JP2005084112A - Light source device and projection type display apparatus - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a light source which realizes illumination with high luminance and to provide a projection type display apparatus using the light source device. <P>SOLUTION: The light source device includes: a solid light source 11r which emits light; a cooling fluid which exchanges heat with the solid light source 11r; and a space 15 in which the cooling fluid flows, wherein an inflow passage 16 into which the cooling fluid flows and an outflow passage 17 from which the cooling fluid flows are connected to the space 15, and wherein the inflow passage 16 and the outflow passage 17 are disposed such that the axial lines of the inflow and outflow passages 16 and 17 are twisted in a positional relation. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a light source device and a projection display device.

  In conventional projectors (projection display devices), a halogen lamp has been used as a light source in the past, and a high-pressure mercury lamp (UHP) having high luminance and high efficiency has been used in recent years. A light source using UHP, which is a discharge lamp, requires a high-voltage power circuit, is large and heavy, and hinders the reduction in size and weight of the projector. Further, although it has a longer life than a halogen lamp, it still has a short life, and it is almost impossible to control the light source (fast lighting, extinguishing, modulation), and it takes a long time to start up.

Therefore, recently, an LED illuminant has attracted attention as a new light source. LEDs are ultra-compact, ultra-light, and have a long life. In addition, by controlling the drive current, it is possible to freely turn on / off and adjust the amount of emitted light. In this respect, it is also promising as a light source for a projector, and application development to a small-sized and portable small-screen projector has already begun (for example, Patent Document 1).
JP-A-6-5923 JP-A-8-116138

  However, at present, it is difficult to obtain sufficient luminance in a projector using an LED as a light source. This is because the LED is still about 1/2 to 1/3 of UHP in terms of efficiency, and the amount of light that can be obtained even when a full current is injected is small. The above-mentioned efficiency is steadily improving year by year due to remarkable technological innovation, and may reach the level of the current UHP in a few years, but the situation will change at least for LED light source projectors that can be commercialized in the near future. There will be no. In order to increase the amount of light, there is a method of arraying LEDs. However, since this causes a reduction in the illumination light rate as an optical system due to an increase in the light emitting point, the effect is not so much obtained.

Therefore, a possible remaining method is to increase the light emission amount of the LED. However, as described above, there is a limitation on the rating of the LED, and the maximum light amount is automatically determined by the rating and efficiency. It is mainly the calorific value that determines the rated current of the LED.
Conventional LEDs have been devised to fill the package with a highly heat-conductive fluid such as silicon gel, but a sufficient heat dissipation effect has not been obtained. For this reason, the rated current cannot be increased and the maximum light output is reduced due to damage to the chip due to heat generation.

For example, in Patent Document 1, cooling is performed with a cooling fluid from the outside of the LED package, but the cooling capacity is insufficient to remove heat generated intensively in the LED, and the temperature of the LED is reduced in luminous efficiency. There was a problem that it was difficult to keep the temperature below the limit temperature.
In Patent Document 2, the light-emitting element is directly cooled by a cooling fluid. However, since the apparatus configuration is complicated and large, it causes an increase in etendue and makes it difficult to extract light that emits isotropically, resulting in a decrease in illumination efficiency. There was a problem to do.

  SUMMARY An advantage of some aspects of the invention is that it provides a light source device capable of high-intensity illumination and a projection display device using the light source device.

  In order to achieve the above object, a first light source device of the present invention includes a solid light source that emits light, a cooling fluid that exchanges heat with the solid light source, and a space in which the cooling fluid flows. An inflow channel into which the cooling fluid flows in and an outflow channel from which the cooling fluid flows out are connected to the space, and the center axis of the inflow channel and the center of the outflow channel The inflow channel and the outflow channel are arranged so as to have a twisted positional relationship with the axis.

That is, in the first light source device of the present invention, since the inflow channel and the outflow channel are arranged in a twisted positional relationship, the cooling fluid that has flowed into the space from the inflow channel flows in the space. It becomes turbulent and turbulent, and flows out from the outflow channel. Since the cooling fluid flow in the space is turbulent, a laminar boundary layer is not formed in the vicinity of the wall surface of the space, and heat generated in the solid light source can be efficiently transmitted to the cooling fluid. Further, in the turbulent flow, the fluid particles flow while moving irregularly, so that the heat transmitted from the solid light source is quickly transported to the cooling fluid that is not in contact with the wall surface of the space. Therefore, the temperature of the cooling fluid in contact with the wall surface of the space is unlikely to rise, and heat generated in the solid light source can be efficiently transmitted to the cooling fluid.
From the above, the heat generated in the solid light source can be efficiently radiated to the cooling fluid, and the temperature of the solid light source can be lowered. As a result, a large current can flow through the solid-state light source, and a large amount of light can be extracted and used for illumination.

More specifically, in order to realize the above configuration, the space is formed in a columnar shape, the inflow channel is connected to the center of the columnar upper or lower circle, and the outflow channel is formed on the columnar side surface. In addition to being connected, it is desirable that the central axis of the outflow channel be disposed so as to be substantially parallel to the tangential direction of the circle at the connection point.
According to this configuration, the cooling fluid flows into the cylindrical space from the inflow channel, collides with the upper surface or the lower surface facing the surface to which the inflow channel is connected, and flows along the side surface from the outflow channel. leak. Therefore, the flow of the cooling fluid in the space becomes a turbulent flow, the heat generated in the solid light source can be efficiently transmitted to the cooling fluid, and the heat generated in the solid light source is efficiently radiated to the cooling fluid. Can do.

  In order to achieve the above object, a second light source device of the present invention includes a solid light source that emits light, a cooling fluid that exchanges heat with the solid light source, and a space in which the cooling fluid flows. An inflow channel into which a cooling fluid flows is connected to the space, and the inflow channel has turbulence generating means for changing the flow direction of the cooling fluid to turbulent flow. It is provided.

That is, in the second light source device of the present invention, the turbulent means is provided in the inflow channel, so that the cooling fluid flowing into the space is turbulent. Since the cooling fluid flow in the space is turbulent, a laminar boundary layer is not formed in the vicinity of the wall surface of the space, and heat generated in the solid light source can be efficiently transmitted to the cooling fluid. Further, in the turbulent flow, the fluid particles flow while moving irregularly, so that the heat transmitted from the solid light source is quickly transported to the cooling fluid that is not in contact with the wall surface of the space. Therefore, the temperature of the cooling fluid in contact with the wall surface of the space is unlikely to rise, and heat generated in the solid light source can be efficiently transmitted to the cooling fluid.
From the above, the heat generated in the solid light source can be efficiently radiated to the cooling fluid, and the temperature of the solid light source can be lowered. As a result, a large current can flow through the solid-state light source, and a large amount of light can be extracted and used for illumination.

In order to realize the above configuration, more specifically, the turbulence generating means may be a concave portion formed in a spiral shape on the inner surface of the inflow channel.
According to this configuration, since the spiral recess is formed on the inner surface of the inflow channel, the cooling fluid flowing through the inflow channel flows while spirally turning along the recess. Therefore, the cooling fluid flows into the space while swirling spirally, and the flow of the cooling fluid in the space becomes a turbulent flow. Since the flow of the cooling fluid in the space is turbulent, the heat generated in the solid light source can be efficiently transferred to the cooling fluid, and the heat generated in the solid light source can be efficiently dissipated to the cooling fluid. Can do.

In order to realize the above configuration, more specifically, a spiral plate in which the turbulence generating means is disposed inside the inflow channel may be used.
According to this configuration, since the spiral plate is arranged inside the inflow channel, the cooling fluid flowing through the inflow channel flows while spirally turning along the plate. Therefore, the cooling fluid flows into the space while swirling spirally, and the flow of the cooling fluid in the space becomes a turbulent flow. Since the flow of the cooling fluid in the space is turbulent, the heat generated in the solid light source can be efficiently transferred to the cooling fluid, and the heat generated in the solid light source can be efficiently dissipated to the cooling fluid. Can do.

In order to realize the above-described configuration, more specifically, the turbulence generating means may be a fin that changes the flow direction of the cooling fluid disposed inside the inflow channel.
According to this configuration, since the fins that change the direction of the flow of the cooling fluid are arranged inside the inflow channel, the cooling fluid that flows through the inflow channel changes the direction of the flow by the fins and becomes a turbulent flow. . Therefore, the cooling fluid flows into the space in a turbulent state, and the flow of the cooling fluid in the space becomes a turbulent flow. Since the flow of the cooling fluid in the space is turbulent, the heat generated in the solid light source can be efficiently transferred to the cooling fluid, and the heat generated in the solid light source can be efficiently dissipated to the cooling fluid. Can do.

  In order to achieve the above object, a third light source device of the present invention includes a solid light source that emits light, a cooling fluid that exchanges heat with the solid light source, and a space in which the cooling fluid flows. An inflow channel into which a cooling fluid flows is connected to the space so that the central axis of the inflow channel does not pass through the center of gravity when the space is regarded as an object. Is arranged.

That is, the third light source device of the present invention is arranged so that the inflow channel does not face the center of gravity when the space is regarded as an object, so that the cooling fluid flows in a biased manner in the space, It becomes easy to form a vortex. Therefore, the flow of the cooling fluid in the space tends to be turbulent, and a laminar boundary layer is not formed in the vicinity of the wall surface of the space, so that heat generated in the solid light source can be efficiently transmitted to the cooling fluid. Further, in the turbulent flow, the fluid particles flow while moving irregularly, so that the heat transmitted from the solid light source is quickly transported to the cooling fluid that is not in contact with the wall surface of the space. Therefore, the temperature of the cooling fluid in contact with the wall surface of the space is unlikely to rise, and heat generated in the solid light source can be efficiently transmitted to the cooling fluid.
From the above, the heat generated in the solid light source can be efficiently radiated to the cooling fluid, and the temperature of the solid light source can be lowered. As a result, a large current can flow through the solid-state light source, and a large amount of light can be extracted and used for illumination.

More specifically, in order to realize the above configuration, a light source including a solid light source that emits light, a cooling fluid that exchanges heat with the solid light source, and a space in which the cooling fluid flows. An inflow channel into which cooling fluid flows in and an outflow channel from which cooling fluid flows out are connected to the space, and the positional relationship between the inflow channel and the outflow channel is the above-described aspect of the present invention. Therefore, the turbulence generating means of the present invention may be provided in the inflow channel.
According to this configuration, the arrangement relationship between the inflow channel and the outflow channel is the arrangement relationship of the present invention, and the turbulence generating means of the present invention is provided in the inflow channel. The cooling fluid flow is more turbulent. Therefore, since the heat generated in the solid light source can be more efficiently transmitted to the cooling fluid, the heat generated in the solid light source can be efficiently dissipated to the cooling fluid, and the temperature of the solid light source can be lowered. it can. As a result, a large current can flow through the solid-state light source, and a large amount of light can be extracted and used for illumination.

More specifically, in order to realize the above configuration, a light source including a solid light source that emits light, a cooling fluid that exchanges heat with the solid light source, and a space in which the cooling fluid flows. An inflow channel into which cooling fluid flows in and an outflow channel from which cooling fluid flows out are connected to the space, and the positional relationship between the inflow channel and the outflow channel is the above-described aspect of the present invention. In this arrangement relationship, the arrangement relationship between the inflow channel and the space may be the arrangement relationship of the present invention.
According to this configuration, the arrangement relationship between the inflow channel and the outflow channel is the arrangement relationship of the present invention, and the arrangement relationship between the inflow channel and the space is the arrangement relationship of the present invention. The cooling fluid flow is more turbulent. Therefore, since the heat generated in the solid light source can be more efficiently transmitted to the cooling fluid, the heat generated in the solid light source can be efficiently dissipated to the cooling fluid, and the temperature of the solid light source can be lowered. it can. As a result, a large current can flow through the solid-state light source, and a large amount of light can be extracted and used for illumination.

  A projection display device according to the present invention is a projection display device including a light source device, a light modulation unit that modulates light from the light source device, and a projection unit that projects light modulated by the light modulation unit. The light source device is the light source device of the present invention.

  That is, the projection type display apparatus of the present invention can project a bright image by taking out a large amount of light from the light source apparatus by using the light source apparatus of the present invention.

[First Embodiment]
Hereinafter, a first embodiment of the present invention will be described with reference to FIGS.
FIG. 1 is a schematic diagram showing the overall configuration of a projection display device according to the present embodiment. In all the drawings below, the film thicknesses and dimensional ratios of the constituent elements are appropriately changed in order to make the drawings easy to see.
The projection display device 1 of the present embodiment is a three-plate type liquid crystal projector, and as shown in FIG. 1, a light source device 10R capable of emitting R (red), G (green), and B (blue) color lights, respectively. 10G, 10B, transmissive liquid crystal light valves (light modulating means) 20R, 20G, 20B for modulating each emitted color light, a dichroic cross prism 30 for synthesizing each modulated color light into a color image, And a projection lens (projection means) 40 that projects the synthesized color image.

FIG. 2 is a cross-sectional view of a light source device provided in the projection display device. FIG. 3 is a bottom view of the light source device.
Since the light source devices 10R, 10G, and 10B have the same configuration and are different only in solid light sources (LED chips) that emit light, the configuration of the light source device 10R will be described, and the description of the light source devices 10G and 10B will be omitted.
As shown in FIG. 2, the light source device 10R includes an LED chip (solid light source) 11r that emits R color light, a substrate 12 on which the LED chip 11r is mounted, and a lens that collimates the emitted light of the LED chip 11r. 13 and a circulation pump (not shown) for circulating a cooling fluid C for cooling the LED.
The substrate 12 is made of a material having high thermal conductivity (for example, Al), and also serves as a heat sink for releasing heat. On the upper surface of the substrate 12, an LED chip (solid light source) 11r is placed, and a recess 14 for reflecting the emitted light of the LED chip 11r is formed, and a side surface 14a of the recess 14 is inclined toward the lens 13 toward the outside. It is formed as follows. Therefore, the colored light incident on the side surface 14 a is reflected toward the lens 13.
As shown in FIGS. 2 and 3, a flat cylindrical cooling chamber (space) 15 is formed inside the substrate 12. In the cooling chamber 15, the inflow channel 16 for the cooling fluid C is connected to the substantial center of the lower surface of the cooling chamber 15, and the central axis of the inflow channel 16 is substantially perpendicular to the lower surface of the cooling chamber 15. Has been placed. The cooling fluid outflow channel 17 is connected to the side surface of the cooling chamber 15 and is arranged so that the central axis of the outflow channel 17 is substantially parallel to the tangent at the connection point.

  In the present embodiment, water is used as the cooling fluid C, but other than water, it can be selected from liquids or gases that are non-corrosive to the members provided in the light source devices 10R, 10G, and 10B. Furthermore, a liquid or gas having a high thermal conductivity is desirable, and when a liquid cooling fluid C is used, a liquid having a low vapor pressure, a low freezing point, and excellent thermal stability is preferable.

  As shown in FIG. 1, between the light source devices 10R, 10G, and 10B and the corresponding liquid crystal light valves 20R, 20G, and 20B, the illuminance distribution of the illumination light is made uniform in the liquid crystal light valves 20R, 20G, and 20B. As the illuminance equalizing means 19 for the purpose, a first fly-eye lens 191 and a second fly-eye lens 192 are sequentially installed from the light source device side. The first fly-eye lens 191 forms a plurality of secondary light source images, and the second fly-eye lens 192 functions as a superimposing lens that superimposes them at the installation position of the liquid crystal light valve that is the illuminated area.

The liquid crystal light valves 20R, 20G, and 20B use TN (Twisted Nematic) mode active matrix type transmissive liquid crystal cells using thin film transistors (hereinafter abbreviated as TFTs) as pixel switching elements. Has been.
As shown in FIG. 1, the dichroic cross prism 30 has a structure in which four right-angle prisms are bonded together. A light reflecting film (not shown) made of a dielectric multilayer film is formed on the bonded surfaces 30a and 30b. It is formed in a shape. Specifically, the reflection surface 30a reflects the red image light formed by the liquid crystal light valve 20R and transmits the green and blue image lights formed by the liquid crystal light valves 20G and 20B, respectively. A light reflection that reflects the blue image light formed by the liquid crystal light valve 20B and transmits the red and green image light formed by the liquid crystal light valves 20R and 20G, respectively, is provided on the bonding surface 30b. A membrane is provided.

Next, the operation of the projection display device 1 having the above configuration will be described.
As shown in FIG. 1, each color light emitted from the light source devices 10R, 10G, and 10B passes through a first fly-eye lens 191 and a second fly-eye lens 192, respectively, and is related to the density distribution of the light. The liquid crystal light valves 20R, 20G, and 20B are irradiated at a uniform density.
Each color light incident on the liquid crystal light valves 20R, 20G, and 20B is modulated, incident on the dichroic cross prism 30, synthesized with a color image, and projected onto the screen 50 by the projection lens 40.

Next, the operation of the light source devices 10R, 10G, and 10B, which is a feature of the present invention, will be described.
Since the operations of the light source devices 10R, 10G, and 10B are the same, the operation of the light source device 10R will be described, and the description of the light source devices 10G and 10B will be omitted.
As shown in FIG. 2, the light source device 10R is supplied with electric power from an electrode (not shown) to the LED chip 11r, so that the LED chip 11r emits R color light and generates heat. The heat generated in the LED chip 11r is transferred to the substrate 12 and radiated to the cooling fluid C flowing in the cooling chamber 15, and the LED chip 11r is cooled.
The cooling fluid C is pumped into the inflow channel 16 by a circulation pump (not shown) and flows into the cooling chamber 15. The inflowing cooling fluid C collides with the upper surface of the cooling chamber 15 and flows toward the side surface, and also flows toward the outflow passage 17 along the side surface, forming a vortex in the cooling chamber 15 to become a turbulent flow. . Thereafter, the cooling fluid C flows out from the outflow channel 17, releases the absorbed heat in the heat radiating section (not shown), flows into the circulation pump, and is pumped again to the inflow channel 16.

According to the above configuration, since the cooling fluid C in the cooling chamber 15 is turbulent, a laminar boundary layer is not formed in the vicinity of the wall surface of the cooling chamber 15 and is generated in the LED chips 11r, 11g, and 11b. Heat can be efficiently transferred to the cooling fluid. In addition, since the fluid particles flow irregularly in the turbulent flow, the heat transmitted from the LED chips 11r, 11g, and 11b is quickly transported to the cooling fluid that is not in contact with the wall surface of the cooling chamber 15. Therefore, the temperature of the cooling fluid in contact with the wall surface of the cooling chamber 15 is unlikely to rise, and the heat generated in the LED chips 11r, 11g, and 11b can be efficiently transmitted to the cooling fluid.
Therefore, the heat generated in the LED chips 11r, 11g, and 11b can be efficiently radiated to the cooling fluid, and the temperature of the LED chips 11r, 11g, and 11b can be lowered. As a result, a large current can be passed through the LED chips 11r, 11g, and 11b, and a large amount of light can be extracted and used for illumination.

[Second Embodiment]
Next, a second embodiment of the present invention will be described with reference to FIG. 4 and FIG.
The basic configuration of the projection display device according to the present embodiment is the same as that of the first embodiment, but the light source device is different from that of the first embodiment. Therefore, in the present embodiment, only the periphery of the light source device will be described with reference to FIGS.
FIG. 4 is a cross-sectional view of a light source device provided in the projection display device. FIG. 5 is a bottom view of the light source device.
The light source devices 60R, 60G, and 60B have the same configuration and are different only in the solid light source (LED chip) that emits light. Therefore, the configuration of the light source device 60R will be described, and the description of the light source devices 60G and 60B will be omitted.
As shown in FIG. 4, the light source device 60R includes an LED chip (solid light source) 11r that emits R color light, a substrate 12 on which the LED chip 11r is mounted, and a lens that collimates the emitted light of the LED chip 11r. 13 and a circulation pump (not shown) for circulating a cooling fluid C for cooling the LED.

As shown in FIGS. 4 and 5, a flat cylindrical cooling chamber 15 (space) is formed inside the substrate 12. A cooling fluid inflow channel 66 is connected to the cooling chamber 15 substantially at the center of the lower surface of the cooling chamber 15, and the central axis of the inflow channel 66 is arranged substantially perpendicular to the lower surface of the cooling chamber 15. Has been. The cooling fluid outflow channel 17 is connected to the side surface of the cooling chamber 15 and is arranged so that the central axis of the outflow channel 17 is substantially parallel to the tangent at the connection point.
On the inner peripheral surface of the inflow channel 66, a spiral groove (concave portion, turbulent flow means) 67 having a V-shaped cross section is formed. The pitch and number of the spiral grooves 67, the groove depth, the cross-sectional shape, and the like can take various values in consideration of the flow velocity and viscosity of the cooling fluid C. It is preferable to select a value that makes the working fluid C turn.

Next, the operation of the light source devices 60R, 60G, and 60B, which is a feature of the present invention, will be described.
Since the operations of the light source devices 60R, 60G, and 60B are the same, the operation of the light source device 60R will be described, and the description of the light source devices 60G and 60B will be omitted.
As shown in FIG. 4, the light source device 60R is supplied with electric power from an electrode (not shown) to the LED chip 11r, so that the LED chip 11r emits R color light and generates heat. The heat generated in the LED chip 11r is transferred to the substrate 12 and radiated to the cooling fluid C flowing in the cooling chamber 15, and the LED chip 11r is cooled.
The cooling fluid C is pumped to the inflow channel 66 by a circulation pump (not shown) and flows through the inflow channel 66. The cooling fluid C flowing in the vicinity of the inner peripheral wall of the inflow channel 66 flows along the spiral groove 67 and becomes a swirl flow swirling spirally. The cooling fluid C flowing in the vicinity of the central axis of the inflow channel 66 is similarly swirled due to the influence of the swirling flow generated in the vicinity of the inner peripheral wall due to the viscosity of the cooling fluid C and the like. The cooling fluid C that has turned into the swirl flows into the cooling chamber 15, collides with the upper surface of the cooling chamber 15, flows toward the side surface, and flows toward the outflow channel 17 along the side surface. A vortex is formed in the turbulent flow. Thereafter, the cooling fluid C flows out from the outflow channel 17, releases the absorbed heat in the heat radiating section (not shown), flows into the circulation pump, and is pumped again to the inflow channel 16.

  According to the above configuration, since the spiral groove 67 is formed on the inner surface of the inflow channel 66, the cooling fluid C flowing through the inflow channel 66 flows while spirally turning along the spiral groove 67. Therefore, the cooling fluid C flows into the cooling chamber 15 while spirally turning, and the flow of the cooling fluid C in the cooling chamber 15 becomes a turbulent flow with more irregular and complicated fluctuations. Since the flow of the cooling fluid C in the cooling chamber 15 is a turbulent flow, the heat generated in the LED chips 11r, 11g, and 11b can be efficiently transmitted to the cooling fluid C, and the LED chips 11r, 11g, and 11b. Can be efficiently radiated to the cooling fluid C.

[Third Embodiment]
Next, a third embodiment of the present invention will be described with reference to FIG.
The basic configuration of the projection display device according to the present embodiment is the same as that of the first embodiment, but the light source device is different from that of the first embodiment. Therefore, in this embodiment, only the periphery of the light source device will be described with reference to FIG. 6, and the description of the liquid crystal light valve and the like will be omitted.
FIG. 6 is a cross-sectional view of a light source device provided in the projection display device.
Since the light source devices 70R, 70G, and 70B have the same configuration and are different only in solid light sources (LED chips) that emit light, the configuration of the light source device 70R will be described, and the description of the light source devices 70G and 70B will be omitted.
As shown in FIG. 6, the light source device 70R includes an LED chip (solid light source) 11r that emits R color light, a substrate 12 on which the LED chip 11r is placed, and a lens that collimates the emitted light of the LED chip 11r. 13 and a circulation pump (not shown) for circulating a cooling fluid C for cooling the LED.

As shown in FIG. 6, a flat cylindrical cooling chamber 15 (space) is formed inside the substrate 12. In the cooling chamber 15, a cooling fluid inflow channel 76 is connected to the substantially center of the lower surface of the cooling chamber 15, and the central axis of the inflow channel 76 is arranged to be substantially perpendicular to the lower surface of the cooling chamber 15. Has been. The cooling fluid outflow channel 17 is connected to the side surface of the cooling chamber 15 and is arranged so that the central axis of the outflow channel 17 is substantially parallel to the tangent at the connection point.
Inside the inflow channel 76, a torsion plate (plate, turbulent flow means) 77 formed by twisting a plate material with a center axis and a twist center is disposed. The pitch of the torsion plate 77 and the twisting method can take various values in consideration of the flow velocity and viscosity of the cooling fluid C, but the cooling fluid C flowing in the inflow passage 76 is swirled. It is preferable to select a value such that

Next, the operation of the light source devices 70R, 70G, and 70B, which is a characteristic part of the present invention, will be described.
Since the operations of the light source devices 70R, 70G, and 70B are the same, the operation of the light source device 70R will be described, and the description of the light source devices 70G and 70B will be omitted.
As shown in FIG. 6, the light source device 70R is supplied with electric power from an electrode (not shown) to the LED chip 11r, so that the LED chip 11r emits R color light and generates heat. The heat generated in the LED chip 11r is transferred to the substrate 12 and radiated to the cooling fluid C flowing in the cooling chamber 15, and the LED chip 11r is cooled.
The cooling fluid C is pumped to the inflow channel 76 by a circulation pump (not shown) and flows through the inflow channel 76. The cooling fluid C flowing through the inflow channel 76 flows along the twist plate 77 and becomes a swirl flow swirling spirally. The cooling fluid C that has turned into the swirl flows into the cooling chamber 15, collides with the upper surface of the cooling chamber 15, flows toward the side surface, and flows toward the outflow channel 17 along the side surface. A vortex is formed in the turbulent flow. Thereafter, the cooling fluid C flows out from the outflow channel 17, releases the absorbed heat in the heat radiating section (not shown), flows into the circulation pump, and is pumped again to the inflow channel 16.

  According to the above configuration, since the twisted plate 77 is disposed inside the inflow channel 76, the cooling fluid C flowing through the inflow channel 76 flows while spirally turning along the torsion plate 77. Therefore, the cooling fluid flows into the cooling chamber 15 while spirally swirling, and the flow of the cooling fluid in the cooling chamber 15 becomes a turbulent flow with more irregular and complicated fluctuations. Since the flow of the cooling fluid C in the cooling chamber 15 is a turbulent flow, the heat generated in the LED chips 11r, 11g, and 11b can be efficiently transmitted to the cooling fluid C, and the LED chips 11r, 11g, and 11b. Can be efficiently radiated to the cooling fluid C.

[Fourth Embodiment]
Next, a fourth embodiment of the present invention will be described with reference to FIGS.
The basic configuration of the projection display device according to the present embodiment is the same as that of the first embodiment, but the light source device is different from that of the first embodiment. Therefore, in this embodiment, only the periphery of the light source device will be described with reference to FIGS.
FIG. 7 is a cross-sectional view of a light source device provided in the projection display device. FIG. 8 is a bottom view of the light source device.
Since the light source devices 80R, 80G, and 80B have the same configuration and are different only in solid light sources (LED chips) that emit light, the configuration of the light source device 80R will be described, and the description of the light source devices 80G and 80B will be omitted.
As shown in FIG. 7, the light source device 80R includes an LED chip (solid light source) 11r that emits R color light, a substrate 12 on which the LED chip 11r is mounted, and a lens that collimates the emitted light of the LED chip 11r. 13 and a circulation pump (not shown) for circulating a cooling fluid C for cooling the LED.

As shown in FIGS. 7 and 8, a flat cylindrical cooling chamber 15 (space) is formed inside the substrate 12. In the cooling chamber 15, a cooling fluid inflow channel 86 is connected to the substantially center of the lower surface of the cooling chamber 15, and the central axis of the inflow channel 86 is arranged to be substantially perpendicular to the lower surface of the cooling chamber 15. Has been. The cooling fluid outflow channel 17 is connected to the side surface of the cooling chamber 15 and is arranged so that the central axis of the outflow channel 17 is substantially parallel to the tangent at the connection point.
Four plate-like fins (turbulent means) 87 are arranged on the inner peripheral surface of the inflow channel 86 so as to have a twist angle with respect to the central axis of the inflow channel 86. Note that the number of fins 87 arranged, the twist angle, and the like can take various values in consideration of the flow rate and viscosity of the cooling fluid C, but the cooling fluid C flowing in the inflow passage 86 swirls. It is preferable to select a value such that

Next, the operation of the light source devices 80R, 80G, and 80B, which is a feature of the present invention, will be described.
Since the operations of the light source devices 80R, 80G, and 80B are the same, the operation of the light source device 80R will be described, and the description of the light source devices 80G and 80B will be omitted.
As shown in FIG. 7, the light source device 80R is supplied with electric power from an electrode (not shown) to the LED chip 11r, so that the LED chip 11r emits R color light and generates heat. The heat generated in the LED chip 11r is transferred to the substrate 12 and radiated to the cooling fluid C flowing in the cooling chamber 15, and the LED chip 11r is cooled.
The cooling fluid C is pumped to the inflow channel 86 by a circulation pump (not shown) and flows in the inflow channel 86. The cooling fluid C flowing through the inflow channel 76 flows along the fins 87 and becomes a swirl flow that swirls spirally. The cooling fluid C that has turned into the swirl flows into the cooling chamber 15, collides with the upper surface of the cooling chamber 15, flows toward the side surface, and flows toward the outflow channel 17 along the side surface. A vortex is formed in the turbulent flow. Thereafter, the cooling fluid C flows out from the outflow channel 17, releases the absorbed heat in the heat radiating section (not shown), flows into the circulation pump, and is pumped again to the inflow channel 16.

According to the above configuration, since the fins 87 are arranged on the inner peripheral surface of the inflow channel 86, the cooling fluid C flowing through the inflow channel 86 flows while swirling along the fins 87.
Therefore, the cooling fluid C flows into the cooling chamber 15 while spirally turning, and the flow of the cooling fluid C in the cooling chamber 15 becomes a turbulent flow with more irregular and complicated fluctuations. Since the flow of the cooling fluid C in the cooling chamber 15 is a turbulent flow, the heat generated in the LED chips 11r, 11g, and 11b can be efficiently transmitted to the cooling fluid. In the LED chips 11r, 11g, and 11b, The generated heat can be efficiently radiated to the cooling fluid C.

[Fifth Embodiment]
Next, a fifth embodiment of the present invention will be described with reference to FIGS.
The basic configuration of the projection display device according to the present embodiment is the same as that of the first embodiment, but the light source device is different from that of the first embodiment. Therefore, in this embodiment, only the periphery of the light source device will be described with reference to FIGS.
FIG. 9 is a cross-sectional view of a light source device provided in the projection display device. FIG. 10 is a bottom view of the light source device.
Since the light source devices 90R, 90G, and 90B have the same configuration and are different only in solid light sources (LED chips) that emit light, the configuration of the light source device 90R will be described, and the description of the light source devices 90G and 90B will be omitted.
As shown in FIG. 9, the light source device 90R includes an LED chip (solid light source) 11r that emits R color light, a substrate 12 on which the LED chip 11r is placed, and a lens that collimates the emitted light of the LED chip 11r. 13 and a circulation pump (not shown) for circulating a cooling fluid C for cooling the LED.
As shown in FIGS. 9 and 10, a flat cylindrical cooling chamber 15 (space) is formed inside the substrate 12. In the cooling chamber 15, a cooling fluid inflow channel 96 is connected in the vicinity of the side surface of the lower surface of the cooling chamber 15, and the central axis of the inflow channel 96 is disposed at an inclination angle with respect to the lower surface of the cooling chamber 15. Has been. The outflow channel 17 for the cooling fluid C is connected to the side surface of the cooling chamber 15 and is arranged so that the central axis of the outflow channel 17 is substantially parallel to the tangent at the connection point. Note that the connection position of the inflow channel 96 and the inclination angle with respect to the lower surface of the cooling chamber 15 can be changed in various ways in consideration of the flow velocity, viscosity, etc. of the cooling fluid C. It is preferable to select so as to turn in the flow.

Next, the operation of the light source devices 90R, 90G, and 90B, which is a feature of the present invention, will be described.
Since the light source devices 90R, 90G, and 90B have the same operation, the operation of the light source device 90R will be described, and the description of the light source devices 90G and 90B will be omitted.
As shown in FIG. 7, the light source device 80R is supplied with electric power from an electrode (not shown) to the LED chip 11r, so that the LED chip 11r emits R color light and generates heat. The heat generated in the LED chip 11r is transferred to the substrate 12 and radiated to the cooling fluid C flowing in the cooling chamber 15, and the LED chip 11r is cooled.
The cooling fluid C is pumped to the inflow channel 96 by a circulation pump (not shown), flows through the inflow channel 96, and flows into the cooling chamber 15. The cooling fluid C flowing into the cooling chamber 15 collides with the upper surface of the cooling chamber 15 and swirls along the side surface to form a vortex in the cooling chamber 15 to become a turbulent flow. Thereafter, the cooling fluid C flows out from the outflow channel 17, releases the absorbed heat in the heat radiating section (not shown), flows into the circulation pump, and is pumped again to the inflow channel 16.

  According to the above configuration, since the cooling fluid C in the cooling chamber 15 is turbulent, a laminar boundary layer is not formed in the vicinity of the wall surface of the cooling chamber 15 and is generated in the LED chips 11r, 11g, and 11b. Heat can be efficiently transferred to the cooling fluid. In addition, since the fluid particles flow irregularly in the turbulent flow, the heat transmitted from the LED chips 11r, 11g, and 11b is quickly transported to the cooling fluid that is not in contact with the wall surface of the cooling chamber 15. Therefore, the temperature of the cooling fluid in contact with the wall surface of the cooling chamber 15 is unlikely to rise, and the heat generated in the LED chips 11r, 11g, and 11b can be efficiently transmitted to the cooling fluid.

The technical scope of the present invention is not limited to the above embodiment, and various modifications can be made without departing from the spirit of the present invention.
For example, in the above-described embodiment, the light source device has been described to be adapted to the configuration including one LED chip. However, the configuration is not limited to the configuration including the one LED chip, and a plurality of LED chips are included. It can be adapted to other configurations.
In the above-described embodiment, the description has been made in conformity with the configuration using the transmissive liquid crystal panel as the light modulation means. However, the present invention is not limited to the configuration using the transmissive liquid crystal panel. In addition, other light modulation means such as a digital micromirror device (DMD, registered trademark) can be used.

It is the schematic of the whole structure of the projection type display apparatus concerning 1st Embodiment. It is sectional drawing which shows the structure of the light source device concerning this Embodiment. It is a bottom view which shows the structure of the light source device concerning this Embodiment. It is sectional drawing which shows the structure of the light source device concerning 2nd Embodiment. It is a bottom view which shows the structure of the light source device concerning this Embodiment. It is sectional drawing which shows the structure of the light source device concerning 3rd Embodiment. It is sectional drawing which shows the structure of the light source device concerning 4th Embodiment. It is a bottom view which shows the structure of the light source device concerning this Embodiment. It is sectional drawing which shows the structure of the light source device concerning 5th Embodiment. It is a bottom view which shows the structure of the light source device concerning this Embodiment.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Projection type display apparatus, 10R, 10G, 10B, 60R, 70R, 80R, 90R, ... Light source device, 11r ... LED chip (solid light source), 15 ... Cooling chamber (space), 16, 66, 76, 86, 96 ... Inflow passage, 17 ... Outflow passage, 20R, 20G, 20B ... Liquid crystal light valve (light modulation means), 40 ... Projection lens (projection means) ), 67... Spiral groove (recess, turbulent means), 77. Twisted plate (plate, turbulent means), 87. Fin (turbulent means)

Claims (10)

A light source device comprising: a solid light source that emits light; a cooling fluid that exchanges heat with the solid light source; and a space in which the cooling fluid flows.
The space is connected with an inflow channel into which the cooling fluid flows in and an outflow channel through which the cooling fluid flows out,
The light source device, wherein the inflow channel and the outflow channel are arranged so that the central axis of the inflow channel and the central axis of the outflow channel are in a twisted positional relationship. The space is formed in a substantially cylindrical shape,
The inflow channel is connected to the center of the circle on the upper or lower surface of the cylindrical shape;
The outflow channel is connected to the cylindrical side surface, and the central axis of the outflow channel is arranged so as to be substantially parallel to a tangential direction of a circle at a connection point. Item 2. The light source device according to Item 1. A light source device comprising: a solid light source that emits light; a cooling fluid that exchanges heat with the solid light source; and a space in which the cooling fluid flows.
An inflow channel into which the cooling fluid flows is connected to the space,
The light source device according to claim 1, wherein the inflow passage is provided with turbulence generating means for changing the flow direction of the cooling fluid to turbulence.   4. The light source device according to claim 3, wherein the turbulent flow means is a concave portion formed in a spiral shape on the inner surface of the inflow channel.   4. The light source device according to claim 3, wherein the turbulence generating means is a spiral plate disposed inside the inflow channel.   4. The light source device according to claim 3, wherein the turbulent flow means is a fin that changes the flow direction of the cooling fluid disposed inside the inflow channel. A light source device comprising: a solid light source that emits light; a cooling fluid that exchanges heat with the solid light source; and a space in which the cooling fluid flows.
An inflow channel into which the cooling fluid flows is connected to the space,
The light source device, wherein the inflow channel is arranged so that a central axis of the inflow channel does not pass through the center of gravity when the space is regarded as an object. A light source device comprising: a solid light source that emits light; a cooling fluid that exchanges heat with the solid light source; and a space in which the cooling fluid flows.
The space is connected with an inflow channel into which the cooling fluid flows in and an outflow channel through which the cooling fluid flows out,
The arrangement relationship between the inflow channel and the outflow channel is the arrangement relationship according to claim 1 or 2,
A light source device comprising the turbulent flow means according to any one of claims 3 to 6 in the inflow channel. A light source device comprising: a solid light source that emits light; a cooling fluid that exchanges heat with the solid light source; and a space in which the cooling fluid flows.
The space is connected with an inflow channel into which the cooling fluid flows in and an outflow channel through which the cooling fluid flows out,
The arrangement relationship between the inflow channel and the outflow channel is the arrangement relationship according to claim 1 or 2,
The light source device according to claim 7, wherein an arrangement relationship between the inflow channel and the space is the arrangement relationship according to claim 7. A projection type display device comprising: a light source device; a light modulation unit that modulates light from the light source device; and a projection unit that projects light modulated by the light modulation unit.
A projection display device, wherein the light source device is the light source device according to claim 1.

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