Laser reflective unit

Abstract

A laser reflecting unit is disclosed. The laser reflecting unit includes a housing and a wheel. The housing has a top portion and a bottom portion mechanically secured to the top portion. The top portion and the bottom portion are respectively provided with fixed blades. And the fixed blades are spirally arranged. The wheel is disposed within the housing and has cooling fins. The cooling fins and the fixed blades have the same central axis.

Description

Technical Field

[0001] This disclosure relates to a laser reflecting unit, and more particularly to a laser reflecting unit having a housing and fixed blades arranged within the housing. Background Technology

[0002] A laser phosphor projector includes a laser reflecting unit that converts high-intensity laser light into colored light for use in illumination optics. During this conversion, some energy is lost and converted into heat absorbed by a phosphor layer applied directly to the wheel of the laser reflecting unit. This heat is transferred to the wheel, causing the temperature to rise. To maintain a safe temperature within the wheel, the heat needs to be distributed at a lower intensity to the cooler surrounding environment.

[0003] In conventional designs, cool air is blown directly onto the phosphor wheel by a fan inside the unit, creating a circulation toward the heated phosphor wheel and pushing the air toward the cooling surfaces inside the unit. Hot air needs to be guided within the unit to be cooled via a heat exchanger made with heat pipe technology or a large air-cooled area in contact with the surrounding cooler regions. Traditional designs are typically large, bulky, and complex.

[0004] Therefore, there is a need for improvement in this field. Summary of the Invention

[0005] This disclosure provides a laser reflecting unit and a method of operating the same. The laser reflecting unit includes a housing and a wheel. The housing has a top and a bottom mechanically fastened to the top. The top and bottom respectively have fixed blades. The fixed blades are arranged in a helical pattern. The wheel is arranged within the housing and has cooling fins. The cooling fins and the fixed blades have the same central axis.

[0006] Accordingly, this disclosure provides a laser reflection unit for a laser phosphor projector, the laser reflection unit comprising a housing having a top and a bottom mechanically fastened to the top, the top and bottom correspondingly having fixed blades disposed on the inner sidewalls of the housing, the fixed blades being arranged spirally around the central axis of the laser reflection unit; the housing further having sidewalls extending from the top to the bottom, and wheels disposed within the housing and having a top side and a bottom side opposite to the top side, the top side having a phosphor layer arranged in a ring for converting the incident laser beam into a reflected beam, the bottom... The wheel is rotatably received on the top of the housing such that the cooling fins are arranged to be surrounded by fixed blades at the top and configured to rotate about a central axis. The fixed blades at the top are configured to receive airflow generated by the cooling fins of the wheel from the same plane when the wheel rotates, and to spirally guide the airflow outward toward the sidewall of the housing, then downward along the sidewall toward the fixed blades at the bottom. The fixed blades at the bottom are configured to spirally guide the airflow inward toward the center at the bottom, and upward through the center to the cooling fins of the wheel, so that the airflow cools the phosphor layer.

[0007] The fixed blades within the outer casing are arranged in a spiral around the central axis, thus creating a spiral path for the airflow generated by the cooling fins of the wheel. This spiral motion of the airflow helps to evenly distribute the cooling effect around the annular phosphor layer on the top side of the wheel.

[0008] In some embodiments, the number of fixed blades at the bottom of the housing is a multiple of the number of fixed blades at the top of the housing.

[0009] In some embodiments, the helical direction of the fixed blades at the bottom of the housing is opposite to the helical direction of the fixed blades at the top of the housing.

[0010] In some embodiments, the channels between the fixed blades are formed with the same width.

[0011] In some embodiments, the channels formed by at least one fixed blade at the top have the same width.

[0012] In some embodiments, the bottom further includes a base and an outer edge surrounding the base. The top further includes a cover and an outer edge surrounding the cover. Furthermore, a fixing blade at the top is fixed to the cover and the outer edge at the top, and a fixing blade at the bottom is fixed to the base and the outer edge at the bottom.

[0013] In some embodiments, the laser reflective unit further includes a fluid port located between a base and a cover at the bottom to form a compartment for receiving coolant. A protrusion is formed on the outer surface of the base to distribute the coolant across the outer surface and increase the heat exchange surface between the base and the coolant within the compartment.

[0014] In some embodiments, the laser reflective unit further includes a seal formed to fill the space between the outer surface of the base and the cover.

[0015] In some embodiments, the cover and outer edge form curved surfaces configured to guide airflow from the top to the bottom of the housing.

[0016] In some embodiments, the cooling fins have a backward-curved arrangement, a forward-curved arrangement, or a radial arrangement.

[0017] In some embodiments, a perforation is formed on the top side to allow airflow toward the top side of the wheel. Furthermore, the motor is configured to drive the wheel to rotate.

[0018] In some embodiments, pins are formed on the fixed blade.

[0019] In some embodiments, the top and bottom fixed blades are arranged such that the fixed blades maintain the same arrangement when the radial alignment between the top and bottom changes at an angle.

[0020] In some embodiments, the angle is determined based on the greatest common divisor (GCD) between the number of fixed blades at the top and the number of fixed blades at the bottom.

[0021] In some embodiments, the cooling fins are configured to regulate the pressure and speed of the air circulating within the laser reflecting unit.

[0022] In some embodiments, the top has a compartment in its central portion surrounded by fixed blades on the top for receiving a wheel. The diameter of the wheel is smaller than the diameter of the compartment in the top.

[0023] Therefore, another aspect of this disclosure provides a laser reflecting unit for a laser phosphor projector, the laser reflecting unit comprising a housing having a top and a bottom mechanically fastened to the top, the top and bottom respectively having fixed blades forming a helical channel; and a wheel disposed within the housing and configured to generate airflow in a direction tangential to the circumference of the wheel. The wheel has a phosphor layer arranged annularly on the top side of the wheel. The fixed blades at the top form a compartment to receive the wheel. The airflow generated by the wheel flows within a path formed by the channel. The airflow from the channel of the fixed blades at the bottom (3) is driven into a rotating flow toward the wheel.

[0024] In some embodiments, the fixed blades at the bottom form a multi-armed Archimedean spiral pattern; and / or the fixed blades at the top of the housing form a single-armed or multi-armed Archimedean spiral pattern.

[0025] This arrangement provides a longer airflow path, thereby increasing the heat exchange surface area. In addition, the Archimedes spiral configuration provides a consistent path width, thereby reducing kinetic energy loss caused by fluctuations in airflow path width and gradual changes in flow direction.

[0026] In some embodiments, the number of fixed blades at the bottom of the housing is a multiple of the number of fixed blades at the top of the housing.

[0027] In some embodiments, the helical direction of the fixed blades at the bottom of the housing is opposite to the helical direction of the fixed blades at the top of the housing.

[0028] In some embodiments, the channels formed by the fixed blades are formed with the same width.

[0029] In some embodiments, the cooling fins have a backward-curved arrangement, a forward-curved arrangement, or a radial arrangement.

[0030] In some embodiments, the bottom further includes a base and an outer edge surrounding the base; the top further includes a cover and an outer edge surrounding the cover; and a fixing blade at the top is fixed to the top cover and the outer edge, and a fixing blade at the bottom is fixed to the bottom base and the outer edge.

[0031] In some embodiments, the laser reflective unit further includes a fluid port located between a base and a cover at the bottom to form a compartment for receiving coolant. A protrusion is formed on the outer surface of the base to distribute the coolant across the outer surface and increase the heat exchange surface between the base and the coolant within the compartment.

[0032] In some embodiments, the laser reflective unit further includes a seal formed to fill the space between the outer surface of the base and the cover.

[0033] In some embodiments, the cover and outer edge form curved surfaces configured to guide airflow from the top to the bottom of the housing.

[0034] In some embodiments, pins are formed on the fixed blade.

[0035] In some embodiments, a perforation is formed on the top side to allow airflow toward the top side of the wheel. Furthermore, the motor is configured to drive the wheel to rotate.

[0036] In some embodiments, the top and bottom fixed blades are arranged such that the fixed blades maintain the same arrangement when the radial alignment between the top and bottom changes at an angle.

[0037] In some embodiments, the angle is determined based on the greatest common divisor (GCD) between the number of fixed blades at the top and the number of fixed blades at the bottom.

[0038] In some embodiments, the cooling fins are configured to regulate the pressure and speed of the air circulating within the laser reflecting unit.

[0039] In some embodiments, the top has a compartment in its central portion surrounded by fixed blades on the top for receiving a wheel. The diameter of the wheel is smaller than the diameter of the compartment in the top.

[0040] Therefore, another aspect of this disclosure provides a method for operating a laser reflecting unit, the method comprising: rotating a wheel disposed within a housing, the wheel having cooling fins configured to generate airflow during rotation; guiding the airflow through at least one channel formed by at least one fixed blade at the top in a direction toward an outer edge of the top of the housing; guiding the airflow in a direction toward a channel formed by fixed blades at the bottom; guiding the airflow through the channel formed by fixed blades at the bottom in a direction toward a center of the bottom; and guiding the airflow in a direction from the center of the bottom to the center of the wheel. A low pressure is generated between the cooling fins to drive the airflow back to the wheel.

[0041] In some embodiments, the airflow generated by the wheel is generated to flow in a direction tangential to the circumference of the wheel.

[0042] In some embodiments, the cooling fins have a backward-curved arrangement, a forward-curved arrangement, or a radial arrangement.

[0043] In some embodiments, the method of operating the laser reflective unit further includes guiding airflow toward the top side of the wheel through perforations.

[0044] In some embodiments, the method of operating the laser reflective unit further includes fastening the top and bottom to form a sealed compartment. The fixing blades at the top and bottom are arranged such that, during fastening, the fixing blades maintain the same arrangement when the radial alignment between the top and bottom changes at an angle.

[0045] In some embodiments, the method of operating the laser reflection unit further includes determining the angle based on the greatest common divisor (GCD) between the number of fixed blades at the top and the number of fixed blades at the bottom.

[0046] In some embodiments, the fixed blades at the bottom form a multi-armed Archimedean spiral pattern; and / or at least one fixed blade at the top of the housing forms a single-armed or multi-armed Archimedean spiral pattern.

[0047] In some embodiments, the number of fixing blades at the bottom of the housing is a multiple of the number of at least one fixing blade at the top of the housing.

[0048] In some embodiments, the helical direction of the fixed blades at the bottom of the housing is opposite to the helical direction of the fixed blades at the top of the housing.

[0049] In some embodiments, the channels formed by the fixed blades are formed with the same width.

[0050] In some embodiments, the method of operating the laser reflection unit further includes providing coolant between the base and the cover at the bottom through a fluid port; and agitating the coolant by means of protrusions formed on the outer surface of the base to distribute the coolant throughout the outer surface and increase the heat exchange surface between the base and the coolant in the compartment formed by the base and the cover.

[0051] In some embodiments, the cooling fins are configured to regulate the pressure and speed of the airflow circulating within the laser reflecting unit.

[0052] It should be understood that both the foregoing general description and the following detailed description are exemplary only and are intended to provide further explanation of the claimed invention. Other advantages and features of the invention will become apparent from the following detailed description, drawings, and claims. Attached Figure Description

[0053] These and other features, aspects, and advantages of the apparatus, systems, and methods disclosed herein will be better understood from the following description, the appended claims, and the accompanying drawings, wherein: Figure 1 A vertical cross-sectional view of a laser reflection unit according to some embodiments of the present disclosure is shown; Figure 2 A perspective view of a wheel of a laser reflecting unit according to some embodiments of the present disclosure is shown; Figure 3 A perspective view of the top of the housing of a laser reflecting unit according to some embodiments of the present disclosure is shown; Figure 4a A top view of the bottom of the housing of a laser reflecting unit according to some embodiments of the present disclosure is shown; Figure 4b A bottom view of the bottom of the housing of a laser reflecting unit according to some embodiments of the present disclosure is shown; Figure 5 A horizontal cross-sectional view of the top and wheels of the housing of a laser reflecting unit according to some embodiments of the present disclosure is shown; Figure 6 An exploded schematic diagram of a laser reflection unit according to some embodiments of the present disclosure is shown; and Figure 7a and Figure 7b A perspective view of a wheel of a laser reflection unit according to some other embodiments of the present disclosure is shown. Detailed Implementation

[0054] This disclosure will now be described more fully below with reference to the accompanying drawings, in which exemplary embodiments of the disclosure are shown. However, this disclosure may be embodied in many different forms and should not be construed as limited to the exemplary embodiments described herein. Rather, these exemplary embodiments are provided to make this disclosure sufficient and complete, and to fully convey the scope of the disclosure to those skilled in the art. Similar reference numerals refer to similar elements throughout.

[0055] The terminology used herein is for the purpose of describing particular exemplary embodiments only and is not intended to limit this disclosure. As used herein, the singular forms “a,” “the,” and “the” are also intended to include the plural forms unless the context clearly indicates otherwise. It should also be understood that, when used herein, the terms “comprising” and / or “including,” or “comprising with” and / or “containing,” or “having” and / or “having” specify the presence of the stated feature, region, integer, step, operation, element, and / or component, but do not preclude the presence or addition of one or more other features, regions, integers, steps, operations, elements, components, and / or groups thereof.

[0056] Unless otherwise defined, all terms used herein (including technical and scientific terms) have the same meaning as commonly understood by one of ordinary skill in the art to which this disclosure pertains. It should also be understood that terms (e.g., those defined in commonly used dictionaries) should be interpreted as having the meaning consistent with their meaning in the context of the relevant art and this disclosure, and not as having an idealized or overly formal meaning, unless expressly defined herein.

[0057] Figure 1 A vertical cross-sectional view of the laser reflection unit 1 according to the present disclosure is shown. The laser reflection unit 1 can be applied to a laser phosphor projector for converting high-intensity blue laser light into colored light.

[0058] The laser reflector unit 1 has a housing and a wheel 4 disposed within the housing. The housing includes a top 2 and a bottom 3. In some embodiments, the top 2 and bottom 3 may be physically separated from each other for inspection and / or repair purposes. In further embodiments, the housing may include other numbers of parts. The top 2 and bottom 3 may be coupled to each other using fastening elements. In some embodiments, the fastening elements may be screws or clamping elements. The housing is formed with compartments for receiving the wheel 4 and the heat exchanger described below therein. The wheel is configured to rotate within the internal compartments or chambers of the housing. The housing is further configured to prevent dust from entering the chambers.

[0059] The top 2 cover 22 is perforated to form an opening 99, and the fitting 100 is disposed in the opening 99. The fitting 100 is configured to receive an optical assembly. The optical assembly may include a first lens 101 and a second lens 103 configured to guide light on the phosphor layer. The second lens 103 may be disposed above the first lens 101.

[0060] Figure 2 A perspective view of a wheel 4 of a laser reflecting unit 1 according to some embodiments of the present disclosure is shown. The wheel 4, arranged in a chamber, can be rotated by an actuator. In some embodiments, the actuator can be a motor. The laser reflecting unit 1 may further include a motor 5 arranged to drive the wheel 4 within the housing to rotate. The motor 5 is disposed on the center portion of the bottom 4 of the housing using fastening elements. In some embodiments, the center portion may have a machined surface 6. The laser reflecting unit 1 includes a power cable 8 as shown in FIG. 4 to supply power to the motor 5 of the wheel.

[0061] like Figure 2 As shown, wheel 4 has a circular outer peripheral profile 42. Wheel 4 has a top side 43 and a bottom side 44 opposite to the top side 43. The top side 43 is preferably provided with a phosphor layer 45 for converting the incident laser beam into a reflected beam. Wheel 4 may further include a plurality of concentric portions, such as a radially central portion 47, a radially intermediate annular portion 48, and a radially outer annular portion 49. The radially outer annular portion 49 is adjacent to the outer peripheral profile 42 of wheel 4. The radially intermediate annular portion 48 is disposed between the radially central portion 47 and the radially outer annular portion 49.

[0062] During operation of the laser reflection unit 1, the wheel 4 rotates and reflects the incident laser beam Li, which enters through the optical components (which may include the second lens 103 and the first lens 101) and the opening 99, toward the phosphor layer 45 on the wheel 4. The incident beam is then reflected by the phosphor layer 45 into a reflected light beam Lr, which propagates outward through the opening 99 and the optical components. Typically, the incident beam Li can be blue laser light, while the reflected beam Lr can be white light. However, other beam characteristics are also applicable, such as beams with other spectral characteristics. Furthermore, another lens structure can be applied, for example, including other mounting elements and / or fewer or more than two lenses. Preferably, the optical components, or more specifically the lenses 101, 103, are sealed to form a dustproof sealed compartment or chamber within the housing.

[0063] A phosphor layer 45 is disposed on the top side 43 of the radially outer annular portion 49. The radially intermediate annular portion 48 preferably has a plurality of uniformly and annularly distributed perforations 46, thereby allowing airflow to the top side 43 of the wheel 4. Further, the bottom side 44 of the radially central portion 47 of the wheel 4 is mounted on the drive portion of the motor 5. In some other embodiments, the wheel can be constructed, for example, by including more radial annular portions or by mounting the top side 43 of the wheel 4 to a motor that rotatably drives the wheel 4.

[0064] The bottom side 44 of the wheel 4 is provided with cooling fins 41 shaped like radial fan fins capable of generating local overpressure to induce airflow in a radially outward direction. The wheel 4 acts as both a fan and a radiator. The cooling fins 41 can be configured to have a backward-curved arrangement, a forward-curved arrangement, or a radial arrangement. In other words, the cooling fins 41 can be bent in the direction of rotation of the wheel 4, bent in the opposite direction of rotation of the wheel 4, or extend directly from the center of the wheel 4.

[0065] In some other embodiments, the cooling fins can be configured with different structures. In one exemplary embodiment, such as Figure 7a As shown, the cooling fins 41a of wheel 4b can be arranged in a manner similar to that described above. However, to increase cooling performance, the cooling fins 41a can be further divided into multiple segments, such that there is space between two adjacent segments of the fin. The space between two adjacent segments of the cooling fin 41a allows the boundary layer of the cooling air to be broken. In this way, heat transfer from the segmented fins to the air is improved by allowing more momentum and heat exchange between adjacent fluid particles.

[0066] In one exemplary embodiment, such as Figure 7b As shown, the cooling fins 41b of wheel 4b can be configured to have an airfoil-like profile. The airfoil shape provides a lift effect to cool the air, thereby increasing speed and heat transfer.

[0067] Therefore, in addition to the arrangement of the cooling fins, the shape of the cooling fins further improves the cooling performance of the wheel. Variations in the shape of the cooling fins are used to regulate the pressure and velocity of the cooling air.

[0068] When the incident laser beam Li is converted into a reflected beam Lr, some light energy is lost and converted into heat that is absorbed by the phosphor layer 45 and applied to the top side 43 of the wheel 4. The heat is transferred into the wheel material and dissipated through the bottom side 44 of the wheel 4. During rotation, the air generated by the cooling fins 41 on the bottom side 44 of the wheel 4 flows outward to the outer periphery 42 of the wheel 4. The heat from the wheel 4 is dissipated through air convection between the cooling fins 41.

[0069] To further dissipate heat, the top 2 and bottom 3 of the housing are further formed to include heat exchangers. Figure 3 A perspective view of the top 2 of the housing of a laser reflection unit 1 according to some embodiments of the present disclosure is shown. Figure 4a A top view of the bottom 3 of the housing of a laser reflecting unit 1 according to some embodiments of the present disclosure is shown. Figure 4b A bottom view of the bottom 3 of the housing of the laser reflection unit 1 according to some embodiments of the present disclosure is shown.

[0070] The laser reflecting unit 1 further includes a heat exchanger disposed at the top 2 of the housing for cooling and guiding airflow. The heat exchanger at the top 2 includes at least one fixed blade 21 arranged around the central axis (A). When multiple fixed blades 21 are present, they are arcuate in shape, configured to form a pattern resembling an Archimedean spiral with multiple arms. The top 2 further includes an outer edge 23 surrounding a cover 22. The inner surface of the outer edge 23 and the cover 22 are formed with curved surfaces for guiding airflow within the housing. At least one fixed blade 21 is further fixed to the cover 22 and the outer edge 23. The at least one fixed blade 21, the cover 22, and the outer edge 23 form a path to receive air generated by the cooling fins 41. Preferably, the channels formed between two radially adjacent fixed blades 21 have the same width. When only one fixed blade is present, arranged spirally around the axis, the channels formed between the walls of the fixed blade preferably have a constant width.

[0071] In some embodiments, the channel formed by the walls of at least one fixed blade 21, 31 is a spiral channel. The laser reflecting unit 1 further includes a heat exchanger disposed at the bottom 3 of the housing for cooling and guiding airflow. The heat exchanger at the bottom 3 includes at least one fixed blade 31, for example, as shown in the image. Figure 4a As shown. At least one fixed blade 31 is an arcuate structure configured to form a pattern resembling an Archimedean spiral with multiple arms. The bottom 3 includes a base 33 and an outer edge 34 surrounding the base 33. The fixed blade 31 is further fixed to the outer edge 34 and the base 33. The fixed blade 31, the outer edge 34, and the base 33 form at least one channel to receive airflow generated from the top 2 by the cooling fins 41. The airflow generated by the cooling fins 41 is received by the at least one channel formed by the fixed blade 21 and directed toward the outer edge 23 of the top 2. The inner wall formed by the outer edge 23 then pushes the airflow toward the bottom 3. The channel formed by the fixed blade 31, the outer edge 34, and the base 33 receives airflow from the top 2 to form a path for the airflow to flow toward the central portion of the bottom 3. At least one channel in the bottom 3 is arranged in a spiral shape such that the airflow exiting the channel flows in the direction of rotation.

[0072] The top 2 and bottom 3 of the outer casing can be coaxial with the wheel 4. Furthermore, in some embodiments, the Archimedean spiral formed by the fixed blades 31 and 21 is coaxial with the cooling fins 41 of the wheel 4.

[0073] The bottom 3 of the housing further includes a cover 35 and fluid ports 32a, 32b disposed between the outer surface 33a of the base 33 and the cover 35. The fluid ports 32a, 32b can be coupled to a cooling system in the projector for draining coolant from the laser phosphor projector. In some embodiments, the space between the base 33 and the cover 35 forms a compartment for receiving and circulating coolant. A plurality of protrusions 33b are further disposed on the outer surface 33a of the base 33. In an exemplary embodiment, as shown... Figure 4b As shown, protrusion 33b is formed as a concentric annular protrusion. However, other forms of protrusions can be used to interfere with the flow of coolant. In this way, the protrusion is constructed to generate turbulence in the flow of coolant and prevent the coolant from taking the shortest path from one port to another. Therefore, the coolant can be evenly distributed to the outer surface area of ​​the base.

[0074] Furthermore, the seal is preferably configured to fill the space between the outer surface 33a of the base 33 and the cover 35 to form a sealed compartment. Additionally, a plurality of fastening elements 37 can be used to mechanically attach the base 33 and the cover 35. The fastening elements 37 can be screws or clamping elements.

[0075] The housing may be made of a thermally conductive material. In some embodiments, the housing may be made of a metal (e.g., magnesium). Further, the rotating wheel 4 and the fixed blades 21, 31 may also be made of any suitable material. In some embodiments, the rotating wheel 4 and the fixed blades 21, 31 may be made of a metal (e.g., magnesium). In some embodiments, the top 2 and bottom 3 are formed with pins 24, 38 configured to protect the fixed blades 21, 31 from deformation during manufacturing. The pins 24, 38 are configured to absorb forces during demolding. Further, the pins 24, 38 may be strategically placed along the fixed blades 21, 31 to induce turbulence and / or increase heat exchange in target areas as needed.

[0076] In some embodiments, the configuration of the retaining blades 31 and 21 allows for the use of a mold to shape the top 2 and bottom 3. This eliminates the need to form the retaining blades 21 and 31 on the top 2 and bottom 3 respectively using chemical (e.g., adhesive) or thermal (e.g., welding, brazing) bonding techniques. Furthermore, since no additional components are required to form the retaining blades 21 and 31, the edges of the top 2 and bottom 3 can be shaped with standard surfaces or forms, facilitating the use of standard gaskets, such as O-rings, to create a sealing joint (or leak-proof junction) between the surfaces of the top 2 and bottom 3.

[0077] Figure 5 A horizontal sectional view of the top 2 and wheel 4 of a housing of a laser reflecting unit according to some embodiments of the present disclosure is shown. The top 2 of the housing is arranged concentrically with the wheel 4. The top 2 has a compartment to receive the wheel 4. The compartment is located at the center of the top and is surrounded by a fixing blade 21. The diameter of the wheel 4 is smaller than the diameter of the compartment in the top 2. Figure 1 As shown, at least one fixed blade 21 and a cooling fin 41 are arranged to overlap at least one fixed blade 31. In some embodiments, at least one fixed blade 21, 31 are arranged at the top 2 and bottom 3, respectively, such that the arrangement of the fixed blades 21, 31 remains the same when the radial alignment between the top 2 and bottom 3 changes by a certain angle. In an exemplary embodiment, the angle that allows the fixed blades to maintain the same arrangement (or rotational symmetry between the two arrangements) is determined based on the greatest common divisor (GCD) between the number of fixed blades 21 at the top 2 and the number of fixed blades 31 at the bottom 3: 360° / (GCD (#fins in the top plate, #fins in the bottom plate)) When 8 fixed blades are formed at the bottom and 4 fixed blades are formed at the top, the angle is calculated as 360° / (GCD(8,4) = 360° / 4 = 90°. Therefore, the angle can be a multiple of 90 degrees, which corresponds to the rotational symmetry of order 4.

[0078] Further, the number of fixing blades 31 in the bottom 3 is preferably a multiple of the number of fixing blades 21 in the top 2. In some embodiments, the number of fixing blades 21 in the top 2 is optionally less than or equal to the number of fixing blades 31 in the bottom 3. In an exemplary embodiment, when the number of fixing blades 31 is 8, the number of fixing blades 21 can be 1, 2, 4, or 8. The number of fixing blades 21 and 31 is not limited thereto. The number of fixing blades 21 and 31 can be determined according to application specifications and manufacturing constraints.

[0079] Figure 6An exploded schematic diagram of a laser reflecting unit according to some embodiments of the present disclosure is shown. The wheel 4 is configured to have the same central axis A as the Archimedean spiral pattern formed by the fixed blades 21, 31. By constructing the fixed blades 21, 31 in an Archimedean spiral pattern, the distance between the fixed blades 21, 31 remains constant along the airflow path. Therefore, this minimizes expansion or contraction within the flow path, thereby reducing kinetic energy loss of the airflow. When the top 2 and bottom 3 are mechanically attached to each other during operation, sidewalls are formed extending from the top 2 to the bottom 3. Preferably, the helical rotation direction of the fixed blades 31 in the bottom of the housing is opposite to the helical rotation direction of the fixed blades 21 in the top of the housing. The fixed blades 21, 31 in the housing are arranged helically around the central axis, which creates a helical path for the airflow generated by the cooling fins of the wheel 4. The helical motion of the airflow helps to uniformly distribute the cooling effect around the annular phosphor layer on the top side of the wheel.

[0080] The laser reflecting unit 1 is configured to use a convection cooling system, wherein heat from the wheel is transferred to the generated airflow and subsequently cooled by a heat exchanger. The heated airflow generated by the wheel 4 is directed to heat exchange surfaces, such as fixed blades 21 and 31, for further cooling before returning to the wheel 4. During operation of the laser reflecting unit 1, the wheel 4 is configured to rotate and induce airflow. Figure 6As shown, the counterclockwise rotation of wheel 4 generates an airflow traveling in a counterclockwise direction D1 tangent to the circumference of wheel 4. The airflow then enters, in a counterclockwise direction D2, a channel or path formed by the wall of fixed blade 21 and / or a channel or path formed by the fixed blade 21 and the sidewall along the outer edge 23. The fixed blade 21 of the top 2 is configured to receive the airflow generated by the cooling fins 41 of the wheel from the same plane as wheel 4 rotates. Upon reaching the sidewall along the outer edge 23, the curved surface of the sidewall along the outer edge 23 guides the airflow to the bottom 3 of the housing. The airflow is further guided by the sidewall along the outer edge 34 of the bottom 3 to the center of the bottom 3. The channel formed by the wall of fixed blade 31 guides the cooling airflow to the center of the bottom 3. Furthermore, the rotating airflow is guided to wheel 4 in the direction D4 shown. The rotating wheel 4 creates a low pressure, thereby drawing the cooling air upwards from the center of the bottom 3 towards the center of wheel 4. Furthermore, the cooling air from the bottom 3 cools the cooling fins 41, and by enabling the cooling fins 41 to continuously absorb heat from the phosphor layer and dissipate heat through airflow, it further facilitates the cooling of the phosphor layer disposed above the cooling fins 41. The cooling fins 41, the fixed blades 21 and 31, and the coolant allow air cooling, thereby providing cooling air to the phosphor layer of the wheel 4. In other words, the shape of the channel formed by the fixed blades 31, the outer edge 34, and the base 33 guides the airflow toward the center of the bottom 3, while the rotation of the wheel 4 pulls the airflow upward, allowing the airflow to be guided in direction D4. Therefore, direction D4 can be described as an airflow with a swirling direction. The combination of the outward Archimedean spirals and the inward Archimedean spirals of the fixed blades 21 and 31 helps to retain a large portion of the angular momentum generated by the rotating wheel. Therefore, this design minimizes the drag on the wheel 4, potentially requiring less torque to maintain continuous airflow within the laser reflecting unit 1. Therefore, the torque provided by the motor 5 can be maximized by increasing the rotational speed.

[0081] According to some embodiments of this disclosure, the cooling fins 41 and the fixed blades 21, 31 are configured to provide the maximum surface area in contact with the airflow within the housing, and the maximum air path to increase the time for heat transfer. The extended flow path length increases the contact (and interaction) between heated air molecules and the cooling surfaces (i.e., the fixed blades 21, 31). The path formed by the fixed blades 21 to allow airflow toward the outer edge 23 of the top 2 has a length greater than the radial distance between the wheel 4 and the outer edge 23 of the top 2. In some embodiments, the path formed by the fixed blades 31 to allow airflow toward the center of the bottom 3 has a length greater than the radius of the bottom 3 or the radial distance between the two ends of the fixed blades 31. The helical configuration of the fixed blades 21, 31 provides a long airflow path for the airflow generated by the rotation of the wheel 4. The large heat transfer area formed by the long airflow path and the high airflow velocity generated by the wheel 4 provide lower thermal resistance for the laser reflector unit. Furthermore, the fixed blades 21, 31 generate air turbulence to increase heat collection. In this way, the heat threshold of the laser reflector unit 1 can be increased, and the maximum luminous flux that the projector can project can be further increased.

[0082] The laser reflector unit utilizes a convection cooling system designed to maximize efficiency. Ideally, the cooling system achieves a long airflow path per unit volume, thereby maximizing the contact area for heat exchange and heat transfer per unit area while minimizing airflow energy loss. When the heat exchange surfaces are arranged radially, the length of the airflow path should be limited within the planar radii of the top and bottom of the laser reflector unit. Furthermore, the width of the airflow path varies, either expanding or contracting, depending on the airflow direction toward the center of the laser reflector unit. By arranging the fixed blades in an Archimedean spiral configuration, the airflow path provided for heat exchange is larger than the planar radii of the top and bottom of the laser reflector unit. The Archimedean spiral arrangement provides a longer airflow path. Furthermore, the longer flow path of the fixed-blade Archimedean spiral arrangement also provides a higher heat exchange surface area. The fixed blades in the Archimedean spiral arrangement provide an airflow path with constant width and a low and gradually changing path curvature. The Archimedean spiral configuration provides a consistent path width, thereby reducing the loss of air molecule kinetic energy due to the expansion and contraction of the airflow path width and gradual changes in flow direction. Furthermore, the constant path width reduces or virtually eliminates aeroacoustic noise that may be caused by expansion and contraction. The low and gradual increase in path curvature lowers the peak intensity of tonal aeroacoustic noise.

[0083] Therefore, this disclosure provides a laser reflection unit for a laser phosphor projector, the laser reflection unit including a housing having a top and a bottom mechanically fastened to the top, the top and bottom correspondingly having fixed blades disposed on the inner sidewalls of the housing, the fixed blades being arranged spirally around the central axis of the laser reflection unit; the housing further having sidewalls extending from the top to the bottom, and a wheel disposed within the housing and having a top side and a bottom side opposite to the top side, the top side having a phosphor layer arranged in a ring for converting an incident laser beam into a reflected beam, the bottom side... The device is provided with cooling fins, wherein the wheel is rotatably received on the top of the housing such that the cooling fins are arranged to be surrounded by fixed blades at the top and configured to rotate about a central axis, and wherein the fixed blades at the top are configured to receive airflow generated by the cooling fins of the wheel from the same plane as the wheel rotates, and to spirally guide the airflow outward toward the sidewall of the housing, and then downward along the sidewall toward the fixed blades at the bottom, the fixed blades at the bottom being configured to spirally guide the airflow inward toward the center at the bottom, and upward through the center to the cooling fins of the wheel, such that the airflow cools the phosphor layer.

[0084] In some embodiments, the number of fixed blades at the bottom of the housing is a multiple of the number of fixed blades at the top of the housing.

[0085] In some embodiments, the helical direction of the fixed blades at the bottom of the housing is opposite to the helical direction of the fixed blades at the top of the housing.

[0086] In some embodiments, the channels between the fixed blades are formed with the same width.

[0087] In some embodiments, the channels formed by at least one fixed blade at the top have the same width.

[0088] In some embodiments, the bottom further includes a base and an outer edge surrounding the base. The top further includes a cover and an outer edge surrounding the cover. Furthermore, a fixing blade at the top is fixed to the cover and the outer edge at the top, and a fixing blade at the bottom is fixed to the base and the outer edge at the bottom.

[0089] In some embodiments, the laser reflective unit further includes a fluid port located between a base and a cover at the bottom to form a compartment for receiving coolant. A protrusion is formed on the outer surface of the base to distribute the coolant across the outer surface and increase the heat exchange surface between the base and the coolant within the compartment.

[0090] In some embodiments, the laser reflective unit further includes a seal formed to fill the space between the outer surface of the base and the cover.

[0091] In some embodiments, the cover and outer edge form a curved surface configured to guide airflow from the top to the bottom of the housing.

[0092] In some embodiments, the cooling fins have a backward-curved arrangement, a forward-curved arrangement, or a radial arrangement.

[0093] In some embodiments, a perforation is made on the top side to form a perforation 46, thereby allowing airflow toward the top side of the wheel. Furthermore, the motor is configured to drive the wheel to rotate.

[0094] In some embodiments, pins are formed on the fixed blade.

[0095] In some embodiments, the top and bottom fixed blades are arranged such that the fixed blades maintain the same arrangement when the radial alignment between the top and bottom changes at an angle.

[0096] In some embodiments, the angle can be determined based on the greatest common divisor (GCD) between the number of fixed blades at the top and the number of fixed blades at the bottom.

[0097] In some embodiments, the cooling fins are configured to regulate the pressure and speed of the air circulating within the laser reflecting unit.

[0098] In some embodiments, the top has a compartment in its central portion surrounded by fixed blades on the top for receiving a wheel. The diameter of the wheel is smaller than the diameter of the compartment in the top.

[0099] Therefore, another aspect of this disclosure provides a laser reflecting unit for a laser phosphor projector, the laser reflecting unit comprising a housing having a top and a bottom mechanically fastened to the top, the top and bottom respectively having fixed blades forming a helical channel; and a wheel disposed within the housing and configured to generate airflow in a direction tangential to the circumference of the wheel. The wheel has a phosphor layer arranged annularly on the top side of the wheel. The fixed blades at the top form a compartment to receive the wheel. The airflow generated by the wheel flows within a path formed by the channel. The airflow from the channel of the fixed blades at the bottom (3) is driven into a rotating flow toward the wheel.

[0100] In some embodiments, the fixed blades at the bottom form a multi-armed Archimedean spiral pattern; and / or the fixed blades at the top of the housing form a single-armed or multi-armed Archimedean spiral pattern.

[0101] In some embodiments, the number of fixed blades at the bottom of the housing is a multiple of the number of fixed blades at the top of the housing.

[0102] In some embodiments, the helical direction of the fixed blades at the bottom of the housing is opposite to the helical direction of the fixed blades at the top of the housing.

[0103] In some embodiments, the channels formed by the fixed blades are formed with the same width.

[0104] In some embodiments, the cooling fins have a backward-curved arrangement, a forward-curved arrangement, or a radial arrangement.

[0105] In some embodiments, the bottom further includes a base and an outer edge surrounding the base; the top further includes a cover and an outer edge surrounding the cover; and a fixing blade at the top is fixed to the top cover and the outer edge, and a fixing blade at the bottom is fixed to the bottom base and the outer edge.

[0106] In some embodiments, the laser reflecting unit further includes a fluid port located between a base and a cover at the bottom to form a compartment for receiving coolant. A protrusion is formed on the outer surface of the base to distribute the coolant across the outer surface and to increase the heat exchange surface between the base and the coolant within the compartment.

[0107] In some embodiments, the laser reflective unit further includes a seal formed to fill the space between the outer surface of the base and the cover.

[0108] In some embodiments, the cover and outer edge form a curved surface configured to guide airflow from the top to the bottom of the housing.

[0109] In some embodiments, pins are formed on the fixed blade.

[0110] In some embodiments, a perforation is formed on the top side to allow airflow toward the top side of the wheel. Furthermore, the motor is configured to drive the wheel to rotate.

[0111] In some embodiments, the top and bottom fixed blades are arranged such that the fixed blades maintain the same arrangement when the radial alignment between the top and bottom changes at an angle.

[0112] In some embodiments, the angle can be determined based on the greatest common divisor (GCD) between the number of fixed blades at the top and the number of fixed blades at the bottom.

[0113] In some embodiments, the cooling fins are configured to regulate the pressure and speed of the air circulating within the laser reflecting unit.

[0114] In some embodiments, the top has a compartment in its central portion surrounded by fixed blades on the top for receiving a wheel. The diameter of the wheel is smaller than the diameter of the compartment in the top.

[0115] Therefore, another aspect of this disclosure provides a method for operating a laser reflecting unit, the method comprising: rotating a wheel disposed within a housing, the wheel having cooling fins configured to generate airflow during rotation; guiding the airflow through at least one channel formed by at least one fixed blade at the top in a direction toward an outer edge of the top of the housing; guiding the airflow in a direction toward a channel formed by fixed blades at the bottom; guiding the airflow through the channel formed by fixed blades at the bottom in a direction toward a center of the bottom; and guiding the airflow in a direction from the center of the bottom to the center of the wheel. A low pressure is generated between the cooling fins to drive the airflow back to the wheel.

[0116] In some embodiments, the airflow generated by the wheel is generated to flow in a direction tangential to the circumference of the wheel.

[0117] In some embodiments, the cooling fins have a backward-curved arrangement, a forward-curved arrangement, or a radial arrangement.

[0118] In some embodiments, the method of operating the laser reflective unit further includes guiding airflow toward the top side of the wheel through perforations.

[0119] In some embodiments, the method of operating the laser reflective unit further includes fastening the top and bottom to form a sealed compartment. The fixing blades at the top and bottom are arranged such that, during fastening, the fixing blades maintain the same arrangement when the radial alignment between the top and bottom changes at an angle.

[0120] In some embodiments, the method of operating the laser reflection unit further includes determining the angle based on the greatest common divisor (GCD) between the number of fixed blades at the top and the number of fixed blades at the bottom.

[0121] In some embodiments, the fixed blades at the bottom form a multi-armed Archimedean spiral pattern; and / or at least one fixed blade at the top of the housing forms a single-armed or multi-armed Archimedean spiral pattern.

[0122] In some embodiments, the number of fixing blades at the bottom of the housing is a multiple of the number of at least one fixing blade at the top of the housing.

[0123] In some embodiments, the helical direction of the fixed blades at the bottom of the housing is opposite to the helical direction of the fixed blades at the top of the housing.

[0124] In some embodiments, the channels formed by the fixed blades are formed with the same width.

[0125] In some embodiments, the method of operating the laser reflection unit further includes providing coolant between the base and the cover at the bottom through a fluid port; and agitating the coolant by means of protrusions formed on the outer surface of the base to distribute the coolant throughout the outer surface and increase the heat exchange surface between the base and the coolant in the compartment formed by the base and the cover.

[0126] In some embodiments, the cooling fins are configured to regulate the pressure and speed of the airflow circulating within the laser reflecting unit.

[0127] While the invention has been described above with reference to specific embodiments, this is for clarification and not for limitation. Those skilled in the art will understand that various modifications and different combinations of the disclosed features are possible without departing from the scope of the invention.

[0128] Use the following figure references throughout the text and figures: 1-Laser Reflection Unit 2- Top of the outer casing 21-Fixed Blade 22-Top cover 23 - Outer edge of the top 24-pin 3- Bottom of the casing 31-Fixed blade 32a-Fluid Port 32b-Fluid Port 33-The base at the bottom 33a - Outer surface of the base 33b-protrusion 34 - Outer edge of the bottom 35- Bottom Cover 36 - Seal between the base and the cover at the bottom 37 - Fastening elements for attaching the base and cover to the bottom. 38-pin 4-Spinning wheel 41-Cooling fins 41a-Segmented Cooling Fins 41b-Airfoil Cooling Fin 42-Circular outer perimeter contour of the wheel 43-Top side of the wheel 44-wheel bottom side Phosphor layer on the top side of the 45-wheel 46-perforation 47 - Radial center of the wheel 48-Ring radial intermediate annular portion 49-Ring radial outer annular portion 5-Motor 6-Machining plane 8-Power Cable 99 - An opening in the top cover for receiving optical components. 100-The fitting in the opening of the cover for receiving optical components. 101 - The first lens of the optical assembly 103 - Second lens of optical assembly D1 - The counterclockwise airflow direction tangent to the circumference of the wheel (e.g., Figure 6 direction shown) D2 - The counterclockwise airflow direction through the channel formed by the wall of the fixed blades in the top (when the airflow travels from the wheel to the outer edge of the top). D4 - The direction of the airflow generated by the rotation of the wheel, which pulls the cooling air from the center of the bottom upwards towards the center of the wheel (when the airflow is directed toward the wheel for further cooling).

Claims

1. A laser reflection unit (1) for a laser phosphor projector, comprising: The housing has a top (2) and a bottom (3) mechanically fastened to the top (2), the top (2) and the bottom (3) respectively having fixing blades (21, 31) disposed on the inner sidewall of the housing, the fixing blades (21, 31) being arranged in a spiral around the central axis (A) of the laser reflecting unit, and the housing further having a sidewall extending from the top to the bottom; as well as A wheel (4) is arranged inside the housing and has a top side and a bottom side opposite to the top side. The top side is provided with a phosphor layer (45) arranged in a ring on the top side (43) for converting the incident laser beam into a reflected beam. The bottom side is provided with cooling fins (41, 41a, 41b). in, The wheel (4) is rotatably received on the top of the housing such that the cooling fins (41, 41a, 41b) are arranged to be surrounded by the fixed blades (21) of the top (2) and configured to rotate about the central axis (A), wherein the fixed blades (21) of the top (2) are configured to receive airflow generated by the cooling fins of the wheel from the same plane as the wheel rotates, and to spirally guide the airflow outward toward the sidewall of the housing, and then downward along the sidewall toward the fixed blades (31) of the bottom (3), the fixed blades (31) of the bottom (3) being configured to spirally guide the airflow inward toward the center of the bottom (3), and upward through the center to the cooling fins (41, 41a, 41b) of the wheel (4), so that the airflow cools the phosphor layer.

2. The laser reflection unit according to claim 1, wherein, The number of fixed blades (31) at the bottom (3) of the housing is a multiple of the number of fixed blades (21) at the top (2) of the housing.

3. The laser reflection unit according to claim 1 or 2, wherein, The spiral direction of the fixed blade (31) at the bottom (3) of the outer casing is opposite to the spiral direction of the fixed blade (21) at the top (2) of the outer casing.

4. The laser reflection unit according to any one of claims 1 to 3, wherein, The channels between the fixed blades (31) are formed with a uniform width.

5. The laser reflection unit according to any one of claims 1 to 4, wherein, The channel formed by at least one fixed blade (21) of the top (2) has the same width.

6. The laser reflection unit according to any one of claims 1 to 5, wherein, The bottom (3) further includes a base (33) and an outer edge (34) surrounding the base (33); The top (2) further includes a cover (22) and an outer edge (23) surrounding the cover (22); and The fixing blade (21) of the top (2) is fixed to the cover (22) and the outer edge (23) of the top (2), and the fixing blade (21) of the bottom (3) is fixed to the base (33) and the outer edge (34) of the bottom (3).

7. The laser reflection unit according to any one of claims 1 to 6, further comprising: A fluid port (32) located between the base (33) and the cover (35) at the bottom (3) forms a compartment for receiving coolant; A protrusion (33b) is formed on the outer surface (33a) of the base (33) to distribute the coolant throughout the outer surface (33a) and increase the heat exchange surface between the base (33) and the coolant in the compartment.

8. The laser reflection unit according to any one of claims 1 to 7, further comprising: A seal (36) is formed to fill the space between the outer surface of the base (33) and the cover (35).

9. The laser reflecting unit according to any one of claims 6 to 8, wherein, The cover (22) and the outer edge (23) form a curved surface configured to guide airflow from the top (2) to the bottom (3) of the outer shell.

10. The laser reflection unit according to any one of claims 1 to 9, wherein, The cooling fins (41, 41a, 41b) are arranged in a backward-curved, forward-curved, or radial manner.

11. The laser reflection unit according to any one of claims 1 to 10, wherein, The top side (43) is perforated to form a perforation (46) so that airflow can be directed toward the top side (43) of the wheel (4); and Arrange the motor (5) to make the wheel (4) rotate.

12. The laser reflection unit according to any one of claims 1 to 11, wherein, Pins (24, 38) are formed on the fixed blades (21, 31).

13. The laser reflection unit according to any one of claims 1 to 12, wherein, The fixed blades (21, 31) of the top (2) and the bottom (3) are arranged such that the fixed blades (21, 31) maintain the same configuration when the radial alignment between the top (2) and the bottom (3) changes at a certain angle.

14. The laser reflection unit according to claim 13, wherein, The angle is determined based on the greatest common divisor (GCD) between the number of fixed blades (21) at the top (2) and the number of fixed blades (31) at the bottom (3).

15. The laser reflection unit according to any one of claims 1 to 14, wherein, The cooling fins (41, 41a, 41b) are configured to regulate the pressure and speed of the air circulating within the laser reflection unit.

16. The laser reflecting unit according to any one of claims 1 to 15, wherein, The top (2) has a compartment configured to receive the wheel (4), the compartment being located at the center and surrounded by the fixed blade (21). The diameter of the wheel (4) is smaller than the diameter of the compartment in the top (2).

17. A laser reflection unit (1) for a laser phosphor projector, comprising: The outer casing has a top (2) and a bottom (3) mechanically fastened to the top (2), the top (2) and the bottom (3) respectively having fixing blades (21, 31) forming a spiral channel; as well as A wheel (4), which is disposed within the housing and configured to generate airflow in a direction (D1) tangential to the circumference of the wheel (4), wherein, The wheel (4) has a phosphor layer (45) arranged in a ring on the top side (43) of the wheel (4). The fixed blade (21) of the top (2) forms a compartment to receive the wheel (4); During operation, the airflow generated by the rotating wheel flows within the path formed by the spiral channel; the airflow guided by the channel of the fixed blade (31) at the bottom (3) flows toward the wheel (4).

18. The laser reflection unit (1) according to claim 17, wherein, The fixed blades (31) at the bottom (3) form a multi-armed Archimedean spiral pattern; and / or The fixed blades (21) of the top (2) of the outer casing form a single-arm or multi-arm Archimedean spiral pattern.

19. The laser reflection unit (1) according to claim 17 or 18, wherein, The number of fixed blades (31) at the bottom (3) of the housing is a multiple of the number of fixed blades (21) at the top (2) of the housing.

20. The laser reflecting unit according to any one of claims 17 to 19, wherein, The spiral direction of the fixed blade (31) at the bottom (3) of the outer casing is opposite to the spiral direction of the fixed blade (21) at the top (2) of the outer casing.

21. The laser reflection unit according to any one of claims 17 to 20, wherein, The channel formed by the fixed blades (21, 31) is formed with a uniform width.

22. The laser reflecting unit according to any one of claims 17 to 21, wherein, The cooling fins (41) have a backward curved arrangement, a forward curved arrangement, or a radial arrangement.

23. The laser reflecting unit according to any one of claims 17 to 22, wherein, The bottom (3) further includes a base (33) and an outer edge (34) surrounding the base (33); The top (2) further includes a cover (22) and an outer edge (23) surrounding the cover (22); and The fixing blade (21) of the top (2) is fixed to the cover (22) and the outer edge (23) of the top (2), and the fixing blade (21) of the bottom (3) is fixed to the base (33) and the outer edge (34) of the bottom (3).

24. The laser reflection unit according to claim 23, further comprising: A fluid port (32) located between the base (33) and the cover (35) at the bottom (3) forms a compartment for receiving coolant; A protrusion (33b) is formed on the outer surface (33a) of the base (33) to distribute the coolant throughout the outer surface (33a) and increase the heat exchange surface between the base (33) and the coolant in the compartment.

25. The laser reflection unit according to claim 24, further comprising: A seal (36) is formed to fill the space between the outer surface of the base (33) and the cover (35).

26. The laser reflecting unit according to any one of claims 23 to 25, wherein, The cover (22) and the outer edge (23) form a curved surface configured to guide airflow from the top (2) to the bottom (3) of the outer shell.

27. The laser reflecting unit according to any one of claims 17 to 26, wherein, Pins (24, 38) are formed on the fixed blades (21, 31).

28. The laser reflecting unit according to any one of claims 17 to 27, wherein, The top side (43) is perforated to form a perforation (46), thereby allowing airflow toward the top side (43) of the wheel (4); and Arrange the motor (5) to make the wheel (4) rotate.

29. The laser reflecting unit according to any one of claims 17 to 28, wherein, The fixed blades (21, 31) of the top (2) and the bottom (3) are arranged such that the fixed blades (21, 31) maintain the same configuration when the radial alignment between the top (2) and the bottom (3) changes at a certain angle.

30. The laser reflection unit according to claim 29, wherein, The angle is determined based on the greatest common divisor (GCD) between the number of fixed blades (21) at the top (2) and the number of fixed blades (31) at the bottom (3).

31. The laser reflecting unit according to any one of claims 17 to 30, wherein, The cooling fins (41, 41a, 41b) are configured to regulate the pressure and speed of the air circulating within the laser reflection unit.

32. The laser reflecting unit according to any one of claims 17 to 31, wherein, The top (2) has a compartment configured to receive the wheel (4), the compartment being located at the center and surrounded by the fixed blade (21). The diameter of the wheel (4) is smaller than the diameter of the compartment in the top (2).

33. A method for operating a laser reflecting unit, comprising: Rotate a wheel (4) disposed inside the housing, the wheel (4) having cooling fins (41, 41a, 41b) configured to generate airflow during rotation. The airflow is guided in a direction (D2) toward the outer edge (23) of the top (2) of the housing through at least one channel formed by at least one fixed blade (21) of the top (2); The airflow is guided in the direction (D3) toward the channel formed by the fixed blades (31) at the bottom (3); The airflow is guided in a direction (D4) toward the center of the bottom (3) through a channel formed by the fixed blades (31) of the bottom (3); and The airflow is guided in a direction (D4) from the center of the bottom (3) to the center of the wheel (4); A low pressure is generated between the cooling fins (41, 41a, 41b) to guide the airflow back to the wheel (4).

34. The method according to claim 33, wherein, The airflow generated by the wheel (4) is generated to flow in a direction (D1) tangential to the circumference of the wheel (4).

35. The method according to claim 33 or 34, wherein, The cooling fins (41, 41a, 41b) have a backward-curved arrangement, a forward-curved arrangement, or a radial arrangement.

36. The method according to any one of claims 33 to 35, further comprising: The airflow is directed toward the top side (43) of the wheel (4) through the perforation (46).

37. The method according to any one of claims 33 to 36, further comprising: - The top (2) and the bottom (3) are fastened to form a sealed compartment; -In this case, during fastening, when the radial alignment between the top (2) and the bottom (3) changes at a certain angle, the fixed blades (21, 31) of the top (2) and the bottom (3) maintain the same construction.

38. The method of claim 37, further comprising: The angle is determined based on the greatest common divisor (GCD) between the number of fixed blades (21) at the top (2) and the number of fixed blades (31) at the bottom (3).

39. The method according to any one of claims 33 to 38, wherein, The fixed blades (31) at the bottom (3) form a multi-armed Archimedean spiral pattern; and / or At least one fixed blade (21) of the top (2) of the housing forms a single-arm or multi-arm Archimedean spiral pattern.

40. The method according to any one of claims 33 to 39, wherein, The number of fixed blades (31) at the bottom (3) of the housing is a multiple of the number of at least one fixed blade (21) at the top (2) of the housing.

41. The method according to any one of claims 33 to 40, wherein, The spiral direction of the fixed blade (31) at the bottom (3) of the outer casing is opposite to the spiral direction of the fixed blade (21) at the top (2) of the outer casing.

42. The method according to any one of claims 33 to 41, wherein, The channel formed by the fixed blades (21, 31) is formed with a uniform width.

43. The method according to any one of claims 33 to 42, further comprising: Coolant is provided between the base (33) and the cover (35) of the bottom (3) through fluid ports (32a, 32b); as well as The coolant is agitated by protrusions (33b) formed on the outer surface of the base (33) so that the coolant is distributed throughout the outer surface (33a) and the heat exchange between the base (33) and the coolant in the compartment defined by the base (33) and the cover (35).

44. The method according to any one of claims 33 to 43, wherein, The cooling fins (41, 41a, 41b) are configured to regulate the pressure and speed of the air circulating within the laser reflection unit.

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