JP2018055127A - Cooling structure of illumination optical system, and projection type display device - Google Patents

Cooling structure of illumination optical system, and projection type display device Download PDF

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JP2018055127A
JP2018055127A JP2017236915A JP2017236915A JP2018055127A JP 2018055127 A JP2018055127 A JP 2018055127A JP 2017236915 A JP2017236915 A JP 2017236915A JP 2017236915 A JP2017236915 A JP 2017236915A JP 2018055127 A JP2018055127 A JP 2018055127A
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cooling
illumination optical
phosphor
fan
duct
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JP6468615B2 (en
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直樹 増田
Naoki Masuda
直樹 増田
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Necディスプレイソリューションズ株式会社
Nes Display Solutions Ltd
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Abstract

PROBLEM TO BE SOLVED: To provide a cooling structure of illumination optical system capable of preventing degradation of illuminance of light emitted from the illumination optical system by enhancing cooling efficiency of a fluorescent body, and a projection type display device.SOLUTION: Disclosed cooling structure of illumination optical system includes: a fluorescent body member (12) which has a fluorescent body layer that emits fluorescent light by receiving an excitation ray from a light source (7); a fan (15) for sending cooling air to the fluorescent body member (12); and a duct (16) that partitions an internal space in which the fluorescent body member (12) is disposed from the outside space and guides the cooling air sent from the fan (15) to the fluorescent body member (12).SELECTED DRAWING: Figure 7

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 when irradiated with excitation light has been proposed. This type of illumination optical system is used in, for example, a projection display device. FIG. 1 is a perspective view of a projection display device including an illumination optical system related 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 into which light enters 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 irradiated with laser light emitted from the laser light source 107. Yes.

  An illumination optical system including such a phosphor wheel is disclosed in Patent Document 1. Patent Document 1 discloses an illumination optical system including a phosphor unit having a phosphor wheel and a motor that rotates the phosphor wheel.

  The phosphor wheel disclosed in Patent Document 1 has a substrate that is rotatably provided around a rotation axis that is orthogonal to one surface. A phosphor region and a reflection region are formed on one surface of the substrate. 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 laser light. The laser beam irradiated by the phosphor wheel is repeatedly irradiated to the phosphor region and the reflection region of the rotating phosphor wheel. Thereby, the fluorescence emitted from the phosphor and the laser light reflected by the reflection region are emitted in order 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 with the irradiation of the laser light, and the light emission efficiency is lowered by the heat generation. Therefore, in order to prevent the illuminance of 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 having a phosphor wheel in which a concave portion is formed in the phosphor layer and a fan that blows cooling air toward the concave portion of the phosphor wheel. In the configuration disclosed in Patent Document 2, turbulent flow 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 the effect of heat diffusion.

International Publication No. 2012/127554 JP 2012-78707 A JP2013-25249A

  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 that the phosphor wheel itself receives when the phosphor wheel rotates. For this reason, the illumination optical system described in Patent Document 1 has a poor cooling effect for cooling the phosphor.

  In the configuration disclosed in Patent Document 2, cooling air is blown locally toward the laser light irradiation portion in the phosphor layer of the phosphor wheel. 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 side of a phosphor wheel on which one of the phosphor layers is formed is disposed in the vicinity of the phosphor wheel. However, in an illumination optical system using a phosphor wheel, a condensing lens for condensing fluorescence emitted from the phosphor layer is disposed adjacent to the phosphor layer. For this reason, the cooling air is blown onto the lens holder that holds the condenser lens, thereby preventing the flow, and it is difficult to sufficiently flow the cooling air to one surface of the phosphor wheel. As described above, in the configuration described in Patent Document 3, the cooling air is sent only to one surface side of the phosphor wheel, and the flow of the cooling air is obstructed by the lens holder, so that the phosphor cooling efficiency is low. There is.

  In addition, in general, in an illumination optical system using a laser light source, laser light leaks outside the illumination optical system 103 from other than the lens 111 that emits light from the illumination optical system 103, as shown in FIGS. It is covered with the cover 110 so that there is no. 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 atmospheric temperature inside the cover 110 is likely to rise, and the air inside the cover 110 is easily heated by the heat generated by the laser light source 107 and becomes high temperature. Therefore, the ambient air received by the phosphor wheel 112 arranged inside the cover 110 is also in a high temperature state, and there is a problem that the cooling efficiency of the phosphor is low.

  Therefore, since the illumination optical system related to the present invention described above has a low cooling efficiency of the phosphor, the temperature of the phosphor easily rises, and the illuminance of the light emitted from the illumination optical system decreases. 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 for an illumination optical system and a projection display device that can improve the cooling efficiency of the phosphor and prevent the illuminance of light emitted from the illumination optical system from being lowered. .

  In order to achieve the above-described object, a cooling structure for an illumination optical system according to the present invention includes a phosphor member having a phosphor layer that emits fluorescence by excitation light emitted from a light source, and a fan that sends cooling air to the phosphor member. And a duct that partitions the internal space where the phosphor member is disposed from the external space and guides the cooling air sent from the fan to the phosphor member.

  In addition, a projection display device according to the present invention includes an illumination optical system including the illumination optical system cooling structure, and an image generation optical system including an image element that modulates light emitted from the illumination optical system in accordance with an image signal. And comprising.

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

It is a perspective view which shows a projection type display apparatus provided with the illumination optical system relevant to this invention. It is a perspective view which shows the illumination optical system relevant to this invention. It is a top view which shows the illumination optical system relevant to this invention. 1 is a perspective view showing a perspective view of a projection display device according to a first embodiment. It is a perspective view which shows the illumination optical system with which the projection display apparatus of 1st Embodiment is provided. It is a perspective view shown in order to demonstrate the cooling structure of the illumination optical system of 1st Embodiment. It is a top view which shows the cooling structure of the illumination optical system of 1st 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 in order to demonstrate the cooling structure of the illumination optical system of 2nd Embodiment. It is a top view which shows the cooling structure of the illumination optical system of 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 which shows the duct and lens holder which the cooling structure of the illumination optical system of 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 device according to the first embodiment seen through. FIG. 5 is a perspective view of an illumination optical system provided in the projection display apparatus according to the first embodiment. FIG. 6 is a perspective view for explaining the cooling structure of the illumination optical system of 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, the projection display apparatus 1 of the first embodiment is illuminated with light from the illumination optical system 3 using the phosphor and the illumination optical system 3 and projects onto the projection surface. And 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 emitted from the first laser light source 6. A first optical component group that constitutes an optical path; and a second optical component group that constitutes a second optical path of laser light emitted from the second laser light source. 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, the first and second laser light sources 6 and 7 have a plurality of laser diodes 8 that emit blue laser light having a blue wavelength, and a plurality of laser diodes 8 on a plane. Are arranged. The first and second laser light sources 6 and 7 are not limited to those emitting blue laser light. As the 1st and 2nd laser light sources 6 and 7, what emits light of other wavelengths, 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 condenses the phosphor wheel 12 that emits fluorescence when irradiated with the laser light emitted from the second laser light source 7 and the fluorescence emitted from the phosphor wheel 12. A plurality of condensing lenses 13a, 13b, and 13c. The illumination optical system 3 includes a cooling structure 11 for cooling the phosphor wheel 12.

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

  As shown in FIGS. 7 and 8, the illumination optical system cooling structure 11 of the first embodiment includes a phosphor layer 12b that emits fluorescence by laser light as excitation light emitted from the second laser light source 7. A phosphor wheel 12 as a phosphor member, a fan 15 that sends cooling air to the phosphor wheel 12, an internal space where the phosphor wheel 12 is disposed, and an external space, and the cooling air sent from the fan 15 And a duct 16 that guides the phosphor 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 around a rotation shaft 17a parallel to a direction orthogonal to the main surface of the substrate 12a. The wheel motor 17 is attached on the 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.

  In addition, although the phosphor wheel 12 of this embodiment was comprised so that only yellow light might be emitted, it 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 light in the phosphor layer.

  By using the phosphor wheel 12, the irradiation position of the laser light changes with the rotation of the phosphor wheel 12, so that it is possible to prevent the phosphor temperature from being biased in each part of the phosphor layer 12 b. For this reason, it is suppressed that the conversion efficiency to fluorescence falls in a part of fluorescent substance layer 12b, and it can make it easy to obtain fluorescence stably.

  The fan 15 is disposed inside the cover 10. A sirocco fan is used as the fan 15 and has a blower opening for sending cooling air.

  As shown in FIGS. 6 and 7, the duct 16 is arranged inside the cover 10, and sends the cooling air sent from the fan 15 in a direction orthogonal to the rotation shaft 17 a of the wheel motor 17. A partition wall 19 is provided. 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 10 a, a bottom plate and a side plate of the lower cover 10 b, and is provided inside the cover 10. Thus, the duct 16 has an internal space closed by the partition wall 19, the top plate of the upper cover 10 a, the bottom plate and the side plate of the lower cover 10 b, and the internal space is the cooling air sent from the fan 15. It is comprised as a flow path.

  As shown in FIG. 9, an opening 16 a connected to the blower opening of the fan 15 is provided at one end of the duct 16. 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. Moreover, as shown in FIG. 7, the other end of the duct 16 has a cross-sectional area of the flow path expanded. By expanding the cross-sectional area of the flow path at the other end of the duct 16, the amount of cooling air blown against the heat exchanger 21 is increased.

  As shown in FIGS. 6 and 7, the heat exchanger 21 includes a heat receiving portion 21a disposed inside the other end of the duct 16, a cooling portion 21b disposed outside the duct 16, and a heat receiving portion 21a. And a heat transfer section 21c that transfers heat to the cooling section 21b. The heat exchanger 21 cools the phosphor wheel 12 by removing heat from the warm wind. Since the heat exchanger 21 is arranged in the duct 16 in this way, it becomes possible to circulate the cooling air cooled by the heat exchanger 21 to the fan 15, and the fluorescence using the cooling air sent from the fan 15. Body cooling efficiency is increased. As the heat exchanger, a liquid cooling type cooling mechanism that circulates and cools the liquid may be used.

  As shown in FIG. 8, the phosphor wheel 12 and the wheel motor 17 are disposed inside the duct 16. Further, inside the duct 16, a plurality of condenser lenses 13a, 13b, and 13c, a lens holder 22 that holds the plurality of condenser lenses 13a, 13b, and 13c, and a phosphor layer 12b of the phosphor wheel 12 are 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 portion of each 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 in alignment with the partition wall 19 of the duct 16 and is configured as a part of the partition wall 19.

  By configuring the lens holder 22 as described above, the first air passage 23a through which the cooling air flows is secured between the holding portion 22a and the bottom plate of the lower cover 10b. Sexuality is enhanced. This prevents the cooling air sent from the fan 15 from being blocked by the lens holder 22, and allows the cooling air to flow smoothly along the partition wall 19 of the duct 16.

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

  Further, 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 portion 17b of the rotating shaft 17a which the wheel motor 17 has. As shown in FIG. 8, a heat conductive sheet 25 is sandwiched between the bearing portion 17 b and the heat sink 24, and heat is transferred from the bearing portion 17 b to the heat sink 24 via the heat conductive sheet 25, and from the heat sink 24. Heat is released. Thus, the cooling effect of the phosphor of the phosphor wheel 12 is enhanced by using the heat sink 24. As a modification, instead of the structure in which the heat conductive sheet 25 is in contact with the bearing portion 17b, the heat conductive sheet 25 may be in a structure in direct 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 that is outside the duct 16. . Outside the duct 16, the heat sink 24 and the cooling part 21 c are arranged at positions facing each other.

  As the fan 27, a propeller fan is used. As shown in FIG. 4, the projection display device 1 according to the present embodiment includes a housing 9 in which the illumination optical system 3 is provided, and is located at a position facing the cooling unit 21 b inside the housing 9. A fan 27 is 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 onto the heat sink 24. Thereby, it becomes possible to cool the cooling part 21b and the heat sink 24 efficiently 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 blown to the heat sink 24. However, the present invention is not limited to this configuration. As a modification, it goes without saying 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 toward the diffusion plate 33 by the condenser lens 32. The laser light incident on the diffusion plate 33 is diffused and enters the condenser lens 34. The light incident on 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 are emitted 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, the laser light emitted from the laser diode 8 of the second laser light source 7 is condensed by the condenser lens 41 as shown in FIGS. 6 and 7. The light condensed by the condenser lens 41 is condensed toward the diffusion plate 43 by the condenser lens 42. The light incident on the diffusion plate 43 is diffused and enters the light tunnel 44. The light tunnel 44 is a hollow optical element, and the inner surfaces of the upper, lower, left and right sides are configured as reflection mirrors. Light incident on 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 exit portion 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 condensed 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 is irradiated on the phosphor layer 12b of the phosphor wheel 12. The phosphor is excited by blue laser light and emits yellow fluorescence.

  The yellow light emitted from the phosphor is condensed by the condenser lenses 13 a, 13 b, and 13 c and enters the dichroic mirror 46. The yellow light incident on 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 incident on 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, the light emitted from the condenser lens 36 of the illumination optical system 3 enters the light tunnel 51 as shown in FIG. 4. The 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 exit portion 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 the condenser lens 55 and enters a TIR (total internal reflection) prism 56. The light incident on the TIR prism 56 is totally reflected inside and enters the color prism 57. The color prism 57 splits 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 is incident on the DMD 58 for green light. Similarly, red light dispersed by the color prism 57 enters a DMD (not shown) for red light, and blue light dispersed by the color prism 57 enters a DMD for blue light (not shown). . 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 micromirror is configured to be adjustable. Light incident on the micromirror 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 combined 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 onto a projection surface such as a screen.

  With respect to the cooling structure 11 of the illumination optical system configured as described above, an operation in which the phosphor wheel 12 is cooled by the fan 15 and the duct 16 will be described.

  Cooling air sent from the fan 15 flows along the partition wall 19 in the duct 16 and is blown onto 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 phosphor layer 12b side passes through the air passage 23 of the lens holder 22 and the space on the outer peripheral side of the holding portion 22a of the lens holder 22, and the phosphor layer 12b side. Flows smoothly along the surface. In this manner, the cooling air sent from the fan 15 is guided along the duct 16 to effectively cool the entire phosphor wheel 12.

  The cooling air that has cooled the phosphor layer 12 b of the phosphor wheel 12 flows along the partition walls 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 inside 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 the cooling air sent from the fan 27. The heat sink 24 is cooled by cooling air that cools the cooling unit 21b. By cooling the heat sink 24, the phosphor layer 12b of the phosphor wheel 12 is cooled.

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

  In addition, the lens holder 22 disposed in the duct 16 has the air passage 23 to prevent the flow of the cooling air sent from the fan 15 from being obstructed. The cooling efficiency of the phosphor is enhanced by the synergistic effect of each configuration for enhancing the air permeability of the cooling air.

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

  In addition, the lens holder 22 has a space between the holding portion 22a and the bottom plate of the lower cover 10b, thereby preventing the flow of the cooling air sent from the fan 15 from being obstructed. Cooling air can be sufficiently supplied to the surface on the layer 12b side. Furthermore, the lens holder 22 prevents the cooling air flow sent from the fan 15 from being obstructed by the holding portion 22a having the air passage 23, and cools the surface of the phosphor wheel 12 on the phosphor layer 12b side. The wind can flow smoothly. As a result, the phosphor cooling effect can be enhanced.

  In addition, the cooling structure 11 includes the heat exchanger 21, thereby preventing the temperature of the cooling air sent by the fan 15 from rising and cooling the phosphor wheel 12 more efficiently. Moreover, the cooling structure 11 can release the heat of the phosphor wheel 12 to the outside of the duct 16 by including the heat sink 24.

(Second Embodiment)
Next, the cooling structure of the second illumination optical system will be described. In the illumination optical system having 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. Omitted.

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

  As shown in FIGS. 10 and 11, the cooling structure 61 of the illumination optical system of the second embodiment includes a duct 66 having a dividing wall 69 that divides the internal space, and a duct 66 divided by the dividing wall 69. A first fan 67a and a second fan 67b that send 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, the internal space of the duct 66 is formed on one surface of the substrate 12a. A dividing wall 69 is provided that divides the first space including the second space and the second space including the other surface of the substrate 12b. The dividing wall 69 is provided so as to extend 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 illumination optical system cooling structure 61 of the second embodiment configured as described above, the cooling air sent from the first fan 67a is divided by the dividing wall 69 in the internal space of the duct 66. And is guided to one surface side of the phosphor wheel 12 on which the phosphor layer 12b is formed. Similarly, the cooling air sent from the second fan 67 b 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. . Thus, in the present embodiment, the cooling air is smoothly guided to both sides of the phosphor wheel 12.

  According to the illumination optical system cooling structure 61 of the second embodiment, the partition wall 69 and the first and second fans 67a and 67b are provided so that the cooling air is supplied to both surfaces of the phosphor wheel 12, respectively. It becomes possible to guide smoothly, and the cooling efficiency of the phosphor can be further increased.

  Note that the illumination optical system cooling structure according to the present invention is used in an illumination optical system including a phosphor wheel, but may be used in other illumination optical systems as necessary. The present invention may be used in, for example, an illumination optical system using a color wheel having a color filter on which light from a light source is incident, and other illumination optical systems using a phosphor having a fixed structure.

  The present invention has been described above with reference to the embodiments. However, the present invention is not limited to the above-described embodiments. 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
3 Illumination optics
7 Second laser light source
11 Cooling structure
12 Phosphor wheel
12a substrate
12b phosphor layer
15 fans
16 Duct
17a Rotating shaft

In order to achieve the above object, a cooling structure for an illumination optical system according to the present invention includes a phosphor member having a phosphor layer that emits fluorescence by excitation light emitted from a light source, and a fan that sends cooling air to the phosphor member And a duct that divides the internal space where the phosphor member is disposed from the external space, guides the cooling air sent from the fan to the phosphor member, and is disposed adjacent to the phosphor member and is emitted from the phosphor layer. And a lens holder for holding the lens , and a first air passage through which the cooling air sent from the fan passes is provided between the lens holder and the duct. .

Claims (10)

  1. A phosphor member having a phosphor layer that emits fluorescence by excitation light emitted from a light source;
    A fan for sending cooling air to the phosphor member;
    A duct that divides the internal space and the external space in which the phosphor member is disposed, and that guides cooling air sent from the fan to the phosphor member;
    A cooling structure for an illumination optical system.
  2. A cooling structure for an illumination optical system according to claim 1,
    The phosphor member comprises a substrate on which the phosphor layer is formed,
    The substrate has a cooling structure for an illumination optical system configured to be rotatable.
  3. A cooling structure for an illumination optical system according to claim 1 or 2,
    In the duct, between the fan and the phosphor member, the internal space includes a first space including one surface of the substrate, and a second space including the other surface of the substrate. A cooling structure of an illumination optical system provided with a dividing wall that is divided into two.
  4. The illumination optical system cooling structure according to claim 3,
    The cooling structure for an illumination optical system, wherein the fan includes a first fan that sends cooling air to the first space and a second fan that sends cooling air to the second space.
  5. An illumination optical system cooling structure according to any one of claims 1 to 4,
    A lens that is disposed in the duct and collects fluorescence emitted from the phosphor layer; and a lens holder that is disposed adjacent to the phosphor member and holds the lens.
    A cooling structure for an illumination optical system, wherein a first air passage through which cooling air sent from the fan is passed is provided between the lens holder and the phosphor member.
  6. A cooling structure for an illumination optical system according to claim 5,
    The lens holder has a holding portion that holds an outer peripheral portion of the lens,
    A cooling structure for an illumination optical system, wherein the holding portion is provided with a second air passage through which cooling air sent from the fan is passed.
  7. A cooling structure for an illumination optical system according to any one of claims 1 to 6,
    A cooling structure for an illumination optical system, wherein a cooling member for cooling cooling air is provided on the downstream side of the phosphor member in the duct.
  8. A cooling structure for an illumination optical system according to any one of claims 1 to 7,
    A cooling structure for an illumination optical system, comprising a heat dissipating member arranged outside the duct.
  9. The illumination optical system cooling structure according to claim 7,
    A heat dissipating member disposed outside the duct;
    The cooling member has a heat receiving portion disposed inside the duct, and a cooling portion connected to the heat receiving portion and disposed outside the duct,
    A cooling structure of an illumination optical system, wherein a heat radiating fan for sending cooling air to the heat radiating member and the cooling unit is provided outside the duct.
  10. An illumination optical system including the illumination optical system cooling structure according to any one of claims 1 to 9,
    An image generation optical system including an image element that modulates light emitted from the illumination optical system according to an image signal.
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