area 220c and the green filter area 220'c, and the red filter area 220b and the fourth laser fully transparent area 220'b are equal, and the initial installation positions correspond one-to-one to the areas described above. The first laser fully transparent area, the second laser fully transparent area, the third laser fully transparent area and the fourth laser fully transparent area are all made of glass and are coated with a blue light high transmittance film.

[0068] During one rotation of the coaxial counter-rotating color filter wheel 220 (first color filter wheel 220 rotates clockwise, second color filter wheel 220' rotates counterclockwise), when blue light strikes the first and third laser-transmitting regions 220a and 220'a, all blue light is transmitted. When yellow fluorescence strikes the red and fourth laser-transmitting regions 220a and 220'b, a relatively high-purity red light is produced. When green fluorescence strikes the second and green laser-transmitting regions 220c and 220'c, a relatively high-purity green light is produced. Within a single cycle, relatively high-purity blue, red, and green light are generated.

[0069] The fourth embodiment is a combination of the second embodiment and the third embodiment, which requires two sets of fluorescent wheels 210 and color filter wheels 220 .

[0070] In the above three embodiments, the most common combination of the color wheel assembly 200 is a fluorescent wheel 210 and a color filter wheel 220, and most people choose this combination. The purpose is to enhance the brightness and color of the pure light after filtering. The combination of the color filter wheel and the color filter wheel is only selected when a monochromatic light source needs to be filtered and enhanced at least twice. This situation has fewer application scenarios, but this combination is also within the scope of protection of the present invention.

[0071] According to another embodiment of the present invention, Figure 1 and Figure 3 , further comprising a focusing device 400, which is disposed between the laser 100 and the color wheel assembly 200 and can focus the laser light and then emit it to the color wheel assembly 200, and further comprising a laser shaping device 500, which is disposed on the rear side of the color wheel assembly 200 and can collimate and shape the laser light passing through the color wheel assembly 200, and collimate and shape the modulated light beam. The present invention can use the focusing device 400 to achieve the goal of collimating the laser light emitted by the laser 100 and then emitting it onto the periodically rotating color wheel assembly 200, thereby achieving stable imaging operation through the excitation and / or color filtering effect of the color wheel assembly 200.

[0072] According to another embodiment of the present invention, Figure 3As shown, a laser projection device includes a laser light source, and also includes an optical engine 600 and a lens 700 arranged in sequence along the optical transmission direction and located on the rear side of the laser shaping device 500. The optical engine 600 can receive the multi-color light output by the laser light source and spatially modulate it. The lens 700 can project the image signal modulated by the optical engine 600 onto a target surface. The light valve in the optical engine 600 that modulates the light source can use any one of DLP, LCD, LCOS and other technologies to spatially modulate the multi-color light source. The lens 700 can use one of ultra-short-throw, short-throw, long-throw, or zoom projection lenses to project the modulated image signal onto the target surface. The present invention can modulate the light through the light valve in the optical engine 600 and allow the modulated light to form an image through the lens 700. The lens 700 can project the image onto the projection screen at an appropriate focal length, thereby realizing projection display of the image on the projection screen, greatly improving the efficiency and quality of imaging.

[0073] Specifically, the laser 100 emits a laser that is incident on the focusing optical device. After being narrowed by the focusing optical device, the laser is emitted onto two sets of periodically rotating functional wheels that rotate synchronously and counter-rotating. The functional wheels excite and filter the narrowed blue light emitted by the laser emitter, modulate it through the optical machine 600, and then pass through components such as the lens 700 to achieve imaging, and finally project the image onto a screen or other projection surface, thereby completing the display of the image.

[0074] Working principle of the present invention:

[0075] First, it should be made clear that the laser light source and laser projection device involved in the present invention are mainly used for display and projection needs in different scenarios such as home theaters and commercial displays. The present invention uses the use of laser light source and laser projection device as an example to explain their use in detail. When projection work is required, the working principle and use method are as follows:

[0076] How it works

[0077] Laser modulation principle: Laser light emitted by laser 100 is focused by focusing device 400 and precisely incident on the functional wheels of color wheel assembly 200. A driving source drives the active wheel 313, which, through transmission assembly 310, causes two sets of rotating sleeves 311 to rotate in forward and reverse directions, respectively. This in turn drives the two sets of functional wheels to rotate coaxially and synchronously in opposite directions. When the laser light strikes the fluorescent wheel 210, it excites the phosphor to produce light of a specific color. When it strikes the color filter wheel 220, the filter area filters out light of a specific wavelength. During rotation, the laser light alternates and outputs a stable multi-color light source, which is then optimized by the laser shaping device 500 to produce a high-quality beam.

[0078] Projection Imaging Principle: Multi-color light from a laser source enters the optical engine 600. A light valve modulates the light beam at high speed based on the image signal, forming an optical signal that carries the image information. The lens 700 zooms and focuses the optical signal, ultimately projecting a clear image onto the screen.

[0079] The present invention can more effectively promote air flow around the wheel body and improve heat dissipation conditions by adopting a coaxial, synchronous, counter-rotating design for the two sets of functional wheels, compared to unidirectional or asynchronous rotation. This not only reduces the operating temperature of the color wheel assembly 200 and the phosphor inside, reducing the risk of performance degradation or damage due to overheating, but also enhances the long-term operational reliability and service life of the laser projection device. The synchronous counter-rotating design of the two sets of functional wheels can form a convection airflow to accelerate heat dissipation from the surface of the color wheel assembly 200, greatly improving heat dissipation efficiency compared to traditional unidirectional rotation structures. This reduces aging and degradation of the phosphor due to local overheating, thereby extending the service life of the functional wheels.

[0080] Furthermore, it should be noted that, in the description of the present invention, unless otherwise expressly specified or limited, the terms "mounted," "connected," and "connected" should be understood in a broad sense. For example, they may refer to fixed connections, detachable connections, or integral connections; mechanical connections or electrical connections; direct connections or indirect connections through an intermediate medium; and internal communication between two components. Those skilled in the art will understand the specific meanings of the above terms in the present invention based on specific circumstances.

[0081] The above is a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principles of the present invention. These improvements and modifications should also be regarded as within the scope of protection of the present invention.

Claims

1. A laser light source, characterized in that: It includes a laser (100) capable of generating excitation light; A color wheel assembly (200), comprising two groups of functional wheels, the two groups of functional wheels being coaxially arranged and capable of receiving excitation light and spectrally modulating the excitation light to generate multi-color light sources with different spectra; The driving mechanism (300) can drive the two groups of functional wheels to rotate coaxially and synchronously in opposite directions.

2. The laser light source according to claim 1, wherein: The driving mechanism (300) comprises a driving source and a transmission assembly (310), wherein the transmission assembly (310) distributes the power of the driving source to the two groups of functional wheels in the color wheel assembly (200) and drives the two groups of functional wheels to rotate synchronously in opposite directions.

3. The laser light source according to claim 2, wherein: The transmission assembly (310) includes at least two coaxial and stacked rotating sleeves (311), and the plurality of rotating sleeves (311) are divided into two groups corresponding to the two groups of functional wheels. The functional wheels are arranged in a one-to-one correspondence with the rotating sleeves (311), and each functional wheel is arranged at one end of the rotating sleeve (311) of the corresponding group, and a driven wheel (312) is arranged at the other end of the rotating sleeve (311); The invention also includes a driving wheel (313), and the driven wheel (312) is connected to the driving wheel (313) in a transmission manner. The driving wheel (313) drives the driven wheels (312) of one group of rotating shaft sleeves (311) to rotate in the forward direction, and synchronously drives the driven wheels (312) of the other group of rotating shaft sleeves (311) to rotate in the reverse direction.

4. The laser light source according to claim 1, wherein: The two groups of functional wheels in the color wheel assembly (200) are any combination of a fluorescent wheel (210) and a color filter wheel (220), a fluorescent wheel (210) and a fluorescent wheel (210), or a color filter wheel (220) and a color filter wheel (220).

5. The laser light source according to claim 4, wherein: Each functional wheel is provided with at least one fluorescent area and / or color filter area with different spectra.

6. The laser light source according to claim 4, when used for projection display, is characterized in that: When the function wheel is a fluorescent wheel (210), the fluorescent wheel (210) includes at least two fluorescent powder areas of different colors. Correspondingly, when the function wheel is a color filter wheel (220), the color filter wheel (220) includes at least two color filter areas of different colors.

7. The laser light source according to claim 5, wherein: When one of the two groups of function wheels is a fluorescent wheel (210) and the other group of function wheels is a color filter wheel (220), the fluorescent powder area on the fluorescent wheel (210) and the color filter area on the color filter wheel (220) must be located in the light path at the same time; when both groups of function wheels are fluorescent wheels (210), it is necessary to avoid that the different color fluorescent areas of the two groups of function wheels are located in the light path at the same time; when both groups of function wheels are color filter wheels (220), it is necessary to avoid that the different color filter areas of the two groups of function wheels are located in the light path at the same time.

8. The laser light source according to claim 1, wherein: The invention also includes a focusing device (400) arranged between the laser (100) and the color wheel assembly (200), capable of focusing the laser light and then emitting it to the color wheel assembly (200), and a laser shaping device (500) arranged at the rear side of the color wheel assembly (200), capable of collimating and shaping the laser light passing through the color wheel assembly (200).

9. A laser projection device, characterized in that: The laser light source comprises the laser light source according to any one of claims 1 to 8, and further comprises an optical machine (600) and a lens (700) arranged in sequence along the transmission direction of the optical path and located on the rear side of the laser shaping device (500), wherein the optical machine (600) is capable of spatially modulating the multi-color light source output by the received laser light source, and the lens (700) is capable of projecting the image signal modulated by the optical machine (600) onto a target surface.

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