JP6218387B2 - Projection display - Google Patents

Description

  The present invention relates to a projection display device including a radiator that cools a heat generating portion.

  2. Description of the Related Art Conventionally, there is known a projection display device that cools an optical element such as a light source by guiding a wind sent from a fan through a duct. To lower the temperature, it is conceivable to increase the fan output and increase the number of fans. However, the projection display device becomes large, and noise and power consumption increase. On the other hand, a method using liquid cooling instead of air cooling is also conceivable. However, liquid cooling increases the size of the projection display device, which is expensive and may cause liquid leakage. Here, there is a method of cooling the optical element by generating a turbulent flow in the vicinity of the optical element.

  Patent Document 1 discloses a configuration in which the turbulent flow generating means is installed on the upstream side of the optical element and the entire air flowing in the vicinity of the optical element is turbulent to cool the optical element.

JP 2001-125057 A

  According to the configuration of Patent Document 1, the planar optical element can be cooled by mainly making the air flow turbulent. However, in the case of having a structure for sending air to the radiator having the concavo-convex portion along the air flow, the concave portion of the radiator is narrow and the ventilation resistance is large, so that turbulent air hardly passes. For this reason, even if the turbulent flow generating means is provided upstream of the radiator to make the air flow turbulent, the convex portion of the radiator is cooled, but the air flow in the concave portion of the radiator is deteriorated. Cooling efficiency decreases. Moreover, if the space | interval of the recessed part of a heat radiator is enlarged, the surface area of a heat sink will become small and cooling efficiency will fall.

  Therefore, the present invention provides a projection display device capable of efficiently cooling a radiator.

A projection display device according to one aspect of the present invention includes a heat generating portion, a heat dissipating means having a concavo-convex portion on a surface opposite to a mounting surface of the heat generating portion, a blower means for sending air to the heat dissipating means, An air guide means for guiding the air sent from the air blowing means to the heat radiating means; and a turbulent flow generating means provided at a position facing the heat radiating means inside the air guide means. The concavo-convex part has a concave part formed along the air guide direction of the air and a convex part formed along the air guide direction, and the turbulent flow generating means includes the concave part and the convex part. It arrange | positions so that it may extend in the direction which is located in a line.
A projection display device according to another aspect of the present invention includes a heat generating portion, a heat dissipating means having a concavo-convex portion on a surface opposite to the mounting surface of the heat generating portion, a blower means for sending air to the heat dissipating means, An air guide means for guiding the air sent from the air blowing means to the heat radiating means; and a turbulent flow generating member provided at a position facing the heat radiating means inside the air guide means, and the heat radiating means. the uneven portion has a recess formed along the air guide direction of the air, and a convex portion formed along the air guide direction, the concave portion and the convex portion of the turbulent flow generating member Is longer than the length of the turbulent flow generating member in the air guide direction .

  Other objects and features of the present invention are illustrated in the following examples.

  ADVANTAGE OF THE INVENTION According to this invention, the projection type display apparatus which can cool a radiator efficiently can be provided.

1 is an optical configuration diagram of a projection display device in Embodiment 1. FIG. 1 is a perspective view of a main part of a projection display device in Embodiment 1. FIG. 1 is a perspective view of a main part of a projection display device in Embodiment 1. FIG. 1 is a cross-sectional perspective view of a main part of a projection display device in Embodiment 1. FIG. It is explanatory drawing of the generation mechanism of the turbulent flow by the turbulent flow generation means in Example 1. FIG. 3 is a cross-sectional view (YZ plane) of the main part of the projection display apparatus in Example 1. 1 is a sectional view (XZ plane) of a main part of a projection display apparatus in Embodiment 1. FIG. It is a related figure of the position of the turbulent flow generation means in Example 1, and the fall temperature of a radiator. It is principal part sectional drawing (YZ surface) of the projection type display apparatus in Example 2. FIG. It is principal part sectional drawing (YZ surface) of the projection type display apparatus in Example 3. FIG. It is principal part sectional drawing (XZ surface) of the projection type display apparatus in Example 4. FIG. It is principal part sectional drawing (XZ surface) of the projection type display apparatus in Example 5. FIG.

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

  First, the optical system of the projection display apparatus according to the first embodiment of the present invention will be described with reference to FIG. 1A and 1B are optical configuration diagrams of a projection display apparatus 100 according to the present embodiment, in which FIG. 1A shows a top view and FIG. 1B shows a side view. The projection display device 100 is a projection display device equipped with a reflective liquid crystal display element, and includes a lamp 1, an illumination optical system α, a color separation / synthesis optical system β, and a projection lens 5.

  In FIG. 1, reference numeral 41 denotes an arc tube that emits white light in a continuous spectrum. Reference numeral 42 denotes a reflector that collects light from the arc tube 41 in a predetermined direction, and the arc tube 41 and the reflector 42 constitute the lamp 1. 3 is an explosion-proof glass (explosion-proof convex lens). Reference numeral 43a denotes a first cylinder array formed of a lens array having a refractive power in the horizontal direction (the horizontal direction in the traveling direction of light from the lamp 1 (the vertical direction on the paper surface)). Reference numeral 43b denotes a second cylinder array having lens arrays corresponding to the individual lenses of the first cylinder array 43a. 44 is an ultraviolet absorption filter. A polarization conversion element 45 aligns non-polarized light with predetermined polarized light.

  A front compressor 46 is constituted by a cylindrical lens having a refractive power in the vertical direction. Reference numeral 47 denotes a total reflection mirror that converts the optical axis by 88 degrees. Reference numeral 43c denotes a third cylinder array configured by a lens array having refractive power in the vertical direction (the vertical direction in the traveling direction of light from the lamp 1 (the vertical direction on the paper surface)). 43d is a fourth cylinder array having lens arrays corresponding to the individual lenses of the third cylinder array 43c. Reference numeral 50 denotes a color filter that returns the color in a specific wavelength range to the lamp 1 in order to adjust the color coordinates to a certain value. 48 is a condenser lens, and 49 is a rear compressor composed of a cylindrical lens having refractive power in the vertical direction. The illumination optical system α is configured as described above.

  A dichroic mirror 58 reflects light in the blue (B) and red (R) wavelength regions and transmits light in the green (G) wavelength region. Reference numeral 59 denotes an incident side polarizing plate for G in which a polarizing element is attached to a transparent substrate, and transmits only P-polarized light. Reference numeral 60 denotes a first polarization beam splitter that transmits P-polarized light and reflects S-polarized light, and has a polarization separation surface.

  61R, 61G, and 61B are red, green, and blue reflective liquid crystal display elements that reflect incident light and modulate the image, respectively. 62R, 62G, and 62B are quarter-wave plates for red, green, and blue, respectively. A trimming filter 64a returns orange light to the lamp 1 in order to increase the color purity of R, and 64b is an incident-side polarizing plate for RB in which a polarizing element is attached to a transparent substrate, and transmits only P-polarized light. Reference numeral 65 denotes a color selective phase difference plate that converts the polarization direction of the R light by 90 degrees and does not convert the polarization direction of the B light. 66 denotes a second polarization beam splitter that transmits P-polarized light and reflects S-polarized light, and has a polarization separation surface. 68B is a B output side polarizing plate (polarizing element), which rectifies only the S polarized light of B, and 68G is a G outgoing side polarizing plate (polarizing element) that transmits only the S polarized light. Reference numeral 69 denotes a dichroic prism that transmits RB light and reflects G light. The elements from the dichroic mirror 58 to the dichroic prism 69 described above constitute a color separation / synthesis optical system β (portion surrounded by a broken line in FIG. 1B).

  In FIG. 1A, reference numeral 101 denotes a reflective liquid crystal display element (optical element). The reflective liquid crystal display element 101 is a heat generating part in this embodiment. Reference numeral 102 denotes a flexible cable connected to the reflective liquid crystal display element 101. Reference numeral 103 denotes a radiator (heat radiating means, heat sink) as a heat exchanging means on which the reflective liquid crystal display element 101 is mounted. As will be described later, the radiator 103 includes a concavo-convex portion 103 c on the surface opposite to the mounting surface of the reflective liquid crystal display element 101. Reference numeral 70 denotes an RGB substrate (substrate) on which an integrated circuit is formed.

  Next, with reference to FIG. 2 and FIG. 3, the main part of the projection display apparatus 100 in the present embodiment will be described. 2 and 3 are perspective views of the main part of the projection display apparatus 100, showing the peripheral structure of the reflective liquid crystal display element 101. FIG. As shown in FIG. 2, the radiator 103 is mounted on the reflective liquid crystal display element 101. A flexible cable 102 is connected to the reflective liquid crystal display element 101.

  As shown in FIG. 3, the reflective liquid crystal display element 101 and the radiator 103 are fixed to the upper part (upper surface) of the cooling duct 104 (air guiding means). In addition, a cooling fan 105 (air blowing means) is connected to the cooling duct 104. The cooling fan 105 sends air to the radiator 103. The cooling duct 104 guides the air sent from the cooling fan 105 to the radiator 103. Although not shown in FIG. 3, turbulent flow generation means 106 (turbulent flow generation source) is provided inside the cooling duct 104. Details of the turbulent flow generation means 106 will be described later.

  The reflective liquid crystal display element 101 reflects incident light and modulates the image by performing predetermined processing on the RGB substrate 70 shown in FIG. 1 based on the video signal sent through the flexible cable 102. Do. A few percent of the light incident on the reflective liquid crystal display element 101 is not reflected by the reflective liquid crystal display element 101 but is converted into thermal energy. For this reason, heat is generated in the reflective liquid crystal display element 101. The heat generated in the reflective liquid crystal display element 101 is released to the air inside the cooling duct 104 through the radiator 103. The air inside the cooling duct 104 is discharged to the outside of the cooling duct 104 as shown by the arrows in FIG.

  Next, the turbulent flow generation means in the present embodiment will be described with reference to FIG. First, the principle of cooling by turbulent flow will be described. When the wind flows uniformly with respect to the wall surface, the flow velocity in a region sufficiently away from the wall surface coincides with the main flow. On the other hand, in the vicinity of the wall surface affected by viscosity, the flow velocity becomes zero on the wall surface, and a region (boundary layer) where a velocity gradient is generated between the wall surface and the main flow is formed. In the boundary layer, fluid particles flow in a layered manner along the wall surface, so that there is almost no heat exchange between the main flow and the boundary layer. For this reason, heat exchange between the wall surface (solid wall) and the fluid (air) can be promoted by reducing the thickness of the boundary layer. Therefore, when turbulent flow is generated, the cooling efficiency can be improved for the following three reasons. That is, first, the boundary layer in the vicinity of the wall surface is destroyed by randomly hitting the boundary layer. Secondly, the generation of swirling vortices facilitates temperature exchange with the surrounding fluid. Thirdly, the effective cooling area increases due to the swirling vortex adhering to the wall surface and flowing (Coanda effect).

  FIG. 4 is a cross-sectional perspective view of a main part of the projection display apparatus 100 and shows a peripheral structure of the reflective liquid crystal display element 101. As shown in FIG. 4, the turbulent flow generation means 106 is provided at a position facing the radiator 103 on the inner lower side (inner lower surface) of the cooling duct 104. With such a configuration, the turbulent flow generation means 106 generates turbulent flow, so that the radiator 103 (convex portion thereof) can be efficiently cooled. In some projection display devices, the upper surface and the lower surface can be reversed. When the upper surface and the lower surface of the projection display device according to the present embodiment are reversed, the cooling duct 104 shown in FIG. For this reason, the turbulent flow generation means 106 is provided at a position facing the radiator 103 on the inner upper surface of the cooling duct 104. That is, the turbulent flow generation means 106 is provided at a position facing the radiator 103 inside the cooling duct 104.

  Next, the mechanism by which turbulent flow is generated by the turbulent flow generation means 106 will be described with reference to FIG. FIG. 5 is an explanatory diagram of a turbulent flow generation mechanism by the turbulent flow generation means 106, and when the turbulent flow generation means 106 is installed in the cooling duct 104 at a position facing the radiator 103. The flow of air generated in the vicinity of is shown.

  In FIG. 5, air A is air that flows in the vicinity of the radiator 103 (the recess of the radiator 103). Air B is air that flows in the vicinity of the inlet of the cooling duct 104 (the front side of the radiator 103). Air C is a region facing the radiator 103 and is away from both the radiator 103 and the turbulent flow generating means 106 (region where the air duct of the cooling duct 104 is narrowed by the turbulent flow generating means 106). The air flowing through. Air D is air that flows behind the turbulent flow generation means 106. The air E is air (vortex) generated by the speed difference between the air A and the air C. The air F is air turbulent by the turbulent flow generation means 106.

  The speed of the air A is significantly slower than the speed of the air B due to the viscosity of the air. Since the air B flows through the region where the air passage of the cooling duct 104 is narrowed by providing the turbulent flow generation means 106, the air B becomes air C having a higher flow velocity. Here, since air has viscosity, when air having a speed difference flows next to each other, a vortex is generated so that high-speed air entrains low-speed air. As described above, the speed difference between the air A flowing through the recess of the radiator 103 and the air C flowing through a region away from the radiator 103 is large. Therefore, as shown in FIG. 5, a counterclockwise vortex (air E) is generated so that the high-speed air C entrains the low-speed air A. On the other hand, since the flow of the air D is hindered by the turbulent flow generation means 106, the speed of the air D becomes slow and vortices are hardly generated. Further, as shown in FIG. 5, the air F disturbed by the turbulent flow generation means 106 flows from the lower side to the upper side, thereby promoting the counterclockwise vortex (air E).

  By providing the turbulent flow generation means 106, the amount of vortex (air E), which is a kind of turbulent flow, increases in the vicinity of the radiator 103, and the temperature of the radiator 103 can be efficiently reduced. As another structure for increasing the wind speed, it is conceivable to impart a gradient to the cooling duct 104 or to reduce the diameter of the cooling duct 104. However, in any case, since the generated air flow is a laminar flow, the cooling effect is small compared to the provision of the turbulent flow generation means 106 capable of generating a turbulent flow.

  FIG. 6A is a cross-sectional view of the main part of the projection display device 100, and shows the periphery of the reflective liquid crystal display element 101 as viewed from the air inlet side (cooling fan 105 side). The radiator 103 of this embodiment is provided on the reflective liquid crystal display element 101 side inside the cooling duct 104. And the heat radiator 103 has the uneven part 103c in which the convex part 103a (projection part) and the recessed part 103b were formed alternately. In order to increase the heat transfer coefficient by increasing the surface area of the radiator 103, the concavo-convex portion 103a is provided so as to extend along the direction in which air flows (X direction).

  Thus, in the present embodiment, the concavo-convex portion 103c of the radiator 103 has the concave portion 103b and the convex portion 103a arranged so as to extend in the air guide direction (X direction). And the turbulent flow generation means 106 is arrange | positioned so that it may extend in the direction (Y direction) orthogonal to a wind guide direction (X direction). For this reason, the turbulent flow generation means 106 is configured such that air is in a laminar flow state in the concave portion 103 b of the radiator 103 and air is in a turbulent state in the convex portion 103 a of the radiator 103.

  As shown in FIG. 6A, the width W of the concave portion 103b of the radiator 103 (the interval between adjacent convex portions 103a) is narrow. For this reason, when it is going to flow a turbulent flow to the recessed part 103b, ventilation resistance is large and it is hard to enter air into the recessed part 103b. Here, suppose that the turbulent flow generation means 106 is provided upstream of the radiator 103 (near the inlet of the cooling duct 104) to make the air flow turbulent. In this case, the convex portion 103a of the radiator 103 is efficiently cooled by the turbulent flow. However, the air flow in the recess 103b of the radiator 103 is deteriorated, and the cooling efficiency is lowered. On the other hand, even when the interval (width W) between the recesses 103b of the radiator 103 is increased, the surface area of the radiator 103 is reduced and the cooling efficiency is lowered. For this reason, the air flowing through the protrusion 103a of the radiator 103 (the lower surface of the protrusion 103a in FIG. 6A) is in a turbulent state, and the air flowing through the recess 103b of the radiator 103 is in a laminar flow state. Preferably there is.

  When the turbulent flow is generated, it is difficult for air to enter in the direction from the convex portion 103a to the concave portion 103b of the lower radiator 103 in FIG. Therefore, in order to flow laminar air in the recess 103b of the radiator 103, the air before being turbulent by the turbulent flow generating means 106 is supplied from the upstream side of the radiator 103 (the front side of the radiator 103). Need to flow.

  FIG. 6B is a diagram schematically showing the flow of air passing through the cooling duct 104 shown in FIG. 7 is a sectional view (XZ plane) of the main part of the projection display apparatus 100, FIG. 7A shows the flow of air, and FIG. 7B shows the dimensions of each element. Hereinafter, the operation of the turbulent flow generation means 106 will be described with reference to FIGS. 6 (a) and 6 (b) and FIG. 7 (a). As shown in FIG. 7A, the turbulent flow generating means 106 is installed on the inner side from the upstream side (upstream end portion) of the radiator 103, that is, the turbulent flow generating means 106 is placed at a position facing the radiator 103. Provide. With such an arrangement, the air (air A) at the time of entering the radiator 103 is in a laminar flow state. For this reason, laminar air (air A) flows from the upstream side of the radiator 103 into the recess 103 b of the radiator 103. On the other hand, the air (air E) in which the air B is turbulent by the turbulent flow generation means 106 flows through the convex portion 103 a (FIG. 6B) of the radiator 103.

  With this configuration, the boundary layer is broken by the turbulent flow in the convex portion 103a of the radiator 103 and the cooling efficiency is improved without causing the air flow to stagnate in the concave portion 103b of the radiator 103. As described above, in this embodiment, the air in the laminar flow state and the turbulent flow state are properly used in the concave portion 103b and the convex portion 103a of the radiator 103, so that the entire radiator 103 is made of laminar or turbulent air. The cooling efficiency can be improved as compared with the case of uniform cooling.

  In the present embodiment, as shown in FIG. 7B, the total length (length in the X direction) of the radiator 103 is L. Further, let x be the position (center position) of the turbulent flow generation means 106 when the left side of FIG. 7B is the upstream side and the upstream end of the radiator 103 is the reference position. The surface (the length in the Z direction) from the reference surface to the convex portion 103a (the lower surface thereof) of the radiator 103 is defined as H, with the surface facing the radiator 103 of the cooling duct 104 as a reference surface. The height (length in the Z direction) from the reference surface to the upper surface of the turbulent flow generation means 106 is y. The length of the turbulent flow generation means 106 in the air flow direction (length in the X direction) is z.

  FIG. 8A is a relationship diagram between the position x of the turbulent flow generation means 106 and the temperature drop T of the radiator 103. In the present embodiment, the total length L of the radiator 103 is 51 mm (L = 51 mm). In FIG. 8A, for example, when the temperature of the radiator 103 decreases more than −1 degree, that is, when the temperature drop T ≦ −1, the cooling effect by the turbulent flow generation means 106 is obtained. To be judged. As shown in FIG. 8A, when T = −1 is established, the position x (center position) of the turbulent flow generation means 106 is L / 20 or 7L / 10. Therefore, in order to efficiently cool the radiator 103 in this embodiment, it is preferable to install the turbulent flow generation means 106 within the range of L / 20 ≦ x ≦ 7L / 10. Further, when T = −1.5 is established, the position x of the turbulent flow generation means 106 is L / 10 or L / 2. For this reason, in order to efficiently cool the radiator 103 in the present embodiment, it is more preferable to install the turbulent flow generation means 106 within the range of L / 10 ≦ x ≦ L / 2. Further, since the cooling efficiency of the radiator 103 is maximized when x = L / 5, it is more preferable to install the turbulent flow generation means 106 in the vicinity of x = L / 5.

  Further, when the convex portion 103a of the radiator 103 is cooled by turbulent flow, if the length from the reference surface to the convex portion of the turbulent flow generating means 106 is too short, the generated turbulent flow is sufficiently generated by the convex portion of the radiator 103. 103a is not touched. On the other hand, if this length is too long, the air passage is blocked and the air volume is reduced. Therefore, in this embodiment, it is preferable to appropriately set the relationship between the heights H and y.

  FIG. 8B is a relationship diagram between the height y of the turbulent flow generation means 106 and the temperature drop T of the radiator 103. In this embodiment, H = 4 mm. As shown in FIG. 8B, when T = −1, the height y (average height) of the turbulent flow generation means 106 is 3H / 10. On the other hand, if the height y is too close to the height H, it is difficult for the wind to flow. Therefore, it is preferable that y ≦ 7H / 8. Therefore, in order to efficiently cool the radiator 103 in this embodiment, it is preferable to set the turbulent flow generation means 106 within the range of 3H / 10 ≦ y ≦ 7H / 8. Further, when T = −1.5 is established, the height y of the turbulent flow generation means 106 is 2H / 5 or 4H / 5. For this reason, in order to efficiently cool the radiator 103 in the present embodiment, it is more preferable to set the turbulent flow generation means 106 within the range of 2H / 5 ≦ y ≦ 4H / 5. In addition, since the cooling efficiency of the radiator 103 is maximized when y = 3H / 5, it is more preferable to set the height y of the turbulent flow generation means 106 in the vicinity of y = 3H / 5.

  If the length of the turbulent flow generation means 106 in the air flow direction (X direction) is too long, the opening area of the cooling duct 104 in the installation range of the turbulent flow generation means 106 becomes small. For this reason, the cooling efficiency is lowered by increasing the ventilation resistance and reducing the air volume. Therefore, in this embodiment, it is preferable to set the length z (average length) of the turbulent flow generation means 106 in the air flow direction to L / 5 or less (0 <z ≦ L / 5). Thereby, ventilation resistance can be made small enough, generating a turbulent flow.

  The turbulent flow generation means 106 of the present embodiment is not limited to its shape and material as long as the size and installation position are within a predetermined range. Moreover, you may have a structure where a part of turbulent flow generation means 106 was divided or cut, or a structure provided with cuts or protrusions. Further, the turbulent flow generation means 106 may be any of a protrusion formed integrally with the cooling duct 104, a protrusion attached with a component such as a rib, or a protrusion processed with a part of another component such as a sheet metal. Good.

  In this embodiment, a reflective liquid crystal display element is used as a heat generating part (optical element) mounted on the radiator 103. However, the present invention is not limited to this. This embodiment can also be applied to other optical elements as heat generating portions. Moreover, you may apply to structures (element or circuit) other than an optical element as a heat generating part.

  Next, with reference to FIG. 9, a projection display apparatus according to Embodiment 2 of the present invention will be described. FIG. 9 is a cross-sectional view (YZ plane) of the main part of the projection display device 100a in this embodiment. In the projection display device 100a of the present embodiment, the radiator 1031 has projections 1031a and 1031b having different heights (length in the Z direction), and the projection 103a of the radiator 103 has a uniform height. This is different from the projection display apparatus 100 of the first embodiment having the above. Since the other configuration is the same as that of the first embodiment, description thereof is omitted.

  In this embodiment, the radiator 1031 has a concave portion 1031c and convex portions 1031a and 1031b (concave and convex portions 1031d) formed along the air flow direction (X direction). However, as in the first embodiment, the turbulent flow generation means 106 is provided on the inner side of the upstream end of the radiator 1031, that is, at a position facing the radiator 1031. For this reason, the air at the time of entering the radiator 1031 is in a laminar flow state, and laminar air flows from the upstream end of the radiator 1031 into the recess 1031c of the radiator 1031.

  On the other hand, air that has been turbulent (turbulent state) by the turbulent flow generation means 106 flows through the convex portions 1031a and 1031b (the lower surface side) of the radiator 1031. As a result, it is possible to improve the cooling efficiency by destroying the boundary layer by the turbulent flow in the convex portions 1031a and 1031b of the radiator 1031 without causing the air flow to stagnate in the concave portion 1031c of the radiator 1031. As described above, in this embodiment, the laminar flow and the turbulent air are uniformly used by the concave portion 1031c and the convex portions 1031a and 1031b of the radiator 1031 so that the entire radiator 1031 is uniformly in a laminar or turbulent state air. Compared to the case of cooling, the cooling efficiency can be improved. At this time, the height H of the radiator 1031 (the length in the Z direction when the lower inner surface of the cooling duct 104 is used as a reference) is a value obtained by integrating the heights of the protrusions 1031a and 1031b of the radiator 1031. The value is divided by the length m in the direction (Y direction) orthogonal to the air flow of the vessel 1031. Moreover, the height H may use the average value of the height of a some convex part.

  In the present embodiment, the two convex portions 1031a and 1031b having different heights are alternately arranged. However, the present invention is not limited to this. Three or more different convex portions may be arranged, and the arrangement order is not limited.

  Next, a projection display apparatus according to Embodiment 3 of the present invention will be described with reference to FIG. FIG. 10 is a cross-sectional view (YZ plane) of the main part of the projection display device 100b in the present embodiment. The projection display apparatus 100b of the present embodiment has regions 1061a and 1061b in which the height (length in the Z direction) of the turbulent flow generation means 1061 differs in the axial direction (Y direction) of the turbulent flow generation means 106. This is different from the projection display apparatus of the first embodiment in which the height of the turbulent flow generation means 106 is uniform. Since the other configuration is the same as that of the first embodiment, description thereof is omitted.

  Since air flows with viscosity, near the wall surface affected by viscosity, the flow velocity is zero on the wall surface, and a velocity gradient is generated between the wall surface and the main flow. And in order to eliminate this speed difference, air peels and becomes turbulent. The turbulent flow generation means 106 according to the first embodiment has a uniform height (length in the Z direction) as shown in FIG. On the other hand, as shown in FIG. 10, the turbulent flow generation means 1061 of this embodiment has regions 1061a and 1061b having different heights (the heights are not uniform).

  However, regardless of the height of the turbulent flow generation means 1061, by installing the turbulent flow generation means 1061 inside the cooling duct 104 so as to prevent the air flow, a velocity gradient is generated between the wall surface and the main flow. . And in order to eliminate this speed difference, air is peeled and a turbulent flow is generated. The turbulent flow generating means 1061 is installed inside the upstream end of the radiator 103, that is, the turbulent flow generating means 1061 is installed at a position facing the radiator 103. For this reason, the air at the time of entering the radiator 103 is in a laminar flow state, and the laminar air flows from the upstream end of the radiator 103 into the recess 103 b of the radiator 103.

  On the other hand, the air that has been turbulent (turbulent state) by the turbulent flow generation means 1061 flows through the convex portion 103 a (the lower surface side) of the radiator 103. As a result, the boundary layer is broken by the turbulent flow in the convex portion 103a of the radiator 103 and the cooling efficiency can be improved without causing the air flow to stagnate in the concave portion 103b of the radiator 103.

  As described above, in this embodiment, laminar air and turbulent air are selectively used in the concave portion 103b and the convex portion 103a of the radiator 103, so that the entire radiator 103 is uniformly cooled with laminar or turbulent air. Compared to the case, the cooling efficiency can be improved. At this time, the height y of the turbulent flow generation means 1061 is obtained by integrating a value obtained by integrating the heights of the regions 1061a and 1061b of the turbulent flow generation means 1061 in a direction (Y direction) orthogonal to the air flow of the turbulent flow generation means 1061. The value divided by the length n. Moreover, the height H may use the average value of the height of a some convex part. The height y is the length (average height) of the turbulent flow generation means 1061 in the Z direction when the lower inner surface of the cooling duct 104 is used as a reference.

  Next, a projection display apparatus according to Embodiment 4 of the present invention will be described with reference to FIG. FIG. 11 is a cross-sectional view (XZ plane) of a main part of the projection display apparatus 100c in the present embodiment. In the projection display apparatus 100c of the present embodiment, the turbulent flow generating means 1062 is a prism (the cross section on the XZ plane is a square), and the turbulent flow generating means 106 is a cylinder (round bar) (XZ plane). This is different from the projection display device 100 of the first embodiment. Since the other configuration is the same as that of the first embodiment, description thereof is omitted.

  Since air flows with viscosity, near the wall surface affected by viscosity, the flow velocity is zero on the wall surface, and a velocity gradient is generated between the wall surface and the main flow. And in order to eliminate this speed difference, air peels and becomes turbulent. The velocity gradient is particularly large at the corners of the prisms as compared to the cylinder. For this reason, in the case of a prism, the turbulent flow is more likely to occur than in the case of a cylinder, and the cooling effect due to the boundary layer destruction is greater.

  Next, a projection display apparatus according to Embodiment 5 of the present invention will be described with reference to FIG. FIG. 12 is a cross-sectional view (XZ plane) of the main part of the projection display device 100d in the present embodiment. In this embodiment, the radiator 1032 attached to the integrated circuit 107 on the RGB substrate 70 is cooled.

  In Examples 1 to 4, a reflective liquid crystal display element (optical element) is used as an object to be cooled, but a radiator (heat exchanging means) having uneven portions (projections) along the air flow on the surface is attached. If possible, the integrated circuit on the substrate can be cooled. As shown in FIG. 12, in this embodiment, the turbulent flow generating means 106 is installed on the rectifying plate 108 and is provided on the inner side from the upstream end of the radiator 1032, that is, at a position facing the radiator 1032. . Laminar air flows from the upstream end of the radiator 1032 to the concave portion of the radiator 1032, and air turbulent by the turbulence generating means 106 flows to the convex portion of the radiator 1032. Thereby, turbulent flow can be generated at the convex portion of the radiator 1032 without suspending the air flow at the concave portion of the radiator 1032, and air is uniformly blown with laminar or turbulent air as a whole. Compared to the above, it becomes possible to improve the cooling efficiency. The rectifying plate 108 may be a part of the proximity member as long as it can conduct air.

  According to the projection display device of each of the above embodiments, by installing the turbulent flow generating means at a position facing the radiator, laminar air flows in the concave portion of the radiator and the turbulent portion of the radiator is turbulent. Flowing air flows. For this reason, according to each Example, the projection type display apparatus which can cool a radiator efficiently can be provided.

  As mentioned above, although preferable embodiment of this invention was described, this invention is not limited to these embodiment, A various deformation | transformation and change are possible within the range of the summary.

DESCRIPTION OF SYMBOLS 101 Reflective type liquid crystal display element 103 Radiator 104 Cooling duct 105 Cooling fan 106 Turbulence generating means

Claims (12)

A heating part;
A heat dissipating means having a concavo-convex portion on the surface opposite to the mounting surface of the heat generating portion;
A blowing means for sending air to the heat dissipation means;
An air guiding means for guiding the air sent from the air blowing means to the heat radiating means;
Turbulent flow generating means provided at a position facing the heat radiating means inside the air guiding means,
The concavo-convex portion of the heat radiating means has a concave portion formed along the air guide direction of the air, and a convex portion formed along the air guide direction,
The projection display device, wherein the turbulent flow generating means is arranged to extend in a direction in which the concave portion and the convex portion are arranged .   The turbulent flow generation means is configured such that the air is in a laminar flow state in the concave portion of the heat dissipation means, and the air is in a turbulent flow state in the convex portion of the heat dissipation means. Item 4. A projection display device according to Item 1.   The projection display device according to claim 1, wherein the turbulent flow generating means is a cylindrical or prismatic protrusion.   When the total length of the heat radiating means in the air guiding direction is L, and the position of the turbulent flow generating means is x when the upstream end of the heat radiating means is a reference position, the turbulent flow generating means is L / 20 4. The projection display device according to claim 1, wherein the projection display device is installed in a range of ≦ x ≦ 7 L / 10. 5.   The projection display device according to claim 4, wherein the turbulent flow generation means is installed in a range of L / 10 ≦ x ≦ L / 2.   The height from the reference surface to the lower surface of the concavo-convex portion of the heat radiating means when the surface facing the heat radiating means of the air guide means is defined as H, and the upper surface of the turbulent flow generating means from the reference surface 6. The turbulent flow generation means is set in a range of 3H / 10 ≦ y ≦ 7H / 8, where y is the height up to The projection display device described.   The projection display device according to claim 6, wherein the turbulent flow generation means is set in a range of 2H / 5 ≦ y ≦ 4H / 5.   When the total length of the heat radiating means in the air guiding direction is L and the length of the turbulent flow generating means in the air guiding direction is z, the turbulent flow generating means is set to satisfy 0 <z ≦ L / 5. The projection display device according to claim 1, wherein the projection display device is a projection display device.   The projection display device according to claim 1, wherein the heat generating unit is an optical element.   The projection display apparatus according to claim 9, wherein the optical element is a reflective liquid crystal display element.   The projection display device according to claim 1, wherein the heat generating portion is an integrated circuit formed on a substrate. A heating part;
A heat dissipating means having a concavo-convex portion on the surface opposite to the mounting surface of the heat generating portion;
A blowing means for sending air to the heat dissipation means;
An air guiding means for guiding the air sent from the air blowing means to the heat radiating means;
A turbulent flow generating member provided at a position facing the heat dissipating means inside the air guiding means,
The concavo-convex portion of the heat radiating means has a concave portion formed along the air guide direction of the air, and a convex portion formed along the air guide direction,
The projection display device, wherein a length of the turbulent flow generating member in a direction in which the concave portion and the convex portion are aligned is longer than a length of the turbulent flow generating member in the air guide direction.