JP2009054642A - Ventilation structure, and projection video display device and electronic apparatus using the structure - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a ventilation structure capable of preventing fingers and objects from entering through the air outlet, reduction of air outlet strength, and increase of outlet air temperature, consequently increasing the ventilation efficiency, and to provide a projection video display device and an electronic apparatus using this structure. <P>SOLUTION: An inner metallic wall 16 is provided inside an outer resin wall (upper case 2a and lower case 2b) and a plurality of vent holes 7a and 17a are formed on the outer and inner walls. The vent holes 17a in the air outlet 17 formed in the inner metallic wall 16 are formed smaller according to a preset safety standard and the distance between vent holes 17a are also formed smaller to increase the open area ratio. Further, each vent hole 7a of the air outlet 7 formed on the outer resin wall is made greater than each vent hole 17a of the air outlet 17 formed on the inner wall 16. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to an exhaust structure, a projection display apparatus such as a liquid crystal projector using the exhaust structure, and an electronic apparatus.

  In addition to projection display devices such as liquid crystal projectors, various electronic devices are provided with an exhaust port for discharging and cooling the air whose temperature has been raised by internal heat generating components to the outside. In order to increase the exhaust efficiency, it is necessary to increase the opening ratio of the exhaust port as much as possible.

  When resin is used as the material of the parts that make up the exhaust port, it is conceivable to increase the size of each of the many vent holes that make up the exhaust port in order to increase the aperture ratio. There is a problem that it becomes possible to insert a coin (such as a coin) and a problem that the strength of the exhaust port is lowered. Although it is conceivable to reduce the distance between the air holes while keeping the air holes small, there is a limit in the problem of resin fluidity at the time of molding.

  On the other hand, when metal is used as the material of the parts constituting the exhaust port, the interval between the air holes can be considerably reduced, so that the aperture ratio can be increased, but when the exhaust temperature is high, the exhaust port There is a problem that the temperature of the metal constituting the metal also becomes high.

Patent Document 1 describes a case where a metal inner case is provided inside a resin outer case.
JP 2002-151875 A

  However, the above-mentioned patent document 1 does not describe the above-described problems related to the exhaust port and the countermeasures.

  Accordingly, the present invention has been made to solve such a problem, and increases exhaust efficiency without causing insertion of a finger or a foreign object from the exhaust port, a decrease in exhaust port strength, an increase in exhaust port temperature, or the like. It is an object of the present invention to provide an exhaust structure that can be used, a projection display apparatus using the exhaust structure, and an electronic apparatus.

  In order to achieve the above object, an exhaust structure according to claim 1 of the present invention is an exhaust structure in which a metal inner wall is provided inside a resin outer wall and a plurality of vent holes are formed in the outer wall and the inner wall. While forming the opening, each exhaust hole of the exhaust port formed in the metal inner wall is formed in a small size corresponding to a predetermined safety standard, and the interval between the respective vent holes is also formed small to increase the opening ratio, Each vent hole of the exhaust port formed in the resin outer wall is formed larger than each vent hole of the exhaust port formed in the inner wall.

  The exhaust structure according to a second aspect is the exhaust structure according to the first aspect, wherein the inner wall is made of a shield member that shields electromagnetic waves.

  The exhaust structure according to claim 3 is the exhaust structure according to claim 1 or 2, wherein the size and positional relationship of each vent hole of the exhaust port formed in the outer wall and the inner wall is defined as an exhaust port formed in the outer wall. It is characterized in that it is set so that a predetermined coin does not enter the inside.

  The exhaust structure according to claim 4 is the exhaust structure according to any one of claims 1 to 3, wherein the test finger is set to a size that does not pass through each vent hole of the exhaust port formed in the outer wall. It is characterized by.

  According to a fifth aspect of the present invention, there is provided a projection display apparatus comprising the exhaust structure according to any one of the first to fourth aspects for cooling a heat-generating component and modulating light emitted from a light source lamp based on a video signal. In addition, the modulated image light is enlarged and projected.

  According to a sixth aspect of the present invention, there is provided an electronic apparatus comprising the exhaust structure according to any one of the first to fourth aspects, wherein the heat generating component is cooled.

  According to the exhaust structure of claim 1 of the present invention, each vent hole of the exhaust port formed in the metal inner wall is formed to be small corresponding to a predetermined safety standard, and the interval between each vent hole is also formed to be small. While increasing the aperture ratio, each vent of the exhaust port formed on the outer wall made of resin is made larger than each vent of the exhaust port formed on the inner wall, so that fingers and foreign objects can be inserted from the exhaust port Since the aperture ratio of the metal exhaust port can be realized while solving problems such as a decrease in the strength of the exhaust port and an increase in the exhaust port temperature, the exhaust efficiency can be increased.

  According to the exhaust structure of the second aspect, since the inner wall is made of a shield member that shields electromagnetic waves, leakage of electromagnetic waves can also be prevented.

  According to the exhaust structure of claim 3, the size and positional relationship of the vent holes of the exhaust port formed in the outer wall and the inner wall are set so that a predetermined coin does not enter inside the exhaust port formed in the outer wall. As a result, foreign matter such as coins can be prevented from entering between the exhaust port formed in the outer wall and the exhaust port formed in the inner wall.

  According to the exhaust structure of claim 4, by setting each vent hole of the exhaust port formed in the outer wall to a size that does not allow the test finger to penetrate, even when the metal inner wall becomes hot, it is made of resin. Since a finger cannot be inserted from each vent hole of the exhaust port formed in the outer wall of the hood, safety is improved.

  According to the projection type image display device of the fifth aspect, since the exhaust structure as described above is employed, a light source lamp, a power source, and the like that have a considerably high temperature are incorporated in the device. A projection type image display apparatus capable of increasing the exhaust efficiency without causing insertion of a finger or a foreign object from the mouth, a decrease in strength of the exhaust port, an increase in the temperature of the exhaust port, etc. can be realized and is particularly effective.

  According to the electronic device of the sixth aspect, by adopting the exhaust structure as described above, it is possible to exhaust without causing insertion of a finger or a foreign object from the exhaust port, a decrease in the strength of the exhaust port, an increase in the exhaust port temperature, or the like. An electronic device capable of increasing efficiency can be realized.

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

  1 to 3 are perspective views showing an overall configuration of a liquid crystal projector according to an embodiment of the present invention. FIG. 1 is an external perspective view seen from the rear side obliquely upward, and FIG. 2 is an upper case and a control board. FIG. 3 is a perspective view of the optical system with the optical system removed.

  As shown in FIG. 1, the main body case 2 that forms the outline of the liquid crystal projector 1 is made of resin, has a slightly horizontally long box shape, and an operation display unit 3 is provided at the center of the upper surface of the upper case 2a. It has been.

  In addition, an air inlet 4 for cooling is formed in the lower left side on the back side, and an AV panel 5 in which an input / output terminal group for connecting various input / output cables such as video and audio is exposed above. Is provided. The air inlet 4 is formed by a lid 6 having a large number of slit-shaped vents that can be opened and closed, and a filter (not shown) can be attached and detached by opening the opening and closing lid 6.

  On the other hand, on the right side when viewed from the back side, an exhaust port 7 composed of a large number of slit-like vent holes is formed from the upper case 2a to the lower case 2b.

  As shown in FIG. 2, the projection lens 8 is exposed on the front side. Inside the main body case 2 (lower case 2b), a light source lamp unit 9 is disposed at the left back when viewed from the front, and an optical system 10 extending from the light source lamp unit 9 to the projection lens 3 is substantially L. It is arranged in a letter shape.

  A power supply unit 11 is disposed on the exhaust port 7 side of the projection lens 8. Between the power supply unit 11 and the exhaust port 7, an axial fan (propeller fan) 12 for cooling around the power supply is incorporated as an exhaust fan. Further, as the exhaust fan, an axial fan (propeller fan) 13 for cooling around the lamp is built in parallel with the axial fan 12 and adjacent to the light source lamp unit 9. Further, the light source lamp unit 9 is composed of an ultra-high pressure mercury lamp or the like and has a considerably high temperature. Therefore, a centrifugal fan (sirocco fan) 14 dedicated to lamp cooling is separately provided.

  On the other hand, as shown in FIG. 3, inside the air inlet 4 are two centrifuges serving as air intake fans for cooling liquid crystal panels for each color of RGB (red, green, blue) and polarizing plates, polarizing beam splitters, and the like. Fans (sirocco fans) 15 and 15 are built in, and cooling air from these centrifugal fans 15 is blown from a blowout port 17 to an optical component such as a liquid crystal panel and a polarizing plate or a polarizing beam splitter through a discharge side duct 16. These are designed to be cooled.

  4A and 4B are diagrams showing the exhaust structure of the present embodiment, in which FIG. 4A is an external perspective view of the exhaust port portion, and FIG. 4B is a metal exhaust port that is difficult to see in FIG. It is a perspective view.

  In the present embodiment, an exhaust port 17 formed in the metal inner wall 16 is provided inside the above-described exhaust port 7 formed in the resin outer wall (upper case 2a and lower case 2b). The inner wall 16 is formed of a shield member such as aluminum that shields electromagnetic waves, and also serves as a shield case.

  Both the resin exhaust port 7 and the metal exhaust port 17 are composed of a large number of vent holes 7a, 17a. Each of the vent holes 17a of the metal exhaust port 17 is formed to be small corresponding to a predetermined safety standard. At the same time, the gaps between the air holes 17a are also made small to increase the aperture ratio as much as possible.

  Specifically, as shown in FIG. 4 (b), a metal exhaust port to such an extent that test fingers imitating fingers and small coins (generally known US dime coins, etc.) as foreign objects cannot be inserted inside. Each of the 17 air holes 17a is formed in a small rectangular shape, and the interval between the air holes 17a is made thin so as to be almost linear by making use of metal, and the aperture ratio is improved so as to form a net as a whole. Yes.

  On the other hand, each vent hole 7a of the resin exhaust port 7 is formed in a horizontally long elongated hole shape larger than the vent hole 17a of the metal exhaust port 17, so that the interval between the vent holes 7a cannot be made too small. The aperture ratio is formed so as not to decrease.

  Further, in the present embodiment, the size and positional relationship of the air holes 7a and 17a of the resin exhaust port 7 on the outside and the metal exhaust port 17 on the inside are small as foreign matters inside the resin exhaust port 7. It is set not to accept coins. That is, the size of each vent hole 7a of the resin exhaust port 7 on the outside is reduced to such an extent that no coin can be inserted, or each of the metal exhaust ports 17 on the inner side is of a size that allows coins to enter. It is set so as not to enter the periphery of the vent hole 17a.

  Further, in the liquid crystal projector 1 according to the present embodiment, exhaust from the light source lamp unit 9 and the power supply unit 11 that are considerably hot is exhausted and the metal exhaust port 17 may be hot, so that the outer resin made Each vent hole 7a of the exhaust port 7 is set to a size that the test finger does not penetrate.

  5 to 9 are views showing the cooling structure of the present embodiment, FIG. 5 is a perspective view showing a power supply unit, an axial fan, and the like, FIG. 6 is a perspective view showing a duct removed from FIG. Is a side view seen from the fan side of FIG. 5, FIG. 8 is an exploded perspective view of FIG. 5, and FIG. 9 is a cross-sectional view of FIG.

  As shown in FIGS. 8 and 9, the power supply unit 11 of the liquid crystal projector 1 in the present embodiment includes a main power supply board 11 a that controls power supply to the entire apparatus and a lamp ballast board that controls power supply to the light source lamp unit 9. 11b. Each substrate 11a, 11b has many components 20a, 20b including heat generating components on one side, and high heat generation such as a power FET or a power diode that generates a large amount of heat among the heat generating components on the other side. Components 21a and 21b are mounted.

  The main power supply board 11a and the lamp ballast board 11b are arranged to face each other so that the surfaces on which the high heat generating components 21a and 21b are mounted face each other. Further, the high heat-generating components 21a and 21b of the respective substrates 11a and 11b are in contact with the metal shield plates 23a and 23b such as aluminum that shield electromagnetic waves through the heat conductors 22a and 22b having insulation properties. Each board | substrate 11a, 11b and each heat conductor 22a, 22b are screw-fixed and hold | maintained at each metal shield board 23a, 23b. If the high heat-generating parts 21a and 21b do not require insulation from the metal shield plates 23a and 23b, they are brought into direct contact with the metal shield plates 23a and 23b without passing through the heat conductors 22a and 22b. Also good.

  As shown in the exploded perspective view of FIG. 8, each of the metal shield plates 23a and 23b is formed in an inverted L shape in the longitudinal section, and the axial fan side described below is opened. Are formed so as to form a shield case that covers the substrates 11a and 11b when assembled.

  Then, on the open side of each of the metal shield plates 23a and 23b, as shown in FIG. 9, the suction port 12a having the same size as the distance between the high heat generating components 21a and 21b of the opposing substrates 11a and 11b. An axial fan 12 serving as a cooling fan having the above is arranged in accordance with the positions of the high heat generating components 21a and 21b of the substrates 11a and 11b facing the outer peripheral side of the suction port 12a. This is because the air volume is larger on the outer peripheral side of the suction port 12a.

  The axial flow fan 12 is covered with a duct 12c from the suction port 12a to the discharge port 12b, and the opening of the duct 12c on the suction port 12a side is set on the opening side of each metal shield plate 23a, 23b. The duct 12c opening is set on the metal exhaust port 17 side described above. Therefore, when the axial fan 12 is driven, the air sucked from the power supply unit 11 side is discharged from the resin exhaust port 7 to the outside of the apparatus through the metal exhaust port 17.

  The size of the inlet 12a of the axial fan 12 and the duct 12c are configured such that the cooling air from the axial fan 12 also flows on the outer surfaces of the metal shield plates 23a and 23b.

  In the above description, the axial flow fan 12 is used as a cooling fan. However, even when a centrifugal fan (sirocco fan) is used, the air volume on the outer peripheral side of the suction port is not as high as that of the axial flow fan. Since it is large, it may be configured in substantially the same manner as described above. In the above description, the case where the power supply unit 11 is disposed on the upstream side of the axial fan 12 has been described. However, when the power supply unit 11 is disposed on the downstream side of the axial fan 12, What is necessary is just to comprise substantially the same except the surface which opposes becomes the discharge port 12b from the suction port 12a.

  The liquid crystal projector 1 according to the present embodiment is configured as described above, and separates the light emitted from the light source lamp unit 9 shown in FIG. 2 into three colors of RGB via the optical system 10 and the liquid crystal for each color. The light is modulated by the panel based on the video signal, and the modulated video light is synthesized and enlarged and projected onto the screen via the projection lens 8.

  The liquid crystal panel for each color and the optical components such as the polarizing plate and the polarization beam splitter constituting the optical system 10 are provided from two centrifugal fans 15 and 15 built inside the air inlet 4 as shown in FIG. The cooling air is blown from the outlet 17 formed on the lower side of the optical component through the discharge side duct 16 and cooled.

  Further, the light source lamp unit 9 is cooled by being blown by the discharge air from the centrifugal fan 14 dedicated to cooling the lamp shown in FIG. 2, and the air around the lamp whose temperature has risen is sucked by the axial fan 13. It is cooled by being discharged out of the apparatus from the exhaust port 7.

  On the other hand, in the power supply unit 11, the temperature inside and surrounding air is sucked in by the axial fan 12 and is discharged out of the apparatus through the exhaust port 7, and the inside of the power supply unit 11 is sucked by the axial fan 12. Or cooled by the air flow generated on the outer surface.

  Further, according to the exhaust structure of the present embodiment, the vent holes 17a of the metal exhaust port 17 on the inner side are formed to be small corresponding to a predetermined safety standard, and the interval between the vent holes 17a is also formed to be small. While the opening ratio is increased, each vent hole 7a of the resin exhaust port 7 on the outside is formed larger than each vent hole 17a of the metal exhaust port 17, so that the insertion of a finger or a foreign object from the exhaust port, the exhaust port Since the aperture ratio of the metal exhaust port 17 can be realized while solving problems such as a decrease in strength and an increase in exhaust port temperature, the exhaust efficiency can be increased.

  Moreover, since the inner wall 16 in which the metal exhaust port 17 is formed is formed of a shield member such as aluminum that shields electromagnetic waves and serves also as a shield case, leakage of electromagnetic waves can be prevented.

  Furthermore, the size and positional relationship of the air holes 7a and 17a of the outer resin exhaust port 7 and the inner metal exhaust port 17 are set so that small coins as foreign matter do not enter the resin exhaust port 17. As a result, foreign matter such as coins can be prevented from entering between the outer resin exhaust port 7 and the inner metal exhaust port 17.

  In addition, when the vent holes 7a of the outer resin exhaust port 7 are set so as not to penetrate the test finger, the metal exhaust port 17 becomes hot due to exhaust from the light source lamp unit 9 or the power supply unit 11. In addition, since a finger cannot be inserted from the vent hole 7a of the resin exhaust port 7 on the outside, there is no risk of causing a burn or the like by touching the high temperature metal exhaust port 17, and safety is improved.

  By adopting the exhaust structure as described above in the projection display apparatus such as the liquid crystal projector 1 of the present embodiment, the light source lamp unit 9, the power supply unit 11, and the like that become considerably hot are included in the apparatus. Built-in, it is possible to realize a thing that can increase exhaust efficiency without causing insertion of fingers or foreign objects from the exhaust port, reduction in exhaust port strength, increase in exhaust port temperature, etc. is there.

  Further, according to the cooling structure of the present embodiment, the main power supply board 11a and the lamp ballast board 11b constituting the power supply unit 11 are opposed so that the surfaces on which the respective high heat-generating components 21a and 21b are mounted face each other. The high heat-generating components 21a and 21b of the opposing substrates 11a and 11b are brought into contact with the metal shield plates 23a and 23b via the insulating heat conductors 22a and 22b, and the opposing substrates 11a and 11b are arranged. The position of the high heat-generating components 21a and 21b of the substrates 11a and 11b with the axial flow fan 12 having the suction port 12a having the same size as the distance between the high heat-generating components 21a and 21b of the 11b facing the outer peripheral side of the suction port 12a. Since the axial flow fan 12 has a large air volume on the outer peripheral side of the suction port 12a, the high-heat-generating parts 21a and 21b By cooling air Kinakazeryou hits, the substrate 11a containing the high heat generating components 21a, 21b, it can be cooled 11b efficiently.

  Further, since the cooling air from the axial fan 12 is configured to flow also on the outer surfaces of the metal shield plates 23a and 23b, the high heat generating components 21a and 21b are brought into contact with each other through the heat conductors 22a and 22b. Since the metal shield plates 23a and 23b can be cooled from both sides, the substrates 11a and 11b including the high heat generating components 21a and 21b can be cooled more efficiently.

  Further, since the substrates 11a and 11b are held by the metal shield plates 23a and 23b, the metal shield plates 23a and 23b that shield electromagnetic waves also serve as the substrate holding, so that a separate holding member is not required and the cost is low. Can be achieved.

  Furthermore, the axial fan 12 is more effective because the air volume on the outer peripheral side of the suction port 12a and the discharge port 12b is particularly large.

  Further, since each of the substrates 11a and 12b constitutes the power supply unit 11, the power supply unit 11 is particularly effective because there are many high heat generating components 21a and 21b such as power FETs and power diodes.

  By adopting the above cooling structure in the projection display apparatus such as the liquid crystal projector 1 of the present embodiment, the main power supply board 11a and the lamp for driving the light source lamp are provided as the power supply unit 11 in the apparatus. Since the ballast substrate 11b is provided in a pair, the substrates 11a and 11b including a large number of the high heat generating components 21a and 21b can be efficiently cooled, which is particularly effective.

  In the above embodiment, a liquid crystal projector using a liquid crystal panel as a light modulation element is shown as a projection image display device. However, the present invention is also applied to a projection image display device having another image light generation system. Can do. That is, the present invention can be applied to a projector such as a DLP (Digital Light Processing; registered trademark of Texas Instruments (TI)) system. In addition to the front projection type, the present invention can be applied to a rear projection type image display apparatus.

  Further, not only in a projection display apparatus but also in general electronic equipment, by adopting the exhaust structure and cooling structure as described above, insertion of fingers and foreign objects from the exhaust port, reduction in strength of the exhaust port, An electronic device that can increase the exhaust efficiency without causing an increase in the temperature of the exhaust port or an electronic device that can efficiently cool a substrate including a high heat-generating component can be realized.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a perspective view showing an overall configuration of a liquid crystal projector as an embodiment of the present invention, and is an external perspective view seen from obliquely upward on the back side. The perspective view which removed the upper case, the control board, etc. similarly and was seen. The perspective view which removed the optical system and was seen similarly. It is a figure which shows the exhaust structure of this embodiment, (a) is an external appearance perspective view of an exhaust port part, (b) is the perspective view which took out the metal exhaust port difficult to see in (a), and showed it with the resin exhaust port. It is a figure which shows the cooling structure of this embodiment, and is a perspective view which shows a power supply unit, an axial fan, etc. The perspective view which removed and showed the duct from the said FIG. The side view seen from the fan side of the said FIG. The disassembled perspective view of the said FIG. FIG. 7 is a cross-sectional view of FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Liquid crystal projector 2 Main body case 2a Upper case 2b Lower case 4 Intake port 6 Opening / closing cover 7 Exhaust port 7a Vent hole 8 Projection lens 9 Light source lamp unit 10 Optical system 11 Power supply unit 11a Main power supply board 11b Lamp ballast board 12, 13 Axial flow Fan 12a Suction port 12b Discharge port 12c Duct 14, 15 Centrifugal fan 16 Inner wall 17 Exhaust port 17a Vent hole 21a, 21b High heat generating parts 22a, 22b Thermal conductor 23a, 23b Metal shield plate 23c Vent hole

Claims (6)

  A metal inner wall is provided on the inner side of the resin outer wall, an exhaust port comprising a plurality of vent holes is formed in the outer wall and the inner wall, and each vent hole of the exhaust port formed in the metal inner wall is set to a predetermined While forming small according to safety standards and forming a small interval between each vent hole to increase the opening ratio, each vent hole of the exhaust port formed on the resin outer wall is an exhaust formed on the inner wall. An exhaust structure characterized by being formed larger than each vent hole of the mouth.   The exhaust structure according to claim 1, wherein the inner wall is made of a shield member that shields electromagnetic waves.   The size and positional relationship of each vent hole of the exhaust port formed in the outer wall and the inner wall is set so that a predetermined coin does not enter inside the exhaust port formed in the outer wall. The exhaust structure according to claim 2.   The exhaust structure according to any one of claims 1 to 3, wherein each vent hole of the exhaust port formed in the outer wall is set to a size that does not allow a test finger to penetrate therethrough.   5. The exhaust structure according to claim 1, wherein the heat generating component is cooled, and light emitted from the light source lamp is modulated based on a video signal, and the modulated video light is enlarged and projected. Projection-type image display device characterized by the above. An electronic apparatus comprising the exhaust structure according to claim 1 to cool a heat-generating component.