Phosphor wheel

Abstract

Provided are: a substrate (11) having a first main surface and a second main surface facing away from each other; a phosphor layer (12) provided on the first main surface; and a heat dissipation member (30E) composed of a plate material, disposed opposite to one of the first main surface and the second main surface, and rotating together with the substrate (11); the heat dissipation member (30E) has: a protruding portion (34) provided in a central portion of the heat dissipation member (30E) in a manner of protruding toward the one surface, having a contact surface in contact with the one surface; a plurality of fins (31) formed by shearing and folding a plurality of regions (32) in a peripheral region other than the central portion; and a bent end portion formed by bending an outer peripheral end portion of the heat dissipation member (30E) toward a direction identical to a direction in which the plurality of fins (31) are sheared and folded when viewed from the heat dissipation member (30E), and having an obtuse bending angle; the protruding portion (34) ensures a certain gap between the substrate (11) and the heat dissipation member (30E), and conducts heat of the substrate (11) to a peripheral region of the heat dissipation member (30E).

Description

Technical Field

[0001] This disclosure relates to fluorophores. Background Technology

[0002] As a light source device for laser projectors and the like, there is a phosphor wheel that emits light by laser light (excitation light) irradiated from a laser source. In order to suppress the degradation caused by the heating of the phosphor layer due to laser irradiation, the phosphor wheel rotates about a rotation axis during the period when the laser irradiates the phosphor layer.

[0003] As a technique to improve the heat dissipation performance of a phosphor wheel, a method is disclosed in which fins (blades) with a blade structure are formed in the gap space between two opposing support members on both sides of the phosphor (see, for example, Patent Document 1). According to Patent Document 1, air, as a coolant, passes through the gap space, thereby promoting the dissipation of heat brought to the phosphor and thus improving the heat dissipation performance of the phosphor wheel.

[0004] Existing technical documents

[0005] Patent documents

[0006] Patent Document 1: Japanese Patent No. 5661947 Summary of the Invention

[0007] The problem that the invention aims to solve

[0008] In recent years, there has been a desire to further improve the heat dissipation performance of phosphor wheels.

[0009] This disclosure provides a phosphor wheel with further improved heat dissipation performance.

[0010] To achieve the above objectives, a phosphor wheel according to the present disclosure comprises: a substrate having a first main surface and a second main surface facing away from each other; a phosphor layer disposed on the first main surface; and a heat dissipation member made of a plate, disposed facing one of the first and second main surfaces, and rotating together with the substrate; the heat dissipation member comprises: a protrusion disposed in the central portion of the heat dissipation member in a manner that protrudes toward the aforementioned surface, having a contact surface that contacts the aforementioned surface; a plurality of fins formed by cutting and folding up a plurality of areas in the peripheral region other than the aforementioned central portion; and a bent end formed by bending the outer peripheral end of the heat dissipation member in the same direction as the direction in which the plurality of fins are cut and folded when viewed from the heat dissipation member, and the bent end having an obtuse bending angle; the protrusion contacts the substrate via the contact surface, thereby ensuring a certain distance between the substrate and the heat dissipation member, and conducting heat from the substrate to the peripheral region of the heat dissipation member.

[0011] Invention Effects

[0012] The heat dissipation performance of the phosphor wheel disclosed herein is further improved. Attached Figure Description

[0013] Figure 1 This is an exploded perspective view of the fluorescent wheel in Embodiment 1.

[0014] Figure 2 This is a side view of the phosphor wheel in Embodiment 1.

[0015] Figure 3 This is a front view of the substrate of Embodiment 1 as viewed from the first main surface side.

[0016] Figure 4 It means Figure 2 An enlarged side view of the heat dissipation component shown.

[0017] Figure 5 This is a front view of the heat dissipation component of Embodiment 1 as viewed from the first main surface side.

[0018] Figure 6 This is a perspective view of the heat dissipation component of Embodiment 1 as viewed from the first main surface side.

[0019] Figure 7 This is an exploded perspective view of another form of the fluorescent wheel according to Embodiment 1.

[0020] Figure 8 This is a frontal perspective view of the heat dissipation component of Embodiment 2, viewed from the first main surface side.

[0021] Figure 9 This is a rear perspective view of the heat dissipation component of Embodiment 2, viewed from the second main surface side.

[0022] Figure 10 yes Figure 9 A partially enlarged view of the heat dissipation components.

[0023] Figure 11 This is a diagram showing the analytical results of the fluid flow near the fins of the heat dissipation component in Embodiment 2.

[0024] Figure 12 This is a frontal perspective view of the heat dissipation component of the modified embodiment 2, viewed from the first main surface side.

[0025] Figure 13 This is a frontal perspective view of the heat dissipation component of the comparative example as viewed from the first main surface side.

[0026] Figure 14 This is a graph showing the analytical results of the fluid flow near the fins of the heat dissipation component in the comparative example.

[0027] Figure 15 This is a frontal perspective view of the heat dissipation component of Embodiment 3 as viewed from the first main surface side.

[0028] Figure 16 yes Figure 15 A partially enlarged view of the heat dissipation components.

[0029] Figure 17 This is a graph showing the verification results of a prototype of the fluorescent wheel according to Embodiment 3.

[0030] Figure 18 This is a graph showing the analytical results of the fluid flow near the fins of the heat dissipation component in the comparative example.

[0031] Figure 19 This is a diagram showing the analytical results of the fluid flow near the fins of the heat dissipation component in Embodiment 3.

[0032] Figure 20A This is a diagram showing another example of the dimensions of the notch in embodiment 3.

[0033] Figure 20B This is a diagram showing another example of the dimensions of the notch in embodiment 3.

[0034] Figure 21A This is a diagram showing another example of the shape of the notch in a modified embodiment 3.

[0035] Figure 21B This is a diagram showing another example of the shape of the notch in a modified embodiment 3.

[0036] Figure 22A This is a diagram showing an example of a variation of embodiment 3 in which the notch is formed near the rotation axis of the heat dissipation component.

[0037] Figure 22B This is a diagram illustrating an example where the notch in a modified embodiment 3 is formed near the outer periphery of the heat dissipation component.

[0038] Figure 23 This is a graph showing the analytical results of the temperature reduction effect of the phosphor layer of the phosphor wheel in Embodiment 3.

[0039] Figure 24 This is a diagram showing the analytical results of fluid flow near the fins of a heat dissipation component with a notch formed near the axis of rotation.

[0040] Figure 25 This is a frontal perspective view of the heat dissipation component of Embodiment 4 as viewed from the first main surface side.

[0041] Figure 26 It means Figure 25 An enlarged side view of the heat dissipation components and a portion of the substrate.

[0042] Figure 27 It means Figure 26 A magnified 3D view of a portion near the curved end shown.

[0043] Figure 28 It means and Figure 26 The enlarged perspective view of the area near the curved end with different dimensions is shown.

[0044] Figure 29 This is a graph showing the verification results of a prototype of the fluorescent wheel according to Embodiment 4.

[0045] Figure 30A This is a graph showing the analytical results of the relative velocity near the outer peripheral end of the heat dissipation component in the comparative example.

[0046] Figure 30B This is a graph showing the analytical results of the relative velocity of the fluid near the curved end of the heat dissipation component in Embodiment 4.

[0047] Figure 31 This is a partially enlarged side view showing the heat dissipation component and substrate with curved ends in relation to Modified Example 1.

[0048] Figure 32 It means Figure 31 An enlarged perspective view of the area near the curved end shown.

[0049] Figure 33 Is with Figure 32 The image shows a magnified perspective view of the area near the curved end of different sizes.

[0050] Figure 34 This is a graph showing the analytical results of the temperature reduction effect of the phosphor layer of the phosphor wheel in Embodiment 4.

[0051] Figure 35 yes Figure 34 Contour diagram of the time derivative of the square mean pressure (RMS pressure) of the comparative example.

[0052] Figure 36 yes Figure 34 A contour map of the time derivative of the squared average pressure of “R1*1”.

[0053] Figure 37 yes Figure 34 A contour map of the time derivative of the square mean pressure of “C1.5*1”.

[0054] Figure 38 This is a partially enlarged side view of the heat dissipation component and substrate with curved ends in relation to Modified Example 2.

[0055] Figure 39 express Figure 38 An enlarged perspective view of the area near the curved end shown.

[0056] Figure 40 Is with Figure 39 The image shows a magnified perspective view of the area near the different curved ends. Detailed Implementation

[0057] Hereinafter, embodiments of the present disclosure will be described with reference to the accompanying drawings. The embodiments described below are all preferred examples of the present disclosure. Therefore, the numerical values, shapes, materials, constituent elements, arrangement positions of constituent elements, and connection methods shown in the following embodiments are examples and not intended to limit the scope of the present disclosure. Therefore, constituent elements not described in the independent claims representing the highest concept of the present disclosure in the constituent elements of the following embodiments are described as arbitrary constituent elements.

[0058] Furthermore, the figures are schematic diagrams, not rigorous illustrations. Additionally, substantially identical structures are given the same symbols across the figures, and repetitive explanations are omitted or simplified.

[0059] Furthermore, in the accompanying drawings used in the following description of the embodiments, coordinate axes are sometimes shown. The Z-axis direction is explained as the height direction of the phosphor wheel. Sometimes the Z-axis+ side is shown as the upper side (above), and the Z-axis- side is shown as the lower side (below). Furthermore, the X-axis and Y-axis directions are mutually orthogonal directions on a plane perpendicular to the Z-axis direction. In the following embodiments, the front view refers to the view viewed from the X-axis+ side, and the rear view refers to the view viewed from the X-axis- side. Furthermore, the side view refers to the view viewed from the Y-axis direction.

[0060] (Implementation Method 1)

[0061] [Fluorescent wheel 1]

[0062] The following uses Figure 1 and Figure 2 The structure of the phosphor wheel 1 in Embodiment 1 will be described. Figure 1 This is an exploded perspective view of the phosphor wheel 1 of Embodiment 1. Figure 2 This is a side view of the phosphor wheel 1 according to Embodiment 1.

[0063] The phosphor wheel 1 in Embodiment 1 is a reflective phosphor wheel, used in laser projectors, lighting devices facing equipment, and light sources for endoscopes, etc. Figure 1 and Figure 2 As shown, the phosphor wheel 1 includes a substrate 11, a phosphor layer 12 disposed on the substrate 11, a heat dissipation component 30, a motor 40, and an adjustment plate 41. The adjustment plate 41 is used to adjust the center of gravity deviation during rotation in order to transmit the rotational power of the motor 40 to the substrate 11 and the like in a balanced manner, but it is not a necessary structure. The adjustment plate 41 can also be the hub of the motor 40.

[0064] [Substrate 11]

[0065] Figure 3 This is a front view of the substrate 11 of Embodiment 1 as viewed from the first main surface side.

[0066] The substrate 11 has a first main surface and a second main surface facing away from each other, and is a disc-shaped plate material driven to rotate by the motor 40 around the rotation axis J. In other words, the shape of the substrate 11 in the plan view is circular. In addition, the shape in the plan view is the shape when viewed from a direction perpendicular to the substrate 11 (X-axis + side) (i.e., the front shape). The diameter of the substrate 11 is, for example, about 8 cm, but is not particularly limited.

[0067] like Figure 3 As shown, a phosphor layer 12 is provided on the first main surface of the substrate 11. An opening 13 is provided at the center of the substrate 11 to allow a portion (hub, rotor, etc.) of the motor 40 connected to the adjustment plate 41 to protrude. Furthermore, the rotation axis J passes through the center (center position) of the substrate 11, and the substrate 11 is driven to rotate by the motor 40 around the rotation axis J.

[0068] The material of the substrate 11 can be any metal with good thermal conductivity, such as aluminum, stainless steel, or sapphire, and is not particularly limited. In this embodiment, the substrate 11 is formed of aluminum, for example. This is because aluminum has relatively high thermal conductivity and is lightweight, so by forming the substrate 11 with aluminum, not only can heat dissipation performance be improved, but also weight reduction can be achieved. In addition, the thickness of the substrate 11 is, for example, 1.5 mm or less.

[0069] [Fluorescent layer 12]

[0070] The phosphor layer 12 is disposed on the first main surface of the substrate 11.

[0071] Here, the phosphor layer 12 may, for example, be composed of a resin material containing multiple yellow phosphor particles of the YAG class. In this case, the substrate of the resin material is, for example, a silicone resin that is transparent and thermosetting. The phosphor layer 12 can be formed by curing the resin material in a heating oven after screen printing it onto the first main surface of the substrate 11.

[0072] Furthermore, the phosphor layer 12 may, for example, be composed of YAG-type yellow phosphor particles and a binder. In this case, to improve light conversion efficiency, it is preferable that the amount of YAG-type yellow phosphor particles contributing to the conversion from excitation light to fluorescence is relatively large in the phosphor layer 12. That is, it is preferable that the phosphor particle content ratio is relatively high in the phosphor layer 12. The binder is a mixture other than the yellow phosphor particles constituting the phosphor layer 12. The binder is formed, for example, from an inorganic material with high thermal conductivity such as alumina. The thermal conductivity of alumina is more than 10 times that of silicone resin. Therefore, by composing yellow phosphor particles and a binder formed of alumina, high thermal conductivity can be achieved in the phosphor layer 12.

[0073] In addition, although Figures 1-3 Although not illustrated, a reflective film can also be provided between the first main surface of the substrate 11 and the phosphor layer 12.

[0074] In this embodiment, such as Figure 3 As shown, the phosphor layer 12 is configured as a ring-shaped band along the circumferential direction θ of the disk-shaped substrate 11 in a planar view. More specifically, the phosphor layer 12 is arranged in a ring shape on a circumference equidistant from the rotation axis J, which serves as the rotation center of the phosphor wheel 1. In other words, the width of the phosphor layer 12 in the radial direction r is constant. Furthermore, the phosphor layer 12 is preferably disposed at the periphery of the first main surface. In addition, if the substrate 11 is not a disk-shaped substrate, it is also preferable to set the phosphor layer 12 in a ring shape.

[0075] Furthermore, the phosphor layer 12 emits light when irradiated by the laser. To prevent the laser from concentrating on a single point in the phosphor layer 12, the phosphor wheel 1 is rotated around the rotation axis J by the motor 40 during the irradiation of the phosphor layer 12. This suppresses the degradation of the phosphor particles contained in the phosphor layer 12 caused by the heat generated by the laser irradiation.

[0076] [Heat dissipation component 30]

[0077] The heat dissipation component 30 is made of a plate and is disposed facing one of the first and second main surfaces of the substrate 11, and rotates together with the substrate 11. Figure 1 and Figure 2 In the example shown, the heat dissipation component 30 is disposed opposite to the second main surface of the substrate 11. Here, a phosphor layer 12 is provided on the first main surface of the substrate 11.

[0078] Figure 4 yes Figure 2 An enlarged side view of the heat dissipation component 30 shown. Figure 5This is a front view of the heat dissipation component 30 of Embodiment 1 as viewed from the first main surface side. Figure 6 This is a perspective view of the heat dissipation member 30 of Embodiment 1 as viewed from the first main surface side. In addition, as described above, the back side is the side of the heat dissipation member 30 as viewed from the side opposite to the surface (front side) opposite to the second main surface of the substrate 11 and in a direction perpendicular to the heat dissipation member 30 (i.e., the X-axis side).

[0079] The heat dissipation component 30 is a disc-shaped plate that is driven to rotate by the motor 40 around the rotation axis J. In other words, the shape of the heat dissipation component 30 in its plan view is circular. Furthermore, the diameter of the heat dissipation component 30 is, for example, about 7 cm, but it can also be about 3 cm to 100 cm. Additionally, the diameter of the heat dissipation component 30 is not particularly limited, as long as it is smaller than the inner diameter of the phosphor layer 12 when the heat dissipation component 30 and the first main surface of the substrate 11 are arranged facing each other, as described later. In other words, when the heat dissipation component 30 and the first main surface of the substrate 11 are arranged facing each other, the diameter of the heat dissipation component 30 only needs to be smaller than the inner diameter of the phosphor layer 12, which is arranged in a strip and annular shape on one side of the substrate 11. On the other hand, the diameter of the heat dissipation component 30 is as follows... Figure 1 As shown, when the heat dissipation component 30 is arranged facing the second main surface of the substrate 11, it can be larger than the inner diameter of the phosphor layer 12 or the diameter of the substrate 11.

[0080] In this embodiment, the heat dissipation component 30 is as follows: Figure 1 , Figure 2 , Figures 4-6 As shown, it has multiple fins 31 and protrusions 34. For example, as Figure 1 and Figure 2 As shown, in this embodiment, the heat dissipation component 30 is disposed facing the second main surface of the substrate 11. Furthermore, a plurality of fins 31 are sheared and folded toward the second main surface of the substrate 11, and protrusions 34 also protrude toward the second main surface of the substrate 11. More specifically, the plurality of fins 31 are formed by shearing and folding together a plurality of regions 32, which are multiple part regions, of the material of the heat dissipation component 30. The plurality of regions 32 become through holes after the plurality of fins 31 are formed. Details of the protrusions 34, the plurality of fins 31, and the regions 32 will be described later.

[0081] The material of the heat dissipation component 30 can be any sheet metal such as stainless steel, iron, copper, sapphire or aluminum, but is not particularly limited.

[0082] <Prominent Part 34>

[0083] The protrusion 34 is provided in the central part of the heat dissipation member 30 such that it protrudes toward one of the first main surfaces and the second main surfaces of the substrate 11, and has a contact surface that contacts the one of the surfaces. The protrusion 34 contacts the substrate 11 via the contact surface, thereby ensuring a certain distance between the substrate 11 and the heat dissipation member 30, and conducting the heat of the substrate 11 to the peripheral area of ​​the heat dissipation member 30 other than the central part.

[0084] In this embodiment, the protrusion 34 is, for example, as shown in the example... Figure 2 As shown, in order to maintain a constant distance between the substrate 11 and the heat dissipation component 30, the protrusion 34 is provided in the center of the heat dissipation component 30 in a manner that protrudes toward the second main surface of the substrate 11. The protrusion 34 is formed by a deep drawing process.

[0085] The thickness of the protrusion 34, i.e. the distance between the substrate 11 and the heat dissipation component 30, is as follows: Figure 2 and Figure 4 As shown, any fin 31 formed by cutting and folding up the peripheral area of ​​the heat dissipation component 30 (described later) is sufficient. The protrusion 34 is, for example, as shown... Figure 5 and Figure 6 As shown, it has a contact surface for contacting the second main surface of the substrate 11, and the contact surface is strip-shaped and annular.

[0086] Furthermore, an opening 33 is provided in the center of the protrusion 34, which is connected to the motor 40 via the adjustment plate 41. Thus, the rotation shaft J passes through the center (central position) of the heat dissipation component 30, and the heat dissipation component 30 and the base plate 11 are driven to rotate by the motor 40 around the rotation shaft J. The size (diameter) of the opening 33 is only required to allow a portion of the motor 40 connected to the adjustment plate 41 to protrude. For example, the opening 33 only needs to have a maximum gap of 1 mm with a portion of the motor 40.

[0087] Furthermore, the diameter of the protrusion 34 is, for example, about 3.7 cm, but is not limited to this. The diameter of the protrusion 34 is only required to be smaller than the inner diameter of the heat dissipation component 30 and larger than the diameter of the opening 33, and there are no particular limitations.

[0088] Thus, protrusion 34, as Figure 1 , Figure 2 , Figures 4-6 As shown, the protrusion 34 is provided in the center of the heat dissipation component 30 in a strip-shaped and annular contact surface. Thus, the protrusion 34 not only functions as a pad that can form a certain gap (space) of air between the substrate 11 and the peripheral area of ​​the heat dissipation component 30, but also functions as a heat conduction path that can transfer the heat generated by the phosphor layer 12 from the substrate 11 to the peripheral area of ​​the heat dissipation component 30.

[0089] <Fin 31>

[0090] Multiple fins 31 are formed by shearing and folding. More specifically, the multiple fins 31 are formed by shearing and folding multiple regions 32 in the peripheral region of the plate of the heat dissipation component 30, excluding the central portion. The multiple fins 31 are sheared and folded towards a certain surface of the first main surface and the second main surface of the substrate 11, respectively. In this embodiment, for example, as shown... Figures 1-3 As shown, multiple fins 31 are erected facing the second main surface of the substrate 11 by cutting and folding multiple regions 32 toward the second main surface of the substrate 11.

[0091] In addition, the height of multiple fins 31 is as follows Figure 2 and Figure 4 As shown, it is thinner than the protrusion 34.

[0092] In addition, Figure 1 and Figure 2 In the example shown, fins 31 are formed in the peripheral region of the heat dissipation member 30, which corresponds to the region inner of the phosphor layer 12, but this is not a limitation. When the heat dissipation member 30 is disposed facing the first main surface of the substrate 11, and the diameter of the heat dissipation member 30 is larger than the inner diameter of the phosphor layer 12, fins 31 may also be formed in the peripheral region including the region of the heat dissipation member 30 corresponding to the region of the phosphor layer 12. Furthermore, when the heat dissipation member 30 is disposed facing the first main surface of the substrate 11, and the diameter of the heat dissipation member 30 is larger than the outer diameter of the phosphor layer 12, fins 31 may also be formed in the peripheral region including the region of the heat dissipation member 30, which corresponds to the region outer of the outer diameter of the phosphor layer 12.

[0093] For example, Figure 5 and Figure 6 As shown, multiple fins 31 are arranged in a circular pattern along the circumferential direction θ in the peripheral region of the heat dissipation component 30 at a certain distance from the center (rotation axis J). The shape of the multiple fins 31 is, for example, roughly rectangular (roughly trapezoidal), but it is also possible that the corners at the front end are rounded off. In other words, as... Figure 5 and Figure 6 As shown in the example, the multiple fins 31 are each formed at a certain angle relative to the radial direction r in the peripheral region, and are sheared and folded up at a certain angle relative to the second main surface of the substrate 11 (or the front surface of the heat dissipation component). Alternatively, the multiple fins 31 can be formed in the peripheral region, or they can be formed outside the radial direction r. Furthermore, each of the multiple fins 31 may not be vertically erected relative to the second main surface of the substrate 11 (or the front surface of the heat dissipation component 30).

[0094] Furthermore, in this embodiment, each of the multiple fins 31, centered on the rotation axis J, directs airflow outward (in the centrifugal direction) in accordance with the rotation of the heat dissipation component 30. In other words, each of the multiple fins 31 transports air (fluid) located on the back side (X-axis side) of the heat dissipation component 30 through multiple regions 32, which serve as through holes, toward the outside of the space between the substrate 11 and the heat dissipation component 30. Thus, the airflow generated by the multiple fins 31 can be used for cooling the phosphor layer 12.

[0095] Furthermore, the angles of fin 31 relative to the radial direction r and the angles of fin 31 relative to the second main surface are not limited to any specific angles, as long as they effectively direct airflow outwards. Figures 4-6 The example shown.

[0096] <Area 32>

[0097] As described above, region 32 is a portion of the plate material of the heat dissipation component 30, which becomes a through hole after the formation of multiple fins 31.

[0098] More specifically, multiple areas 32 are located in the surrounding areas. Furthermore, such as... Figure 5 As shown, when viewed from the direction of the substrate 11 toward the heat dissipation member 30 (viewed from the first main surface), the plurality of regions 32 are located at positions that are approximately equidistant in the circumferential direction θ from a predetermined distance from the center of the heat dissipation member 30, along an imaginary straight line having an angle of more than a predetermined angle with the radial direction r. The plurality of regions 32 may also have similar shapes, but are not limited to similar shapes.

[0099] In addition, such as Figure 5 and Figure 6 As shown, multiple regions 32 are through holes through which the heat dissipation component 30 passes, functioning as ventilation holes through which the air generated by the multiple fins 31 passes. For example, Figure 5 As shown, multiple regions 32 are located in a circular pattern along the circumferential direction θ at a certain distance from the center (rotation axis J) of the heat sink 30 in the surrounding region. Furthermore, if the multiple regions 32 are randomly arranged, the rotation of the heat sink 30 becomes unstable, leading to abnormal noises, etc. Therefore, the multiple regions 32 are arranged at approximately equal intervals. The shape of the multiple regions 32 is, for example, approximately rectangular (approximately trapezoidal), but the corners can also be rounded.

[0100] In addition, such as Figure 5 As shown, multiple regions 32 are each formed at a certain angle relative to the radial direction r. Alternatively, each of the multiple regions 32 may not be formed along the radial direction r. The size of the angle between the multiple regions 32 and the radial direction r is only required to ensure that the multiple sheared and folded fins 31 can effectively deliver air outwards, and is not limited to... Figure 5 The example shown.

[0101] [Motor 40]

[0102] Motor 40, for example Figure 1 As shown, the drive base plate 11 and heat dissipation component 30 are rotated by electronic circuitry (not shown). The motor 40 is, for example, an external rotor type motor, but is not particularly limited thereto.

[0103] [Effects, etc.]

[0104] As described above, the phosphor wheel 1 of this embodiment includes: a substrate 11 having a first main surface and a second main surface facing away from each other; a phosphor layer 12 disposed on the first main surface; and a heat dissipation member 30, which is made of a plate and is disposed opposite to the second main surface of the substrate 11, and rotates together with the substrate 11. The heat dissipation member 30 has: a protrusion disposed in the central portion of the heat dissipation member 30 protruding toward the second main surface and having a contact surface that contacts the second main surface; and a plurality of fins formed by cutting and folding a plurality of areas in the peripheral area other than the central portion. The protrusion 34 contacts the substrate 11 via the contact surface, thereby ensuring a certain distance between the substrate 11 and the heat dissipation member 30, and conducting heat from the substrate 11 to the peripheral area of ​​the heat dissipation member 30.

[0105] Thus, the phosphor wheel 1 of this embodiment is a reflective phosphor wheel, with the phosphor layer 12 only present on the first main surface of the substrate 11. Furthermore, the phosphor wheel 1 includes a heat dissipation member 30 with protrusions 34, thereby creating a space with a certain interval between the substrate 11 and the heat dissipation member 30. This allows airflow generated by the multiple fins 31 to pass through multiple regions 32 (through holes) and be transported towards the outside of the space between the substrate 11 and the heat dissipation member 30. In other words, the airflow generated by the multiple fins 31 can be used for cooling the phosphor layer 12. This improves the heat dissipation performance of the phosphor wheel 1. Furthermore, since the phosphor wheel 1 contacts the protrusions 34 through the substrate 11, a heat-conducting path can be formed to transfer heat generated by the phosphor layer 12 from the substrate 11 to the peripheral area of ​​the heat dissipation member 30, further improving heat dissipation performance.

[0106] As shown above, the phosphor wheel 1 can achieve further improvement in heat dissipation performance.

[0107] Furthermore, since the multiple fins formed on the heat dissipation component 30 are formed by cutting and folding multiple areas of the plate, they can be formed simply, thus reducing costs compared to manufacturing by cutting.

[0108] Furthermore, it has been explained that the size of the opening 33 located in the center of the heat dissipation component 30 is only required to allow a portion of the motor 40, which is connected to the adjustment plate 41, to protrude, but is not limited to this. The size of the opening 33 may also be increased for ventilation. That is, the heat dissipation component 30 may also have an opening 33 formed in the center of the heat dissipation component 30 for ventilation, and the rotation axis J of the heat dissipation component 30, which rotates together with the substrate 11, passes through the opening 33.

[0109] Therefore, the air generated by the multiple fins 31 can be transported not only through the multiple regions 32 (through holes) but also through the openings 33 towards the outside of the space (gap) between the substrate 11 and the heat dissipation component 30. As a result, the airflow through the space between the substrate 11 and the heat dissipation component 30 that can be used for cooling the phosphor layer 12 can be increased, thus further improving the heat dissipation performance of the phosphor wheel 1.

[0110] In addition, the structure of the phosphor wheel 1 is not limited to the above-described form. In order to further improve the heat dissipation performance, fins may be formed on the substrate 11, or an opening as a through hole may be formed on the substrate 11.

[0111] Furthermore, in the above-described embodiment 1, as in Figure 1 and Figure 2 The example shown assumes that the heat dissipation component 30 constituting the phosphor wheel 1 is arranged facing the second main surface of the substrate 11, but is not limited thereto. Figure 7 This is an exploded perspective view of the phosphor ring 1A, another embodiment of Embodiment 1. That is, it can also be as shown... Figure 7 The phosphor wheel 1A shown has a heat dissipation component 30 and a first main surface of the substrate 11 on which the phosphor layer 12 is provided, facing each other. In this case, it is sufficient to simply cut and fold the plurality of fins 31 toward the first main surface of the substrate 11, and form the protrusion 34 so that it also protrudes toward the first main surface of the substrate 11. Furthermore, in this case, the heat dissipation component 30 may not have the protrusion 34, and the adjustment plate 41 may also have the function of the protrusion 34. In addition, the heat dissipation component 30 and the adjustment plate 41 that also has the function of the protrusion 34 may be integrated. As a result, the number of parts can be further reduced, and cost reduction can be achieved.

[0112] (Implementation Method 2)

[0113] In Embodiment 1 described above, a phosphor wheel 1 with improved heat dissipation performance was explained, but the embodiment is not limited to the above-described form. To further improve heat dissipation performance, through holes may be further formed in the protrusions of the heat dissipation components provided in the phosphor wheel 1. This type of heat dissipation component is described below as Embodiment 2. Hereinafter, the description will focus on the differences from the heat dissipation component 30 described in Embodiment 1.

[0114] [Heat dissipation component 30B]

[0115] Figure 8 This is a frontal perspective view of the heat dissipation component 30B of Embodiment 2, viewed from the first main surface side. Figure 9 This is a rear perspective view of the heat dissipation component 30B of Embodiment 2, viewed from the second main surface side. Figure 10 yes Figure 9 A partially enlarged view of the heat dissipation component 30B. Additionally, regarding... Figure 5 and Figure 6 The same elements are assigned the same symbols, and detailed explanations are omitted.

[0116] Figure 8 and Figure 9 The heat dissipation component 30B shown is relative to Figure 5 and Figure 6 The heat dissipation component 30 shown is different in that it also has a through hole 35B formed on the protrusion 34B.

[0117] <Prominent part 34B>

[0118] Similar to Embodiment 1, the protrusion 34B is provided in the central portion of the heat dissipation member 30B such that it protrudes toward one of the first and second main surfaces of the substrate 11. Furthermore, the protrusion 34B has a contact surface 341 that contacts the certain surface, and a peripheral wall 342 with the contact surface 341 as its bottom surface.

[0119] Similar to Embodiment 1, the protrusion 34B is provided in the center of the heat dissipation member 30B in order to maintain a constant distance between the substrate 11 and the heat dissipation member 30B. The protrusion 34B is formed by deep drawing. Furthermore, the opening 33 in the center of the protrusion 34B and the diameter of the protrusion 34B are as described in Embodiment 1, and therefore are omitted here.

[0120] Thus, similar to Embodiment 1, the protrusion 34B functions as a pad that can form a space (space) of air gaps between the substrate 11 and the peripheral area of ​​the heat dissipation member 30B. Furthermore, the protrusion 34B contacts the substrate 11 via the contact surface 341, thereby functioning as a heat conduction path that can conduct heat generated by the phosphor layer 12 from the substrate 11 to the peripheral area of ​​the heat dissipation member 30B.

[0121] In this embodiment, the protrusion 34B also has a plurality of through holes 35B formed on the peripheral wall 342 for ventilation.

[0122] <Through Hole 35B>

[0123] A through hole 35B is provided on the peripheral wall 342 of the protrusion 34B. More specifically, the multiple through holes 35B are respectively as follows: Figures 8-10 As shown, it is formed at the boundary between the peripheral wall 342 and the contact surface 341. That is, multiple through holes 35B are formed across the peripheral wall 342 and the contact surface 341 respectively.

[0124] Furthermore, the multiple through holes 35B are formed at positions different from those connecting the rotation axis J of the heat dissipation component 30B and the respective regions of the multiple fins 31. That is, the through holes 35B and the fins 31 are formed in a manner that they are not arranged in the radial direction r.

[0125] Here, using Figure 10 The dimensional concept of the through hole 35B is explained. Assuming that the outer diameter of the heat dissipation component 30B is, for example, φ70mm~80mm, and the radial length (length in the long strip direction) of the region 32 is about 11mm~14mm, the outer diameter of the contact surface 341 is about φ35mm~38mm, and the diameter of the through hole 35B is about φ3mm.

[0126] [Effects, etc.]

[0127] As explained above, in the phosphor wheels 1 and 1A of this embodiment, a through hole 35B is formed at the boundary between the heat dissipation component 30B and the protrusion 34B, spanning the peripheral wall 342 and the contact surface 341 of the protrusion 34B.

[0128] This structure further promotes the flow of fluid (air) between the phosphor layer 12 and the heat dissipation component 30B. This, in turn, further reduces the temperature of the phosphor layer 12, thus improving the heat dissipation performance of the phosphor wheels 1 and 1A.

[0129] Here, since a prototype of the phosphor wheels 1 and 1A of this embodiment, configured as described above, was fabricated and the temperature rise of the phosphor layer 12 during its operation for a specified time was verified, the verification results are explained. Additionally, as a comparative example, verification was also performed on a prototype of the phosphor wheels 1 and 1A of Embodiment 1 that does not have the through hole 35B.

[0130] As a result, in this embodiment, the temperature rise of the phosphor layer 12 was verified to be 115.7°C. In the comparative example, the temperature rise of the phosphor layer 12 was verified to be 119.5°C. That is, it can be confirmed that the temperature rise of the phosphor layer 12 in this embodiment is lower than the temperature rise of the phosphor layer 12 in the comparative example.

[0131] Figure 11 This is a diagram showing the analytical results of the fluid flow near the fins 31 of the heat dissipation component 30B in Embodiment 2. Figure 11 In the diagram, streamlines are used to represent the flow of fluid (air) through the through-hole 35B towards the vicinity of the fin 31. Additionally, Figure 11 The streamlines shown represent the flow of fluid (air) using vectors.

[0132] As described above, the fin 31 has the following function: to enclose the area (for example, refer to the area between the planar portion of the heat dissipation member 30, 30B on which the fin 31 is provided and the substrate 11) Figure 1 and Figure 7 The fluid (air) present in the heat sink is pushed outward toward the outer periphery of the heat dissipation components 30 and 30B. Through this function, heat conduction due to convection is promoted in the phosphor wheels 1 and 1A of embodiments 1 and 2, so that the temperature of the phosphor layer 12 provided on the substrate 11 can be reduced.

[0133] In this embodiment, further, as Figure 11 As shown, by providing a through hole 35B in the heat dissipation component 30B, fluid (air) passing through the through hole 35B and moving towards the outer periphery of the heat dissipation component 30B is blown onto the fins 31 midway. Thus, with respect to Embodiment 2, the phosphor wheels 1 and 1A, by providing a through hole 35B in the heat dissipation component 30B, can be expected to promote heat transfer by convection and improve heat dissipation compared to the case where the through hole 35B is not provided (the phosphor wheels 1 and 1A do not have a through hole 35B).

[0134] (Modified Example)

[0135] In the above-described embodiment 2, a through hole 35B is formed at the boundary between the heat dissipation component 30B and the protrusion 34B, spanning the peripheral wall 342 of the protrusion 34B and the contact surface 341. However, this embodiment is not limited to this. Figure 12 As shown, a through hole 35C may also be formed only on the peripheral wall 342 of the protrusion 34B.

[0136] Figure 12 This is a front perspective view of the heat dissipation component 30C of the modified embodiment 2, viewed from the first main surface side. Additionally, regarding... Figure 8 and Figure 9 The same elements are assigned the same symbols, and detailed explanations are omitted.

[0137] Figure 12 The heat dissipation component 30C shown is relative to Figure 8 and Figure 9 The heat dissipation component 30B shown differs in the position of the multiple through holes 35C formed in the protrusion 34C for ventilation. The other through holes 35B are the same as those described above.

[0138] More specifically, the through hole 35C is provided on the peripheral wall 342 of the protrusion 34C. The multiple through holes 35C are respectively as follows: Figure 12 As shown, multiple through holes 35C are formed only on the peripheral wall 342, and when viewed from the direction of the heat dissipation component 30C toward the contact surface 341, each through hole 35C is formed at the center of the peripheral wall 342. Furthermore, similar to each of the multiple through holes 35B, the multiple through holes 35C are formed at positions different from the regions connecting the rotation axis J of the heat dissipation component 30C and each of the multiple fins 31. That is, the through holes 35C and the fins 31 are formed in a manner where they are not arranged radially r.

[0139] This structure further promotes the flow of fluid (air) between the phosphor layer 12 and the heat dissipation component 30C. This, in turn, further reduces the temperature of the phosphor layer 12, thus improving the heat dissipation performance of the phosphor wheels 1 and 1A.

[0140] Furthermore, the through-hole formed in the protrusion 34C at the boundary between the peripheral wall 342 and the planar portion of the heat dissipation member 30C on which the fins 31 are provided, and the form spanning the peripheral wall 342 and the planar portion of the heat dissipation member 30C on which the fins 31 are provided, is not included in the scope of Embodiment 2. This is because it cannot promote the flow of fluid (air) generated between the phosphor layer 12 and the heat dissipation member 30C. Hereinafter, it will be briefly described as a comparative example.

[0141] Figure 13 This is a frontal perspective view of the heat dissipation component 90 of the comparative example, viewed from the first main surface side. Additionally, regarding the... Figure 12 The same elements are assigned the same symbols, and detailed explanations are omitted. Figure 14 This is a graph showing the analytical results of the fluid flow near the fins 31 of the heat dissipation component 90 in the comparative example. Figure 14 The text also uses streamlines to represent the flow of fluid (air) through the through hole 95 toward the fin 31.

[0142] like Figure 13 As shown, the heat dissipation component 90 of the comparative example is relative to... Figure 8 and Figure 9 The heat dissipation component 30B shown is and Figure 12 The heat dissipation component 30C shown differs in the position of the through hole 95 in the protrusion 34. More specifically, the through hole 95 in the protrusion 34 is located as follows: Figure 13 As shown, the protrusion 34 is formed at the boundary between the peripheral wall 342 and the planar portion of the heat dissipation member 90 on which the fins 31 are provided, and is formed across the peripheral wall 342 and the planar portion of the heat dissipation member 90 on which the fins 31 are provided.

[0143] exist Figure 13In the heat dissipation component 90 shown with through holes 95, such as Figure 14 As shown, the fluid (air) that passes through the through-hole 95 and is blown towards the outer periphery onto the fins 31 and then discharged towards the outer periphery of the heat dissipation component 90 has a smaller streamline. On the other hand, the fluid (air) that does not blow onto the fins 31 but is discharged at a location closer to the rotation axis J than the fins 31 has a larger streamline. Therefore, compared with Figure 8 Compared to the heat dissipation component 30B (30C) with through hole 35B (through hole 35C) shown, it cannot promote the flow of fluid (air) generated between phosphor layer 12 and heat dissipation component 90, and cannot promote heat transfer by convection.

[0144] (Implementation Method 3)

[0145] In the above-described embodiments 1 and 2, the phosphor wheel 1 and the like with improved heat dissipation performance were described, but the embodiments are not limited to the above-described form. In order to further improve the heat dissipation performance, a notch may be further formed in region 32 to increase the area of ​​region 32 of the heat dissipation member 30 of the phosphor wheel 1 in which the plurality of fins 31 are cut and folded. This case is described below as embodiment 3. Hereinafter, the description will focus on the points that are different from the heat dissipation member 30 described in embodiment 1.

[0146] [Heat Dissipation Component 30D]

[0147] Figure 15 This is a frontal perspective view of the heat dissipation component 30D of Embodiment 3, viewed from the first main surface side. Figure 16 yes Figure 15 A partially enlarged view of the heat dissipation component (30D). Additionally, regarding... Figure 5 and Figure 6 The same elements are assigned the same symbols, and detailed explanations are omitted.

[0148] Figure 15 and Figure 16 The heat dissipation component 30D shown is relative to Figure 5 and Figure 6 The heat dissipation component 30 shown is different in that it also has a notch 321 formed in region 32D.

[0149] <Area 32D>

[0150] Region 32D, similar to Embodiment 1, is a portion of the plate material of the heat dissipation component 30D, becoming a through-hole after the formation of multiple fins 31. Furthermore, multiple regions 32D, as... Figure 15 As shown, the ventilation holes function as air vents through which the air generated by the multiple fins 31 passes. The position and shape of region 32D in the heat dissipation component 30D are as described in Embodiment 1, and therefore are omitted here.

[0151] In this embodiment, each of the multiple regions 32D also has a notch 321 formed by cutting off a portion of the edge opposite to the edge connected to the fin 31.

[0152] <Gap 321>

[0153] The notch 321 is formed by cutting off a portion of the edge of region 32D. More specifically, for example, as shown in the image. Figure 16 As shown, the notch 321 is formed by cutting off a portion of the edge that is part of the edge in region 32D and is opposite to the edge connected to the fin 31.

[0154] For example, Figure 16 As shown, the notch 321 is a semi-circular notch shape. Additionally, in Figure 16 In the example shown, the notch 321 is located in the center of the side of region 32D opposite to the side connected to the fin 31.

[0155] Here, on Figure 16 The dimension concept of the notch 321 in the example shown will be explained. When the outer diameter of the heat dissipation component 30D is set to, for example, φ70mm~80mm, and the radial length (length in the long strip direction) of the region 32D is set to about 11mm~14mm, the radial length R1 of the notch 321 is about 2mm.

[0156] [Effects, etc.]

[0157] As explained above, in the phosphor rings 1 and 1A of this embodiment, a notch 321 is also formed in the region 32D of the heat dissipation component 30D where multiple fins 31 are sheared and folded up.

[0158] This structure increases the area of ​​the vents, which function as ventilation holes in multiple regions 32D and allow airflow from multiple fins 31 to pass through, by an amount equivalent to the area of ​​the notch 321. This further promotes the flow of fluid (air) between the phosphor layer 12 and the heat dissipation component 30D. Consequently, the temperature of the phosphor layer 12 can be further reduced, thus improving the heat dissipation performance of the phosphor wheels 1 and 1A.

[0159] Here, the verification results of the actual machine that prototyped and verified the phosphor wheel of this embodiment as described above will be explained.

[0160] Figure 17 This is a graph showing the verification results of actual prototypes of the phosphor wheels 1 and 1A according to Embodiment 3. Figure 17The results show the temperature rise of the phosphor layer 12 during the specified time operation and the noise level during the specified time operation. Additionally, in... Figure 17 In the comparison, the verification results of the prototype of the fluorescent wheel 1, 1A of Embodiment 1 without the notch 321 are also shown.

[0161] according to Figure 17 It can be confirmed that the temperature rise of the phosphor layer 12 of phosphor wheels 1 and 1A in Embodiment 3 is lower than the temperature rise of the phosphor layer 12 of phosphor wheels 1 and 1A in the comparative example.

[0162] Furthermore, although the heat dissipation performance of the phosphor wheels 1 and 1A can be improved by forming a structure with multiple fins 31 on the heat dissipation component 30 (30D), this structure also results in byproducts such as wind shear noise. However, it is known that there is no difference in noise level between the phosphor wheels 1 and 1A of Embodiment 3 and the phosphor wheels 1 and 1A of the comparative example.

[0163] Figure 18 This is a diagram showing the analytical results of the fluid flow near the fins 31 of the heat dissipation component 30 in the comparative example. Figure 19 This is a diagram showing the analytical results of the fluid flow near the fins 31 of the heat dissipation component 30D in Embodiment 3. Figure 18 and Figure 19 In the diagram, streamlines are used to represent the flow of fluid (air) through regions 32 and 32D, which function as vents, toward the fins 31. Additionally, Figure 18 and Figure 19 The vector lines shown illustrate the flow of fluid (air).

[0164] For example, Figure 18 As shown, the fin 31 has the following function: to enclose the area sandwiched between the planar portion of the heat dissipation member 30 on which the fin 31 is provided and the substrate 11 (for example, see reference). Figure 1 and Figure 7 The fluid (air) present in the phosphor layer 12 is pushed outward toward the outer periphery of the heat dissipation member 30. This function promotes heat conduction through convection in the phosphor wheels 1 and 1A of embodiments 1 and 2, thus lowering the temperature of the phosphor layer 12 disposed on the substrate 11. Furthermore, fluid flowing into the fins 31 from the region 32, which functions as a vent, is also blown onto the fins 31 and then pushed outward toward the outer periphery of the heat dissipation member 30. This also aids in promoting heat conduction.

[0165] In this embodiment, by providing a notch 321 in region 32D of the heat dissipation component 30D, the area of ​​the vent hole, which functions as region 32D, can be increased. Thus, as... Figure 19 As shown, it can be imagined that the increased flow through the vent, which serves as the area 32D and the notch 321, promotes heat conduction through convection and improves heat dissipation.

[0166] (Modified Example)

[0167] Furthermore, the size and shape of the notch 321 are not limited to... Figure 16 The example shown is as follows. Regarding the deformation of the dimensions (size) and shape of the notch 321, use... Figures 20A to 21B Please provide an explanation.

[0168] Figure 20A and Figure 20B This is a diagram showing another example of the dimensions of the notch 321 in embodiment 3. Figure 20A and Figure 20B The notch 321 shown in the figure is compared to Figure 16 The example shown is formed to a large size. Here, will Figure 16 The radial length R1 of the notch 321 shown is set to approximately 2 mm, and the radial length (length in the elongated direction) of region 32D is set to approximately 11 mm to 14 mm. In this case, Figure 20A The radial length R3 of the notch 321 shown could, for example, be approximately 6 mm. Furthermore, Figure 20B The radial length R5 of the notch 321 shown can be, for example, about 10 mm.

[0169] Figure 21A and Figure 21B This is a diagram showing another example of the shape of the notch 321A in a modified embodiment 3. Figure 21A and Figure 21B The notch 321A shown in the figure is in conjunction with Figure 16 The examples shown are formed in different shapes. More specifically, the notch 321A is formed in a V-shape at the center of the side of region 32D opposite to the side connected to the fin 31. The notch 321A is as follows... Figure 21A and Figure 21B As shown, the size can be either small or large.

[0170] Thus, the shape of the notch 321A can also be a V-shaped notch. Alternatively, the V-shaped notch can also be a triangular shape.

[0171] In addition, Figure 16 In the example shown, the notch 321 is formed at the center of the edge in region 32D opposite to the edge connected to the fin 31, but it is not limited to this. Hereinafter, we will use... Figure 22A and Figure 22BThe deformation at the location where the notch 321 is formed is explained.

[0172] Figure 22A This diagram illustrates an example where a notch 321B, a variation of Embodiment 3, is formed on the heat dissipation component 30D near the rotation axis J. More specifically, as... Figure 22A As shown, the notch 321B can also be formed in region 32D at the rotation axis J of the heat dissipation member 30D, on the side opposite to the side connected to the fin 31, which is closer to the center of the heat dissipation member 30D.

[0173] Figure 22B This diagram illustrates an example where a notch 321C, a variation of Embodiment 3, is formed at the outer periphery of the heat dissipation component 30D. More specifically, as... Figure 22B As shown, the notch 321C may also be formed in region 32D at the outer periphery of the heat dissipation member 30D, opposite to the side connected to the fin 31, compared to the central portion.

[0174] in addition, Figure 22A The notch 321B shown and Figure 22B The notch 321C shown is a semi-circular notch, but it can also be a V-shaped notch.

[0175] Figure 23 This is a graph showing the analytical results regarding the temperature reduction effect of the phosphor layer 12 of the phosphor rings 1 and 1A of this disclosure. Figure 23 The results shown are analytical results obtained from thermal fluid simulation.

[0176] exist Figure 23 In the middle, Figure 15 The notch 321, which has a length R1 along the radial direction r and is semi-circular in shape, is denoted as 321(R1). Figure 20A The notch 321, with a length R3 along the radial direction r, is denoted as 321(R3). Furthermore, Figure 20B The notch 321, with a length R5 along the radial direction r, is denoted as 321(R5). Furthermore, in Figure 23 Lieutenant General Figure 21A The small V-shaped notch 321A shown is designated as 321A (small). Figure 21B The large V-shaped notch shown is designated as 321A (large).

[0177] In addition, Figure 23 In the middle, Figure 22A The notch 321B formed on the heat dissipation component 30D near the rotation axis J is shown as 321B. Figure 22BThe notch 321C formed at the outer periphery of the heat dissipation component 30D is designated as 321C. Furthermore, the radial length r of 321B and 321C is set to R1. Furthermore, in Figure 23 As a comparative example, the results are also shown in the case where there is no notch, such as in region 32 of embodiment 1.

[0178] according to Figure 23 It can be seen that the larger the area of ​​the notch 321, the greater the temperature reduction effect of the phosphor layer 12. Furthermore, by comparing the temperature reduction effect (results) of the phosphor layer 12 within the dashed border, the following can also be observed. It can be seen that even with a semi-circular notch shape of the same length in the radial direction r, forming a notch at the outer periphery of the heat dissipation member 30D or near the rotation axis J on the edge of region 32D compared to the central portion, results in a temperature reduction effect of the phosphor layer 12. Hereinafter, the notch 321B formed near the rotation axis J and the notch 321 formed in the central portion are compared to examine the reasons for the higher temperature reduction effect of the phosphor layer 12, and this will be explained.

[0179] Figure 24 This is a diagram showing the analytical results of the fluid flow near the fins 31 of the heat dissipation component 30D, which has a notch 321B formed at the rotation axis J. Figure 24 In the diagram, streamlines are used to represent the flow of fluid (air) flowing in from the notch 321B.

[0180] according to Figure 24 It is known that the fluid (air) flowing in from the notch 321B formed near the rotation axis J contacts the fins 31 and flows out from the rotation axis J side toward the outer periphery of the heat dissipation component 30D. Furthermore, it is known that the fluid repeatedly contacts the fins 31 and flows out toward the outer periphery of the heat dissipation component 30D. That is, compared to the notch 321 formed in the central portion, the notch 321B formed near the rotation axis J allows more fluid to spend a longer time in contact with the fins 31, thus enabling more heat exchange between the fluid and the fins 31. Therefore, it is conceivable that the temperature reduction effect of the phosphor layer 12 is greater and the heat dissipation is improved compared to the notch 321 formed in the central portion.

[0181] Furthermore, the notch 321C formed near the outer periphery was compared with the notch 321 formed in the center, and the reason for the higher temperature reduction effect of the phosphor layer 12 was explained.

[0182] First, in Embodiment 3, which is a rotating shaft, the phosphor wheels 1 and 1A move faster closer to the outer periphery. Therefore, fluid flowing in from the notch 321C formed near the outer periphery moves faster than fluid flowing in from the notch 321 formed in the center. It is conceivable that a faster flow rate promotes heat exchange with the fins 31 compared to a slower flow rate, thus improving heat dissipation.

[0183] Thus, it can be understood that, due to the flow rate of the fluid flowing into the region 32D with the notch 321C formed at the outer periphery, the temperature reduction effect of the notch 321C formed at the outer periphery is greater than that of the notch 321 formed at the center, thereby improving heat dissipation.

[0184] (Implementation Method 4)

[0185] In Embodiments 1 to 3 described above, structures for improving the heat dissipation performance of phosphor wheels 1 and 1A were explained. In Embodiment 4 below, a structure for phosphor wheels 1 and 1A capable of suppressing wind shear noise will be described. Hereinafter, the description will focus on the differences from the heat dissipation component 30 described in Embodiment 1.

[0186] [Heat dissipation component 30E]

[0187] Figure 25 This is a frontal perspective view of the heat dissipation component 30E of embodiment 4, viewed from the first main surface side. Figure 26 yes Figure 25 A partially enlarged side view of the heat dissipation component 30E and the substrate 11. Figure 26 In, it means, for example Figure 25 The heat dissipation component 30E is enclosed by the dashed circular frame. Additionally, regarding... Figure 5 and Figure 6 The same elements are assigned the same symbols, and detailed explanations are omitted.

[0188] Figure 25 and Figure 26 The heat dissipation component 30E shown is relative to Figure 5 and Figure 6 The heat dissipation component 30 shown is different in that its outer peripheral end is bent in an R-shape (arc-shaped bend) toward the substrate 11.

[0189] Similar to Embodiment 1, the heat dissipation component 30E is made of a plate material and is disposed facing one of the first and second main surfaces of the substrate 11, and rotates together with the substrate 11. Furthermore, the heat dissipation component 30E is a disk-shaped plate material that is driven to rotate by a motor 40 about a rotation axis J. In other words, the shape of the heat dissipation component 30E in its plan view is circular. Figure 25As shown, the heat dissipation component 30E has multiple fins 31, a region 32, and a protrusion 34, and the heat dissipation component 30E is provided with an opening 33. The dimensions and materials of the heat dissipation component 30E are as described in Embodiment 1, and therefore the description is omitted here.

[0190] In this embodiment, the heat dissipation component 30E also has a bent end 301, which is formed by bending the outer peripheral end of the heat dissipation component 30E toward the same direction as the shearing and folding of the plurality of fins 31 when viewed from the heat dissipation component 30E, and the bent end 301 has an obtuse bending angle.

[0191] <Bent end 301>

[0192] The bent end 301 is formed using a portion of the heat dissipation component 30E. More specifically, for example... Figure 25 As shown, the bent end 301 is formed by bending the outer peripheral end of the heat dissipation component 30E in the same direction as the direction in which the plurality of fins 31 are cut and folded when viewed from the heat dissipation component 30E.

[0193] The shape of the bent end 301 when the heat dissipation component 30E is cut along a straight line along the radial direction r is, for example, as shown in the figure below. Figure 26 As shown, it is an R-shaped bend.

[0194] Here, use Figure 27 The dimensional concept of the bent end 301 and the R-shaped bend shape are explained.

[0195] Figure 27 yes Figure 26 A magnified perspective view of the area near the curved end 301 shown. Figure 28 Is with Figure 26 Enlarged perspective view of the area near the curved end 301A of different sizes shown.

[0196] Assuming the outer diameter of the heat dissipation component 30E is approximately φ70mm to 80mm... Figure 27 The bent end 301 shown is bent in an R-shape with an obtuse angle, having a length and height of approximately 1.0 mm. However, the concept of the dimensions of the R-shaped bend of the bent end 301 is not limited to this case. For example... Figure 28 As shown, the bent end 301A can also be bent in an R-shape with a length of about 0.5 mm and a height of about 1 mm and an obtuse angle. Although not shown, the bent end can also be bent in an R-shape with a length of about 1.5 mm and a height of about 1.0 mm and an obtuse angle.

[0197] [Effects, etc.]

[0198] As explained above, in the phosphor wheels 1 and 1A of this embodiment, there are bent ends 301 and 301A formed by bending the outer peripheral end of the heat dissipation member 30E in an R-shape at an obtuse angle toward the same direction as when viewed from the heat dissipation member 30E where the plurality of fins 31 are cut and folded. As a result, wind shear noise can be suppressed.

[0199] Here, the verification results of the actual prototype of the phosphor wheels 1 and 1A of this embodiment, configured as described above, will be explained.

[0200] Figure 29 This is a graph showing the verification results of actual prototypes of the phosphor wheels 1 and 1A according to Embodiment 4. Figure 29 In the figure, the temperature rise of the phosphor layer 12 after the specified time of action and the noise level during the specified time of action are presented as verification results. Additionally, in Figure 29 As a comparative example, the verification results of the prototype of the fluorescent wheel 1, 1A of Embodiment 1 without the curved end 301 are also presented.

[0201] according to Figure 29 It can be seen that the temperature rise of the phosphor layer 12 of phosphor wheels 1 and 1A in Embodiment 4 is no different from that of the phosphor layer 12 of phosphor wheels 1 and 1A in the comparative example. On the other hand, it can be confirmed that the noise level of phosphor wheels 1 and 1A in Embodiment 4 is lower than that of phosphor wheels 1 and 1A in the comparative example.

[0202] Figure 30A This is a graph showing the analytical results of the relative velocity near the outer peripheral end of the heat dissipation component 30 in the comparative example. Figure 30B This is a graph showing the analytical results of the relative velocity of the fluid near the bent end 301 of the heat dissipation component 30E in Embodiment 4. Here, Figure 30A The relative velocity is the relative velocity of the fluid near the surface of the substrate 11 and near the outer peripheral end of the heat dissipation component 30. Figure 30B The relative velocity is the relative velocity of the fluid near the surface of the substrate 11 and near the curved end 301 of the heat dissipation component 30E.

[0203] For example, Figure 30A As shown in the dashed region a, in the comparative example, in the area where the substrate 11 and the heat dissipation component 30 are opposite, a portion with a high relative velocity of the flow can be seen near the surface of the substrate 11. Furthermore, the relative velocities of the flow are also different in this region, so it is conceivable that vortices will occur in this flow domain. It is conceivable that these vortices are a major factor in generating noise.

[0204] On the other hand, for example, Figure 30BAs shown in the dashed area b, in this embodiment, a region with high relative flow velocity is not visible in the area where the substrate 11 and the heat sink 30E face each other. Based on the comparative example and this embodiment, it is conceivable that by processing the outer peripheral end of the heat sink 30E into a curved end 301, the relative velocity of the flow in this region can be homogenized, reducing the occurrence of turbulent vortices in this region. This is expected to result in noise reduction. Specifically, in this embodiment, the outer peripheral end of the heat sink 30E is formed by R-shaped bending of the outer peripheral end towards the same direction as the direction in which the plurality of fins 31 are sheared and folded when viewed from the heat sink 30E, thus forming curved ends 301 and 301A. Therefore, it is conceivable that the variation in relative velocity of the flow near the surface of the substrate 11, which is visible in the comparative example, can be mitigated, thereby reducing the noise level compared to the comparative example.

[0205] Therefore, it is conceivable that one can obtain Figure 29 The verification results shown indicate that the noise levels of phosphor wheels 1 and 1A in Embodiment 4 are lower than those of phosphor wheels 1 and 1A in the comparative examples.

[0206] (Variation Example 1)

[0207] Furthermore, the shape formed at the bent end of the heat dissipation component 30E is not limited to... Figure 27 and Figure 28 Examples are shown below. The following uses... Figures 31-33 This describes the deformation of the shape formed at the bent end of the heat dissipation component 30E.

[0208] Figure 31 and Figure 32 This is a diagram showing another example of the shape of the curved end formed in the heat dissipation component 30E according to embodiment 4. Figure 31 The image shows a partially enlarged side view of the heat dissipation component 30E with a bent end 301B and the substrate 11 in Modified Example 1. Figure 32 The middle indicates Figure 31 A magnified perspective view of the area near the curved end 301B shown. Figure 33 Is with Figure 32 Enlarged perspective view of the portion near the bent end 301C of different sizes of the bent end 301B shown.

[0209] More specifically, such as Figure 31 and Figure 32 As shown, the shape of the bent end 301B when the heat dissipation component 30E is cut with a straight line along the radial direction r can also be an angled bent shape.

[0210] Assuming the outer diameter of the heat dissipation component 30E is approximately φ70mm to 80mm... Figure 32The bent end 301B shown is bent at an obtuse angle (also called a C-bend) with a length and height of approximately 1.0 mm. However, the dimensional concept of the angled bend of the bent end 301B is not limited to this case. For example... Figure 33 As shown, the bent end 301C can also be bent at an angle with a length of about 1.5 mm and a height of about 1 mm and an obtuse angle. Although not shown, the bent end can also be bent at an angle with a length of about 1.0 mm and a height of about 0.5 mm and an obtuse angle.

[0211] Figure 34 This is a graph showing the analytical results of the temperature reduction effect of the phosphor layer 12 of the phosphor rings 1 and 1A in this embodiment. Figure 34 The results shown are analytical results obtained from thermal fluid simulation. In this thermal fluid simulation, the distance between the substrate 11 of the phosphor wheels 1 and 1A and the heat dissipation components 30 and 30E is set to 2 mm, the outer diameter of the heat dissipation components 30 and 30E is set to be approximately φ70 mm, the diameter φ of the contact surface of the protrusion 34 is set to be 37 mm, and the shorter length of the fin 31 is set to be approximately 1.7 mm.

[0212] also, Figure 34 The R shown refers to the fact that the outer peripheral end is bent in an R-shape towards the substrate 11. Figure 34 The "C" shown refers to the outer peripheral end being bent at an angle towards the substrate 11 (C-bending). Furthermore, in... Figure 34 Following the R or C shown, the length and height of the outer peripheral end are, for example, represented as 1*1.

[0213] More specifically, in Figure 34 In the text, "R1*1" indicates that the heat dissipation component 30E has, for example... Figure 27 The example shown is a bent end 301 with a length of approximately 1.0 mm and a height of approximately 1.0 mm, and a bending angle of obtuse angle, bent in an R-shape. "R1*0.5" indicates that the heat dissipation component 30E has, for example... Figure 28The example shown is a bent end 301A with a length of approximately 1.0 mm and a height of approximately 0.5 mm, bent at an obtuse angle in an R-shape. Similarly, "R1.5*1" indicates that the heat dissipation component 30E has a bent end with a length of approximately 1.5 mm and a height of approximately 1.0 mm, bent at an obtuse angle in an R-shape. "R2*2" indicates that the heat dissipation component 30E has a bent end with a length of approximately 2.0 mm and a height of approximately 2.0 mm, bent at an obtuse angle in an R-shape. "R2*1.5" indicates that the heat dissipation component 30E has a bent end with a length of approximately 2.0 mm and a height of approximately 1.5 mm, bent at an obtuse angle in an R-shape.

[0214] In addition, Figure 34 In the text, "C1*1" indicates that the heat dissipation component 30E has, for example... Figure 32 The example shown is a bent end 301B with an angled bend (C-bend) of approximately 1.0 mm in length and 1.0 mm in height, and with an obtuse angle. "C1.5*1" indicates that the heat dissipation component 30E has, for example... Figure 33 The example shown is a bent end 301C with an angled bend (C-bend) of approximately 1.5 mm in length and 1.0 mm in height, and with an obtuse angle. Furthermore, "C1*0.5" indicates that the heat dissipation component 30E has, for example... Figure 32 The example shown is a bent end with an angled bend (C-bend) that has a length of about 1.0 mm, a height of about 0.5 mm, and an obtuse angle.

[0215] Furthermore, in Figure 34 In the comparison example, the result is also shown when the heat dissipation component 30 of embodiment 1 does not have a structure with a bent end.

[0216] according to Figure 34 As can be seen from "R2*2", if the height of the bent end is about 2mm, eliminating the gap between the heat dissipation component 30E and the substrate 11, the temperature drop of the phosphor layer 12 becomes negative, meaning it loses its heat dissipation effect. Furthermore, according to... Figure 34 As can be seen from “R2*1.5”, if the height of the bent end is about 1.5mm or more, the temperature of the phosphor layer 12 will decrease to a negative value, which will impair the heat dissipation effect.

[0217] On the other hand, it can be known Figure 34 Although “R1*1”, “R1*0.5”, “R1.5*1”, “C1*1”, “C1.5*1” and “C1*0.5” did not differ in their effect on reducing the temperature of phosphor layer 12, they were more effective than the comparative example.

[0218] in addition, Figure 34 In this study, the noise levels of the comparative example, "R1*1", and "C1.5*1" were verified. This verification utilized the time derivative of the square mean pressure (mean square pressure) obtained from fluid analysis.

[0219] Furthermore, the main cause of noise generated by the phosphor wheels 1 and 1A of this disclosure is turbulent noise. Turbulent noise is the sound generated by turbulent vortices existing in the flow field. These vortices collide with each other and generate sound at the point of collapse. Since the phosphor wheels 1 and 1A of this disclosure rotate at high speed as rotating bodies, they contain many turbulent vortices.

[0220] Furthermore, it is well known that in low Mach number flows where the velocity is sufficiently slower than the speed of sound, according to the Lighthill-Curle theory, the sound pressure generated by vortices around an object can be calculated using the time derivative of the pressure on the object's surface. Therefore, based on the Lighthill-Curle theory, the value obtained by averaging the squared time derivative of the pressure can be used as an indicator of the magnitude of a noise source. Thus, the value of the time derivative of the squared average pressure (mean square pressure) obtained from fluid analysis is used as an indicator to identify the magnitude of the fluid noise generated when phosphor wheels 1 and 1A rotate.

[0221] Furthermore, since the time derivative of the pressure after square averaging can be derived through fluid analysis, it can also be described as a value obtained by numerating the pressure variation on the surface of the phosphor wheels due to the rotational motion of phosphor wheels 1 and 1A. In fluid analysis, transient responses are calculated to capture the time-varying pressure. As a method for examining the results obtained from this transient response calculation, it is often used to evaluate the flow field after time averaging. If the pressure on the object surface is differentiated over time, the value will have positive and negative variations, which will cancel each other out under normal averaging, becoming 0 (zero). Therefore, the value after square averaging is used. Thus, the magnitude of the positive and negative time variations can be evaluated (verified) using a contour plot (a plot like contour lines) to assess the noise level.

[0222] Figure 35 yes Figure 34 A contour plot of the time derivative of the square mean pressure in a comparative example. Figure 36 yes Figure 34 A contour map of the time derivative of the squared average pressure of “R1*1”. That is, in Figure 36 The figure shows a contour plot of the time derivative of the squared average pressure when the heat dissipation component 30E has a bent end 301. Figure 37 yes Figure 34A contour map of the time derivative of the squared average pressure of “C1.5*1”. That is, in Figure 37 The figure shows a contour plot of the time derivative of the squared average pressure when the heat dissipation component 30E has a bent end 301C.

[0223] Will Figure 35 and Figure 36 and Figure 37 A comparison shows that, compared to Figure 35 Near the outer peripheral end of the heat dissipation component 30 in the comparative example shown, Figure 36 or Figure 37 The time derivative of the squared average pressure near the outer peripheral edge of the heat dissipation component 30E, which has a bent end 301 or a bent end 301C, is small. Therefore, it can be said that... Figure 35 Compared to the area near the outer peripheral end of the heat dissipation component 30 in the comparative example shown, Figure 36 or Figure 37 The heat dissipation component 30E shown with a bent end 301 or a bent end 301C has reduced the occurrence of turbulent vortices near its outer peripheral edge, which can be expected to result in a reduction in noise.

[0224] thus, Figure 34 The “R1*1” and “C1.5*1” mean that the outer peripheral end of the heat dissipation component 30E forms a bent end 301 or a bent end 301C, which can be said to be an effective means of achieving low noise without hindering the heat dissipation effect.

[0225] According to this embodiment, by forming a curved end at the outer peripheral end of the heat dissipation component 30E, the wind shear noise generated by the multiple fins 31 can be suppressed without hindering the heat dissipation performance of the phosphor wheels 1 and 1A.

[0226] (Variation Example 2)

[0227] Furthermore, the shape formed at the bent end of the heat dissipation component 30E is not limited to the aforementioned R-shaped bend or angled bend, but may also be a Z-shaped bend.

[0228] Figure 38 and Figure 39 This is another example of the shape formed at the curved end of the heat dissipation component 30E according to embodiment 4. Figure 38 The image shows a partially enlarged side view of the heat dissipation component 30E with a bent end 301D and the substrate 11 in Modified Example 2. Figure 39 The middle indicates Figure 38 A magnified perspective view of the area near the curved end 301D shown. Figure 40 Is with Figure 39Enlarged perspective view of the area near different curved ends 301D shown.

[0229] More specifically, such as Figure 38 and Figure 39 As shown, the shape of the bent end 301D when the heat dissipation component 30E is cut with a straight line along the radial direction r can also be a Z-shaped bend.

[0230] Assuming the outer diameter of the heat dissipation component 30E is approximately φ70mm to 80mm... Figure 39 The bent end 301D shown is Z-shaped, with lengths L1 and L2 of approximately 1.0 mm and a height of approximately 2 mm. Length L1 is the distance from the outer perimeter, and length L2 is the length of the upright portion of the bent end 301D. Furthermore, the Z-shaped bent portion of the bent end 301D is L-shaped, but this is not a limitation. For example... Figure 40 As shown, the Z-shaped bend of the bent end 301D can also be R-shaped. Additionally, Figure 40 The dimensional concept of the bent end 301D shown is similar to Figure 39 The bent end 301D shown is the same. That is, Figure 40 The bent end 301D shown can also be bent in a Z-shape with lengths L1 and L2 of 1.0 mm and a height of about 2 mm.

[0231] (Other implementation methods, etc.)

[0232] The above-described implementation methods and variations are merely examples, and various changes, additions, omissions, etc., are possible.

[0233] Furthermore, any combination of the constituent elements and functions shown in the above embodiments and variations is also included within the scope of this disclosure. For example, the structure shown in Embodiment 2 can be added to the heat dissipation member with the curved end shown in Embodiment 4. That is, a through hole can be provided on the peripheral wall of the protrusion of the heat dissipation member with the curved end shown in Embodiment 4. Furthermore, the structure shown in Embodiment 3 can be added to the heat dissipation member with the curved end shown in Embodiment 4. That is, a notch can be formed in the area of ​​the heat dissipation member with the curved end shown in Embodiment 4. Furthermore, the structures shown in Embodiments 2 and 3 can be added to the heat dissipation member with the curved end shown in Embodiment 4. That is, a notch can be formed in the area of ​​the heat dissipation member with the curved end shown in Embodiment 4, and a through hole can be provided on the peripheral wall of the protrusion of the heat dissipation member. Through these, the structure of the phosphor wheels 1 and 1A, which can not only suppress wind shear noise but also improve heat dissipation, can be realized.

[0234] In addition, this disclosure also includes forms obtained by applying various modifications to the above-described embodiments and variations that can be conceived by those skilled in the art, or forms achieved by arbitrarily combining the constituent elements and functions of each embodiment without departing from the spirit of this disclosure. For example, new embodiments may be constructed by combining the constituent elements described in the embodiments and variations.

[0235] Furthermore, the constituent elements described in the accompanying drawings and detailed embodiments include both those necessary for solving the problem and those not necessary for solving the problem, which are used to illustrate the above-described technology. Therefore, even if these non-essential constituent elements are described in the drawings and detailed description, they should not be immediately regarded as essential constituent elements.

[0236] In addition, this disclosure also includes a light source device or laser projector composed of a phosphor wheel.

[0237] That is, this disclosure also includes a light source device, which includes: an excitation light source such as a phosphor wheel or a laser light source as shown in the above embodiments and modifications, and an optical system for guiding the emitted light from the excitation light source to the phosphor wheel. Furthermore, this disclosure also includes a projection-type image display device, which includes: a phosphor wheel as shown in the above embodiments and modifications; a motor for rotating the phosphor wheel; a laser light source for irradiating a phosphor layer with laser light; a light modulation element for modulating light emitted from the phosphor layer corresponding to the laser light irradiated by the laser light source, according to an image signal; and a projection lens for projecting the light modulated by the light modulation element.

[0238] Industrial applicability

[0239] The phosphor wheel disclosed herein is a reflective phosphor wheel and can be applied to projection-type image display devices such as laser projectors, lighting devices facing equipment, and light sources for endoscopes.

[0240] Symbol Explanation

[0241] 1. 1A Phosphor wheel; 11 Substrate; 12 Phosphor layer; 30, 30B, 30C, 30D, 30E, 90 Heat dissipation components; 31 Fins; 32, 32D Regions; 33 Opening; 34, 34B, 34C Protrusions; 35B, 35C, 95 Through holes; 40 Motor; 41 Adjustment plate; 301, 301A, 301B, 301C, 301D Bent ends; 321, 321A, 321B, 321C Notches; 341 Contact surface; 342 Peripheral wall.

Claims

1. A fluorescent ring, have: The substrate has a first main surface and a second main surface facing away from each other; A phosphor layer is disposed on the aforementioned first main surface; and The heat dissipation component, made of sheet metal, is disposed facing one of the aforementioned first and second main surfaces and rotates together with the aforementioned substrate. The above-mentioned heat dissipation component has: A protrusion is provided in the central part of the heat dissipation component in such a way that it protrudes toward one of the aforementioned surfaces, and has a contact surface that contacts the aforementioned surface. Multiple fins are formed by shearing and folding multiple areas in the peripheral region other than the central portion mentioned above; and The bent end is formed by bending the outer peripheral edge of the heat dissipation component in the same direction as the direction in which the plurality of fins are cut and folded when viewed from the heat dissipation component, and the bent end has an obtuse bending angle. The protrusion contacts the substrate via the contact surface, thereby ensuring a certain distance between the substrate and the heat dissipation component, and conducting the heat from the substrate to the peripheral area of ​​the heat dissipation component.

2. The phosphor ring as described in claim 1, When the aforementioned heat dissipation component is cut with a straight line along the radial direction, the shape of the bent end is an R-shaped bend.

3. The phosphor ring as described in claim 1, When the aforementioned heat dissipation component is cut with a straight line along the radial direction, the shape of the bent end is a Z-shaped bend.

4. The phosphor ring as described in claim 1, The shape of the bent end of the aforementioned heat dissipation component when cut along a radial straight line is an angled bend.

5. The phosphor ring as described in claim 1, The aforementioned multiple fins are each cut and folded towards one of the aforementioned surfaces.

6. The phosphor ring as described in claim 1, The phosphor layer is configured in a strip and annular shape on one side of the substrate. The diameter of the aforementioned heat dissipation component is smaller than the inner diameter of the aforementioned phosphor layer.

7. The fluorescent wheel as described in any one of claims 1 to 6, The aforementioned substrate is disk-shaped. The phosphor layer is formed as a strip along the circumference of the substrate.

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