JP2017072670A - Wavelength converter, illumination apparatus and projector - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a wavelength converter capable of preventing generation of face deflection and/or eccentricity at a low cost, and an illumination apparatus and a projector.SOLUTION: A rotating fluorescent plate 30 includes: a motor 50; a disc 40 which is driven to rotate by the motor 50; a fluorescent body layer formed over the disc 40; and a heat sink 51 formed different from the disc 40. The motor 50 has a hub 55 which rotates on a rotation axis 50a. The disc 40 has a first opening 43 which engages with the hub 55. The heat sink 51 has a second opening 54 which engages with the hub 55. At least a part of a first inner wall 43a which forms the first opening 43 is in surface contact with a peripheral surface 55a of the hub 55, and at least a part of a second inner wall 54a which forms a second opening 54 is in surface contact with the peripheral surface 55a of the hub 55.SELECTED DRAWING: Figure 3

Description

  The present invention relates to a wavelength conversion device, an illumination device, and a projector.

  In recent years, phosphors have been used as illumination devices for projectors.

  In the illuminating device of the following patent document 1, the cooling fin is provided in the back surface of the base material which supports fluorescent substance. The base material and the cooling fin are integrally formed.

JP 2012-013897 A

  By the way, the surface of the base material that supports the phosphor is required to have high-precision planar roughness and flatness. In the above prior art, when the base material and the cooling fin are integrally formed, a manufacturing method such as die casting must be adopted. Therefore, in order to obtain the required planar roughness and flatness, secondary processing such as polishing is performed. Processing was necessary and the cost increased.

  On the other hand, when the base material and the cooling fin are separated, each of the base material and the cooling fin must be assembled with high accuracy to the rotating motor hub. When the assembly accuracy of the base material and the cooling fin is poor, surface blurring and eccentricity occur, and it becomes difficult to efficiently extract excitation light from the phosphor.

  The present invention has been made in view of such circumstances, and an object of the present invention is to provide a wavelength conversion device, an illumination device, and a projector that can reduce costs and suppress occurrence of surface blurring and eccentricity.

  According to the first aspect of the present invention, a rotating device, a base material rotated by the rotating device, a wavelength conversion element provided on the base material, a heat sink provided separately from the base material, The rotating device has a hub that rotates about a rotation axis, the base has a first opening that fits into the hub, and the heat sink fits into the hub. A second opening has a second opening, and at least a part of a first inner wall surface forming the first opening is in surface contact with the peripheral surface of the hub, and the second opening is formed. There is provided a wavelength conversion device in which at least a part of the inner wall surface of 2 is in surface contact with the peripheral surface of the hub.

  According to the wavelength conversion device according to the first aspect, since the base material and the heat sink are separate bodies, there is no need to manufacture them using die casting or the like. Therefore, the manufacturing cost can be suppressed and the cost can be reduced. The base member has a first opening that fits into the hub of the rotating device, and at least a part of the first inner wall surface forming the first opening is in surface contact with the peripheral surface of the hub. To do. Furthermore, the heat sink has a second opening that fits into the hub of the rotating device, and at least a part of the second inner wall surface that forms the second opening is in surface contact with the peripheral surface of the hub. . In this way, the first inner wall surface and the second inner wall surface are in surface contact with the peripheral surface of the hub with a predetermined width, respectively, so that the base material and the heat sink can be assembled to the hub with high accuracy without tilting. Therefore, occurrence of surface blurring and eccentricity can be suppressed, and light can be efficiently extracted from the wavelength conversion element.

Moreover, the said 1st aspect WHEREIN: The structure that the said 1st opening part and the said 2nd opening part have the same diameter is employ | adopted.
According to this configuration, since the first opening and the second opening have the same diameter, the base material and the heat sink can be assembled to the hub with substantially the same pressure.

Further, in the first aspect, the first inner wall surface and the second inner wall surface include a plurality of notch portions extending along the axial direction of the rotating shaft and spaced apart in the circumferential direction of the rotating shaft. The structure of having is adopted.
According to this configuration, since the first inner wall surface and the second inner wall surface have a plurality of cutout portions extending in the axial direction of the rotating shaft at intervals in the circumferential direction of the rotating shaft, the base material and the heat sink are provided. It can be assembled to the hub with a light pressure, and the deformation of components that occurs during assembly can be suppressed.

In the first aspect, the first inner wall surface is in surface contact with the peripheral surface of the hub with a first width in the axial direction of the rotating shaft, and the second inner wall surface is formed on the hub. A configuration is adopted in which the surface is in surface contact with a second width larger than the first width in the axial direction of the rotation shaft.
According to this configuration, since the second width of the second inner wall surface that is in surface contact with the peripheral surface of the hub in the axial direction of the rotation shaft is larger than the first width of the first inner wall surface, In addition, a heat sink having a large volume and weight and having a large influence on occurrence of surface blurring and eccentricity can be attached to the hub with high accuracy.

In the first aspect, the heat sink includes a flat plate and a plurality of fins, and the flat plate includes a thin portion provided with the plurality of fins, and a thick portion provided with the second opening, The structure of having is adopted.
According to this configuration, the flat plate of the heat sink is provided with the thin portion where the plurality of fins are provided and the thick portion where the second opening is provided, so the second inner wall surface is in the axial direction of the rotating shaft. It is possible to ensure a large width in surface contact with the peripheral surface of the hub.

Moreover, the said 1st aspect WHEREIN: The structure of having a reflective member provided between the said wavelength conversion element and the said base material is employ | adopted.
According to this configuration, a reflective wavelength conversion device is provided.

Moreover, the said 1st aspect WHEREIN: The structure that the said base material is formed of the translucent member is employ | adopted.
According to this configuration, a transmission type wavelength converter is provided.

  According to the second aspect of the present invention, the light source that emits the light in the first wavelength band and the first aspect that receives the light in the first wavelength band and emits the light in the second wavelength band. A wavelength conversion device according to the above is provided.

  Since the illuminating device according to the second aspect includes the wavelength conversion device according to the first aspect, it is possible to realize cost reduction and suppression of surface blurring and eccentricity, and generate bright illumination light.

  According to a third aspect of the present invention, the illumination device according to the second aspect, a light modulation device that forms image light by modulating illumination light from the illumination device according to image information, and the image light And a projection optical system for projecting the projector.

  Since the projector according to the third aspect includes the illuminating device according to the second aspect, it is possible to realize cost reduction and suppression of surface blurring and eccentricity, and display bright and excellent in image quality.

It is a top view which shows the optical system of the projector which concerns on this embodiment. It is the (a) fluorescent substance layer side block diagram of the rotation fluorescent plate which concerns on this embodiment, (b) The heat sink side block diagram. It is a disassembled perspective view which shows the structure of the rotation fluorescent screen which concerns on this embodiment. It is sectional drawing of the rotation fluorescent screen which concerns on this embodiment. It is a block diagram of the heat sink which concerns on another embodiment. It is a block diagram of the disc which concerns on another embodiment. It is sectional drawing of the rotation fluorescent screen which concerns on another embodiment.

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.
In addition, in the drawings used in the following description, in order to make the features easy to understand, there are cases where the portions that become the features are enlarged for the sake of convenience, and the dimensional ratios of the respective components are not always the same as the actual ones. Absent.

  An example of the projector according to the present embodiment will be described. The projector 1 of the present embodiment is a projection type image display device that displays a color image on a screen SCR (surface to be projected).

FIG. 1 is a top view showing an optical system of a projector 1 according to the present embodiment.
As shown in FIG. 1, the projector 1 includes a first illumination device 100 (illumination device), a second illumination device 102, a color separation light guide optical system 200, and liquid crystals corresponding to each color light of red light, green light, and blue light. A light modulation device 400R, 400G, 400B (light modulation device), a cross dichroic prism 500, and a projection optical system 600 are provided.

  The first illumination device 100 includes a first light source 10 (light source), a collimating optical system 70, a dichroic mirror 80, a collimating condensing condensing optical system 90, a rotating fluorescent plate 30 (wavelength conversion device), a first lens array 120, and a second lens array. 130, a polarization conversion element 140, and a superimposing lens 150.

The first light source 10 is composed of a semiconductor laser (light emitting element) that emits blue light (peak of emission intensity: about 445 nm) E in the first wavelength band composed of laser light as excitation light. The first light source 10 may be composed of one semiconductor laser or may be composed of a large number of semiconductor lasers.
The first light source 10 may be a semiconductor laser that emits blue light having a wavelength other than 445 nm (for example, 460 nm).

In the present embodiment, the first light source 10 is arranged so that the optical axis is orthogonal to the illumination optical axis 100ax.
The collimating optical system 70 includes a first lens 72 and a second lens 74, and makes the light from the first light source 10 substantially parallel. The first lens 72 and the second lens 74 are convex lenses.

  The dichroic mirror 80 is disposed in the optical path from the collimating optical system 70 to the collimating condensing optical system 90 so as to intersect with each of the optical axis of the first light source 10 and the illumination optical axis 100ax at an angle of 45 °. Yes. The dichroic mirror 80 reflects blue light and transmits yellow fluorescence including red light and green light.

  The collimator condensing optical system 90 substantially parallelizes the function of causing the blue light E from the dichroic mirror 80 to enter the phosphor layer 42 of the rotating fluorescent plate 30 in a substantially condensed state and the fluorescence emitted from the rotating fluorescent plate 30. With functions. The collimator condensing optical system 90 includes a first lens 92 and a second lens 94. The first lens 92 and the second lens 94 are convex lenses.

  The rotating fluorescent plate 30 includes a motor 50 (rotating device), a disc 40 (base material), a reflecting film 41 (reflecting member), a phosphor layer (wavelength conversion element) 42, and a heat sink 51. The phosphor layer 42 is excited by the blue light E having the first wavelength from the first light source 10 and emits the fluorescence Y having the second wavelength band. The surface of the phosphor layer 42 on which the blue light E is incident is also an emission surface from which the fluorescence Y is emitted. The fluorescence Y is yellow light including red light and green light.

  The second illumination device 102 includes a second light source 710, a condensing optical system 760, a scattering plate 732, and a collimating optical system 770.

The second light source 710 is composed of the same semiconductor laser as the first light source 10 of the first lighting device 100.
The condensing optical system 760 includes a first lens 762 and a second lens 764. The condensing optical system 760 condenses the blue light from the second light source 710 near the scattering plate 732. The first lens 762 and the second lens 764 are convex lenses.

  The scattering plate 732 scatters the blue light B from the second light source 710 to obtain blue light B having a light distribution similar to the light distribution of fluorescence Y emitted from the rotating fluorescent plate 30. As the scattering plate 732, for example, polished glass made of optical glass can be used.

  The collimating optical system 770 includes a first lens 772 and a second lens 774, and makes the light from the scattering plate 732 substantially parallel. The first lens 772 and the second lens 774 are convex lenses.

  In the present embodiment, the blue light B from the second illumination device 102 is reflected by the dichroic mirror 80 and is combined with the fluorescence Y emitted from the rotating fluorescent plate 30 and transmitted through the dichroic mirror 80 to become white light W. The white light W is incident on the first lens array 120.

  The first lens array 120 includes a plurality of first small lenses 122 for dividing the light from the dichroic mirror 80 into a plurality of partial light beams. The plurality of first small lenses 122 are arranged in a matrix in a plane orthogonal to the illumination optical axis 100ax.

  The second lens array 130 has a plurality of second small lenses 132 corresponding to the plurality of first small lenses 122 of the first lens array 120. The second lens array 130 forms an image of each first small lens 122 of the first lens array 120 together with the superimposing lens 150 in the vicinity of the image forming area of the liquid crystal light modulators 400R, 400G, and 400B. The plurality of second small lenses 132 are arranged in a matrix in a plane orthogonal to the illumination optical axis 100ax.

The polarization conversion element 140 converts each partial light beam divided by the first lens array 120 into linearly polarized light. The polarization conversion element 140 includes a polarization separation layer, a reflection layer, and a retardation plate. The polarization separation layer transmits one linearly polarized light component as it is among the polarized light components included in the light from the rotating fluorescent plate 30 and reflects the other linearly polarized light component toward the reflecting layer.
The reflective layer reflects the other linearly polarized light component reflected by the polarization separation layer in a direction parallel to the illumination optical axis 100ax. The phase difference plate converts the other linearly polarized light component reflected by the reflective layer into one linearly polarized light component.

  The superimposing lens 150 condenses the partial light beams from the polarization conversion element 140 and superimposes them on each other in the vicinity of the image forming regions of the liquid crystal light modulation devices 400R, 400G, and 400B. The first lens array 120, the second lens array 130, and the superimposing lens 150 constitute an integrator optical system that makes the in-plane light intensity distribution of the light from the rotating fluorescent plate 30 uniform.

The color separation light guide optical system 200 includes dichroic mirrors 210 and 220, reflection mirrors 230, 240 and 250, and relay lenses 260 and 270. The color separation light guide optical system 200 separates the white light W from the first illumination device 100 and the second illumination device 102 into red light R, green light G, and blue light B, and red light R, green light G, and blue color. The light B is guided to the liquid crystal light modulation devices 400R, 400G, and 400B, respectively.
Field lenses 300R, 300G, and 300B are disposed between the color separation light guide optical system 200 and the liquid crystal light modulation devices 400R, 400G, and 400B.

The dichroic mirror 210 is a dichroic mirror that transmits a red light component and reflects a green light component and a blue light component.
The dichroic mirror 220 is a dichroic mirror that reflects a green light component and transmits a blue light component.
The reflection mirror 230 is a reflection mirror that reflects a red light component.
The reflection mirrors 240 and 250 are reflection mirrors that reflect blue light components.

The red light that has passed through the dichroic mirror 210 is reflected by the reflecting mirror 230, passes through the field lens 300R, and enters the image forming region of the liquid crystal light modulation device 400R for red light.
The green light reflected by the dichroic mirror 210 is further reflected by the dichroic mirror 220, passes through the field lens 300G, and enters the image forming area of the liquid crystal light modulation device 400G for green light.
The blue light that has passed through the dichroic mirror 220 passes through the relay lens 260, the incident-side reflection mirror 240, the relay lens 270, the emission-side reflection mirror 250, and the field lens 300B, and the image formation region of the liquid crystal light modulation device 400B for blue light Is incident on.

  Each of the liquid crystal light modulation devices 400R, 400G, and 400B modulates incident color light according to image information to form an image corresponding to each color light. Although not shown, an incident-side polarizing plate is disposed between each field lens 300R, 300G, 300B and each liquid crystal light modulator 400R, 400G, 400B, and each liquid crystal light modulator 400R, 400G. , 400B and the cross dichroic prism 500 are each provided with an exit-side polarizing plate.

  The cross dichroic prism 500 is an optical element that synthesizes the image lights emitted from the liquid crystal light modulators 400R, 400G, and 400B to form a color image.

  The cross dichroic prism 500 has a substantially square shape in plan view in which four right-angle prisms are bonded together, and a dielectric multilayer film is formed on a substantially X-shaped interface in which the right-angle prisms are bonded together.

  The color image emitted from the cross dichroic prism 500 is enlarged and projected by the projection optical system 600 to form an image on the screen SCR.

Next, the configuration of the rotating fluorescent plate 30 will be described with reference to FIGS.
FIG. 2 is a (a) configuration diagram on the phosphor layer 42 side of the rotating phosphor plate 30 according to the present embodiment, and (b) a configuration diagram on the heat sink 51 side. FIG. 3 is an exploded perspective view showing the configuration of the rotating fluorescent plate 30 according to the present embodiment. FIG. 4 is a cross-sectional view of the rotating fluorescent plate 30 according to the present embodiment.

  The rotating fluorescent plate 30 rotates a disc 40 having a phosphor layer 42 by a motor 50. The motor 50 is, for example, an outer rotor type motor. As shown in FIG. 2A, the phosphor layer 42 is provided along the circumferential direction of the first surface 40 a of the disc 40. As shown in FIG. 2B, the heat sink 51 is provided on the second surface 40 b opposite to the first surface 40 a of the disc 40.

As shown in FIG. 4, the motor 50 has a hub 55 that rotates about a rotation shaft 50 a. The hub 55 has a cylindrical shape whose axial center coincides with the rotation shaft 50a.
The disc 40 is made of a metal disc having excellent heat dissipation, such as aluminum or copper. The disc 40 has a first opening 43. As shown in FIG. 2A, the first opening 43 is formed at the center of the disc 40, has substantially the same diameter as the hub 55, and has a configuration in which the hub 55 can be fitted. .

The phosphor layer 42 is composed of, for example, a layer containing (Y, Gd) ₃ (Al, Ga) ₅ O ₁₂ : Ce, which is a YAG phosphor.
The reflective film 41 is provided between the phosphor layer 42 and the disc 40 and is designed to reflect the fluorescence Y (see FIG. 1) excited by the phosphor layer 42 with high efficiency.
The reflective film 41 and the phosphor layer 42 have a ring shape.

  The heat sink 51 is made of a metal material having excellent heat dissipation, such as aluminum, copper, silver, or iron. As shown in FIG. 2B, the heat sink 51 includes a plurality of fins 52 and a flat plate 53.

  The plurality of fins 52 are formed integrally with the flat plate 53. The plurality of fins 52 are arranged to surround the hub 55. The plurality of fins 52 are constituted by projecting members that are curved so as to form a spiral shape from the radially outer side to the inner side of the disc 40 in a plan view shown in FIG. According to this configuration, when the disk 40 is rotated, an air flow can be formed from the radially inner side to the outer side.

  The flat plate 53 has a disk shape and has a second opening 54 as shown in FIG. The second opening 54 is formed at the center of the flat plate 53, has the same diameter as the first opening 43, and can be fitted with the hub 55.

  The heat sink 51 is fixed to the second surface 40 b of the disc 40 with an adhesive 56. The adhesive 56 is applied to a region facing the flat plate 53 of the heat sink 51. Further, the heat sink 51 is also fixed to the motor 50 via an adhesive 57 as shown in FIG. The adhesive 57 is applied to a region facing the periphery of the hub 55 of the motor 50. As the adhesives 56 and 57, a silicon adhesive or the like having high thermal conductivity can be used.

  As shown in FIG. 3, the rotating fluorescent plate 30 having the above-described configuration is configured such that the heat sink 51 is fitted to the hub 55 of the motor 50 through the second opening 54 and the disk through the first opening 43. It is assembled by fitting 40. Since the first opening 43 and the second opening 54 have the same diameter, the disc 40 and the heat sink 51 can be assembled to the hub 55 with substantially the same pressure.

  When the disc 40 and the heat sink 51 are assembled to the hub 55, at least a part (all in the present embodiment) of the first inner wall surface 43a forming the first opening 43 is in contact with the peripheral surface 55a of the hub 55. Surface contact with width. Further, at least a part (all in the present embodiment) of the second inner wall surface 54a forming the second opening 54 is in surface contact with the peripheral surface 55a of the hub 55 with a predetermined width.

  As shown in FIG. 4, the first inner wall surface 43a is in surface contact with the peripheral surface 55a of the hub 55 with a first width W1 in the axial direction of the rotary shaft 50a. Further, the second inner wall surface 54a is in surface contact with the peripheral surface 55a of the hub 55 with the second width W2 in the axial direction of the rotation shaft 50a. The second width W2 is larger than the first width W1. In the present embodiment, the second width W2 is 1.5 times larger than the first width W1.

  The flat plate 53 includes a thin portion 53a in which the plurality of fins 52 are provided, and a thick portion 53b in which the second opening 54 is provided. The thick part 53b has a thickness three times or more that of the thin part 53a. As shown in FIG. 3, the thick portion 53b has a protruding ring shape. The thick portion 53 b is provided on the radially inner side than the plurality of fins 52. The thick portion 53b also has a function as a spacer that defines the assembly position of the motor 50 and the disc 40 in the axial direction.

  According to the rotating fluorescent plate 30 having the above-described configuration, since the disc 40 and the heat sink 51 are separate bodies, it is not necessary to manufacture them using die casting or the like. That is, secondary processing (polishing or the like) for obtaining the required flatness and flatness is not required for the disc 40 to which the heat sink 51 is fixed. Thus, since the required planar roughness and flatness can be obtained without subjecting the disc 40 to secondary processing, the reflective film 41 and the phosphor layer 42 can be formed satisfactorily. Therefore, the manufacturing cost can be suppressed and the cost can be reduced.

  The disc 40 has a first opening 43 that fits into the hub 55 of the motor 50, and a first inner wall surface 43 a that forms the first opening 43 is a peripheral surface 55 a of the hub 55. Surface contact with the entire circumference of the plate with a predetermined width. Furthermore, the heat sink 51 has a second opening 54 that fits into the hub 55 of the motor 50, and a second inner wall surface 54 a that forms the second opening 54 is formed on the peripheral surface 55 a of the hub 55. Surface contact with the entire circumference with a predetermined width. As described above, the first inner wall surface 43a and the second inner wall surface 54a are in surface contact with the peripheral surface 55a of the hub 55, so that each of the disc 40 and the heat sink 51 is not inclined and is accurately applied to the hub 55. Assembled. Therefore, occurrence of surface blurring and eccentricity can be suppressed, and light can be efficiently extracted from the phosphor layer 42.

  In the present embodiment, as shown in FIG. 4, the first inner wall surface 43a is in surface contact with the peripheral surface 55a of the hub 55 with the first width W1 in the axial direction of the rotating shaft 50a, and the second The inner wall surface 54a is in surface contact with the peripheral surface 55a of the hub 55 with a second width W2 that is larger than the first width W1 in the axial direction of the rotary shaft 50a. According to this configuration, in the axial direction of the rotation shaft 50a, the second width W2 of the second inner wall surface 54a that is in surface contact with the peripheral surface 55a of the hub 55 is equal to the first width W1 of the first inner wall surface 43a. Therefore, the heat sink 51 having a larger volume and weight than the disk 40 and having a large influence on occurrence of surface blurring and eccentricity can be attached to the hub 55 with high accuracy.

  The heat sink 51 includes a flat plate 53 and a plurality of fins 52. The flat plate 53 has a thin portion 53a in which the plurality of fins 52 are provided and a thick portion 53b in which the second opening 54 is provided. . According to this configuration, since the second opening 54 is provided in the thick portion 53b, it is possible to ensure a large second width W2 in which the second inner wall surface 54a comes into surface contact with the peripheral surface 55a of the hub 55. The heat sink 51 can be attached to the hub 55 with high accuracy. In addition, since the plurality of fins 52 are provided in the thin portion 53a, the heat path from the phosphor layer 42 to the plurality of fins 52 can be shortened, and the cooling efficiency can be increased. Further, since the thick portion 53b is provided, the rigidity around the second opening 54 can be improved, and the deformation of the heat sink 51 is suppressed against the stress generated when the heat sink 51 is assembled to the hub 55. Can do.

  That is, since the blue light E made of laser light is incident on the phosphor layer 42, heat is generated in the phosphor layer 42. The motor 50 sequentially changes the incident position of the blue light E in the phosphor layer 42 by rotating the disk 40. Thereby, it is possible to prevent the occurrence of a problem that the same portion of the phosphor layer 42 is deteriorated by being intensively irradiated with the blue light B. The heat generated in the phosphor layer 42 is transferred to the heat sink 51 through the thin portion 53 a of the flat plate 53 and is efficiently radiated from the heat sink 51.

  As described above, according to the present embodiment, the motor 50, the disk 40 rotated by the motor 50, the phosphor layer 42 provided on the disk 40, and the disk 40 are provided separately. The motor 50 has a hub 55 that rotates about a rotating shaft 50a, the disk 40 has a first opening 43 that fits into the hub 55, and the heat sink 51 The second opening 54 that fits into the hub 55, and at least a part of the first inner wall surface 43a that forms the first opening 43 is in surface contact with the peripheral surface 55a of the hub 55; By adopting the rotating fluorescent plate 30 in which at least a part of the second inner wall surface 54a forming the second opening 54 is in surface contact with the peripheral surface 55a of the hub 55, cost reduction and occurrence of surface blurring and eccentricity are caused. Can be suppressed. Moreover, the 1st illuminating device 100 provided with the rotation fluorescent plate 30 has high reliability, and can produce | generate bright illumination light (white light W) at low cost. In addition, the projector 1 including the first lighting device 100 can display an image with excellent quality at a low cost.

  In addition, this invention is not necessarily limited to the thing of the said embodiment, A various change can be added in the range which does not deviate from the meaning of this invention.

FIG. 5 is a configuration diagram of a heat sink 51 according to another embodiment. FIG. 6 is a configuration diagram of a disc 40 according to another embodiment.
The heat sink 51 shown in FIG. 5 is the above-described embodiment in that the second inner wall surface 54a has a plurality of notches 54a1 extending along the axial direction of the rotating shaft 50a at intervals in the circumferential direction of the rotating shaft 50a. Different from form. 6 is that the first inner wall surface 43a has a plurality of cutout portions 43a1 extending along the axial direction of the rotating shaft 50a at intervals in the circumferential direction of the rotating shaft 50a. , Different from the above embodiment.

  According to this configuration, the first inner wall surface 43a and the second inner wall surface 54a have a plurality of cutout portions 43a1 and 54a1 extending in the axial direction of the rotating shaft 50a at intervals in the circumferential direction of the rotating shaft 50a. Therefore, the disk 40 and the heat sink 51 can be assembled to the hub 55 with a light pressure, and deformation of components that occurs during the assembly can be suppressed. In addition, although the shape of the notch part 43a1 shown in FIG. 5 and the notch part 54a1 shown in FIG. 6 has a mutually different shape, it is good also as the same shape, for example.

FIG. 7 is a cross-sectional view of the rotating fluorescent plate 30 according to another embodiment.
The rotating fluorescent plate 30 shown in FIG. 7 is different from the above embodiment in that it includes a disc 40A formed of a transparent member.
The disc 40A is formed of, for example, a glass substrate, and the phosphor layer 42 is provided on the second surface 40b. That is, the first surface 40a is an incident surface on which the blue light E is incident, and the second surface 40b is an emission surface on which the fluorescence Y is emitted. The heat sink 51 provided on the second surface 40b has a size that does not interfere with the fluorescence Y. Even in this configuration, by bringing the disc 40 </ b> A and the heat sink 51 into surface contact with the hub 55 of the motor 50, the same operational effects as in the above embodiment can be obtained.

  Moreover, in the said embodiment, although 2nd width W2 was larger than 1st width W1, it is not restricted to this structure. For example, if the strength (rigidity) of the heat sink 51 or the disc 40 can be sufficiently secured, the second width W2 may be set to be equal to or smaller than the first width W1.

  In the above-described embodiment, the projector 1 including the three liquid crystal light modulation devices 400R, 400G, and 400B is illustrated. However, the projector 1 can be applied to a projector that displays a color image with one liquid crystal light modulation device. Further, a digital mirror device (DMD) may be used as the light modulation device.

  DESCRIPTION OF SYMBOLS 1 ... Projector, 10 ... 1st light source (light source), 30 ... Rotary fluorescent plate (wavelength converter), 40 ... Disc (base material), 40A ... Disc (base material), 41 ... Reflective film (reflective member), 42 ... phosphor layer (wavelength conversion element), 43 ... first opening, 43a ... first inner wall surface, 43a1 ... notch, 50 ... motor (rotating device), 50a ... rotating shaft, 51 ... heat sink, 52 ... Fin, 53 ... Flat plate, 53a ... Thin portion, 53b ... Thick portion, 54 ... Second opening, 54a ... Second inner wall surface, 54a1 ... Notch, 55 ... Hub, 55a ... Circumferential surface, DESCRIPTION OF SYMBOLS 100 ... 1st illuminating device (illuminating device), 400R, 400G, 400B ... Liquid crystal light modulation device (light modulation device), 600 ... Projection optical system, W1 ... 1st width | variety, W2 ... 2nd width | variety.

Claims (9)

A rotating device;
A base material rotated by the rotating device;
A wavelength conversion element provided on the substrate;
A heat sink provided separately from the base material,
The rotating device has a hub that rotates around a rotation axis;
The base has a first opening that fits into the hub;
The heat sink has a second opening that fits into the hub;
At least part of the first inner wall surface forming the first opening is in surface contact with the peripheral surface of the hub, and at least part of the second inner wall surface forming the second opening is A wavelength conversion device in surface contact with the peripheral surface of the hub. The wavelength conversion device according to claim 1, wherein the first opening and the second opening have the same diameter. The said 1st inner wall surface and the said 2nd inner wall surface have several notch parts extended along the axial direction of the said rotating shaft at intervals in the circumferential direction of the said rotating shaft. Wavelength converter. The first inner wall surface is in surface contact with the peripheral surface of the hub with a first width in the axial direction of the rotating shaft,
4. The surface contact of the second inner wall surface with the peripheral surface of the hub with a second width larger than the first width in the axial direction of the rotation shaft. Wavelength converter. The heat sink includes a flat plate and a plurality of fins,
The wavelength conversion device according to any one of claims 1 to 4, wherein the flat plate includes a thin portion where the plurality of fins are provided and a thick portion where the second opening is provided. The wavelength converter as described in any one of Claims 1-5 which has a reflection member provided between the said wavelength conversion element and the said base material. The wavelength conversion device according to claim 1, wherein the base material is formed of a translucent member. A light source that emits light in a first wavelength band;
A wavelength converter according to any one of claims 1 to 7, which receives the light in the first wavelength band and emits light in a second wavelength band. A lighting device according to claim 8;
A light modulation device that forms image light by modulating illumination light from the illumination device according to image information; and
A projection optical system that projects the image light.

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