JP2007011002A - Ventillation port structure, projection-type display apparatus, and computer - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To restrain the effect on ventillation efficiency, improve quiet operation, safety measures to cope with a case where a lamp is broken, light interception, and reduce mixing of foreign matters from the outside, in a projection-type display apparatus. <P>SOLUTION: The ventillation port structure includes an ventillation opening 1 for letting out ventillation; and ventillation opening covers 10 (ventillation panels 2 to 6), disposed in the ventillation opening 1 and having passage openings 16 through which discharge gas flows. The positions of the passage openings 16 differ from one another according to the distances from the ends of the ventillation opening covers 10 (ventillation panels 2 to 6). <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to an exhaust port structure and a projection display device, and more particularly to an exhaust port structure of a portable projection display device.

  In home appliances and the like, silence is required, and various noise reduction technologies have been developed. This tendency is the same not only for home appliances but also for general electronic devices. Especially for personal computer-related equipment, not only magnetic disk devices, CPU coolers, and power supply coolers that are computer components, but also projection-type display devices that are peripheral devices are required to be quiet regardless of whether they are large or small. Is expensive.

  The projection display device includes a particularly large heating element, and it is essential to perform cooling in order to ensure performance and reliability. The cooling method is roughly classified into two types, an air cooling method and a liquid cooling (water cooling) method, and the air cooling method is further classified into a natural air cooling method and a forced air cooling method. In the forced air cooling method, air is forcibly applied to an object to be cooled by various fans, or warm air inside the device is exhausted. Noise is generated from the cooling fan, but noise tends to increase if the cooling performance of the electronic device is improved. This problem is conspicuous in an electronic device having a large heating element, and tends to become more prominent in a small portable device. In an electronic device, an opening for exhaust is restricted in order to prevent a conductive foreign matter such as a clip from entering the device and a circuit from being short-circuited. The limitation is large due to restrictions. For this reason, the exhaust efficiency further decreases, and the temperature rise and noise increase of the exhaust part tend to become obvious.

  In the projection display apparatus, since a high-pressure mercury lamp is used in many devices, there is a possibility that the lamp bursts and glass pieces generated at that time are scattered outside the apparatus. For this reason, it is necessary to prevent the glass pieces from being scattered by the structure of the lamp unit, the internal structure of the apparatus, the exhaust panel structure, and the like. In addition, when the lamp is arranged in the vicinity of the exhaust opening, there is a problem that light leaked from the lamp leaks directly to the outside of the apparatus, causing discomfort to the user.

As described above, in portable devices, it is important to consider cooling performance, noise reduction (low noise), safety, and light shielding properties. For this reason, in order to improve safety and light shielding properties, a technique for bending a plurality of exhaust ducts (see Patent Document 1), cooling performance, noise reduction, and light shielding properties for light shielding properties are improved. And the like (see Patent Document 2) in which a lamp shade is provided between the two.
JP 2003-202630 A Japanese Patent Laid-Open No. 10-171362

  However, the conventional techniques described above have the following problems. These are problems that become apparent particularly in a small projection display device.

  First, in order to obtain the exhaust air volume necessary for cooling a projection display device having a large heating element, it is necessary to operate a plurality of small fans that can be mounted at a high speed, resulting in increased noise. . This is due to the fact that the absolute air volume is insufficient for a small fan, but it is also largely due to a decrease in the opening ratio of the exhaust opening. Here, the aperture ratio is an area ratio of the flow path opening to the cross-sectional area of the exhaust opening in a certain cross section. Moreover, an unpleasant sound is likely to be generated by rotating the fan at a high speed. For this reason, even if the noise level is suppressed to a low level, annoying frequency components are increased, which makes it feel noisy.

  Secondly, since the exhaust opening is disposed in the vicinity of the lamp, there is a risk that a piece of glass may jump out of the apparatus when the lamp bursts. This is because the absolute distance from the lamp is short, so high energy due to rupture cannot be absorbed by the shielding plate inside the device, but it can be bounced off by the shielding plate and discharged outside the device. is there. In order to prevent this, it is conceivable to use a fine mesh or the like for the exhaust opening, but it is difficult to adopt because the opening ratio is lowered and the internal temperature is raised.

  Thirdly, since the exhaust opening is disposed in the vicinity of the lamp, if the opening ratio of the exhaust opening is increased, the light leaked from the lamp leaks directly to the outside of the apparatus, giving the user unpleasant feeling. If the light is shielded near the lamp, the temperature of the lamp will be raised, which will adversely affect the lamp life, noise, etc., making it difficult to adopt.

  Of the above problems, the second and third problems can be solved to some extent by moving the lamp away from the exhaust opening. It is difficult. Furthermore, since the exhaust opening is disposed in the vicinity of the lamp, there is also a problem that the exhaust panel portion becomes very hot. The reason is that, since the absolute distance from the lamp is short, the exhaust heat cannot be sufficiently diffused, and the very high temperature exhaust from the lamp is directly discharged outside the apparatus.

  The present invention has been made in view of the above problems, and the present invention improves noise reduction, safety at the time of lamp breakage, and light shielding performance while suppressing the influence on exhaust efficiency, and further introduces foreign matter from the outside. An object of the present invention is to provide an exhaust port structure and a projection display device that can reduce the risk.

  The exhaust port structure of the present invention includes an exhaust opening that discharges exhaust to the outside, and an exhaust opening covering body that is provided in the exhaust opening and includes a flow path opening through which the exhaust flows. The position of the flow path opening differs depending on the distance from the end of the exhaust opening covering.

  According to the exhaust port structure of the present invention, the flow path shape is nonlinear and three-dimensional by shifting the position of the flow path opening in each cross section while ensuring a large opening area (opening ratio) as the flow path opening. Can be configured. Since a large opening area of the flow path opening can be secured, the pressure loss of the exhaust flow is suppressed, the influence on the exhaust efficiency is suppressed, and the quietness is improved. Further, since the flow path is configured in a non-linear and three-dimensional manner, the cross-sectional area where the outside (or the inside from the outside) can be directly viewed from the inside of the exhaust opening is reduced. For this reason, it becomes easy to prevent scattered matter from being discharged from inside, to prevent foreign matters from being mixed in, and to improve the light shielding property.

  The distance from the end portion can be a distance measured in the exhaust axis direction which is a direction orthogonal to the opening surface of the exhaust opening.

  The exhaust opening covering body includes a plurality of panels arranged in series along the exhaust axis direction, each of the plurality of panels including a plurality of flow path openings, and the flow path openings are at least partially. Adjacent panels are arranged so as to be shifted from each other on the projection plane in the exhaust axis direction.

  The plurality of channel openings may be different from each other between adjacent panels in at least one of arrangement pitch, size, and shape. The plurality of flow path openings may be the same between adjacent panels in arrangement pitch, size, and shape, and the center axis of each flow path opening may be offset from each other between adjacent panels.

  Desirably, at least one of the magnitude or direction of the shift of the central axis is different between one set of adjacent panels and another set of adjacent panels.

  It is desirable that the plurality of panels be arranged with a gap therebetween in the exhaust axis direction.

  At least some of the plurality of panels can be formed of a metal material. Alternatively, the panel provided on the most downstream side in the exhaust direction may be formed of a metal material, and a resin panel may be formed on the surface facing the exhaust direction.

  The panel provided on the most downstream side in the exhaust direction is formed of a resin material.

  The exhaust opening covering body has a metal foam material in which pores are connected to each other.

  The projection display device of the present invention includes the exhaust opening covering body and a casing that forms the exhaust opening.

  The computer according to the present invention includes the exhaust opening covering body and a casing that forms the exhaust opening.

  As described above, according to the present invention, the exhaust port that can suppress the influence on the exhaust efficiency, improve the silence, the safety when the lamp is broken, and the light shielding property, and further reduce the risk of contamination from the outside. A structure, a projection display device, and the like can be provided.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. FIG. 1 is an external perspective view showing an embodiment of a projection display device of the present invention. FIG. 2 is an exploded perspective view showing an exploded exhaust port structure of the projection display device shown in FIG.

  The projection display device 15 includes a light source lamp unit 11 in which a light source lamp and a reflector that reflects light from the light source lamp are incorporated in a housing 9 including an upper housing 9a and a lower housing 9b. A projection lens, an image display unit, an image control unit, a power supply unit, a cooling device (not shown except for the light source lamp unit 11), and the like are installed. The cooling device is a forced air cooling system provided with an exhaust fan (not shown), but may be a natural air cooling system. The cooling device may be either water cooling or air cooling. An exhaust opening 1 for discharging exhaust to the outside is formed on the back surface portion of the housing 9 opposite to the projection lens (not shown). Exhaust air from the exhaust fan passes through the housing 9 and is discharged from the exhaust opening 1.

  As shown in FIG. 2, an exhaust opening covering 10 is provided in the exhaust opening 1. The exhaust opening covering body 10 includes five exhaust panels 2 to 6 and is supported by the panel holder 8. The panel holder 8 is held in the exhaust opening 1 of the housing 9, but may be integrally formed with the housing 9. Assuming that the direction orthogonal to the opening surface of the exhaust opening 1 is the exhaust axis direction P, the exhaust panels 2 to 6 are directed along the exhaust axis direction P in the exhaust direction (see the white arrow in FIG. 2). 3,... Are arranged in series in this order. The exhaust gas passes through the exhaust panels 2, 3,... In this order, and is discharged to the outside. The exhaust panels 2 to 6 are arranged with a gap therebetween in the exhaust axis direction P.

  The exhaust panels 2 to 6 are made of a metal material having high thermal conductivity such as an aluminum alloy, and also function as a heat diffusion plate. That is, even if the light source lamp unit 11 and the exhaust opening 1 are close to each other as in this embodiment, the heat received by the exhaust panels 2 to 6 is dissipated by heat transfer to the housing 9 or heat dissipation to the atmosphere. The exhaust heat effect is increased. As a result, it is possible to prevent the exhaust port structure from locally becoming hot as compared with the case of a single panel, and the exhaust panel on the outermost surface of the projection display device 15 (the exhaust panel 6 in this embodiment). ) Surface temperature can be reduced. A panel 7 made of resin is formed on the surface of the exhaust panel 6 facing the exhaust direction, that is, the portion constituting the outer surface of the projection display device 15. Since the resin-made panel 7 has low thermal conductivity, the temperature sensed when the user accidentally contacts is suppressed. The exhaust panel 6 may be formed of only a resin material.

  The position of the flow path opening of the exhaust opening covering 10 (in this embodiment, an aggregate of exhaust panels) is from the end of the exhaust opening covering measured in the exhaust axis direction, which is the direction orthogonal to the opening face of the exhaust opening. Depending on the distance. The plurality of exhaust panels are each provided with a plurality of flow path openings, and the flow path openings are arranged so as to be displaced from each other on the projection surface in the exhaust axis direction at least between the adjacent exhaust panels. Hereinafter, this point will be described in detail with reference to the drawings.

  FIG. 3 is a plan view of the state in which all the exhaust panels are arranged as viewed from the exhaust axis direction. FIG. 1A is an overall plan view. FIG. 4B is a partially enlarged view of FIG. 4A. For the sake of clarity, only the exhaust panel 6 shows two flow path openings, and the other exhaust panels have only one flow path opening. Show. FIG. 4 is a partial plan view of the exhaust panel provided on the most downstream side in the exhaust direction and the exhaust panel on the upstream side of the exhaust panel as viewed from the exhaust axis direction. FIG. 5 is a partial perspective view of the exhaust panel shown in FIG.

  When viewed from the exhaust direction along the exhaust axis direction P, as shown in FIG. 3 (a), the exhaust panel 6 is disposed on the foremost side so that the exhaust panels 5, 4, 3, and 2 are overlapped in this order. ing. Each exhaust panel 2-6 has the same plate thickness and outer shape, and each exhaust panel 2-6 is formed with a plurality of channel openings 16 that are channels through which exhaust flows (see FIG. 4). In FIG. 5, the exhaust panels 2, 3 and 4 are not shown, but are the same as the exhaust panels 5 and 6). The flow path openings 16 have the same shape and the same size (9 mm square) in each of the exhaust panels 2 to 6, and the arrangement pitch is also the same. The width of the lattice portion 18 that partitions the flow path opening 16 is 1 mm. As a result, the aperture ratio of each exhaust panel is about 80%.

  The flow path openings 16 of the exhaust panels 2 to 6 are displaced by 2 mm from each other in the vertical and horizontal directions in the drawing on the projection plane in the exhaust axis direction with reference to the outer peripheral part of the assembly of the flow path openings 16. In other words, the position of the flow path opening 16, that is, the central axis 19 of each flow path opening 16, is shifted from each other between the exhaust panels when viewed from the exhaust axis direction P. The two central axes 19 shown in FIG. 3 (b) indicate the central axes of the exhaust panels 5 and 6, respectively. In this way, an opening that can be viewed directly from the outside of the projection display device 15 to the inside of the exhaust opening 1 when viewed from the exhaust axis direction P, that is, an opening obtained when the exhaust panels 2 to 6 are projected in the exhaust axis direction P. 17 can be configured three-dimensionally using the overlap of the exhaust panels 2 to 6. The openings 17 are 1 mm square, and the arrangement pitch is 2 mm.

The relationship between the horizontal and vertical displacement pitch P of the exhaust panel, the width d of the lattice portion 18, the number N of exhaust panels, and the opening length (side length) W of the flow path opening 16 is as follows:
W = P * N−d (1)
At this time, the openings 17 having a side length (Pd) are arranged at a pitch P. In the case of the above configuration, 2 * 5-1 = 9, and the flow path opening 16 can be secured up to 9 mm square. From equation (1), it can also be seen that the size of the flow channel openings of each exhaust panel can be increased as the number of flow channel openings is increased. The displacement pitch P of the exhaust panel and the width d of the lattice portion 18 dominate the size (Pd) of the openings 17 and the arrangement pitch P, but these specifications are necessary to prevent foreign matter from entering from the outside. It is determined from the fineness of the 17 eyes and the fineness of the eyes required for the barrier function to prevent direct contact with the dangerous part.

  The magnitude and direction of the flow path opening 16, i.e. the center axis 19, is different between one set of adjacent panels and another set of adjacent panels. Specifically, in FIG. 3B, the exhaust panel 4 is displaced 6 mm in the right direction and upward direction with respect to the exhaust panel 5, but the exhaust panel 3 is in the left direction and downward direction with respect to the exhaust panel 4. 4 mm each. Thus, by preventing the exhaust panels from being regularly displaced in a certain direction, the openings 17 are prevented from being formed in a straight line in a specific direction such as an oblique direction. It is most effective to make both the magnitude and direction of the deviation different, but either one may be different. It is desirable that the deviation of the central axis 19 is arranged so that the light from the light source lamp unit 11 cannot be directly seen.

  The flow path openings do not necessarily have to be aligned with each other in each exhaust panel, and at least one of these elements may be different between adjacent panels. That is, the flow path opening of each panel does not need to be rectangular and does not need to have the same shape. Any shape can be used as long as the pitch and size of the openings can be suppressed to a certain value or less.

  As described above, in the exhaust port structure of the present embodiment, the flow path shape along the exhaust axis direction (space path connecting the inside of the housing to the outside) by shifting the flow path opening of the exhaust panel with each exhaust panel. ) In a non-linear and three-dimensional manner. The opening ratio of each exhaust panel is as large as about 80%, and the pressure loss of the exhaust flow can be suppressed to a sufficiently small level, so that the exhaust efficiency is good and it is not inferior to the conventional single panel structure. . Since the exhaust efficiency is good, the rotational speed of the exhaust fan can be kept low, which is advantageous for realizing low noise. On the other hand, even if the light source lamp breaks and a glass piece is generated, there is almost no straight path connecting the inside and the outside of the housing, so the glass piece may be blocked by one of the exhaust panels and scattered outside Is reduced. The same applies to light leakage from the light source lamp, and since there are almost no linear paths, light leakage to the outside is less likely to occur. The same applies to the entry of foreign matter from the outside to the inside, and foreign matter that has entered from the outside is blocked by any of the exhaust panels, thereby reducing the possibility of entering the inside of the housing. Furthermore, since the exhaust panel is composed of a plurality of metal panels, the effect as a heat diffusion body is high, a local temperature rise near the exhaust port is prevented, and the safety effect is enhanced.

  FIG. 6 is a plan view of the exhaust panel showing another arrangement method of the exhaust panel. FIG. 4A is an overall plan view, and FIG. 4B is a partially enlarged view of FIG. In FIG. 6B, for the sake of clarity, only the exhaust panel 106 shows two flow path openings, and the other exhaust panels show only one flow path opening. In this embodiment, the displacement pitch of the exhaust panel is 2 mm, and the width of the lattice portion 118 is 2 mm. Moreover, the dimension of the flow path opening 116 is set to 8 mm from the equation (1). In this case, the opening ratio of each of the exhaust panels 102 to 106 is about 63%, which is the same as that of a normal opening, but the size of the three-dimensionally configured opening is 0 mm, and the opening that is linearly connected in the apparatus is eliminated. be able to. Thereby, it is possible to more effectively prevent the glass piece from popping out when the lamp is ruptured and mixing of foreign matter from the outside.

  FIG. 7 is an external perspective view of a projection display device showing a second embodiment of the present invention. The projection display device 115 is different from the first embodiment only in the exhaust port structure, and other parts have the same structure. The exhaust opening covering body is composed of a metal plate 12 having a spongy structure installed in the exhaust opening 1. The metal plate 12 is made of a metal foam material in which pores are connected to each other, and exhaust gas is sequentially discharged through the pores to the outside. The net 13 having a high aperture ratio is arranged outside the metal plate 12 to serve as a protection for the metal plate 12 due to the fine metal structure of the metal plate 12 and a barrier structure for preventing the user from touching the hand directly. Yes. The net 13 may be metallic or resinous, but if it is made of resin, the temperature at which it is touched can be reduced. The metal plate 12 and the net 13 are held by a plate holder 14. Also in this embodiment, if a metal plate having sufficient pores (aperture ratio) is employed, it is possible to ensure the necessary exhaust efficiency, and the first is the light-shielding property and the safety when the lamp is broken. Further advantageous effects can be obtained compared to the embodiment.

  As described above, according to the exhaust port structure and the projection display device of the present invention, while suppressing the influence on the exhaust efficiency, the noise reduction, the safety when the lamp is broken, the light shielding property are improved, and the foreign matter from the outside The risk of contamination can be reduced. The present invention can be effectively applied particularly to a small projection display device. However, the present invention is not limited to this and can be applied to all projection display devices. Furthermore, the present invention can be widely applied to general electronic devices having a heat source therein, such as a personal computer and a large computer.

It is an external appearance perspective view which shows one Embodiment of the projection type display apparatus of this invention. It is a disassembled perspective view which decomposes | disassembles and shows the exhaust port structure of the projection type display apparatus shown in FIG. It is the top view which looked at the condition where all the exhaust panels were arranged from the exhaust-axis direction. It is the partial top view which looked at the exhaust panel provided in the most downstream side of the exhaust direction and the exhaust panel of the one upstream side from the exhaust-axis direction. It is a fragmentary perspective view of the exhaust panel shown in FIG. It is a top view of the exhaust panel which shows the other arrangement | positioning method of an exhaust panel. It is an external appearance perspective view of the projection type display apparatus which shows the 2nd Embodiment of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Exhaust opening 2,3,4,5,6 Exhaust panel 7 Panel 8 Panel holder 9 Housing | casing 9a Upper housing | casing 9b Lower housing | casing 10 Exhaust opening covering body 12 Metal plate 13 Net 14 Plate holder 15, 115 Projection type display apparatus 16 Channel opening 17 Opening 18 Lattice 19 Central axis P Exhaust axis direction

Claims (13)

An exhaust opening for discharging the exhaust to the outside;
An exhaust opening covering body provided at the exhaust opening and provided with a flow path opening through which the exhaust flows;
Have
Depending on the distance from the end of the exhaust opening covering, the position of the flow path opening is different.
Exhaust port structure.   The exhaust port structure according to claim 1, wherein the distance from the end portion is a distance measured in an exhaust axis direction that is a direction orthogonal to an opening surface of the exhaust opening. The exhaust opening covering body has a plurality of panels arranged in series along the exhaust axis direction,
Each of the plurality of panels includes a plurality of the flow path openings, and the flow path openings are arranged so as to be shifted from each other on the projection surface in the exhaust axis direction between at least some of the adjacent panels. Being
The exhaust port structure according to claim 2.   The exhaust port structure according to claim 3, wherein the plurality of flow path openings are different from each other in at least one of arrangement pitch, size, and shape between the adjacent panels.   The plurality of flow path openings are the same in the arrangement pitch, size, and shape between the adjacent panels, and the central axis of each flow path opening is shifted from each other between the adjacent panels. Item 4. The exhaust port structure according to Item 3.   The exhaust port structure according to claim 5, wherein at least one of the magnitude or direction of the deviation of the central axis is different between one set of adjacent panels and another set of adjacent panels. .   The exhaust port structure according to any one of claims 3 to 6, wherein the plurality of panels are arranged with a gap therebetween in the exhaust shaft direction.   The exhaust port structure according to any one of claims 3 to 7, wherein at least some of the plurality of panels are formed of a metal material.   The exhaust port structure according to claim 8, wherein the panel provided on the most downstream side in the exhaust direction is formed of a metal material, and a resin panel is formed on a surface facing the exhaust direction.   The exhaust port structure according to claim 8, wherein the panel provided on the most downstream side in the exhaust direction is formed of a resin material.   The exhaust opening structure according to claim 1 or 2, wherein the exhaust opening covering body has a metal foam material in which pores are connected to each other. The exhaust opening covering body according to any one of claims 1 to 11,
The housing forming the exhaust opening according to any one of claims 1 to 11,
A projection display device. The exhaust opening covering body according to any one of claims 1 to 11,
The housing forming the exhaust opening according to any one of claims 1 to 11,
Having a calculator.

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