JP2015001595A - Light source cooling unit, light source cooling device and projection type display device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a light source cooling unit, a light source cooling device and a projection type display device that maintain cooling performance of a light source without increase in size of a holding member holding the light source, and enhance serviceability about damage of the light source.SOLUTION: The light source cooling unit comprises: a holding member 2 that holds a light source, and has a suction part of gas and an exhaust part thereof for cooling the light source; a first mesh member 1011 that is disposed at a position of the exhaust part; and a second mesh member 103 that is disposed in a flow channel between an exhaust fan for externally exhausting the gas exhausted from the exhaust part outside a device and the first mesh member. An aperture ratio of the second mesh member is smaller than that of the first mesh member, and a total area of an aperture part of the second mesh member is equal to that of an aperture part of the first mesh member, or larger than that of the aperture part of the first mesh member.

Description

  The present invention relates to a light source cooling unit, a light source cooling device, and a projection display device such as a liquid crystal projector using the light source cooling unit that cools a light source and suppresses scattering of fragments when the light source is broken.

  In recent years, the demand for projection display devices typified by liquid crystal projectors is rapidly expanding. As a light source mounted on the projection display device, a lamp filled with gas inside a glass constituting an arc tube such as a halogen lamp, a xenon lamp, a metal halide lamp, or an ultrahigh pressure mercury lamp is used. These lamps have a very high internal pressure during operation, and if they are used beyond the product life or are used in a non-recommended installation method, they may be damaged during operation due to deterioration of the arc tube. is there.

  When the lamp is damaged, the holding member (lamp unit) that holds the light source can be replaced. Therefore, the projection display device can be used again by replacing the lamp with a new lamp unit. However, since the lamp unit cools the lamp by blowing air from the cooling fan and communicates with the outside of the projection display device through the exhaust duct, if the lamp breaks, the fragments of the lamp are inside the projection display device or inside the projection display device. There is a risk of scattering outside the projection display device.

  When debris is scattered inside the projection display device, the maintainability of the projection display device deteriorates, for example, if the debris is large, it may cause a failure. Furthermore, it is further undesirable if the fragments are scattered outside the projection display device. Therefore, a translucent plate is provided at the opening of the reflector so that no debris is scattered outside the lamp unit when the lamp is damaged, and a mesh (metal mesh) is provided at the exhaust port of the holding member (lamp unit) that holds the light source. There is known a projection-type display device provided with a (Patent Document 1).

Japanese Patent Laid-Open No. 10-254061

  In Patent Document 1, when a fine mesh is attached to the exhaust port of the light source holding member, it is possible to prevent the fragments from being scattered when the lamp is broken, but a new problem that the cooling performance is deteriorated occurs. Therefore, in order to maintain the cooling performance, it is necessary to make the mesh of the exhaust port of the holding member holding the light source a rough mesh or to increase the area of the exhaust port. However, if such a configuration is adopted, the above-described problems cannot be solved, or the holding member for holding the light source becomes large.

  An object of the present invention is to provide a light source cooling unit, a light source cooling device, and a projection display device that maintain the cooling performance of the light source without increasing the size of the holding member that holds the light source and improve the maintainability with respect to the damage of the light source. Is to provide.

  In order to achieve the above object, a light source cooling unit according to the present invention is arranged at a position of a holding member having a gas intake part and an exhaust part for holding the light source and cooling the light source, and the exhaust part. A first mesh member, and a second mesh member disposed in a flow path between the first mesh member and an exhaust fan for exhausting the gas exhausted from the exhaust section to the outside of the apparatus. The aperture ratio of the second mesh member is smaller than the aperture ratio of the first mesh member, and the total area of the openings of the second mesh member is The total area of the openings of the first mesh member is equal to or larger than the total area of the openings of the first mesh member.

  In addition, the light source cooling device according to the present invention holds the light source, holds a gas intake portion and an exhaust portion for cooling the light source, and a first mesh disposed at the position of the exhaust portion. A member, an exhaust fan for exhausting the gas exhausted from the exhaust part to the outside of the device, and a second mesh member disposed in a flow path between the first mesh member and the exhaust fan, The aperture ratio of the second mesh member is smaller than the aperture ratio of the first mesh member, and the total area of the openings of the second mesh member is The total area of the openings of the first mesh member is equal to or larger than the total area of the openings of the first mesh member.

  Further, the projection display device according to the present invention is configured to illuminate each of the image modulation elements with illumination light from a light source with the different color light for a plurality of image modulation elements each corresponding to different color light. An optical system, a second optical system for combining different color lights from the plurality of image modulation elements illuminated by the first optical system, the first optical system, and the second optical system. A projection optical system that projects light modulated by the plurality of image modulation elements onto a screen surface, and the light source cooling unit.

  ADVANTAGE OF THE INVENTION According to this invention, while maintaining the cooling performance of a light source, without enlarging the holding member holding a light source, the improvement of the maintainability regarding damage to a light source can be aimed at.

It is sectional drawing of the light source cooling device which concerns on the 1st Embodiment of this invention. It is a top view of the projection type display apparatus carrying the light source cooling device which concerns on embodiment of this invention. (A) is the optical block diagram seen from the upper direction of the projection type display apparatus carrying the light source cooling device which concerns on embodiment of this invention, (b) is the optical block diagram seen from the side. It is a cooling block diagram of the projection type display apparatus carrying the light source cooling device which concerns on the 1st Embodiment of this invention. (A), (b) is sectional drawing of the 1st mesh member and 2nd mesh member which concern on 1st Embodiment, respectively. It is sectional drawing of the light source cooling device which concerns on the 2nd Embodiment of this invention. (A), (b) is sectional drawing of the 1st mesh member and 2nd mesh member which concern on 2nd Embodiment, respectively. It is sectional drawing of the light source cooling device which concerns on the 3rd Embodiment of this invention. (A), (b) is sectional drawing of the 1st mesh member and 2nd mesh member which concern on 3rd Embodiment, respectively.

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

<< First Embodiment >>
(Projection type display device)
In FIG. 2, reference numeral 1 denotes a lamp as a light source (as a light source filled with gas inside a glass, such as a halogen lamp, a xenon lamp, a metal halide lamp, or an ultrahigh pressure mercury lamp), and 2 denotes a holding member that holds the lamp 1. It is a lamp holder. α is an illumination optical system for incident light from the lamp 1, and β is a color separation / synthesis optical system including liquid crystal panels for three colors R, G, and B for incident light from the illumination optical system α. Reference numeral 3 denotes a projection lens unit that emits light emitted from the color separation / synthesis optical system β and projects an image on a screen (projected surface) (not shown).

  Reference numeral 4 denotes an optical box that houses the lamp holder 2, the illumination optical system α, and the color separation / synthesis optical system β and that fixes the projection lens unit 3. Reference numeral 5 denotes a ballast unit, and the ballast unit 5 includes a ballast power source for controlling the lighting of the lamp 1. A power source 6 is incorporated in the exterior cabinet 13 and is electrically connected to the ballast unit 5 to supply electricity to the housing.

  7a is a blower fan (optical cooling) as a cooling fan that sucks outside air from the air inlet 17 provided in the exterior cabinet 13 and cools the reflective liquid crystal display element 48G for G shown in FIG. 3 of the color separation / synthesis optical system β. Fan). 7b is a blower fan as a cooling fan that sucks outside air from the intake port 17 and cools the R reflective liquid crystal display element 48R and the B reflective liquid crystal display element 48R shown in FIG. (Optical cooling fan). Reference numeral 8 denotes an RGB duct for smoothly sending outside air flowing in from the air inlet 17 by the optical cooling fans 7a and 7b to the color separation / synthesis system β.

  Reference numeral 9 denotes a blower fan (lamp cooling fan) as a cooling fan for sending air to the lamp 1 for cooling. Reference numeral 10 denotes a lamp cooling fan 9 which fixes the cooling air from the lamp cooling fan 9 to the lamp 1. It is a lamp cooling duct for sending. Reference numeral 11 denotes an exhaust fan (electric exhaust fan) as a cooling fan that exhausts the air exhausted from the optical cooling duct 15 to the outside of the housing and exhausts the air around the RGB substrate 18. Reference numeral 12 denotes an exhaust fan (lamp exhaust fan) serving as a cooling fan that exhausts air that has been blown from the lamp cooling fan 9 and has reached a high temperature from the exhaust lid 16.

  Reference numeral 13 denotes an exterior cabinet for storing the optical box 4 and the like. Reference numeral 14 denotes a blower fan (optical cooling fan) as a cooling fan that cools the polarization conversion element by blowing air in the housing onto the polarization conversion element described later. Reference numeral 15 denotes an optical cooling duct for fixing the optical cooling fan 14 and sending cooling air to the polarization conversion element. Reference numeral 16 denotes an exhaust lid having an exhaust port for exhausting air inside the housing, and is configured to be openable and closable from the exterior cabinet 13. Reference numeral 17 denotes an intake port including an air filter (not shown) that suppresses dust from entering the housing when the outside air is inhaled. Reference numeral 18 denotes an RGB substrate for controlling the color separation / synthesis optical system.

(Optical configuration of the projection display device)
Next, a projection type equipped with a reflection type liquid crystal display element (an image forming element such as a reflection type liquid crystal panel) constituted by the lamp 1, the illumination optical system α, the color separation / synthesis optical system β, and the projection lens unit 3 described above. The optical configuration of the display device will be described with reference to FIG. FIG. 3A is an optical configuration diagram viewed from above of a projection display device equipped with the light source cooling device according to the present embodiment, and FIG. 3B is an optical configuration diagram viewed from the side.

  Conceptually, the projection display device according to the present embodiment is configured such that each of the image modulation elements is irradiated with light from a light source with a different color light with respect to a reflective liquid crystal display element as a plurality of image modulation elements corresponding to different color lights. The first optical system (illumination optical system α, color separation optical system) that illuminates with is provided. Also, a second optical system (color combining optical system) that combines different color lights from the plurality of image modulation elements illuminated by the first optical system, and the first optical system and the second optical system. A projection optical system that projects light modulated by a plurality of image modulation elements onto a screen surface.

1) Illumination optical system α
In FIG. 3, 31 is a lamp bulb that emits white light in a continuous spectrum, and 32 is a reflector that collects light from the lamp bulb 31 in a predetermined direction, and the lamp 1 is formed by the lamp bulb 31 and the reflector 32. Reference numeral 33a denotes a fly-eye lens A, and 33b denotes a fly-eye lens B, which is a light beam splitting unit that splits light from the lamp 1 into a plurality of light beams.

  An ultraviolet absorption filter 34 is a color selective filter for removing light (ultraviolet rays) on the short wavelength side from the light from the lamp 1. A polarization conversion element 35 converts non-directional light (unpolarized light) from the lamp 1 into predetermined polarized light. Reference numeral 36 denotes a reflection mirror for bending the optical axis (optical path). 37a is a condenser lens A, 37b is a condenser lens B, and is a condensing means for illuminating a plurality of light beams divided by the fly-eye lens A33a and the fly-eye lens B33b on the reflective display element. The illumination optical system α is configured as described above.

2) Color separation / synthesis optical system β
In FIG. 3, 38 is a dichroic mirror that reflects light in the blue (B) and red (R) wavelength regions and transmits light in the green (G) wavelength region, and 39 is for increasing the color purity of R. The trimming filter limits the wavelength range used by the R band light. Reference numeral 40 denotes a wire grid polarizing plate which is a reflection type polarization selection means, and 41 denotes a color select which is a wavelength selective phase plate for converting the polarization direction of light in a predetermined wavelength range.

  Reference numeral 42 denotes a first polarization beam splitter having a polarization separation surface, and 43 denotes a second polarization beam splitter having a polarization separation surface. Reference numeral 44 denotes a combining prism that operates in the same manner as the dichroic mirror 38 for blue (B) and green (G), and operates in the same manner as the polarization beam splitter 42 for red (R). 45 is a blue polarizing plate as a blue (B) polarization selection means, and 46 is a green polarizing plate as a green (G) polarization selection means.

  47R, 47G, and 47B are an R quarter-wave plate, a G quarter-wave plate, and a B quarter-wave plate, respectively. Reference numerals 48R, 48G, and 48B denote an R reflective liquid crystal display element, a G reflective liquid crystal display element, and a B reflective liquid crystal display element that reflect incident light and modulate the image, respectively. The color separation / synthesis optical system β is configured as described above.

(Cooling configuration of projection display)
Next, the cooling structure in the projection display device will be described with reference to FIG. As described above, the projection display device includes four blower fans as cooling fans and two exhaust fans as cooling fans. A flow path constituted by a total of six cooling fans is indicated by arrows in FIG. 4, with solid arrows indicating intake air and broken arrows indicating exhaust.

1) Cooling of optical element including liquid crystal display element Regarding the cooling of the optical element including the liquid crystal display element, the outside air flows from the intake port 17 by the rotation of the optical cooling fan 7a and the optical cooling fan 7b. The air that has flowed out of the optical cooling fan 7a cools the G reflective liquid crystal display element 48G of the color separation / synthesis optical system β shown in FIG. The air flowing out of the optical cooling fan 7b cools the R reflective liquid crystal display element 48R and the B reflective liquid crystal display element 48B of the color separation / synthesis optical system β shown in FIG.

  In FIG. 4, the air that has cooled each reflective liquid crystal display element is sucked into the optical cooling fan 14. The air flowing out of the optical cooling fan 14 cools the polarization conversion element 35 shown in FIG. The air that has cooled the polarization conversion element 35 is exhausted outside the casing by the electric exhaust fan 11.

2) Cooling of RGB board The electric exhaust fan 11 also plays a role of cooling the heat generated from the RGB board 18 by intake air and exhausting it outside the housing.

3) Light source cooling (light source cooling device and light source cooling unit)
Next, the cooling configuration (light source cooling device and light source cooling unit) of the lamp bulb 31 as a light source will be described with reference to FIGS. Here, the light source cooling unit is obtained by removing the cooling fan from the light source cooling device. By driving the lamp cooling fan 9 that is a blower fan and the lamp exhaust fan 12 that is a cooling fan shown in FIG.

  The air that has flowed out of the lamp cooling fan 9 on the upstream side of the first mesh member 1011 passes through the lamp cooling duct 10 shown in FIG. 1 and the metal first mesh member 1011 serving as an intake portion, and then the lamp bulb 31. Cool down. And it passes the 1st mesh member 1012 as an exhaust part. Here, the intake section and the exhaust section are an intake section to a space constituted by using a lamp holder (light source holding member) and an exhaust section from the space.

Further, the gas (for example, air) that has cooled the lamp as described above is exhausted from the first mesh member 1012 arranged at the position of the exhaust portion to the space A outside the lamp holder 2, and the second metal plate The air is exhausted from the space through the mesh member 103. That is, the first mesh member 1012 (one place), the space A, and the second mesh member 103 (one place) arranged in the flow path between the first mesh member and the exhaust fan pass in this order. The exhaust fan 12 exhausts the gas for cooling the light source from the exhaust lid 16 to the outside of the apparatus.

  The lamp exhaust fan 12 also plays a role of exhausting heat generated from the ballast unit 5 and the power source 6 to the outside of the casing. Each cooling fan and exhaust fan has a function of driving for a certain period of time after the lamp is extinguished, and reducing the temperature of the lamp and discharging the air in the housing.

(Explosion-proof performance)
Next, the explosion-proof performance in this embodiment is demonstrated using FIG. In the present embodiment, by providing the first mesh members 1011 and 1012, when the lamp bulb 31 is damaged, it is possible to prevent a large piece from being scattered outside the lamp holder 2 and causing the projection display device to fail. . The fragments smaller than the meshes of the first mesh members 1011 and 1012 and the fragments that broke through the first mesh members 1011 and 1012 bounce off the exhaust ducts 1021 and 1022 that are the duct members, and the second mesh member. 103 is reached.

Here, the opening ratios of the first mesh member 1012 serving as the exhaust portion of the lamp holder 2 and the air inlet of the space A and the second mesh member 103 serving as the exhaust port of the space A are defined as P _{1012 and} P ₁₀₃ , respectively. At this time, as shown in Expression (1), the mesh of the second mesh member 103 is made finer than that of the first mesh member 1012. Therefore, it is possible to prevent or suppress the fragments from being scattered outside the lamp holder 2 by capturing the fragments that could not be removed by the first mesh member 1012 with the second mesh member 103.

  Further, the space A provided with the exhaust port is closed by the first mesh member 1012, the exhaust ducts 1021, 1022 which are wall members, and the second mesh member 103, so that the second mesh member 103 cannot pass through. There is no risk of debris scattering outside. Here, the material of the mesh member and the wall member may be any member as long as a certain level of strength can be ensured. Here, the material of the mesh member is metal as described above, and the material of the wall member is polycarbonate.

(Cooling performance)
Next, the cooling performance of this embodiment is demonstrated using FIG. As shown in FIG. 5A, the occupied area and the aperture ratio of the first mesh member 1012 are defined as an occupied area S ₁₀₁₂ and an aperture ratio P ₁₀₁₂ , respectively. Further, as shown in FIG. 5 (b), the area occupied by S ₁₀₃ the occupied area and the opening ratio of the second mesh member _103, and the aperture ratio P _103. At this time, the expressions (1) and (2) are satisfied. Thereby, since the amount of air passing through the second mesh member 103 is equal to or larger than the amount of air passing through the first mesh member 1012, the cooling performance is not deteriorated by installing the second mesh member. .

  In other words, the expression (2) indicates that the second mesh member closer to the exhaust fan (arranged downstream) can pass the cooling air (air), that is, the total area of the opening (mesh member). The sum of the areas of the apertures) can be increased. More preferably, the total area of the openings of the downstream mesh member (second mesh member) is 1.2 times or more the total area of the openings of the upstream mesh member (first mesh member) (more Preferably, it is 1.5 times or more.

  Here, the space A in which the second mesh member 103 is installed, that is, the space around the exhaust ducts 1021 and 1022 as wall members has a sufficient space, and the degree of freedom in design is high. Therefore, the occupied area of the second mesh member 103 can be larger than the occupied area of the first mesh member 1012. Therefore, in this embodiment, there is an advantage that it is not necessary to increase the size of the lamp holder 2 that is limited in size or to increase the size of the projection display device.

... (1)

... (2)

<< Second Embodiment >>
Hereinafter, a second embodiment of the present invention will be described. In this embodiment, the point which provided the exhaust port in the space A in two places as two or more places differs from 1st Embodiment. Since the configuration other than the cooling configuration of the lamp bulb 31 is the same as that of the first embodiment, it is omitted.

  The cooling configuration of the lamp bulb 31 according to the present embodiment will be described with reference to FIGS. By driving the lamp cooling fan 9 and the lamp exhaust fan 12 shown in FIG. The air that has flowed out of the lamp cooling fan 9 passes through the lamp cooling duct 10 shown in FIG. 6 and the first mesh member 1011 made of metal as an intake portion, and then cools the lamp bulb 31.

  Then, the exhaust gas passes through the first mesh member 1012, the space A, and the metal second mesh members 1031 and 1032 provided in one place as an exhaust portion, and is exhausted from the exhaust lid 16 to the outside of the housing by the exhaust fan 12. . The intake and exhaust of the lamp exhaust fan 12 also plays a role of exhausting heat generated from the ballast unit 5 and the power source 6 to the outside of the housing. Each cooling fan and exhaust fan has a function of driving for a certain period of time after the lamp is extinguished, and reducing the temperature of the lamp and discharging the air in the housing.

(Explosion-proof performance)
Next, the explosion-proof performance of this embodiment is demonstrated using FIG. In the present embodiment, by providing the first mesh members 1011 and 1012, when the lamp bulb 31 is damaged, it is possible to prevent large pieces from being scattered outside the lamp holder 2 and causing the projection display device to fail. The fragments smaller than the meshes of the first mesh members 1011 and 1012 and the fragments that broke through the first mesh members 1012 are bounced back by the exhaust ducts 1021, 1022, and 1023 serving as wall members, and the second meshes. The members 1031 and 1032 are reached.

Here, if the opening ratios of the first mesh member 1012 and the second mesh members _{1031 and 1032} are P _1012, P _{1031 and} P ₁₀₃₂ respectively, the second mesh as shown in the equations (3) and (4) The eyes of the members 1031 and 1032 are finer than those of the first mesh member 1012. Therefore, it is possible to prevent or suppress the fragments from being scattered outside the lamp holder 2 by capturing the fragments that could not be removed by the first mesh member 1012 with the second mesh members 1031 and 1032.

  The space A is closed by a first mesh member 1012, exhaust ducts 1021, 1022, 1023 as wall members, and second mesh members 1031 and 1032. For this reason, there is no possibility that the fragments are scattered outside without passing through the second mesh members 1031 and 1032.

(Cooling performance)
Next, the cooling performance of this embodiment is demonstrated using FIG. As shown in FIG. 7A, the occupied area and the aperture ratio of the first mesh member 1012 are defined as an occupied area S ₁₀₁₂ and an aperture ratio P ₁₀₁₂ , respectively. As shown in FIG. 7B, the occupied area and the aperture ratio of the second mesh members _{1031 and 1032} are respectively an occupied area S _{1031, an} aperture ratio P _{1031, an} occupied area S _{1032, and an} aperture ratio P ₁₀₃₂ . At this time, Expression (5) is satisfied. In addition, although it is desirable that both of the expressions (3) and (4) are satisfied, there is no particular problem as long as any one of them is satisfied.

  That is, is the sum of the product of the aperture ratio and the occupied area of the second mesh member (the sum of the areas of the openings) equal to the product of the aperture ratio and the occupied area of the first mesh member (the total area of the openings)? Bigger than that.

  As a result, the combined amount of air passing through the second mesh members 1031 and 1032 is equal to or greater than the amount of air passing through the first mesh member 1012, so cooling is achieved by installing the second mesh member. Performance does not deteriorate.

  In other words, the expression (5) indicates that the second mesh member closer to the exhaust fan (arranged downstream) can pass the cooling air (air), that is, the total area of the opening (mesh member). The sum of the areas of the apertures) can be increased. More preferably, the total area of the openings of the downstream mesh member (second mesh member) is 1.2 times or more the total area of the openings of the upstream mesh member (first mesh member) (more Preferably, it is 1.5 times or more.

  Here, the space A in which the second mesh members 1031 and 1032 are installed, that is, the space around the exhaust ducts 1021, 1022, and 1023 as wall members has a sufficient space, and the degree of freedom in design is high. Therefore, the total occupied area of the second mesh members 1031 and 1032 can be larger than the occupied area of the first mesh member 1012. Therefore, in this embodiment, there is an advantage that it is not necessary to increase the size of the lamp holder 2 that is limited in size or to increase the size of the projection display device.

... (3)

···(Four)

···(Five)

<< Third Embodiment >>
Hereinafter, a third embodiment of the present invention will be described. The present embodiment is different from the first embodiment in that two intake ports in the space A are provided at a plurality of locations and two exhaust ports are provided at a plurality of locations. Since the configuration other than the cooling configuration of the lamp bulb 31 is the same as that of the first embodiment, it is omitted.

  The cooling configuration of the lamp bulb 31 will be described with reference to FIGS. By driving the lamp cooling fan 9 and the lamp exhaust fan 12 shown in FIG. The air flowing out from the lamp cooling fan 9 passes through the lamp cooling duct 10 shown in FIG. 8 and the first mesh member 1011 made of metal as the intake portion, and then cools the lamp bulb 31.

  Then, the first mesh members 1012, 1013 as the exhaust part, the space A, and the metal second mesh members 1031, 1032, 1033 pass in this order, and are exhausted from the exhaust lid 16 to the outside of the housing by the exhaust fan 12. The The intake and exhaust of the lamp exhaust fan 12 also plays a role of exhausting heat generated from the ballast unit 5 and the power source 6 to the outside of the housing. Each cooling fan and exhaust fan has a function of driving for a certain period of time after the lamp is extinguished, and reducing the temperature of the lamp and discharging the air in the housing.

(Explosion-proof performance)
Next, the explosion-proof performance of this embodiment is demonstrated using FIG. In the present embodiment, by providing the first mesh members 1011, 1012, and 1013, when the lamp bulb 31 is damaged, it is possible to prevent large pieces from being scattered outside the lamp holder 2 and causing the projection display device to fail. Or deter. The fragments smaller than the meshes of the first mesh members 1012, 1013 and the fragments that have broken through the first mesh members 1012, 1013 rebound by the exhaust ducts 1021, 1022, 1023, 1024 as wall members. Then, the second mesh members 1031, 1032, 1033 are reached.

Here, the first mesh member 1012 and 1013, P ₁₀₁₂ and the aperture ratio of the second mesh member 1031,1032,1033 _{respectively, P 1013, P 1031, P} 1032, P 1033. Here, as shown in the equations (6) and (7), the meshes of the second mesh members 1031, 1032, and 1033 are finer than those of the first mesh members 1012 and 1013. Therefore, it is possible to prevent or suppress the scattering of the fragments outside the lamp holder 2 by capturing the fragments that could not be removed by the first mesh members 1012, 1013 with the second mesh members 1031, 1032, 1033. .

  The space A is closed by first mesh members 1012, 1013, exhaust ducts 1021, 1022, 1023, 1024 as wall members, and second mesh members 1031, 1032, 1033. For this reason, there is no possibility that the fragments are scattered outside without passing through the second mesh members 1031, 1032, 1033.

(Cooling performance)
Next, the cooling performance of this embodiment is demonstrated using FIG. As shown in FIG. 9A, the first mesh members 1012, 1013 have an area _S1012 , an aperture ratio _{P1012, an} area _S1013 , and an aperture ratio _P1013 , respectively. The second mesh member 1031,1032,1033, the area S ₁₀₃₁ as shown in FIG. 9 _(b), the aperture ratio P _1031, the area S _1032, the opening ratio P _1032, the area S _1033, an aperture ratio P _1033.

  At this time, Expression (8) is satisfied. In addition, although it is desirable that both of the expressions (6) and (7) are satisfied, there is no particular problem as long as any one of them is satisfied. Further, in formula (6), the second mesh members 1031, 1032, 1033 all indicate that the aperture ratio is smaller than that of the first mesh member 1012, but either one or two satisfies this condition. May be. Similarly, in Expression (7), the second mesh members 1031, 1032, and 1033 all indicate that the aperture ratio is smaller than that of the first mesh member 1013, but either one or two satisfies this condition. There may be.

  In Expression (8), the sum of the product of the aperture ratio and the occupied area of the second mesh member (the sum of the areas of the openings) is the sum of the product of the aperture ratio of the first mesh member and the occupied area (of the aperture). It is equal to or greater than the total area). Accordingly, the combined amount of air passing through the second mesh members 1031, 1032, 1033 is equal to or greater than the amount of air passing through the first mesh members 1012, 1013. For this reason, the cooling performance is not deteriorated by installing the second mesh member.

  In other words, the expression (8) indicates that the second mesh member closer to the exhaust fan (arranged more downstream) can pass the cooling air (air), that is, the total area of the opening (mesh member). The sum of the areas of the apertures) can be increased. More preferably, the total area of the openings of the downstream mesh member (second mesh member) is 1.2 times or more the total area of the openings of the upstream mesh member (first mesh member) (more Preferably, it is 1.5 times or more.

  Here, the space A in which the second mesh members 1031, 1032, and 1033 are installed, that is, the space around the exhaust ducts 1021, 1022, 1023, and 1024 as wall members has a sufficient space and the degree of freedom in design. Is expensive. Therefore, the total occupied area of the second mesh members 1031, 1032, 1033 can be larger than the total occupied area of the first mesh members 1012, 1013. Therefore, in this embodiment, there is an advantage that it is not necessary to increase the size of the lamp holder 2 that is limited in size or to increase the size of the projection display device.

Maximum value of P ₁₀₁₂ > P _1031, P _{1032, and} P ₁₀₃₃ (6)
Maximum value of P ₁₀₁₃ > P _1031, P _1032, P ₁₀₃₃ (7)

... (8)
(Modification)
As mentioned above, although embodiment of this invention was described, this invention is not limited to this, A various deformation | transformation is possible within the range of identity.

(Modification 1)
In the above-described embodiment, the space A having the first mesh member as the air inlet is configured by a combination of the second mesh member and the exhaust duct as the wall member except for the first mesh member. However, the present invention is not limited to this, and the space A having the first mesh member as the air inlet is configured by only the second mesh member without using the exhaust duct as the wall member except for the first mesh member. You may do it.

(Modification 2)
In the above-described embodiment, the first mesh member 1011 as the intake portion and the first mesh member 1012 as the exhaust portion are the mesh members having the same aperture ratio, but may be different. Specifically, as the air intake portion, any opening ratio different from that of the first mesh member 1012 and larger than the opening ratio of the second mesh member 103 may be used. You may use the hole part of the member provided with the hole shape as an intake part.

(Modification 3)
Regarding the occupied area S ₁₀₃ of the second mesh member 103, the length of the second mesh member 103 in the drawing in FIG. 1 is not limited to be longer than the length of the first mesh member 1012 in the drawing. That is, even when the length of the second mesh member 103 in the drawing in FIG. 1 is equal to or shorter than the length of the first mesh member 1012 in the drawing, the second mesh member 103 in the direction perpendicular to the drawing. It can be configured by increasing the length. In short, on the premise that the expression (1) is satisfied, the size relationship of the total area of the openings in the space A may satisfy the expression (2).

  In addition, regarding the space A, an upper plate and a lower plate are provided in the direction perpendicular to the paper surface to form a closed three-dimensional space. However, the cross-sectional shape in the direction perpendicular to the paper surface may be maintained in the shape of the paper or may be changed sequentially You may make it let it.

2 .. Lamp holder (holding member), 103... 2nd mesh member, 1011... 1st mesh member (intake part), 1012... 1st mesh member (exhaust part), 1021, 1022.
Exhaust duct (wall member)

Claims (13)

While holding the light source, a holding member having a gas intake portion and an exhaust portion for cooling the light source,
A first mesh member disposed at the position of the exhaust part;
A second mesh member disposed in a flow path between the exhaust fan for exhausting the gas exhausted from the exhaust unit to the outside of the apparatus and the first mesh member;
A light source cooling unit comprising:
The aperture ratio of the second mesh member is smaller than the aperture ratio of the first mesh member, and
The total area of the openings of the second mesh member is equal to the total area of the openings of the first mesh member or larger than the total area of the openings of the first mesh member. Cooling unit.   The light source cooling unit according to claim 1, further comprising a blower fan upstream of the intake portion.   The light source according to claim 1, further comprising an exhaust duct as a wall member that forms a space downstream of the first mesh member together with the first mesh member and the second mesh member. Cooling unit.   4. The light source cooling unit according to claim 1, wherein the first mesh member is provided at one place and the second mesh member is provided at a plurality of places. 5.   The light source cooling unit according to any one of claims 1 to 3, wherein the first mesh member is provided at a plurality of locations, and the second mesh member is provided at a plurality of locations.   The light source cooling unit according to any one of claims 1 to 3, wherein the first mesh member is provided at one place and the second mesh member is provided at one place.   The light source cooling unit according to any one of claims 1 to 6, wherein the first mesh member and the second mesh member are made of metal.   The light source cooling unit according to any one of claims 1 to 7, wherein the light source is a light source filled with gas.   The light source cooling unit according to claim 8, wherein the light source is a light source in which a glass is filled with a gas.   The light source cooling unit according to any one of claims 1 to 7, wherein the light source is any one of a halogen lamp, a xenon lamp, a metal halide lamp, and an ultrahigh pressure mercury lamp.   The light source cooling unit according to claim 3, wherein a material of the wall member is polycarbonate. While holding the light source, a holding member having a gas intake portion and an exhaust portion for cooling the light source,
A first mesh member disposed at the position of the exhaust part;
An exhaust fan for exhausting the gas exhausted from the exhaust unit to the outside of the device;
A second mesh member disposed in a flow path between the first mesh member and the exhaust fan;
A light source cooling device comprising:
The aperture ratio of the second mesh member is smaller than the aperture ratio of the first mesh member, and
The total area of the openings of the second mesh member is equal to the total area of the openings of the first mesh member or larger than the total area of the openings of the first mesh member. Cooling system. For a plurality of image modulation elements each corresponding to a different color light,
A first optical system that illuminates each of the image modulation elements with illumination light from a light source with the different color light;
A second optical system for synthesizing different color lights from the plurality of image modulation elements illuminated by the first optical system;
A projection optical system that projects the light modulated by the plurality of image modulation elements via the first optical system and the second optical system onto a screen surface;
The light source cooling unit according to any one of claims 1 to 11,
A projection type display device comprising: