Rotating body mounting structure and projection type image display device

Abstract

A rotating body attachment structure of the present disclosure is for attaching a rotating body, which has a screw hole formed on an attachment surface, onto a support body, which has an attachment hole penetrating in the axial direction of the axis of rotation of the rotating body. The rotating body attachment structure comprises: an elastic member that has a through hole in the axial direction and is fitted into the attachment hole; and a fixation member inserted into the through hole. The fixation member comprises a middle section arranged in the through hole of the elastic member in the axial direction, a distal end section exposed from the through hole at an attachment surface side, and a posterior end section exposed from the through hole at the opposite side of the attachment surface. A screw thread, which threads into a screw hole, is formed in the distal end section. The posterior end section has a first wall surface intersecting the axial direction. In a state where the distal end section has been threaded into the screw hole, the elastic member is compressed between the attachment surface and the first wall surface.

Description

Technical Field

[0001] The present disclosure relates to a rotating body mounting structure for mounting a rotating body. The present disclosure also relates to a rotating body mounting structure for mounting an optical rotating body such as a phosphor wheel or a color wheel, and a projection type video display device including the same.

Background Art

[0002] A rotating body that is rotated by rotationally driving a rotation axis is used in, for example, rotating equipment typified by a stirrer, a fan, or the like. In an optical device such as a projection type video display device, an optical rotating body such as a phosphor wheel or a color wheel is used. As a fixing device for mounting these rotating bodies, for example, there is one disclosed in Patent Document 1.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] In the rotating body fixing device of Patent Document 1, the rotating body is mounted on a rotating body mounting portion so as to be rotatable about the rotation axis and positioned in the axial direction, and is fixed by tightening a nut. In Patent Document 1, it is possible to sufficiently secure the fixing force of the rotating body so that the fixing nut does not loosen even when the rotating body rotates in the reverse direction.

[0005] However, in a rotating body fixing structure like that described in Patent Document 1, the rotating body is fixed to the rotating body mounting part by directly contacting a threaded component such as a nut. In such a configuration, while the rotating body is rotating, the vibration of the motor is directly transmitted to the rotating body mounting part via the threaded component. Such vibrations can be amplified by resonance with surrounding mechanical components, potentially generating significant noise. Furthermore, optical rotating bodies such as phosphor wheels or color wheels used in projection-type image display devices have the challenge of maintaining mounting accuracy while suppressing noise caused by motor vibrations.

[0006] Therefore, this disclosure aims to solve the above-mentioned conventional problems and to provide a rotating body mounting structure that can suppress noise caused by vibrations during the rotation of the rotating body. [Means for solving the problem]

[0007] To achieve the above objective, a rotating body mounting structure according to one aspect of the present disclosure is a rotating body mounting structure for mounting a rotating body having a screw hole formed in the mounting surface to a support having a mounting hole that penetrates in the axial direction of the rotation axis of the rotating body, comprising: an elastic member having an axial through hole and fitted into the mounting hole; and a fixing member inserted into the through hole, wherein the fixing member includes, in the axial direction, a central portion positioned within the through hole of the elastic member, a tip portion exposed from the through hole on the mounting surface side, and a rear end portion exposed from the through hole on the opposite side of the mounting surface, wherein the tip portion has screw threads that screw into the screw hole, and the rear end portion has a first wall surface intersecting the axial direction, and the elastic member is compressed between the mounting surface and the first wall surface when the tip portion is screwed into the screw hole. [Effects of the Invention]

[0008] According to one aspect of the present disclosure, a rotating body mounting structure can suppress noise caused by vibrations during the rotation of the rotating body. [Brief explanation of the drawing]

[0009] [Figure 1]Diagram showing the overall configuration of the projection-type video display device according to Embodiment 1. [Figure 2] Schematic diagram of the light source device in a projection-type video display device (Figure 1) [Figure 3] Figure 2 shows an example of the configuration of the light-receiving surface of the phosphor wheel in the light source device. [Figure 4] Figure 2 shows an example of the configuration of the light-receiving surface of a color wheel in a light source device. [Figure 5] Perspective view showing the installation of the phosphor wheel. [Figure 6] Perspective view showing the installation of the color wheel. [Figure 7] Side view showing the installation of the phosphor wheel. [Figure 8] Exploded perspective view showing the mounting of a phosphor wheel using the rotating body mounting structure according to Example 1. [Figure 9A] Cross-sectional view showing the configuration of the rotating body mounting structure according to Example 1. [Figure 9B] Cross-sectional view showing the configuration of a rotating body mounting structure according to a modified example of Example 1. [Figure 10] Cross-sectional view showing the configuration of the rotating body mounting structure according to Example 2. [Figure 11] Schematic diagram showing the noise measurement setup for projection-type image display devices. [Figure 12A] Graph showing noise measurement results due to vibrations during rotation of a phosphor wheel. [Figure 12B] Graph showing noise measurement results due to vibrations during the rotation of the color wheel. [Modes for carrying out the invention]

[0010] According to a first aspect of the present disclosure, there is provided a rotating body mounting structure for mounting a rotating body having a screw hole formed in an attachment surface to a support body having an attachment hole penetrating in the axial direction of the rotation axis of the rotating body, the rotating body mounting structure including: an elastic member having an axially penetrating hole and fitted into the attachment hole; and a fixing member inserted into the penetrating hole, the fixing member including: a central portion disposed within the penetrating hole of the elastic member in the axial direction; a tip portion exposed from the penetrating hole on the attachment surface side; and a rear end portion exposed from the penetrating hole on the side opposite to the attachment surface, the tip portion having a thread formed thereon that engages with the screw hole, the rear end portion having a first wall surface intersecting the axial direction, and the elastic member being compressed between the attachment surface and the first wall surface when the tip portion is screwed into the screw hole.

[0011] According to this aspect, it is possible to provide a rotating body mounting structure capable of suppressing noise due to vibration during rotation of the rotating body.

[0012] According to a second aspect of the present disclosure, the fixing member further has a second wall surface intersecting the axial direction at the boundary between the tip portion and the central portion, and the second wall surface abuts against the attachment surface when the tip portion is screwed into the screw hole, thereby providing the rotating body mounting structure according to the first aspect.

[0013] According to a third aspect of the present disclosure, the fixing member includes a sleeve and a screw member partially inserted into the sleeve, the sleeve including a first portion disposed within the penetrating hole and a second portion exposed from the penetrating hole on the side opposite to the attachment surface, the screw member having a tip portion exposed from the sleeve on the attachment surface side and a head portion exposed from the sleeve on the side opposite to the attachment surface, and the second portion of the sleeve constituting the first wall surface when the tip portion of the screw member is screwed into the screw hole, thereby providing the rotating body mounting structure according to the first or second aspect.

[0014] According to a fourth aspect of the present disclosure, the fixing member includes a sleeve and a screw member partially inserted into the sleeve. The sleeve is disposed in a through hole, and the screw member has a tip portion exposed from the sleeve on the mounting surface side and a head portion exposed from the sleeve on the opposite side of the mounting surface. When the tip portion of the screw member is screwed into the screw hole, the head portion constitutes the first wall surface, and a rotating body mounting structure according to the first or second aspect is provided.

[0015] According to a fifth aspect of the present disclosure, when the tip portion of the screw member is screwed into the screw hole, the sleeve has an end portion on the mounting surface side contacting the mounting surface and an end portion on the opposite side of the mounting surface contacting the head portion, and a rotating body mounting structure according to the third or fourth aspect is provided.

[0016] According to a sixth aspect of the present disclosure, the fixing member is integrally formed and includes a screw portion formed with threads, a diameter-expanded portion having an outer diameter larger than the outer diameter of the thread, and a wall surface end portion having a diameter larger than the outer diameter of the diameter-expanded portion. The diameter-expanded portion is between the screw portion and the wall surface end portion and is inserted into the through hole. When the screw portion is screwed into the screw hole, the wall surface end portion constitutes the first wall surface at the boundary with the diameter-expanded portion, and a rotating body mounting structure according to the first or second aspect is provided.

[0017] According to a seventh aspect of the present disclosure, when the screw portion is screwed into the screw hole, an end portion of the diameter-expanded portion at the boundary between the diameter-expanded portion and the screw portion contacts the mounting surface, and a rotating body mounting structure according to the sixth aspect is provided.

[0018] According to an eighth aspect of the present disclosure, the elastic member has a recess formed along the circumferential direction on the outer peripheral surface, and the support member around the mounting hole is fitted into the recess, and a rotating body mounting structure according to any one of the first to seventh aspects is provided.

[0019] According to a ninth aspect of the present disclosure, the fixing member is made of a material containing metal, and a rotating body mounting structure according to any one of the first to eighth aspects is provided.

[0020] According to a tenth aspect of this disclosure, a rotating body mounting structure according to any one of the first to ninth aspects is provided, wherein the elastic member is made of a material including, for example, ACM rubber.

[0021] According to the eleventh aspect of this disclosure, the rotating body constitutes a phosphor wheel that converts incident light into light of different wavelengths and emits it, or a color wheel that transmits incident light through multiple color bands and emits it, providing a rotating body mounting structure according to any one of the first to tenth aspects.

[0022] According to a twelfth aspect of this disclosure, a light source device is provided, comprising a light source that emits incident light, and a phosphor wheel that converts incident light into light of different wavelengths and emits it, or a color wheel that transmits incident light through multiple color bands and emits it, mounted using a rotating mounting structure described in any one of the first to eleventh aspects.

[0023] According to a thirteenth aspect of this disclosure, a projection-type video display device is provided, comprising: a light source device as described in claim 12; a projection light generation unit that generates projection light according to a video signal; a light guide optical system that guides illumination light emitted from the light source device to the projection light generation unit; and a projection optical system that displays an image by magnifying and projecting the projection light from the projection light generation unit.

[0024] Furthermore, by appropriately combining any of the above various embodiments, the effects of each can be achieved.

[0025] The embodiments will be described in detail below, with reference to the drawings as appropriate. However, unnecessarily detailed explanations may be omitted. For example, detailed explanations of already well-known matters and redundant explanations of substantially identical configurations may be omitted. This is to avoid the following explanation becoming unnecessarily verbose and to facilitate understanding for those skilled in the art.

[0026] The rotating body mounting structure and projection-type image display device according to the embodiments of this disclosure are shown in Figures 1 to 1. 2This will be explained with reference to B. The attached drawings and the following description are provided to enable those skilled in the art to fully understand this disclosure and are not intended to limit the subject matter described in the claims. In addition, elements are exaggerated in each drawing for the sake of clarity. Substantially identical components in the drawings are denoted by the same reference numerals.

[0027] (Overall configuration of the projection-type image display device according to Embodiment 1) The configuration of the projection-type image display device according to Embodiment 1 will be explained with reference to Figure 1. Figure 1 is a diagram showing the overall configuration of the projection-type image display device 10 according to Embodiment 1.

[0028] As shown in Figure 1, the projection-type image display device 10 comprises a light source device 30, a light guide optical system 40, a projection light generation unit 50, a projection optical system 60, and a control unit 70. Based on the light emitted by the light source device 30, the projection-type image display device 10 generates projection light corresponding to the input video signal using the projection light generation unit 50, and projects the projection light generated by the projection optical system 60 onto an external screen or other projection target to display an image.

[0029] The light source device 30 includes a semiconductor laser and a solid-state light source such as a phosphor, and emits light under the control of the control unit 70. Specifically, the light source device 30 may include a light source and an illumination optical system that includes one or both of a phosphor wheel and a color wheel (details will be described later). Details of the configuration of the light source device 30 will be described later.

[0030] The light guide optical system 40 guides the light emitted from the light source device 30 to the projection light generation unit 50. The light guide optical system 40 is constructed by appropriately arranging various optical components such as various lenses, mirrors, and rods.

[0031] The projection light generation unit 50 includes a spatial light modulation element (not shown), such as a digital micromirror device or a liquid crystal panel. The projection light generation unit 50 modulates the incident light according to the video signal using the spatial light modulation element.

[0032] The projection optical system 60 guides the light emitted from the projection light generation unit 50 to the projection lens 10, and projects an enlarged image based on the light spatially modulated by the projection light generation unit 50 through the projection lens 10. The projection optical system 60 is composed of various optical components such as various lenses and mirrors.

[0033] The control unit 70 controls the overall operation of the projection-type image display device 10. The control unit 70 may include, for example, a video input terminal (not shown) for receiving video signals from an external source, and various drivers (not shown). The various drivers may include, for example, a light source driver, a wheel driver, and a display device driver. The light source driver drives the light emission operation of the light source in the light source device 30, the wheel driver rotates the phosphor wheel and color wheel provided in the light source device 30, and the display device driver can supply video signals to the spatial light modulation element in the projection light generation unit 50 and drive the spatial light modulation element. The various functions of the control unit 70 may also be incorporated into the various components of the projection-type image display device 10.

[0034] (Configuration of the light source device) The details of the configuration of the light source device 30 in the projection-type image display device 10 will be explained using Figure 2. Figure 2 is a schematic diagram of the light source device 30 in the projection-type image display device 10 shown in Figure 1. Below, as an example of a light source device that generates white light from blue light from a light source, a light source device 30 equipped with a phosphor wheel 350 and a color wheel 370 will be described. Note that Figure 2 shows the configuration of the light source device 30 in the XY plane.

[0035] As shown in Figure 2, the light source device 30 includes a laser light source 301, a dichroic mirror 310, focusing lenses 321, 322, 323, mirrors 311, 312, 313, lenses 331, 332, 333, a phosphor wheel 350, a color wheel 370, and a rod integrator 380.

[0036] In the light source device 30, the laser light source 301 emits blue laser light. The laser light source 301 may be composed of multiple semiconductor laser elements. The blue laser light from the laser light source 301 travels along the optical axis Oa and is incident on a dichroic mirror 310 that is positioned at an inclination angle of approximately 45 degrees with respect to the optical axis Oa.

[0037] The dichroic mirror 310 has the property of reflecting the blue laser light from the laser light source 301 and transmitting light in other wavelength ranges. The blue laser light incident in the -X direction in the diagram is reflected by the dichroic mirror 310, emitted in the +Y direction in the diagram, travels along the optical axis Ob, is focused by the focusing lens 321, and incident on the phosphor wheel 350.

[0038] The configuration of the phosphor wheel 350 will be explained with reference to Figure 3. Figure 3 shows an example of the configuration of the light-receiving surface of the phosphor wheel 350 in the light source device 30 of Figure 2. The phosphor wheel 350 is configured to emit, in a time-division manner, blue light transmitted from the blue laser light of the laser light source 301 and fluorescent light obtained by converting the blue laser light of the laser light source 301 to a different wavelength, by rotation.

[0039] As shown in Figure 3, the phosphor wheel 350 comprises a disc-shaped substrate 352 that is rotationally driven by a motor (not shown in Figure 3) via a central shaft 351. The substrate 352 can rotate around the shaft 351 along the rotation direction A shown in the figure, around the rotation axis O1, by the drive of the motor. By rotating the substrate 352, the temperature rise of the phosphor layer on the substrate 352 due to excitation light can be suppressed, and the wavelength conversion efficiency can be stably maintained.

[0040] As shown in Figure 3, an annular region 355 is formed on the light-receiving surface 352a of the substrate 352, and this annular region 355 is composed of an aperture region 355B and phosphor layer regions 355R and 355G. The aperture region 355B transmits the incident blue laser light. The phosphor layer regions 355R and 355G have phosphor layers formed thereon that are excited by the incident blue laser light and emit fluorescent light. In this embodiment, the phosphor layer region includes a red phosphor layer region 355R and a green phosphor layer region 355G formed along the circumferential direction, and these regions are excited by the incident blue laser light and emit red fluorescent light and green fluorescent light, respectively.

[0041] In the example of the phosphor wheel 350 configuration shown in Figure 3, the annular region 355 is shown to have two types of phosphor layer regions, but this disclosure is not limited thereto. For example, the annular region 355 of the phosphor wheel 350 can also be configured to have one type or three or more types of phosphor layer regions.

[0042] As the phosphor wheel 350 rotates, the blue laser light that has passed through the focusing lens 320 is incident on the aperture region 355B, where the blue light is transmitted and emitted. When it is incident on the phosphor layer regions 355R and 355G, it excites the phosphors, causing them to emit red and green fluorescent light.

[0043] Returning to Figure 2, the red and green fluorescent light generated in the phosphor layer regions 355R and 355G of the phosphor wheel 350 is reflected from the phosphor wheel 350 in the -Y direction, passes through the focusing lens 320, goes through the dichroic mirror 310, and travels along the optical axis Ob. Meanwhile, the blue light that passes through the aperture region 355B of the phosphor wheel 350 goes through the lens 322, travels along the path of mirrors 311, 331, 312, 332, 313, and 333, is reflected by the dichroic mirror 310, and is emitted along the optical axis Ob. The blue light emitted from the dichroic mirror 310 along the optical axis Ob in the -Y direction, along with the red and green fluorescent light, passes through the focusing lens 323 and is incident on the color wheel 370.

[0044] The color wheel 370 is configured to receive yellow fluorescent light and blue light transmitted from the phosphor wheel 350 through the focusing lens 330, and to transmit the light through multiple color bands by rotation and emit it in a time-division manner. The configuration of the color wheel 370 will be explained with reference to Figure 4. Figure 4 is a diagram showing an example of the configuration of the light-receiving surface of the color wheel 370 in the light source device 30 of Figure 2.

[0045] As shown in Figure 4, the color wheel 370 is driven by a motor (not shown) and includes a disc-shaped transparent substrate 372 that rotates around a central shaft 371. The light-receiving surface 372a of the transparent substrate 372 shown in Figure 4 has dichroic layers 375G, 375R and an anti-reflective layer 375B formed thereon.

[0046] The transparent substrate 372 has three color light segments SR, SG, and SB in the circumferential direction. In this embodiment, the color light segment SB of the color wheel 370 has an angle corresponding to the opening region 355B (see Figure 3) of the phosphor wheel 350, and the color light segments SR and SG have angles corresponding to the phosphor layer regions 355R and 355G (see Figure 3), respectively, of the phosphor wheel 350.

[0047] On the light-receiving surface 372a of the transparent substrate 372, a dichroic layer 375R that transmits red light is formed in the color light segment SR, a dichroic layer 375G that transmits green light is formed in the color light segment SG, and an anti-reflective layer 375B that transmits blue light, which is the light source, is formed in the color light segment SB.

[0048] Furthermore, the color wheel 370 is controlled by the control unit 70 (see Figure 1) to rotate synchronously with the phosphor wheel 350 along the rotation direction B, around the rotation axis O2. Specifically, the dichroic layer 375R is on the optical axis Ob when the blue laser light, which is the excitation light incident on the phosphor wheel 350, is incident on the phosphor layer region 355R that emits red fluorescence light; the dichroic layer 375G is on the optical axis Ob when the blue laser light, which is the excitation light, is incident on the phosphor layer region 355G that emits green fluorescence light; and the anti-reflective layer 375B is on the optical axis Ob when the blue laser light is incident on the aperture region 355B. As a result, light in the red, green, and blue wavelength bands with excellent color purity is sequentially emitted and incident on the rod integrator 380.

[0049] Light in the red, green, and blue wavelength bands incident on the rod integrator 380 is reflected multiple times inside the rod integrator 380, resulting in a uniform light intensity distribution, and is emitted from the light source device 30 as white illumination light Li.

[0050] Although Figure 2 shows an example of a light source device 30 that includes both a phosphor wheel 350 and a color wheel 370, this disclosure is not limited to this. For example, the light source device 30 can be configured without including the color wheel 370. The light source device in the projection-type image display device according to this embodiment can be configured using various light source device arrangements known in the art. A detailed explanation thereof is omitted here.

[0051] (Attachment of phosphor wheel or color wheel) The mounting of the phosphor wheel or color wheel in the light source device of the projection-type image display device according to this embodiment will be described with reference to Figures 5 to 7. Figure 5 is a perspective view showing the mounting of the phosphor wheel 350. Figure 6 is a perspective view showing the mounting of the color wheel 370. Figure 7 is a side view showing the mounting of the phosphor wheel 350.

[0052] As shown in Figures 5 and 6, the phosphor wheel 350 and the color wheel 370 are attached to the support surface 450 of the phosphor wheel holder and the support surface 470 of the color wheel holder, respectively, by a rotating body mounting structure 500. In this embodiment, three rotating body mounting structures 500 are used to attach the phosphor wheel 350 or the color wheel 370, but this disclosure is not limited to the number of rotating body mounting structures used for attachment.

[0053] The details of the rotational configuration of the rotating body in the projection-type image display device 10 will be explained with reference to Figure 7, using the phosphor wheel 350 as an example. As shown in Figure 7, the phosphor wheel 350 comprises a substrate 352 and a motor 360. The phosphor wheel 350 is an example of a rotating body in this embodiment. The color wheel 370 has a rotational configuration substantially similar to that of the phosphor wheel 350, but differs from the substrate 352 of the phosphor wheel 350 (see Figure 3) in the configuration of the transparent substrate 372 (see Figure 4). A detailed explanation of the rotational configuration of the color wheel 370 will be omitted.

[0054] The substrate 352 of the phosphor wheel 350 is a disc-shaped metal substrate made of a thermally conductive material such as aluminum. An annular region including a phosphor layer region is formed on the light-receiving surface 352a of the substrate 352 (Figure 3). A motor 360 is attached to the surface 352b of the substrate 352 opposite to the light-receiving surface 352a. The substrate 352 constitutes the rotating surface of the phosphor wheel 350.

[0055] In this embodiment, the motor 360 consists of a rotor 361 and a stator 362. The rotor 361 is attached to the surface 352b of the substrate 352 of the phosphor wheel 350 and is integrally formed with the rotation surface of the phosphor wheel 350. The stator 362 supports the rotor 361 via a shaft 351. Driven by the motor 360, the substrate 352 of the phosphor wheel 350 and the rotor 361 can rotate together around the shaft 351 with respect to the rotation axis O1.

[0056] The motor 360 is attached to the support surface 450 of the phosphor wheel holder 400, which is a rotating body support, using the rotating body mounting structure 500 at the mounting surface 360a of the stator 362. The rotating body mounting structure 500 not only allows the phosphor wheel 350 to rotate stably by engaging with the phosphor wheel holder 400, but also enables accurate positioning in the direction of the rotation axis O1 and suppresses noise caused by vibrations during the operation of the rotating body. The configuration of the rotating body mounting structure 500 of this disclosure will be described below.

[0057] (Rotating body mounting structure) The configuration of the rotating body mounting structure 500 will be explained using Figures 8 to 10, with the mounting of the phosphor wheel 350 as an example. Figure 8 is an exploded perspective view showing the mounting of the phosphor wheel 350 using the rotating body mounting structure 500A according to Embodiment 1. Figure 9A is a cross-sectional view showing the configuration of the rotating body mounting structure 500A according to Embodiment 1. Figure 9B is a cross-sectional view showing the configuration of the rotating body mounting structure 500A1 according to a modified example of Embodiment 1. Figure 10 is a cross-sectional view showing the configuration of the rotating body mounting structure 500B according to Embodiment 2.

[0058] As shown in Figure 8, the motor 360 of the phosphor wheel 350 has a screw hole 365 formed on its mounting surface 360a, and the support surface 450 of the phosphor wheel holder 400 has a mounting hole 455 formed through it in the direction of the mounting axis O1a, which is parallel to the rotation axis of the phosphor wheel 350. The rotating body mounting structure 500A attaches the phosphor wheel 350 to the phosphor wheel holder 400 by screwing it into the screw hole 365 through the mounting hole 455 along the mounting axis O1a.

[0059] (Rotating body mounting structure according to Example 1) The rotating body mounting structure 500A according to Embodiment 1 comprises an elastic member 510 and a fixing member 520A, the fixing member 520A being composed of a sleeve 505 and a screw member 506. As shown in Figure 9A, the elastic member 510 has a through hole 515 in the direction of the mounting axis O1a, and the fixing member 520A is inserted into the through hole 515.

[0060] The elastic member 510 is fitted into the mounting hole 455 in the support surface 450 of the phosphor wheel holder 400 and interposed between the mounting surface 360a of the phosphor wheel 350 and the support surface 450 of the phosphor wheel holder 400. This dampens vibrations during rotation of the phosphor wheel 350, suppresses the transmission of vibrations to the phosphor wheel holder 400, and reduces noise caused by vibrations.

[0061] The elastic member 510 can be made of, for example, a bush made of an elastic material. The elastic material constituting the elastic member 510 can be selected such that its transmission coefficient to noise frequencies that may be generated by the rotation of the rotating body is sufficiently low. Furthermore, in selecting the elastic material constituting the elastic member 510, factors such as the operating environment of the rotating body can be considered, and an elastic material suitable for the operating environment can be adopted.

[0062] In this embodiment, in a projection-type image display device equipped with a phosphor wheel and a color wheel, noise around 3000 Hz is easily generated due to vibrations during rotation, depending on the rotation speed of the phosphor wheel and color wheel. Therefore, the elastic material constituting the elastic member 510 can be selected so that the transmission coefficient for noise frequencies around 3000 Hz is less than 1. Furthermore, a material can be used that has sufficient mechanical strength and heat resistance in the operating environment of the phosphor wheel and color wheel, and that undergoes relatively little alteration or deterioration due to exposure to light. In this embodiment, for example, the elastic member 510 can be constructed using a bush made of ACM rubber (acrylic rubber).

[0063] As shown in Figure 9A, the elastic member 510 has a through hole 515 formed in the direction of the mounting axis O1a, and the fixing member 520A is inserted into the through hole 515. The fixing member 520A is a rigid member made of a material including metal, for example, and may include a central portion 522A positioned within the through hole 515 in the direction of the mounting axis O1a, and a tip portion 521A on the mounting surface 360a side and a rear end portion 523A on the opposite side of the mounting surface 360a that are exposed from the through hole 515. The tip portion 521A of the fixing member 520A has a screw thread formed on it and can be screwed into a screw hole 365 on the mounting surface 360a of the motor 360. The central portion 522A and the rear end portion 523A of the fixing member 520A include two wall surfaces 500a and 500b that intersect with the mounting axis O1a direction, allowing for accurate screw positioning of the fixing member 520A, and also forming an interposing surface 500c between the mounting surface of the rotating body and the support surface of the support body, providing space for interposing the elastic member 510.

[0064] Specifically, as shown in Figure 9A, the fixing member 520A of the rotating body mounting structure 500A according to this embodiment is composed of a sleeve 505 and a screw member 506. The sleeve 505 has both ends 505a and 505b, and a through channel 525 in the direction of the mounting axis O1a is formed in the center. The end 505a of the sleeve 505 is insertable into the through hole 515 of the elastic member 510, while the end 505b has a large area in the direction intersecting the mounting axis O1a, is not insertable into the through hole 515, and is exposed from the through hole 515. The portion between both ends 505a and 505b is inserted into the through hole 515. Thus, in this embodiment, both ends 505a and 505b of the sleeve 505 constitute the two wall surfaces 500a and 500b of the fixing member 520A, and the portion between both ends 505a and 505b that is inserted into the through hole 515 forms the intervening surface 500c. Although not limited to this, in this embodiment, the wall surfaces 500a and 500b are configured to be approximately perpendicular to the mounting axis O1a direction.

[0065] The screw member 506 has a threaded tip 506a and a head 506b. The tip 506a is inserted into the through channel 525 from the end 505b of the sleeve 505 and is exposed from the sleeve 505 on the mounting surface 360a side. The head 506b is configured not to be inserted into the sleeve 505 and is exposed from the sleeve 505 on the opposite side of the mounting surface 360a. As shown in the figure, the screw member 506 can be inserted into the through channel 525 until the head 506b abuts against the end 505b of the sleeve 505. At this time, the tip 506a of the screw member 506 protrudes from the end 505a of the sleeve 505 and can be screwed into the screw hole 365 on the mounting surface 360a of the motor 360. Thus, in this embodiment, the tip 506a of the screw member 506 constitutes the tip portion 521A of the fixing member 520A.

[0066] With the tip 506a of the threaded member 506 screwed into the threaded hole 365 on the mounting surface 360a, as shown in Figure 9A, the sleeve 505 has its end 505a in contact with the mounting surface 360a on the wall surface 500a, and its end 500b in contact with the head 506b of the threaded member 506. At this time, the length L between the two ends 505a and 505b of the sleeve 505 allows for accurate screwing and positioning of the fixing member 520A in the direction of the mounting axis O1a.

[0067] When mounting optical rotating bodies such as phosphor wheels and color wheels to a support, it is desirable to mount them on the support surface so that the rotation surface of the rotating body is perpendicular to the rotation axis in order to ensure rotational stability and an accurate light propagation path. As shown in Figures 5 and 6, the phosphor wheel 350 and the color wheel 370 are mounted on the support 450 and 470 using multiple rotating body mounting structures 500. By aligning the screw-in positioning of each rotating body mounting structure, the rotation surface of the phosphor wheel and color wheel can be mounted perpendicular to the rotation axis. In this embodiment, by inserting a rigid member sleeve 505 into the elastic member 510 and positioning it in the direction of the mounting axis O1a, variations in dimensions due to individual differences in parts during processing and variations due to differences in tightening force during mounting can be suppressed, and the accuracy of positioning in the direction of the mounting axis O1a can be guaranteed. For example, in this embodiment, the length L between the two ends 505a and 505b of the sleeve 505 allows the phosphor wheel to be mounted with high precision such that the positioning tolerance in the mounting axis O1a direction is within ±0.1 mm.

[0068] Furthermore, as shown in Figure 9A, a space is formed between the mounting surface 360a of the motor 360 and the wall surface 500b of the end 505b of the sleeve 505, in which the elastic member 510 is interposed. The inner circumferential surface 510c of the through hole 515 of the elastic member 510 is positioned in contact with the interposing surface 500c formed by the portion of the sleeve 505 inserted into the through hole 515. In addition, a recess 511 is formed along the circumferential direction on the outer circumferential surface 510d of the elastic member 510, and the support member 456 around the mounting hole 455 of the support surface 450 is positioned to fit into the recess 511 of the outer circumferential surface 510d of the elastic member 510. The recess 511 can be configured in any shape, and this disclosure is not limited thereto. For example, the inner surface of the recess 511 may be a flat surface or a curved surface.

[0069] The elastic member 510 can be configured such that, for example, the length between both end faces 510a and 510b in the direction of the mounting axis O1a is greater than the length L between both ends 505a and 505b of the sleeve 505 in its natural state. As a result, when the tip 506a of the screw member 506 is screwed into the screw hole 365, the elastic member 510 is compressed between the mounting surface 360a of the motor 360 and the wall surface 500b of the end 505b of the sleeve in the direction of the mounting axis O1a. In this way, the mounting surface 360a of the phosphor wheel 350 and the support surface 450 of the phosphor wheel holder 400 can engage via the elastic member 510 without direct contact. This dampens vibrations during the rotation of the rotating body, suppresses the transmission of vibrations to the support, and reduces noise caused by vibrations.

[0070] Furthermore, in this embodiment, the sleeve 505 can be configured such that its end portion 505b has a diameter D1 larger than the diameter of the mounting hole 455. This allows the mounting surface 360a and the support member 456 to be stably engaged by the elastic member 510, which is compressed between the mounting surface 360a and the wall surface 500b of the end portion 505b of the sleeve.

[0071] The support member 456 can be fitted into the recess 511 on the outer peripheral surface 510d of the elastic member 510 at a depth T1. In this embodiment, for example, the depth T1 can be set to about 1 mm. This allows the support member 456 and the mounting surface 360a to be stably engaged via the elastic member 510. The outer peripheral surface 510d of the elastic member 510 may or may not be in contact with the support member 456 at the bottom surface 511a of the recess 511. This disclosure is not limited thereto.

[0072] Furthermore, in a direction perpendicular to the mounting axis O1a, the elastic member 510 can be configured to abut against the interposing surface 500c formed by the portion of the sleeve 505 inserted into the through hole 515, at the inner circumferential surface 510c of the through hole 515. This allows vibrations transmitted through the sleeve during the rotation of the rotating body to be dampened.

[0073] Furthermore, the portion of the screw member 506 inserted into the through channel 525 of the sleeve 505 between the tip 506a and the head 506b does not necessarily have threads formed on it. The outer diameter of the screw member 506 and the inner diameter of the through channel 525 of 505 can be dimensionally designed so that the portion of the screw member 506 inside the sleeve 505 partially contacts the inner wall of the through channel 525 or is in close proximity to each other. This makes it possible to suppress vibrations that may occur due to play in the sleeve of the screw member during the rotation of the rotating body. By using a sleeve 505 made of a rigid member, it is possible to suppress dimensional variations due to individual differences in parts during manufacturing and to guarantee the accuracy of the dimensional design between the outer diameter of the screw member 506 and the inner diameter of the through channel 525 of 505. In addition, an elastic material layer (not shown) can be provided inside the through channel 525 of the sleeve 505 so that the portion of the screw member 506 inside the sleeve 505 contacts the inner wall of the through channel 525 via the elastic material layer. This makes it possible to further suppress vibrations transmitted by the screw member.

[0074] In Embodiment 1 shown in Figure 9A, the end portion 505b of the sleeve 505 forms a wall surface 500b in a direction perpendicular to the mounting axis O1a, and contacts the elastic member 510 over a sufficient area, and together with the mounting surface 360a and the interposing surface 500c, it can provide a space for interposing the elastic member 510. However, the wall surface 500b is not limited to being formed by the end portion 505b of the sleeve 505. For example, the wall surface 500b can also be formed by the head of a screw member. This will be explained with reference to a modified example shown in Figure 9B.

[0075] (Mounting structure for a rotating body according to a modified example of Example 1) The rotating body mounting structure 500A1, a modified example of Embodiment 1 shown in Figure 9B, comprises an elastic member 510 and a fixing member 520A1. The elastic member 510 has a similar configuration to the elastic member of the rotating body mounting structure 500A shown in Figure 9A, while the configuration of the fixing member 520A1 differs from that of the rotating body mounting structure 500A.

[0076] The fixing member 520A1 of the rotating body mounting structure 500A1 is composed of a sleeve 507 and a threaded member 508. The sleeve 507 has both ends 507a and 507b, and a through channel 527 in the direction of the mounting axis O1a is formed in the center. The sleeve 507 has both ends 507a and 507b which are roughly the same shape and is substantially cylindrical, and the entire sleeve 507 is inserted into the through hole 515 of the elastic member 510 to form the central part 522A1 of the fixing member 520A1 and form the interposing surface 500c.

[0077] As shown in Figure 9B, the screw member 508 of the rotating body mounting structure 500A1 has a threaded tip 508a and a head 508b. The tip 508a is inserted into the through channel 527 from the end 507b of the sleeve 507 and is exposed from the sleeve 507 on the mounting surface 360a side. The head 508b has a large area in the direction intersecting the mounting axis O1a direction, is configured not to be inserted into the sleeve 507, and is exposed from the sleeve 507 on the opposite side of the mounting surface 360a. As shown in the figure, the screw member 508 can be inserted into the through channel 527 until the head 508b abuts against the end 507b of the sleeve 507. At this time, the tip 508a of the screw member 508 protrudes from the end 507a of the sleeve 507 and can be screwed into the screw hole 365 on the mounting surface 360a of the motor 360. The head 508b of the screw member 508 forms a wall surface 500b in a direction perpendicular to the mounting axis O1a, and contacts the elastic member 510 over a sufficient area, and together with the mounting surface 360a and the interposing surface 500c, it can provide a space for interposing the elastic member 510.

[0078] The elastic member 510 can be configured such that, for example, the length between both end faces 510a and 510b in the direction of the mounting axis O1a is greater than the length L between both ends 507a and 507b of the sleeve 507 in its natural state. As a result, when the tip 508a of the screw member 508 is screwed into the screw hole 365, the elastic member 510 is compressed between the mounting surface 360a of the motor 360 and the head 508b of the screw member 508 in the direction of the mounting axis O1a. In this way, the mounting surface 360a of the phosphor wheel 350 and the support surface 450 of the phosphor wheel holder 400 can engage via the elastic member 510 without direct contact. This dampens vibrations during the rotation of the rotating body, suppresses the transmission of vibrations to the support, and reduces noise caused by vibrations.

[0079] Furthermore, in this embodiment, the screw member 508 can be configured such that the head 508b has a diameter D2 that is larger than the diameter of the mounting hole 455. This allows the mounting surface 360a and the support member 456 to be stably engaged by the elastic member 510 that is compressed between the mounting surface 360a and the wall surface 500b of the head 508b.

[0080] The other components of the rotating body mounting structure 500A1 are the same as those of the rotating body mounting structure 500A shown in Figure 9A, so a detailed explanation is omitted.

[0081] (Rotating body mounting structure according to Example 2) Next, with reference to Figure 10, the rotating body mounting structure 500B according to Embodiment 2 will be described. The rotating body mounting structure 500B comprises an elastic member 510 and a fixing member 520B. The elastic member 510 has a configuration similar to the elastic member of the rotating body mounting structure 500A shown in Figure 9A, while the configuration of the fixing member 520B differs from that of the rotating body mounting structure 500A.

[0082] The fixing member 520B of the rotating body mounting structure 500B is integrally constructed and inserted as a single component into the through hole 515 of the elastic member 510. The fixing member 520B is made of a rigid member, for example, a material including metal, and may include a central portion 522B positioned within the through hole 515 in the direction of the mounting axis O1a, and a tip portion 521B on the mounting surface 360a side and a rear end portion 523B on the opposite side of the mounting surface 360a that are exposed from the through hole 515. The tip portion 521B of the fixing member 520B has a screw thread formed on it and can be screwed into a screw hole 365 on the mounting surface 360a of the motor 360. The central portion 522B and the rear end portion 523B of the fixing member 520B include two wall surfaces 500a1 and 500b1 that intersect with the mounting axis O1a direction, allowing for accurate screw positioning of the fixing member 520B in the mounting axis O1a direction, and also forming an interposing surface 500c1 between the mounting surface of the rotating body and the support surface of the support body, providing space for interposing the elastic member 510.

[0083] Specifically, as shown in Figure 10, the fixing member 520B of the rotating body mounting structure 500B according to this embodiment is composed of a threaded portion 520a, an enlarged diameter portion 520b, and a wall end portion 520c. The enlarged diameter portion 520b is located between the threaded portion 520a and the wall end portion 520c and is composed of a cylindrical portion having an outer diameter d2 that is larger than the outer diameter d1 of the threads of the threaded portion 520a. The wall end portion 520c is configured to have a diameter d3 that is larger than the outer diameter d2 of the enlarged diameter portion 520b. The enlarged diameter portion 520b also has a first end 520b1 at the boundary with the threaded portion 520a and a second end 520b2 at the boundary with the wall end portion 520c, with a length L between the first end 520b1 and the second end 520b2.

[0084] The integrally constructed fixing member 520B is inserted into the through hole 515 of the elastic member 510, the threaded portion 520a is screwed into the mounting surface 360a through the through hole 515 of the elastic member 510, and the enlarged diameter portion 520b is inserted into the through hole 515 to form an interposing surface 500c1. Furthermore, at the boundary between the threaded portion 520a and the enlarged diameter portion 520b, the first end 520b1 forms a wall surface 500a1, and the wall surface end 520c forms a wall surface 500b1 at the boundary with the enlarged diameter portion 520b. The wall surface 500b1 has a sufficient area and, together with the mounting surface 360a and the interposing surface 500c1, can provide space for interposing the elastic member 510. Although not limited thereto, in this embodiment, the wall surfaces 500a1 and 500b1 are configured to be approximately perpendicular to the mounting axis O1a direction.

[0085] When the threaded portion 520a is screwed into the threaded hole 365 on the mounting surface 360a, as shown in Figure 10, the first end 520b1 at the boundary between the enlarged diameter portion 520b and the threaded portion 520a abuts against the mounting surface 360a on the wall surface 500a1, and the length L of the enlarged diameter portion 520b allows for accurate screwing and positioning of the fixing member 520B in the direction of the mounting axis O1a.

[0086] Furthermore, as shown in Figure 10, a space is formed between the mounting surface 360a of the motor 360 and the wall surface 500b1 of the wall end 520c in which the elastic member 510 is interposed. The inner circumferential surface 510c of the through hole 515 of the elastic member 510 can be positioned in contact with the interposing surface 500c1 formed by the enlarged diameter portion 520b inserted into the through hole 515. In addition, a recess 511 is formed along the circumferential direction on the outer circumferential surface 510d of the elastic member 510, and the support member 456 around the mounting hole 455 of the support surface 450 is positioned to fit into the recess 511 of the outer circumferential surface 510d of the elastic member 510. The recess 511 can be configured in any shape, and this disclosure is not limited thereto. For example, the inner surface of the recess 511 may be a flat surface or a curved surface.

[0087] The elastic member 510 can be configured such that, for example, the length between both end faces 510a and 510b in the direction of the mounting axis O1a is greater than the length L of the enlarged diameter portion 520b in its natural state. As a result, when the threaded portion 520a is screwed into the threaded hole 365, the elastic member 510 is compressed between the mounting surface 360a of the motor 360 and the wall surface 500b1 of the wall end portion 520c in the direction of the mounting axis O1a. In this way, the mounting surface 360a of the phosphor wheel 350 and the support surface 450 of the phosphor wheel holder 400 can engage via the elastic member 510 without direct contact. This dampens vibrations during the rotation of the rotating body, suppresses the transmission of vibrations to the support, and reduces noise caused by vibrations.

[0088] Furthermore, in this embodiment, the fixing member 520B can be configured such that the wall end portion 520c has a diameter d3 that is larger than the diameter of the mounting hole 455. This allows the mounting surface 360a and the support member 456 to be stably engaged by the elastic member 510 that is compressed between the mounting surface 360a and the wall surface 500b1 of the wall end portion 520c.

[0089] The support member 456 can be fitted into the recess 511 on the outer peripheral surface 510d of the elastic member 510 at a depth T2. In this embodiment, for example, the depth T2 can be set to about 1 mm. This allows the support member 456 and the mounting surface 360a to be stably engaged via the elastic member 510. The outer peripheral surface 510d of the elastic member 510 may or may not be in contact with the support member 456 at the bottom surface 511a of the recess 511. The disclosure is not limited thereto.

[0090] Furthermore, in a direction perpendicular to the mounting axis O1a, the elastic member 510 can be configured to abut against the interposing surface 500c1 formed by the enlarged diameter portion 520b inserted into the through hole 515, at the inner circumferential surface 510c of the through hole 515. This allows vibrations transmitted through the fixed member 520B during the rotation of the rotating body to be dampened.

[0091] Thus, the rotating body mounting structure according to this disclosure can suppress noise caused by vibrations during the rotation of the rotating body by engaging the mounting surface of the rotating body with the support surface of the support body via an elastic member, thereby enabling quiet operation of the device equipped with the rotating body. Furthermore, it is possible to precisely screw-mount the rotating body in the axial direction of the rotation axis of the rotating body, and to mount the optical rotating body so that the rotation surface of the rotating body is perpendicular to the rotation axis, thereby ensuring rotational stability and an accurate optical propagation path.

[0092] To verify the noise suppression effect of the rotating body mounting structure according to the embodiment of this disclosure, noise measurements were performed on a projection-type image display device equipped with a phosphor wheel and a color wheel during operation. The noise measurement procedure for the projection-type image display device according to the embodiment of this disclosure will be described below with reference to Figures 11 to 12B.

[0093] (Noise measurement of projection-type image display devices) Figure 11 is a schematic diagram showing the noise measurement setup for the projection-type image display device 100. This measurement was performed in accordance with ISO 7779, the measurement standard for airborne noise radiated from acoustic-information technology equipment.

[0094] The projection-type image display device 100 to be measured is equipped with a light source device 30 including a phosphor wheel 350 and a color wheel 370 as shown in Figure 2. The phosphor wheel of the light source device 30 has the basic configuration shown in Figure 3 and a diameter of approximately 73 mm, and the color wheel has the basic configuration shown in Figure 4 and a diameter of approximately 80 mm. The noise of the projection-type image display device 100 during operation was measured when these phosphor wheels and color wheels were attached to the rotating body support in direct contact with conventional screw parts, and when they were attached to the rotating body support using the rotating body mounting structure 500A according to Embodiment 1 of this disclosure. The elastic member of the rotating body mounting structure 500A was constructed using an ACM rubber bush.

[0095] The noise level of the projection-type image display device 100 during operation was measured using measuring instruments conforming to IEC60651 or IEC60684-1. During the measurement, the projection-type image display device 100 was placed in the center of a measuring stand specified in Appendix A of ISO7779, and the airborne noise signal radiated from the projection-type image display device 100 was received by a receiver 80 including a microphone. The receiver 80 was positioned facing the projection-type image display device 100 at a horizontal distance M of approximately 1 m and a height distance H of approximately 0.75 m, with a downward tilt angle θ of approximately 30 degrees from the horizontal plane.

[0096] Measurements were taken in four directions: front, back, left, and right of the projection-type image display device 100. Using the ambient noise-corrected measurement values ​​L1, L2, L3, and L4 obtained in the four directions, the noise sound pressure values ​​were calculated using the following formula (1).

[0097]

number

[0098] Figures 12A and 12B show the analysis results of the noise sound pressure values ​​calculated from measurements taken for the phosphor wheel and the color wheel, respectively. Figure 12A is a graph showing the noise measurement results due to vibration during rotation of the phosphor wheel, and Figure 12B is a graph showing the noise measurement results due to vibration during rotation of the color wheel. In Figures 12A and 12B, the noise sound pressure when the phosphor wheel or color wheel is mounted to a support in direct contact with a conventional screw part is shown by a dashed line, and the noise sound pressure when it is mounted to a support using the rotating body mounting structure 500A according to Embodiment 1 of this disclosure is shown by a solid line.

[0099] As shown in Figure 12A, when the phosphor wheel was mounted to the support using a conventional mounting structure, in direct contact with the screw component, the sound pressure of the noise around 3000 Hz had a peak value V1 of approximately 27.5 dB. In contrast, when the phosphor wheel was mounted to the support via an elastic member without direct contact with the screw component, using the rotating mounting structure of this disclosure, the sound pressure of the noise around 3000 Hz had a peak value V2 of approximately 15.5 dB. Compared to the conventional mounting structure, using the rotating mounting structure of this disclosure reduced the noise around 3000 Hz caused by the vibration of the phosphor wheel to approximately 56.4% of the conventional level.

[0100] Next, as shown in Figure 12B, when the color wheel was attached to the support using a conventional mounting structure, in direct contact with the screw component, the sound pressure of the noise around 3000 Hz had a peak value V3 of approximately 19.0 dB. In contrast, when the phosphor wheel was attached to the support via an elastic member without direct contact with the screw component, using the rotating mounting structure of this disclosure, the sound pressure of the noise around 3000 Hz had a peak value V4 of approximately 12.5 dB. Compared to the conventional mounting structure, using the rotating mounting structure of this disclosure reduced the noise around 3000 Hz caused by vibration of the color wheel to approximately 65.8% of the conventional level.

[0101] Thus, it has become clear that noise caused by vibrations during rotation can be suppressed by using the rotating body mounting structure of this disclosure to mount phosphor wheels or color wheels.

[0102] In addition, while the present disclosure of a rotating body mounting structure has been explained using phosphor wheels and color wheels as examples of rotating bodies, and verification was mainly conducted on noise suppression around a frequency of 3000 Hz, the present disclosure is not limited to these. The present disclosure of a rotating body mounting structure is not limited to phosphor wheels and color wheels, nor is it limited to optical rotating bodies, but can generally be used to mount various rotating bodies in rotating equipment such as electric fans, agitators, and other rotating devices. Furthermore, by configuring the present disclosure of a rotating body mounting structure with elastic members suitable for the operating environment of various rotating bodies, it is possible to suppress noise of different frequencies caused by vibrations during the rotation of various rotating bodies.

[0103] As described above, the attached drawings and detailed description are provided to illustrate the embodiments of the technology described herein. Therefore, the components described in the attached drawings and detailed description may include not only components essential for solving the problem, but also components that are not essential for solving the problem, in order to illustrate the technology described above. Therefore, the mere presence of such non-essential components in the attached drawings and detailed description should not be immediately assumed to mean that those non-essential components are essential.

[0104] While this disclosure is fully described in relation to preferred embodiments with reference to the accompanying drawings, various modifications are possible within the scope of the claims. Such modifications, as well as embodiments obtained by appropriately combining the technical means disclosed in different embodiments, are also included in the technical scope of this disclosure. [Industrial applicability]

[0105] This disclosure is applicable to structures for mounting various rotating bodies, and is applicable, for example, to devices using optical rotating bodies such as phosphor wheels and color wheels. [Explanation of Symbols]

[0106] 10,100 Projection-type image display device 30 Light source device 40 Light guide optical system 50 Projection light generation section 60 projection optical system 70 Control Unit 80 Receiver 301 Laser light source 310 Dichroic Mirror 321, 322, 323 Focusing lenses 311, 312, 313 Miller 331,332,333 lenses 350 Phosphor Wheel 351 shaft 352 circuit boards 360 motor 360a Mounting surface 361 Rotor 362 Stator 365 screw holes 370 Color Wheel 371 Shaft 372 Transparent substrate 380 Rod Integrator 400 Phosphor Wheel Holder 450,470 Support surface 455 mounting holes 456 Support member 500, 500A, 500A1, 500B Rotating Body Mounting Structure 500a, 500b Wall surface 500c interposition surface 510 Elastic member 511 recess 515 Through hole 520A, 520A1, 520B Fixing Members 520a Threaded section 520b Expanded section 520c wall end 505,507 sleeves 506, 508 Screw components 525,527 Through-channel Oa,Ob Optical axis O1, O2 rotation axis O1a mounting shaft

Claims

1. A rotating body mounting structure for mounting a rotating body having a hole formed in its mounting surface to a support having a mounting hole that penetrates in the axial direction of the rotating shaft of the rotating body, An elastic member having the aforementioned axial through hole and fitted into the mounting hole, A fixing member comprising a first portion that contacts the elastic member and is inserted into the through hole, and a tip portion that is inserted into the hole and fixed, Equipped with, Rotating body mounting structure.

2. The fixing member further includes a rear end portion exposed from the through hole on the opposite side of the mounting surface, The aforementioned rear end portion includes a first wall surface that intersects with the axial direction, With the tip portion fixed in the hole, the elastic member is compressed between the mounting surface and the first wall surface. The rotating body mounting structure according to claim 1.

3. The first portion includes a second wall surface at an end adjacent to the tip portion that intersects the axial direction, With the tip portion fixed in the hole, the second wall surface abuts against the mounting surface. The rotating body mounting structure according to claim 2.

4. The hole is a screw hole, The fixing member includes a sleeve and a screw member, a portion of which is inserted into the sleeve. The sleeve is positioned in contact with the elastic member. The rotating body mounting structure according to claim 1.

5. The sleeve comprises the first portion and a second portion exposed from the through hole on the opposite side of the mounting surface, The screw member includes the tip portion and the head portion that is exposed from the sleeve on the opposite side of the mounting surface. In the state in which the tip portion of the screw member is screwed into the screw hole, the second portion of the sleeve constitutes a first wall surface intersecting the axial direction, and the elastic member is compressed between the mounting surface and the first wall surface. The rotating body mounting structure according to claim 4.

6. The sleeve constitutes the first part, The screw member includes the tip portion and the head portion that is exposed from the sleeve on the opposite side of the mounting surface. In the state in which the tip portion of the screw member is screwed into the screw hole, the head constitutes a first wall surface intersecting the axial direction, and the elastic member is compressed between the mounting surface and the first wall surface. The rotating body mounting structure according to claim 4.

7. With the tip portion screwed into the screw hole, the sleeve abuts the mounting surface with the first portion and abuts the head with the second portion. The rotating body mounting structure according to claim 5.

8. The hole is a screw hole, The aforementioned fixing member is constructed as a single unit, The aforementioned tip portion includes screw threads, The first portion has a first cross-section that is larger than the tip portion in a direction intersecting the axial direction, The first wall surface is larger than the first cross-section. The rotating body mounting structure according to claim 2.

9. In the state in which the tip portion is screwed into the screw hole, the first portion abuts the mounting surface at the end adjacent to the tip portion. The rotating body mounting structure according to claim 8.

10. The elastic member has a recess formed along the circumferential direction on its outer surface, The support member around the mounting hole is fitted into the recess. The rotating body mounting structure according to claim 1 or 2.

11. The aforementioned fixing member is made of a material including metal. The rotating body mounting structure according to claim 1 or 2.

12. The elastic member is made of a material including ACM rubber. The rotating body mounting structure according to claim 1 or 2.

13. The rotating body constitutes a phosphor wheel that converts incident light into light of different wavelengths and emits it, or a color wheel that transmits incident light through multiple color bands and emits it. The rotating body mounting structure according to claim 1 or 2.

14. A light source that emits incident light, A phosphor wheel that converts the incident light into light of different wavelengths and emits it, or a color wheel that transmits and emits incident light in multiple color bands, mounted using the rotating body mounting structure described in claim 1 or 2, Equipped with, Light source device.

15. The light source device according to claim 14, A projection light generation unit that generates projection light according to the video signal, A light guide optical system that guides illumination light emitted from the light source device to the projection light generation unit, A projection optical system that displays an image by magnifying and projecting the projection light from the projection light generation unit, Equipped with, Projection-type image display device.

Images