JP2017072674A - Wavelength converter, illumination apparatus and projector - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a wavelength converter capable of preventing degradation of optical exchange efficiency of a fluorescent body and generation of noises, and an illumination apparatus and a projector.SOLUTION: The wavelength converter includes: a rotation device; a base member that is rotated by the rotation device; a wavelength conversion element disposed on the base member; a heat sink which is formed different from the base member. The rotation device has a hub that rotates on the rotation axis, the base member has an opening which is engaged with the hub. The heat sink is arranged to be movable and rotatable in an axial direction of the rotation axis with respect to the hub. The wavelength converter has a heat sink drive unit that drives the heat sink to move between a contact position where the heat sink is brought into contact with the base member and a separation position where the heat sink is separated from the base member.SELECTED DRAWING: Figure 4

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

  In the above prior art, in order to prevent a decrease in the light exchange efficiency of the phosphor, a cooling fin serving as a heat dissipation region is provided on the back surface of the base material supported by the phosphor to lower the temperature of the phosphor. However, there is a problem that noise occurs when the cooling fins coupled to the base material rotate.

  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 suppress a decrease in light exchange efficiency of a phosphor and generation of noise. .

  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 rotating shaft, the base member has an opening that fits into the hub, and the heat sink is disposed on the rotating shaft with respect to the hub. A wavelength converter having a heat sink moving device that is provided so as to be movable and rotatable in an axial direction and moves the heat sink between a contact position for contacting the base material and a spaced position for separating the heat sink from the base material. Is provided.

  According to the wavelength conversion device according to the first aspect, the heat sink moved separately from the substrate by the heat sink moving device moves in the axial direction of the rotation shaft with respect to the hub, and comes into contact with and separates from the substrate. Is possible. When the heat sink comes into contact with the base material, the heat received by the wavelength conversion element is transferred to the heat sink through the base material, and the temperature of the wavelength conversion element can be lowered to prevent a decrease in light exchange efficiency. Further, when the heat sink is separated from the base material, the heat sink is provided so as to be rotatable with respect to the hub, so that the heat sink does not rotate with the base material, and the generation of noise can be suppressed. For this reason, when heat dissipation of the wavelength conversion element is required, a heat sink is brought into contact with the base material, and when heat dissipation of the wavelength conversion element is not required, the heat sink is separated from the base material to suppress generation of noise. it can.

In the first aspect, the heat sink moving device adopts a configuration in which the heat sink is moved from the separated position to the contact position when the rotating device reaches a predetermined number of rotations or more.
According to this configuration, since the rotation speed of the rotation device increases according to the temperature of the wavelength conversion element, when the rotation device becomes a predetermined rotation speed or more, the heat sink is moved from the separated position to the contact position, The temperature of the wavelength conversion element can be lowered to prevent a decrease in light exchange efficiency.

In the first aspect, a configuration is adopted in which a control device for electrically controlling the heat sink moving device is provided based on the number of rotations of the rotating device.
According to this configuration, the heat dissipation of the wavelength conversion element and the suppression of noise generation can be switched at an appropriate timing by moving the heat sink by electrical control based on the rotation speed of the rotating device.

Moreover, the said 1st aspect WHEREIN: The structure of having a 2nd control apparatus which electrically controls the rotation speed of the said rotation apparatus is employ | adopted.
According to this configuration, the heat sink moving device can be indirectly controlled by controlling the rotation speed of the rotating device.

In the first aspect, a configuration is adopted in which a third control device that electrically controls the heat sink moving device is provided based on the brightness of light emitted from the wavelength conversion element.
According to this configuration, when the light emitted from the wavelength conversion element is bright, the temperature of the wavelength conversion element rises. When the light emitted from the wavelength conversion element is dark, the temperature of the wavelength conversion element does not rise so much. By moving the heat sink by electrical control based on the brightness of light emitted from the wavelength conversion element, it is possible to switch between heat dissipation of the wavelength conversion element and suppression of noise generation at an appropriate timing.

  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 suppress a decrease in light exchange efficiency of the phosphor and generation of noise, and to 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 suppress a decrease in light exchange efficiency of the phosphor and generation of noise, and to perform a bright and excellent display quality display.

It is a top view which shows the optical system of the projector which concerns on this embodiment. It is a block diagram by the side of the 1st surface of the disc of the rotation fluorescent plate concerning this embodiment. It is a block diagram by the side of the 2nd surface of the disc of the rotation fluorescent plate which concerns on this embodiment. It is sectional drawing of a rotation fluorescent screen when the heat sink concerning this embodiment is located in a separation position. It is sectional drawing of a rotation fluorescent screen when the heat sink concerning this embodiment is located in a contact position. It is a graph which shows the noise which a rotation fluorescent screen generate | occur | produces. 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 configuration diagram on the first surface 40a side of the disc 40 of the rotating fluorescent plate 30 according to the present embodiment. FIG. 3 is a configuration diagram on the second surface 40b side of the disc 40 of the rotating fluorescent plate 30 according to the present embodiment. FIG. 4 is a cross-sectional view of the rotating fluorescent plate 30 when the heat sink 51 according to the present embodiment is located at the separated position. FIG. 5 is a cross-sectional view of the rotating fluorescent plate 30 when the heat sink 51 according to the present embodiment is located at the contact position.

  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. 2, the phosphor layer 42 is provided along the circumferential direction of the first surface 40 a of the disc 40. As shown in FIG. 3, the heat sink 51 is provided on a 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 55a that rotates about a rotation shaft 50a. The hub 55a has a cylindrical shape whose axis coincides with the rotation shaft 50a. The hub 55a constitutes the rotor 55 and rotates with respect to the main body 56 (stator). The rotor 55 has a rotor magnet 55b and is supported by the main body 56 via a shaft 55c. The main body 56 includes a bearing sleeve 56a that rotatably supports the shaft 55c, a coil 56b that faces the rotor magnet 55b, and a stator core 56c around which the coil 56b is wound.

  The disc 40 is made of a metal disc having excellent heat dissipation, such as aluminum or copper. The disc 40 has an opening 43. As shown in FIG. 2, the opening 43 is formed at the center of the disc 40, has substantially the same diameter as the hub 55 a, and has a configuration in which the hub 55 a 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 is made of, for example, silver or the like, and is made of a film having a reflectivity higher than that of the disk 40 at least.
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 illustrated in FIG. 3, 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 flat plate 53 has an annular shape.

  As shown in FIG. 4, the flat plate 53 is provided with an adhesion layer 53 a that is in close contact with the disk 40 on the surface facing the disk 40. The adhesion layer 53 a is a heat transfer sheet having a friction coefficient larger than that of the flat plate 53, and is configured to rotate the heat sink 51 integrally with the disc 40 when the heat sink 51 contacts the disc 40.

  The plurality of fins 52 are arranged so as to surround the hub 55a in a plan view shown in FIG. The plurality of fins 52 are formed of 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. According to this configuration, when the disk 40 rotates, an air flow can be formed from the rotation center side of the motor 50 to the outside.

  As shown in FIG. 4, the heat sink 51 is provided so as to be movable and rotatable in the axial direction of the rotary shaft 50a with respect to the hub 55a. The heat sink 51 of the present embodiment is supported by the hub 55a via the first ball 60 and the second ball 61. The first ball 60 supports the heat sink 51 movably in the axial direction of the rotary shaft 50a with respect to the hub 55a. The second ball 61 supports the heat sink 51 so as to be rotatable in the circumferential direction with respect to the hub 55a.

  The first ball 60 is rotatably supported by a recessed groove 62a formed on the inner peripheral surface of the moving plate 62, and engages with a spline groove (not shown) formed in the axial direction on the peripheral surface of the hub 55a. Yes. The moving plate 62 has an annular shape, is movable in the axial direction of the rotary shaft 50a with respect to the hub 55a, and can rotate integrally with the hub 55a.

  A plurality of second balls 61 are freely rollable in the circumferential direction between an annular groove 62 b formed on the outer peripheral surface of the moving plate 62 and an annular groove 63 a formed on the inner peripheral surface of the heat sink support plate 63. Has been placed. The heat sink support plate 63 has an annular shape, is rotatable in the circumferential direction with respect to the moving plate 62, and can move integrally with the heat sink 51.

  The rotating fluorescent plate 30 moves the heat sink 51 between a contact position where the heat sink 51 is brought into contact with the disk 40 as shown in FIG. 5 and a separated position where the heat sink 51 is separated from the disk 40 as shown in FIG. A moving device 64 is provided. The heat sink moving device 64 is configured to move the heat sink 51 from the separated position (see FIG. 4) to the contact position (see FIG. 5) when the motor 50 reaches a predetermined number of revolutions or more.

The heat sink moving device 64 biases the heat sink 51 from the abutting position toward the separated position, and a pressing force that presses the heat sink 51 toward the disk 40 against the bias of the biasing member 65. And a device 66.
The urging member 65 is interposed between the moving plate 62 and the disc 40. The pressing device 66 is provided on the rotor 55.

The biasing member 65 is a coil spring, for example, and is disposed around the hub 55a. One end of the urging member 65 abuts on the second surface 40b of the disc 40, and the other end of the urging member 65 abuts on the first surface 62c of the moving plate 62 facing the second surface 40b. ing. Further, the portions where the one end and the other end of the urging member 65 are in contact with the second surface 40b of the disc 40 and the first surface 62c of the moving plate 62 are in contact with any one of points, lines, and surfaces. It may be configured. Further, the disc 40 and the moving plate 62 are rotatably provided with respect to the biasing member 65.
The pressing device 66 includes a third ball 67 and a pressing member 68. The third ball 67 is accommodated in the inner space 55d of the rotor 55 so as to be movable in the radial direction. A plurality of internal spaces 55d are provided around the rotation shaft 50a.

  The pressing member 68 includes an inclined portion 68a accommodated in the internal space 55d, and a pressing portion 68b that protrudes from the internal space 55d and presses the moving plate 62. The inclined portion 68a converts the force that the third ball 67 moves radially outward by centrifugal force into the force that the pressing portion 68b presses the moving plate 62. The pressing portion 68b is provided integrally with the inclined portion 68a, is guided in the axial direction by the communication port 55e communicating with the internal space 55d, and is a second surface opposite to the first surface 62c of the moving plate 62. It is in contact with 62d.

  In the rotating fluorescent plate 30 configured as described above, 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.

  When the rotation speed of the motor 50 is small (for example, in the silent mode (eco mode)), the biasing force of the biasing member 65 is larger than the pressing force of the pressing device 66 as shown in FIG. Are spaced apart from each other. The heat sink 51 is provided so as to be rotatable with respect to the hub 55a by the second ball 61. When the heat sink 51 is separated from the disk 40, the rotation speed of the heat sink 51 gradually decreases, and finally the rotation stops. To do. In other words, it does not rotate with the disc 40. Thereby, generation | occurrence | production of noise can be suppressed.

FIG. 6 is a graph showing noise generated by the rotating fluorescent plate 30. In FIG. 6, “substrate only” indicates the magnitude of noise when only the disk 40 is rotated at a certain rotational speed without providing the heat sink 51, and “with fins” indicates the heat sink The magnitude of noise when 51 is coupled to the disc 40 and rotated at the same rotational speed is shown.
As shown in FIG. 6, it is clear that “with fins” is louder than “only the substrate”. For this reason, as shown in FIG. 4, when the heat sink 51 is separated from the disk 40, the rotation of the heat sink 51 is stopped, and the state is substantially the same as “only the substrate” in FIG. Can be suppressed.

  On the other hand, when the motor 50 reaches a predetermined rotational speed or higher (for example, 4000 rpm or higher), the heat sink moving device 64 moves the heat sink 51 from the separated position to the contact position as shown in FIG. That is, when the rotation speed of the motor 50 increases, the centrifugal force applied to the third ball 67 increases, and the third ball 67 moves outward in the radial direction. When the third ball 67 moves outward in the radial direction, the inclined portion 68a of the pressing member 68 applies a force for moving the third ball 67 outward in the radial direction by centrifugal force, and the pressing portion 68b presses the moving plate 62. Convert to force.

  The heat sink 51 is provided so as to be movable in the axial direction with respect to the hub 55 a by the first ball 60, and the urging member 65 urges the moving plate 62 when the pressing portion 68 b presses the moving plate 62. If it becomes larger than the force to do, the heat sink 51 will move to an axial direction. When the heat sink 51 moves in the axial direction and comes into contact with the disk 40, the heat sink 51 comes into close contact with the disk 40 through the adhesion layer 53a. When the heat sink 51 is in close contact with the disk 40, the heat sink 51 rotates with the disk 40.

  As described above, according to the present embodiment, the heat sink 51 provided separately from the disk 40 is moved by the heat sink moving device 64 in the axial direction of the rotary shaft 50a with respect to the hub 55a. Contact and separation are possible. When the heat sink 51 comes into contact with the disc 40, the heat received by the phosphor layer 42 is transferred to the heat sink 51 via the disc 40, thereby lowering the temperature of the phosphor layer 42 and preventing the light exchange efficiency from being lowered. Can do.

  Further, when the heat sink 51 is separated from the disk 40, the heat sink 51 is provided so as to be rotatable with respect to the hub 55a. Therefore, the heat sink 51 does not rotate with the disk 40, and noise generation can be suppressed. For this reason, when the heat radiation of the phosphor layer 42 is required, a heat sink is brought into contact with the disk 40, and when the heat radiation of the phosphor layer 42 is not necessary, the heat sink is separated from the disk 40 to generate noise. Can be suppressed.

  In the present embodiment, the heat sink moving device 64 moves the heat sink 51 from the separated position to the contact position when the motor 50 reaches a predetermined number of revolutions or more. According to this configuration, since the rotation speed of the motor 50 is increased according to the temperature of the phosphor layer 42, the heat sink 51 is moved from the separated position to the contact position when the motor 50 exceeds a predetermined rotation speed. Thus, the temperature of the phosphor layer 42 can be automatically lowered to prevent a decrease in light exchange efficiency.

  As described above, according to the present embodiment, the rotating fluorescent plate 30 includes the motor 50, the disc 40 rotated by the motor 50, the phosphor layer 42 provided on the disc 40, and the disc 40. And a heat sink 51 provided separately. The motor 50 has a hub 55a that rotates about a rotation shaft 50a, the disk 40 has an opening 43 that fits into the hub 55a, and the heat sink 51 is an axis of the rotation shaft 50a with respect to the hub 55a. It is provided so as to be movable and rotatable in the direction. In addition, the rotating fluorescent plate 30 includes a heat sink moving device 64 that moves the heat sink 51 between a contact position where the heat sink 51 is brought into contact with the disk 40 and a separated position where the heat sink 51 is separated from the disk 40. Reduction in light exchange efficiency and generation of noise can be suppressed. Further, the first lighting device 100 including the rotating fluorescent plate 30 can generate bright illumination light (white light W). In addition, the projector 1 including the first lighting device 100 can display an image with excellent quality.

  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. 7 is a cross-sectional view of a rotating fluorescent plate 30A according to another embodiment. In the following description, the same or equivalent components as those in the above-described embodiment are denoted by the same reference numerals, and the description thereof is simplified or omitted.
The rotating fluorescent plate 30A shown in FIG. 7 is different from the above embodiment in that it includes a control device 800 that electrically controls the heat sink moving device 64.

  The control device 800 is an information processing device including a calculation unit, a storage unit, a communication unit, a display unit, and the like. The control device 800 is configured to electrically control the heat sink moving device 64 based on the rotational speed of the motor 50. The pressing device 66 shown in FIG. 7 includes an electric actuator 69 and moves the heat sink 51 in the axial direction under the control of the control device 800.

  According to this configuration, the heat sink 51 can be moved by electrical control based on the number of revolutions of the motor 50, and heat dissipation of the phosphor layer 42 and suppression of noise generation can be switched at appropriate timing. For example, when the rotational speed of the motor 50 is 4000 rpm or more, the heat sink 51 can be moved to the contact position, and when it is less than 4000 rpm, the heat sink 51 can be moved to the separated position.

  7 is configured to control the three-phase current supplied to the coil 56b and to electrically control the rotational speed of the motor 50 (second control device). According to this configuration, the heat sink moving device 64 can be indirectly controlled by controlling the rotation speed of the motor 50. For example, when the calorific value of the phosphor layer 42 is large, the rotational speed of the motor 50 is increased to 4000 rpm, the heat sink 51 is moved to the contact position, the temperature of the phosphor layer 42 is lowered, and the light exchange efficiency is prevented from being lowered. be able to. This configuration can be suitably applied to the embodiments described above.

  Further, the control device 800 shown in FIG. 7 is configured to electrically control the heat sink moving device 64 based on the brightness of the fluorescent light Y (light) emitted from the phosphor layer 42 (the third device). Control device). The control device 800 is configured to detect the brightness of the fluorescence Y emitted from the phosphor layer 42 via the illuminance sensor 801. Note that the control device 800 determines the brightness of the fluorescence Y emitted from the phosphor layer 42 based on a control command value from a host control system (not shown) that controls the brightness of the first light source 10 shown in FIG. The structure which acquires may be sufficient.

  When the fluorescence Y emitted from the phosphor layer 42 is bright, the temperature of the phosphor layer 42 increases. When the fluorescence Y emitted from the phosphor layer 42 is dark, the temperature of the phosphor layer 42 does not increase so much. For this reason, the heat control of the phosphor layer 42 and the suppression of noise generation are switched at an appropriate timing by moving the heat sink 51 by electrical control based on the brightness of the fluorescence Y emitted from the phosphor layer 42. be able to. For example, when the fluorescence Y emitted from the phosphor layer 42 is dark and the phosphor layer 42 is sufficiently cooled only by the rotation of the disk 40, even if the rotation speed of the motor 50 is 4000 rpm or more, Control such that the heat sink 51 is not moved to the contact position is possible.

  In addition, the control apparatus 800 may divide | segment a structure for every function. For example, a control device that electrically controls the heat sink moving device 64 based on the number of rotations of the motor 50, a second control device that electrically controls the number of rotations of the motor 50, and the phosphor layer 42 are emitted. Based on the brightness of the fluorescent light Y (light), the third control device that electrically controls the heat sink moving device 64 may be separated in hardware. Further, they can be applied in combination as appropriate.

  In the above embodiment, the heat sink moving device 64 has been described with respect to the configuration in which the heat sink 51 is moved from the separated position to the contact position when the motor 50 reaches a predetermined number of revolutions or more. The configuration in which the heat sink 51 is moved from the contact position to the separated position when the motor 50 reaches a predetermined number of revolutions or more by reversing the inclination of the inclined portion 68a shown in the drawing may be adopted. That is, when the fluorescence Y emitted from the phosphor layer 42 is dark, increasing the rotational speed of the disk 40 may have a higher cooling effect than contacting the heat sink 51.

  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, 30A ... Rotary fluorescent plate (wavelength converter), 40 ... Disc (base material), 40a ... 1st surface, 40b ... 2nd surface, 41 ... Reflective film, 42 ... phosphor layer (wavelength conversion element), 43 ... opening, 50 ... motor (rotating device), 50a ... rotating shaft, 51 ... heat sink, 52 ... fin, 53 ... flat plate, 53a ... adhesion layer, 55 ... rotor, 55a ... hub, 55b ... rotor magnet, 55c ... shaft, 55d ... internal space, 55e ... communication port, 56 ... main body, 56a ... bearing sleeve, 56b ... coil, 56c ... stator core, 60 ... first ball, 61 ... second ball, 62 ... moving plate, 62a ... recessed groove, 62b ... annular groove, 62c ... first surface, 62d ... second surface, 63 ... heat sink support plate, 63a ... annular groove, 64 ... heat Moving device, 65 ... biasing member, 66 ... pressing device, 67 ... third ball, 68 ... pressing member, 68a ... inclined portion, 68b ... pressing portion, 69 ... electric actuator, 100 ... first lighting device (illumination) Device), 400B, 400G, 400R,... Liquid crystal light modulation device (light modulation device), 600 ... projection optical system, 800 ... control device (control device, second control device, third control device), 801 ... illuminance Sensor, E ... blue light (light in the first wavelength band), Y ... fluorescence (light in the second wavelength band).

Claims (7)

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 an opening that fits into the hub;
The heat sink is provided so as to be movable and rotatable in the axial direction of the rotating shaft with respect to the hub,
A wavelength conversion device, comprising: a heat sink moving device that moves the heat sink between a contact position for contacting the base material and a separation position for separating the heat sink from the base material. The wavelength conversion device according to claim 1, wherein the heat sink moving device moves the heat sink from the separated position to the contact position when the rotating device reaches a predetermined number of rotations or more. The wavelength conversion device according to claim 1, further comprising a control device that electrically controls the heat sink moving device based on a rotation speed of the rotation device. The wavelength conversion device according to claim 2, further comprising a second control device that electrically controls a rotation speed of the rotation device. 5. The wavelength conversion device according to claim 1, further comprising: a third control device that electrically controls the heat sink moving device based on brightness of light emitted from the wavelength conversion element. A light source that emits light in a first wavelength band;
A wavelength converter according to any one of claims 1 to 5, which receives the light in the first wavelength band and emits light in a second wavelength band. A lighting device according to claim 6;
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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