JP6662534B2 - Cooling structure of illumination optical system and projection display device - Google Patents

Description

  The present invention relates to a cooling structure of an illumination optical system using a phosphor and a projection display device.

  In recent years, an illumination optical system including a phosphor that emits fluorescence by irradiation with excitation light has been proposed. This type of illumination optical system is used, for example, in a projection display device. FIG. 1 is a perspective view of a projection display apparatus including an illumination optical system according to the present invention. FIG. 2 is a perspective view of an illumination optical system related to the present invention. FIG. 3 shows a plan view of an illumination optical system related to the present invention.

  As shown in FIG. 1, a projection display apparatus 101 related to the present invention includes an illumination optical system 103 and an image generation optical system 104 to which light is incident from the illumination optical system 103. As shown in FIGS. 2 and 3, the illumination optical system 103 includes a laser light source 107 and a phosphor wheel 112 provided with a phosphor layer to be irradiated with laser light emitted from the laser light source 107. I have.

  As an illumination optical system including such a phosphor wheel, there is one disclosed in Patent Document 1. Patent Literature 1 discloses an illumination optical system including a phosphor unit having a phosphor wheel and a motor for rotating the phosphor wheel.

  The phosphor wheel disclosed in Patent Literature 1 has a substrate rotatably provided around a rotation axis orthogonal to one surface. On one surface of the substrate, a phosphor region and a reflection region are formed. The phosphor region has a phosphor layer that emits fluorescence of a predetermined wavelength when irradiated with laser light. The reflection area is an area that reflects the laser light. The laser light emitted from the phosphor wheel is repeatedly applied to the phosphor region and the reflection region of the rotating phosphor wheel. Thereby, the fluorescent light emitted from the phosphor and the laser light reflected by the reflection area are sequentially emitted from the phosphor wheel.

  The illuminance of light emitted from such an illumination optical system depends on the amount of fluorescent light generated from the phosphor. The phosphor has a characteristic that heat is generated by the irradiation of the laser beam, and the luminous efficiency is reduced by the generated heat. Therefore, in order to prevent the illuminance of the light emitted from the illumination optical system from decreasing, it is necessary to suppress the heat generation of the phosphor.

  Patent Document 2 discloses a configuration including a phosphor wheel in which a recess is formed in a phosphor layer, and a fan that blows cooling air toward the recess of the phosphor wheel. In the configuration disclosed in Patent Literature 2, turbulence is generated by blowing cooling air to the concave portion of the phosphor wheel, and the cooling efficiency of the phosphor is enhanced by using an effect of diffusing heat.

WO 2012/127554 pamphlet JP 2012-78707 A JP 2013-25249 A

  In the illumination optical system described in Patent Document 1 described above, the phosphor is cooled by the flow of air around the phosphor wheel, which is received by the phosphor wheel itself when the phosphor wheel rotates. Therefore, the illumination optical system described in Patent Literature 1 has a poor cooling effect of cooling the phosphor.

  In the configuration disclosed in Patent Literature 2, cooling air is locally blown toward a portion of the phosphor layer of the phosphor wheel that is irradiated with the laser light. In such a configuration described in Patent Document 2, the cooling effect of the phosphor is still insufficient, and it is desired to further increase the cooling efficiency.

  Patent Document 3 discloses a configuration in which a fan that sends cooling air to one surface of a phosphor wheel on which a phosphor layer is formed is disposed near the phosphor wheel. However, in an illumination optical system using a phosphor wheel, a condenser lens for condensing the fluorescence emitted from the phosphor layer is arranged adjacent to the phosphor layer. Therefore, the flow of the cooling air is hindered by being blown to the lens holder holding the condenser lens, and it has been difficult to sufficiently flow the cooling air to one surface of the phosphor wheel. As described above, in the configuration described in Patent Literature 3, the cooling air is sent to only one surface of the phosphor wheel, and the flow of the cooling air is hindered by the lens holder, so that the cooling efficiency of the phosphor is low. There is.

  In addition, in general, in an illumination optical system using a laser light source, as shown in FIGS. 2 and 3, laser light leaks out of the illumination optical system 103 from a portion other than the lens 111 from which the light is emitted from the illumination optical system 103. Not covered by the cover 110. Therefore, the illumination optical system 103 has a structure closed from the outside. For this reason, in the illumination optical system 103 using the laser light source 107, the ambient temperature inside the cover 110 tends to rise, and the air inside the cover 110 is likely to be heated to a high temperature by the heat generated by the laser light source 107. For this reason, the surrounding air received by the phosphor wheel 112 disposed inside the cover 110 itself is also in a high temperature state, and there is a problem that the phosphor cooling efficiency is low.

  Therefore, in the illumination optical system related to the present invention described above, since the cooling efficiency of the phosphor is low, the temperature of the phosphor is likely to increase, and the illuminance of the light emitted from the illumination optical system is reduced. As a result, there is a problem that the illuminance maintenance rate decreases with the continuous use time of the illumination optical system.

  Therefore, an object of the present invention is to provide a cooling structure of an illumination optical system and a projection display device that can enhance the cooling efficiency of a phosphor and prevent a decrease in illuminance of light emitted from the illumination optical system. .

In order to achieve the above-described object, a cooling structure of an illumination optical system according to the present invention includes a phosphor member having a phosphor layer which emits fluorescence by excitation light emitted from a light source, and an internal space in which the phosphor member is arranged. the partition and the external space, and a duct for guiding cooling air to the phosphor member, the duct provided downstream of the phosphor member, a cooling member for cooling the cooling air, it is arranged outside the duct heat dissipation Member, the cooling member has a heat receiving portion arranged inside the duct, and a cooling portion connected to the heat receiving portion and arranged outside the duct, outside the duct, a heat radiating member and A radiating fan for sending another cooling air to the cooling unit is provided.

  Further, the projection display apparatus according to the present invention is an image generation optical system including an illumination optical system including a cooling structure of the illumination optical system, and an image element for modulating light emitted from the illumination optical system in accordance with an image signal. And.

  ADVANTAGE OF THE INVENTION According to this invention, the cooling efficiency of a fluorescent substance can be improved and the fall of the illuminance of the light emitted from an illumination optical system can be prevented.

FIG. 1 is a perspective view showing a projection display device including an illumination optical system related to the present invention. FIG. 2 is a perspective view showing an illumination optical system related to the present invention. FIG. 2 is a plan view showing an illumination optical system related to the present invention. FIG. 2 is a perspective view showing the projection display apparatus of the first embodiment in a see-through manner. FIG. 2 is a perspective view illustrating an illumination optical system included in the projection display device of the first embodiment. It is a perspective view shown for explaining the cooling structure of the illumination optical system of a 1st embodiment. FIG. 3 is a plan view illustrating a cooling structure of the illumination optical system according to the first embodiment. It is a top view which expands and shows the cooling structure of the illumination optical system of 1st Embodiment. It is a perspective view which expands and shows the duct and lens holder which the cooling structure of the illumination optical system of 1st Embodiment has. It is a perspective view shown for explaining the cooling structure of the illumination optical system of a 2nd embodiment. It is a top view showing the cooling structure of the illumination optical system of a 2nd embodiment. It is a top view which expands and shows the cooling structure of the illumination optical system of 2nd Embodiment. It is a perspective view showing a duct and a lens holder which a cooling structure of an illumination optical system of a 2nd embodiment has.

  Hereinafter, specific embodiments of the present invention will be described with reference to the drawings.

(First embodiment)
FIG. 4 is a perspective view of the projection display apparatus according to the first embodiment as seen through. FIG. 5 is a perspective view of an illumination optical system included in the projection display device according to the first embodiment. FIG. 6 is a perspective view illustrating the cooling structure of the illumination optical system according to the first embodiment. FIG. 7 is a plan view of the cooling structure of the illumination optical system according to the first embodiment.

  As shown in FIGS. 4 and 5, in the projection display apparatus 1 of the first embodiment, an illumination optical system 3 using a phosphor and light from the illumination optical system 3 enter and project on a projection surface. An image generation optical system 4 for generating an image.

  As shown in FIGS. 6 and 7, the illumination optical system 3 includes a first laser light source 6 and a second laser light source 7 that emit laser light, and a first laser light source 7 emitted from the first laser light source 6. The optical device includes a first optical component group forming an optical path and a second optical component group forming a second optical path of laser light emitted from the second laser light source 7. The illumination optical system 3 includes a cover 10 that covers the entire first optical path and covers the entire second optical path including the optical path from the second laser light source 7 to the phosphor wheel 12.

  As shown in FIG. 6, each of the first and second laser light sources 6 and 7 has a plurality of laser diodes 8 for emitting blue laser light having a blue wavelength. Are arranged. The first and second laser light sources 6 and 7 are not limited to those emitting blue laser light. As the first and second laser light sources 6 and 7, those that emit light of another wavelength such as ultraviolet light may be used. The first and second optical component groups will be described later. The cover 10 is configured by combining a set of an upper cover 10a and a lower cover 10b.

  As shown in FIG. 6, the second optical path is used for condensing the fluorescent light emitted from the second laser light source 7 with the fluorescent material wheel 12 and the fluorescent light emitted from the fluorescent material wheel 12. And a plurality of condenser lenses 13a, 13b, 13c. The illumination optical system 3 has a cooling structure 11 for cooling the phosphor wheel 12.

  FIG. 8 is an enlarged plan view of the cooling structure 11 of the illumination optical system according to the first embodiment. FIG. 9 is an enlarged perspective view of the duct and the lens holder of the cooling structure 11 of the illumination optical system according to the first embodiment.

  As shown in FIGS. 7 and 8, the cooling structure 11 of the illumination optical system according to the first embodiment includes a phosphor layer 12 b that emits fluorescence by laser light as excitation light emitted from the second laser light source 7. A phosphor wheel 12 serving as a phosphor member, a fan 15 for sending cooling air to the phosphor wheel 12, and an internal space in which the phosphor wheel 12 is disposed and an external space. To the phosphor wheel 12.

  As shown in FIG. 8, the phosphor wheel 12 includes a substrate 12a on which a phosphor layer 12b is formed. The substrate 12a is attached to a rotation shaft 17a of the wheel motor 17, and is configured to be rotatable about a rotation shaft 17a parallel to a direction orthogonal to the main surface of the substrate 12a. The wheel motor 17 is mounted on a bottom plate of the lower cover 10b. The phosphor layer 12b is formed by applying a phosphor on a circular substrate 12a. The phosphor emits yellow fluorescence having a wavelength band ranging from a green wavelength to a red wavelength.

  The phosphor wheel 12 of the present embodiment is configured to emit only yellow light, but is not limited to this. As the phosphor wheel 12, the phosphor layer may be divided so as to emit fluorescence of different colors according to the irradiation position of the laser beam on the phosphor layer.

  By using the phosphor wheel 12, the irradiation position of the laser beam changes with the rotation of the phosphor wheel 12, so that it is possible to suppress the occurrence of uneven temperature of the phosphor in each part of the phosphor layer 12b. For this reason, a decrease in the conversion efficiency to fluorescence in a part of the phosphor layer 12b is suppressed, and it is possible to stably obtain fluorescence.

  The fan 15 is arranged inside the cover 10. A sirocco fan is used as the fan 15 and has an air outlet for sending cooling air.

  As shown in FIGS. 6 and 7, the duct 16 is disposed inside the cover 10 and sends the cooling air sent from the fan 15 in a direction orthogonal to the rotation axis 17 a of the wheel motor 17. Has a partition wall 19 extended to the end. The partition wall 19 is formed on the bottom plate of the lower cover 10b along the side plate of the lower cover 10b. The duct 16 includes a partition wall 19, a top plate of the upper cover 10a, a bottom plate and side plates of the lower cover 10b, and is provided inside the cover 10. As described above, the duct 16 has an internal space closed by the partition wall 19, the top plate of the upper cover 10a, and the bottom plate and the side plates of the lower cover 10b. Is configured.

  As shown in FIG. 9, one end of the duct 16 is provided with an opening 16 a connected to an air outlet of the fan 15. Further, as shown in FIG. 7, a heat exchanger 21 as a cooling member for cooling the cooling air is provided at the other end of the duct 16 on the downstream side with respect to the phosphor wheel 12. The cooling air after passing through the phosphor wheel 12 is cooled by the heat exchanger 21. At the other end of the duct 16, as shown in FIG. 7, the cross-sectional area of the flow path is expanded. By increasing the cross-sectional area of the flow path at the other end of the duct 16, the amount of cooling air blown to the heat exchanger 21 is increased.

  As shown in FIGS. 6 and 7, the heat exchanger 21 includes a heat receiving unit 21 a arranged inside the other end of the duct 16, a cooling unit 21 b arranged outside the duct 16, and a heat receiving unit 21 a. And a heat transfer section 21c that transmits heat to the cooling section 21b. The heat exchanger 21 cools the phosphor wheel 12 so as to take heat from the warmed wind and cool it. By arranging the heat exchanger 21 in the duct 16 in this manner, the cooling air cooled by the heat exchanger 21 can be circulated to the fan 15, and the fluorescent light using the cooling air sent from the fan 15 is used. The cooling efficiency of the body is increased. In addition, as the heat exchanger, a liquid-cooling type cooling mechanism that performs cooling by circulating a liquid may be used.

  As shown in FIG. 8, the phosphor wheel 12 and the wheel motor 17 are arranged inside the duct 16. Further, inside the duct 16, a plurality of condenser lenses 13 a, 13 b, 13 c and a lens holder 22 holding the plurality of condenser lenses 13 a, 13 b, 13 c are provided, and the phosphor layer 12 b of the phosphor wheel 12 is provided. It is provided adjacent to the formed surface.

  As shown in FIGS. 8 and 9, the lens holder 22 has a holding portion 22a that holds the outer peripheral portions of the condenser lenses 13a, 13b, and 13c, and a base portion 22b that supports the holding portion 22a. .

  The base 22b of the lens holder 22 is formed in a plate shape having an L-shaped cross section, and is fixed on the bottom plate of the lower cover 10b. The base 22b has a rising wall 22c. The holding portion 22a is provided on the rising wall 22c at a position away from the bottom plate of the lower cover 10b. Further, the rising wall 22 c is connected to the partition wall 19 of the duct 16 so as to be aligned, and is configured as a part of the partition wall 19.

  With the configuration of the lens holder 22 as described above, the first ventilation path 23a through which the cooling air flows is secured between the holding portion 22a and the bottom plate of the lower cover 10b, and the ventilation of the cooling air is provided. Sex is raised. This prevents the cooling air sent from the fan 15 from being hindered by the lens holder 22 and allows the cooling air to flow smoothly along the partition wall 19 of the duct 16.

  The holding portion 22a of the lens holder 22 holds the outer peripheral portion of each of the condenser lenses 13a, 13b, 13c. The holding section 22a has a plurality of second ventilation paths 23b through which the cooling air sent from the fan 15 passes between the condenser lenses 13a, 13b, and 13c. The holding portion 22a has the second ventilation path 23b, so that the phosphor layer 12b can be efficiently cooled without hindering the flow of the cooling air sent from the fan 15.

  As shown in FIGS. 7 and 8, a heat sink 24 is provided outside the duct 16 as a heat radiating member for radiating heat transmitted from the rotating shaft 17 a to the outside of the duct 16.

  A heat sink 24 is connected to a bearing 17b of the rotating shaft 17a of the wheel motor 17. As shown in FIG. 8, a heat conductive sheet 25 is interposed between the bearing 17 b and the heat sink 24, and heat is transmitted from the bearing 17 b to the heat sink 24 via the heat conductive sheet 25, Heat is released. As described above, the use of the heat sink 24 enhances the effect of cooling the phosphor of the phosphor wheel 12. As a modification, instead of the structure in which the heat conductive sheet 25 is in contact with the bearing 17b, the heat conductive sheet 25 may be in a structure directly in contact with the rotating shaft 17a.

  Further, as shown in FIGS. 6 and 7, another fan 27 that sends cooling air to the heat sink 24 and the cooling unit 21 b of the heat exchanger 21 is provided outside the cover 10 outside the duct 16. . Outside the duct 16, a heat sink 24 and a cooling unit 21c are arranged at opposing positions.

  As the fan 27, a propeller fan is used. As shown in FIG. 4, the projection display device 1 of the present embodiment includes a housing 9 in which the illumination optical system 3 is provided, and is provided at a position inside the housing 9 facing the cooling unit 21b. , A fan 27 are arranged.

  The cooling air sent from the fan 27 cools the cooling unit 21b and then passes through the cooling unit 21b and is blown to the heat sink 24. Thereby, the cooling unit 21b and the heat sink 24 can be efficiently cooled by using the cooling air sent from one fan 27, and the cooling structure 11 is simplified.

  In the present embodiment, the cooling air that has passed through the cooling unit 21b of the heat exchanger 21 is configured to be blown to the heat sink 24, but the invention is not limited to this configuration. As a modification, it is a matter of course that the cooling air that has passed through the heat sink 24 may be blown to the cooling unit 21b, or the cooling air may flow between the heat sink 24 and the cooling unit 21b. .

  In the first optical path of the illumination optical system 3, as shown in FIGS. 6 and 7, the laser light emitted from the laser diode 8 of the first laser light source 6 is condensed by the condenser lens 31. The light condensed by the condenser lens 31 is condensed by the condenser lens 32 toward the diffusion plate 33. The laser light that has entered the diffusion plate 33 is diffused and enters the condenser lens 34. The light that has entered the condenser lens 34 enters the dichroic mirror 35. The dichroic mirror 35 transmits light having a blue wavelength and reflects light having a longer wavelength than the green wavelength. Therefore, the dichroic mirror 35 transmits the blue laser light emitted from the first laser light source 6 and reflects the yellow light emitted from the phosphor layer 12b of the phosphor wheel 12 described above. The yellow light reflected by the dichroic mirror 35 and the blue laser light transmitted through the dichroic mirror 35 enter the condenser lens 36 and exit from the illumination optical system 3. The light emitted from the illumination optical system 3 enters the image generation optical system 4.

  In the second optical path of the illumination optical system 3, as shown in FIGS. 6 and 7, the laser light emitted from the laser diode 8 of the second laser light source 7 is condensed by the condenser lens 41. The light condensed by the condenser lens 41 is condensed by the condenser lens 42 toward the diffusion plate 43. The light that has entered the diffusion plate 43 is diffused and enters the light tunnel 44. The light tunnel 44 is a hollow optical element, and the upper, lower, left and right inner surfaces of the inside are configured as reflection mirrors. Light that has entered the light tunnel 44 is reflected a plurality of times on the inner surface of the light tunnel 44. As a result, the illuminance distribution of the light at the emission part of the light tunnel 44 is made uniform. As a modification, a rod lens (rod integrator) may be used instead of the light tunnel 44.

  The light emitted from the light tunnel 44 is collected by the condenser lens 45. The light collected by the condenser lens 45 enters the dichroic mirror 46. The dichroic mirror 46 reflects light having a blue wavelength and transmits light having a wavelength longer than the green wavelength. The blue laser light reflected by the dichroic mirror 46 passes through the condenser lenses 13a, 13b, and 13c and irradiates the phosphor layer 12b of the phosphor wheel 12. The phosphor is excited by the blue laser light and emits yellow fluorescent light.

  The yellow light emitted from the phosphor is condensed by the condensing lenses 13a, 13b, 13c and enters the dichroic mirror 46. The yellow light that has entered the dichroic mirror 46 passes through the dichroic mirror 46 and enters the condenser lens 47. The yellow light that has entered the condenser lens 47 enters the dichroic mirror 35. The yellow light that has entered the dichroic mirror 35 is reflected by the dichroic mirror 35 and enters the condenser lens 36.

  In the image generation optical system 4 included in the projection display device 1, light emitted from the condenser lens 36 of the illumination optical system 3 enters the light tunnel 51 as shown in FIG. Light incident on the light tunnel 51 is reflected a plurality of times on the inner surface of the light tunnel 51. As a result, the illuminance distribution of the light at the emission part of the light tunnel 51 is made uniform. The light emitted from the light tunnel 51 is white light that is a combined light of yellow light and blue light. The white light passes through the condenser lenses 52 and 53 and is reflected by the mirror 54. The white light reflected by the mirror 54 passes through a condenser lens 55 and enters a TIR (total internal reflection) prism 56. Light that has entered the TIR prism 56 is totally internally reflected and enters the color prism 57. The color prism 57 splits the white light into green light, red light, and blue light.

  The light split by the color prism 57 is incident on a DMD (digital mirror device) as an image element that modulates the light according to an image signal. The green light split by the color prism 57 enters a green light DMD 58. Similarly, the red light split by the color prism 57 enters a DMD (not shown) for red light, and the blue light split by the color prism 57 enters a DMD (not shown) for blue light. . As a modification, a liquid crystal panel (LCD) may be used instead of the DMD as the image element.

  The DMD 58 has a large number of micromirrors arranged in a matrix, and each micromirror corresponds to a pixel of an image to be projected. The angle of each micro mirror is configured to be adjustable. The light incident on the micromirrors having a certain angle is reflected toward the projection lens 59. Therefore, the green light, red light and blue light reflected by each DMD enter the color prism 57 and are synthesized by the color prism 57. The light synthesized by the color prism 57 passes through the TIR prism 56 and the projection lens 59 and is projected on a projection surface such as a screen.

  The operation of cooling the phosphor wheel 12 by the fan 15 and the duct 16 in the cooling structure 11 of the illumination optical system configured as described above will be described.

  The cooling air sent from the fan 15 flows inside the duct 16 along the partition wall 19 and is blown to both surfaces of the substrate 12 a of the phosphor wheel 12. The cooling air blown to the surface of the phosphor wheel 12 on the side of the phosphor layer 12b passes through the ventilation path 23 of the lens holder 22, the space on the outer peripheral side of the holding portion 22a of the lens holder 22, and the cooling air. Flows smoothly along the surface. Thus, the cooling air sent from the fan 15 is guided along the duct 16 and effectively cools the entire phosphor wheel 12.

  The cooling air that has cooled the phosphor layer 12b of the phosphor wheel 12 flows along the partition wall 19 and is cooled by the heat exchanger 21. The air cooled by the heat exchanger 21 is discharged from the duct 16 and circulates through the interior of the illumination optical system 3 to the fan 15 as indicated by an arrow in FIG. Therefore, the fan 15 can send the cooling air cooled by the heat exchanger 21 to the phosphor wheel 12, and the cooling efficiency of the phosphor is enhanced.

  The cooling unit 21 b of the heat exchanger 21 is cooled by cooling air sent from the fan 27. The heat sink 24 is cooled by cooling air that has cooled the cooling unit 21b. When the heat sink 24 is cooled, the phosphor layer 12b of the phosphor wheel 12 is cooled.

  In the present embodiment, compared to a configuration in which a fan is simply arranged near the phosphor wheel in the housing of the projection display device, the air around the phosphor wheel 12 is cooled by the cooling air guided along the duct 16. Can be cooled. Thereby, the phosphor can be efficiently cooled.

  In addition, the lens holder 22 disposed in the duct 16 has the ventilation path 23 to prevent the cooling air sent from the fan 15 from being interrupted. Due to the synergistic effect of each component for increasing the ventilation of the cooling air, the cooling efficiency of the phosphor is enhanced.

  As described above, the cooling structure 11 of the illumination optical system according to the first embodiment includes the duct 16 that guides the cooling air sent from the fan 15 to the phosphor wheel 12. Thus, the temperature of the air around the phosphor wheel 12 is reduced by the cooling air guided along the duct 16, and the phosphor can be efficiently cooled. As a result, the cooling structure 11 can enhance the cooling efficiency of the phosphor and prevent the illuminance of the light emitted from the illumination optical system 3 from decreasing.

  Further, the lens holder 22 has a space between the holding portion 22a and the bottom plate of the lower cover 10b, thereby preventing the cooling air sent from the fan 15 from being obstructed. It is possible to sufficiently supply the cooling air to the surface on the layer 12b side. Further, the lens holder 22 prevents the flow of the cooling air sent from the fan 15 from being hindered by the holding portion 22 a having the ventilation path 23, and cools the surface of the phosphor wheel 12 on the phosphor layer 12 b side. The wind can flow smoothly. As a result, the effect of cooling the phosphor can be enhanced.

  In addition, the cooling structure 11 includes the heat exchanger 21 to prevent the temperature of the cooling air sent by the fan 15 from rising, and to cool the phosphor wheel 12 more efficiently. Further, the cooling structure 11 includes the heat sink 24 so that the heat of the phosphor wheel 12 can be released to the outside of the duct 16.

(Second embodiment)
Next, the cooling structure of the second illumination optical system will be described. In the illumination optical system including the cooling structure of the second embodiment, for convenience of explanation, the same components as those of the illumination optical system of the first embodiment are denoted by the same reference numerals as those of the first embodiment, and will be described. Omitted.

  FIG. 10 is a perspective view illustrating the cooling structure of the illumination optical system according to the second embodiment. FIG. 11 is a plan view of a cooling structure of the illumination optical system according to the second embodiment. FIG. 12 is an enlarged plan view of the cooling structure of the illumination optical system according to the second embodiment. FIG. 13 is a perspective view of a duct and a lens holder of the cooling structure of the illumination optical system according to the second embodiment.

  As shown in FIGS. 10 and 11, the cooling structure 61 of the illumination optical system according to the second embodiment includes a duct 66 having a dividing wall 69 for dividing an internal space, and a duct 66 divided by the dividing wall 69. A first fan 67a and a second fan 67b for sending cooling air to each space are provided.

  As shown in FIGS. 12 and 13, between the first and second fans 67a and 67b and the phosphor wheel 12 inside the duct 66, an internal space of the duct 66 is formed on one surface of the substrate 12a. Is provided, and a dividing wall 69 is provided which divides the first space into a second space including the other surface of the substrate 12b. The dividing wall 69 is provided along the partition wall 19 from one end of the duct 66 to a position adjacent to the phosphor wheel 12. As shown in FIG. 13, at one end of the duct 66, an opening 66a connected to the air outlet of the first fan 67a and an opening 66b connected to the air outlet of the second fan 67b are formed. .

  In the cooling structure 61 of the illumination optical system according to the second embodiment configured as described above, the cooling air sent from the first fan 67 a is separated from the internal space of the duct 66 by the dividing wall 69. , And is guided to one side of the phosphor wheel 12 on which the phosphor layer 12b is formed. Similarly, the cooling air sent from the second fan 67b flows through the other space of the internal space of the duct 66 partitioned by the dividing wall 69, and is guided to the other surface side of the phosphor wheel 12. . As described above, in the present embodiment, the cooling air is smoothly guided to both sides of the phosphor wheel 12.

  According to the cooling structure 61 of the illumination optical system of the second embodiment, by providing the dividing wall 69 and the first and second fans 67a and 67b, the cooling air is applied to both sides of the phosphor wheel 12 respectively. It is possible to guide the light smoothly, and the cooling efficiency of the phosphor can be further increased.

  The cooling structure of the illumination optical system according to the present invention has been used in the illumination optical system including the phosphor wheel, but may be used in another illumination optical system as needed. The present invention may be used, for example, in an illumination optical system using a color wheel having a color filter on which light from a light source enters, or in another illumination optical system using a phosphor having a fixed structure.

  As described above, the present invention has been described with reference to the exemplary embodiments. However, the present invention is not limited to the exemplary embodiments described above. Various changes that can be understood by those skilled in the art can be made to the configuration and details of the present invention within the scope of the present invention.

1 Projection display device
3 Illumination optical system
7. Second laser light source
11 Cooling structure
12 phosphor wheel
12a substrate 12b phosphor layer 15 fan
16 Duct
17a Rotary axis

Claims (5)

A phosphor member having a phosphor layer that emits fluorescence by excitation light emitted from a light source,
A duct that partitions an internal space and an external space in which the phosphor member is arranged, and guides cooling air to the phosphor member,
Of the duct, it provided downstream of the phosphor member, a cooling member for cooling the cooling air,
A heat dissipating member arranged outside the duct,
With
The cooling member has a heat receiving unit arranged inside the duct, and a cooling unit connected to the heat receiving unit and arranged outside the duct,
A cooling structure for an illumination optical system, wherein a heat-dissipating fan that sends another cooling air to the heat-dissipating member and the cooling unit is provided outside the duct. It is a cooling structure of the illumination optical system according to claim 1,
A lens disposed in the duct, for condensing the fluorescence emitted from the phosphor layer, and a lens holder disposed adjacent to the phosphor member and holding the lens,
A cooling structure for an illumination optical system, wherein a first ventilation path through which the cooling air passes is provided between the lens holder and the phosphor member. It is a cooling structure of the illumination optical system according to claim 1 or 2,
The phosphor member is formed of a substrate on which the phosphor layer is formed,
A cooling structure for an illumination optical system, wherein the substrate is configured to be rotatable. A cooling structure for an illumination optical system according to claim 3,
Lighting is provided within the duct, which divides the internal space into a first space including one surface of the substrate and a second space including the other surface of the substrate. Cooling structure of optical system. An illumination optical system including the cooling structure of the illumination optical system according to any one of claims 1 to 4 ,
A projection display apparatus comprising: an image generation optical system including an image element that modulates light emitted from the illumination optical system in accordance with an image signal.

Images