JP4902466B2 - Intake structure, projection display apparatus using the same, and electronic equipment - Google Patents

Description

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

  Not only projection display devices such as liquid crystal projectors, but various electronic devices require a cooling fan for cooling internal heat generating components. In addition, a filter is provided at a cooling air intake port of a device that dislikes dust and dust intrusion (see, for example, Patent Document 1).

Although not described in Patent Document 1, in general, the intake port to which the filter is attached is provided with an opening / closing member such as an opening / closing door or an opening / closing lid for attaching / detaching the filter. When a shield member that shields air is attached, if the shield member is inserted between the filter and the opening / closing member, it becomes an obstacle when the filter is attached and detached, and it is difficult to maintain contact with other shield members around the intake port. Therefore, it is necessary to arrange the shield member between the air inlet and the filter.
JP 2006-267151 A

  However, when a shield member is arranged between the air inlet and the filter, one part is added between the air inlet and the filter, and a gap is generated between the filter and the air inlet, so that the filter performance is deteriorated. There was a problem to do.

  Therefore, the present invention has been made to solve such problems, and an intake structure that can improve filter performance even if a shield member is disposed between the intake port and the filter, and a projection type using the intake structure. An object of the present invention is to provide a video display device and an electronic device.

In order to achieve the above object, an intake structure according to claim 1 of the present invention is an intake structure in which a shield member that shields electromagnetic waves is attached to an intake port, a filter is attached, and an open / close member is closed. The filter is housed in a frame, and at least one of the frame and the opening / closing member is provided with an elastic engagement member that elastically contacts the other, and the filter is elastically attached to the intake port via a shield member. It is characterized in that it is configured to be pressed down.

  The air intake structure according to claim 2 is the air intake structure according to claim 1, wherein the elastic engagement member includes elastic pieces formed on both ends of the frame of the filter, and the opening and closing corresponding to the elastic pieces. It consists of pressing projections formed on both sides of the member so as to protrude toward the elastic piece.

  According to a third aspect of the present invention, in the intake structure according to the first or second aspect, the opening / closing member and the shield member are not arranged in a straight line with the cooling fan disposed inside the intake port. The pleated filter is formed by folding the filter medium between the open / close member and the shield member, and the fold groove connects the intake port of the open / close member and the intake port of the shield member. It is characterized by being formed and arranged so as to be parallel to the direction.

  An intake structure according to a fourth aspect is the intake structure according to the third aspect, wherein the intake port of the opening / closing member and the intake port of the shield member are formed so as to be shifted vertically.

  The intake structure according to claim 5 is characterized in that, in the intake structure according to claim 4, the intake port of the shield member is formed on the upper side and the intake port of the opening / closing member is positioned on the lower side. is there.

  According to a sixth aspect of the present invention, there is provided a projection display apparatus comprising the air intake structure according to any one of the first to fifth 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 seventh aspect of the present invention, there is provided an electronic apparatus comprising the air intake structure according to any one of the first to fifth aspects, wherein the heat generating component is cooled.

  According to the intake structure of claim 1 of the present invention, at least one of the filter and the open / close member is provided with an elastic engagement member that elastically presses the filter against the intake port via the shield member when the open / close member is closed. Since the intake port, the shield member, and the filter can be brought into close contact with each other, the filter performance can be improved even if the shield member is disposed between the intake port and the filter.

  According to the intake structure of the second aspect, the elastic engagement member is formed on the both ends of the filter frame and on the both sides of the opening / closing member corresponding to the elastic piece toward the elastic piece. Since it consists of the pressing protrusion formed in the protruding state, the filter performance can be improved at a low cost with a comparatively simple configuration.

  According to the intake structure of claim 3, the pleated filter is formed between the opening and closing member formed by shifting the intake port and the shield member, and the fold groove of the pleated filter connects the intake port of the opening and closing member and the intake port of the shield member. By arranging and arranging them in parallel, the pleated filter fold groove becomes the intake flow path, so there is no need to secure a space for the intake flow path. In addition, it can be prevented from leaking into the filter, and a space corresponding to the thickness of the filter can be used to prevent an increase in size.

  According to the intake structure of the fourth aspect, since the intake port of the opening / closing member and the intake port of the shield member are formed so as to be shifted up and down, even if the driving sound of the cooling fan slightly leaks from the intake port, Since the sound goes upward or downward, the influence on the user is reduced.

  According to the intake structure of the fifth aspect, since the intake port of the shield member is positioned on the upper side and the intake port of the opening / closing member is positioned on the lower side, the driving sound of the cooling fan slightly leaks from the intake port. However, since the leaked driving sound is directed downward, the influence on the user in a general installation form is particularly reduced.

  According to the projection type image display apparatus of the sixth aspect, since the above intake structure is employed, the filter system can be improved because it has the optical system that most dislikes the intrusion of dust. It is particularly effective.

  According to the electronic device of the seventh aspect, by adopting the intake structure as described above, the electronic component also dislikes the intrusion of dust, so that the filter performance can be improved, which is effective.

  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, a main body case 2 constituting the outline of the liquid crystal projector 1 has a slightly horizontally long box shape, and an operation display section 3 is provided at the center of the upper surface of the upper case 2a.

  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 intake port 4 is formed by a lid (opening / closing member) 6 in which a large number of slit-shaped vents can be opened and closed. By opening the opening / closing lid 6, a filter to be described later can be attached and detached.

  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.

  4 and 5 are views showing the intake structure of the present embodiment, FIG. 4 (a) is an exploded perspective view of the intake port portion, and FIG. 4 (b) is a perspective view of the relationship between the opening / closing lid and the filter as seen from the back side. FIG. 5 is a longitudinal sectional view of the main part of the intake port portion.

  In the present embodiment, the opening / closing lid 6 for attaching / detaching the filter is provided at the intake port 19 of the suction side duct 18 in the centrifugal fan 15 described above, and the shield member 20 for shielding electromagnetic waves is provided between the filter 21 and the opening / closing lid 6. If it is inserted into the filter, it will be in the way when the filter is attached and detached, and it will be difficult to maintain contact with other shield members around the intake port 19, so the filter 21 is mounted after the shield member 20 is mounted on the intake port 19. It is supposed to be.

  As shown in FIG. 5, each of the opening / closing lid 6 serving as the outer wall and the shield member 20 serving as the inner wall has a large number of passages so as not to be aligned with the centrifugal fan 15 disposed inside the air inlet 19. The intake ports 4 and 22 made of pores are formed in a shifted manner. Specifically, the intake port 4 of the open / close lid 6 and the intake port 22 of the shield member 20 are shifted up and down so that the intake port 22 of the shield member 20 is located on the upper side and the intake port 4 of the open / close lid 6 is located on the lower side. It is formed as follows. As a result, the drive sound that is emitted from the centrifugal fan 15 and leaks out from the intake port 19 of the suction side duct 18 is generated at the shield member 20 or the portion of the opening / closing lid 6 where the intake port is not formed, as indicated by the broken arrow. Since it is blocked, it is possible to prevent the drive sound from leaking directly from the air inlet 4 of the opening / closing lid 6 to the outside of the apparatus.

  Further, between the opening / closing lid 6 and the shield member 20, the pleated filter 21 formed by folding the filter medium 23 is connected in a direction in which the folding groove connects between the inlet 4 of the opening / closing lid 6 and the inlet 22 of the shield member 20. In this embodiment, it is formed and arranged so as to be in the vertical direction.

  In the present embodiment, the folding groove of the pleated filter 21 is directed in the vertical direction, but the intake port 4 of the opening / closing lid 6 and the intake port 22 of the shield member 20 are shifted in the left-right direction (lateral direction). In the case of forming, the folding groove of the pleated filter 21 also needs to be directed in the left-right direction.

  Further, as shown in FIG. 4, both side surfaces of the frame body 24 of the pleated filter 21 formed by folding a filter medium (not shown) are extended toward the opening / closing lid 6 and the front end side is slightly outward. A directed elastic piece 25 is formed. On the other hand, on both sides of the inner surface of the opening / closing lid 6 corresponding to the elastic piece 25, pressing protrusions 26 formed so as to protrude toward the elastic piece 25 are formed. When the opening / closing lid 6 is closed, the pressing protrusion 26 is formed. 26 is configured to engage and slidably contact the inner side of the elastic piece 25 of the filter frame body 24 so as to elastically press the filter 21 against the intake port 19 via the shield member 20.

  In the present embodiment, as described above, the elastic piece 25 is formed on the frame 24 side of the filter 21 and the pressing projection 26 is formed on the opening / closing lid 6 side, but conversely on the frame 24 side of the filter 21. A protrusion may be formed, and an elastic member may be formed on the opening / closing lid 6 side. Furthermore, an elastic member that elastically abuts on the other may be provided on only one of the frame body 24 and the opening / closing lid 6 of the filter 21. In short, at least one of the filter 21 and the opening / closing lid 6 may be provided with an elastic engagement member that elastically presses the filter 21 against the intake port 19 via the shield member 20 when the opening / closing lid 6 is closed.

  FIG. 6A is a perspective view showing a main part of the cooling fan mounting structure of the present embodiment, and FIG. 6B is a vertical sectional view of the main part.

  In the present embodiment, the centrifugal fan 15 as a cooling fan disposed inside the intake port 19 described above uses the lower case 2b of the main body case 2 as the centrifugal fan support member 27, and the centrifugal fan 15 on the suction port 15a side. A duct (suction side duct) 18 is attached to an attachment portion 29 which is a centrifugal fan cover member 28.

  The centrifugal fan 15 has a pair of positioning and fixing portions 15c and 15c projecting from the outer peripheral surface of the casing 15b, and screws corresponding to the positioning and fixing portions 27c and 27c projecting from the centrifugal fan support member 27 corresponding thereto. It is fixed by the above or the like, and is positioned and fixed to the mounting portion 29.

  Then, from both the lower centrifugal fan support member 27 and the upper centrifugal fan cover member 28 toward the centrifugal fan 15, with respect to the central portion of the centrifugal fan 15 on the blade side of the centrifugal fan 15 with respect to the positioning fixing portion 15 c. A pair of support protrusions 27a and 28a are provided in a symmetrical manner. Further, the lower and upper support protrusions 27a and 28a are arranged coaxially. In the present embodiment, the support protrusions 27a and 28a are formed corresponding to the outer peripheral edge of the casing 15b of the centrifugal fan 15 where a high strength can be obtained.

  Further, a ring-shaped elastic member 30 made of synthetic rubber or the like is attached to the front end surfaces of the support protrusions 27a and 28a with an adhesive or the like. That is, the centrifugal fan 15 is configured to be elastically supported so as to be sandwiched between the upper and lower support protrusions 28a and 27a having the elastic member 30 attached to the front end surface.

  In FIG. 6, only one of the two centrifugal fans 15 and 15 disposed inside the air inlet 19 is shown, but the other is configured in the same manner.

  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 discharged from the exhaust port 7 to the outside of the apparatus. Or cooled by the air flow generated on the outer surface.

  Further, according to the intake structure of the present embodiment, at least one of the filter 21 and the opening / closing lid 6 is elastically pressed against the intake port 19 via the shield member 20 when the opening / closing lid 6 is closed. By providing the engaging member, the air inlet 19, the shield member 20 and the filter 21 can be brought into close contact with each other, so that the filter performance can be improved even if the shield member 20 is disposed between the air inlet 19 and the filter 21. Can do.

  Further, the elastic engagement member protrudes toward the elastic piece 25 on both sides of the inner surface of the opening / closing lid 6 corresponding to the elastic piece 25 and the elastic piece 25 formed on both side surfaces of the frame body 24 of the filter 21. The filter performance can be improved at a low cost with a comparatively simple configuration.

  Further, the pleated filter 21 is connected between the opening / closing lid 6 formed by shifting the intake ports 4 and 22 and the shield member 20, and the folding groove connects the intake port 4 of the opening / closing lid 6 and the intake port 22 of the shield member 20. Since the folding groove of the pleated filter 21 serves as an intake passage and it is not necessary to secure a separate space for the intake passage, the centrifugal fan 15 can be The drive sound can be prevented from leaking directly to the outside of the apparatus, and only the space for the thickness of the filter 21 can be used, and the apparatus can be prevented from being enlarged.

  Further, the intake port 4 of the open / close lid 6 and the intake port 22 of the shield member 20 are shifted up and down so that the intake port 22 of the shield member 20 is located on the upper side and the intake port 4 of the open / close lid 6 is located on the lower side. As a result, even if the drive sound of the centrifugal fan 15 leaks slightly from the air inlet 4, the leaked drive sound is directed downward, so that the influence on the user in a general floor installation form is particularly reduced.

  In addition, by adopting the intake structure as described above in the projection display apparatus such as the liquid crystal projector 1 of the present embodiment, it is possible to suppress the drive sound of the centrifugal fan 15 from leaking from the intake port 4. Since the space for the thickness of the filter 21 is sufficient, an image can be viewed in a quieter environment, the apparatus can be prevented from increasing in size, and an optical system that is most resistant to dust intrusion is provided. Therefore, the filter performance can be improved and is particularly effective.

  Further, there is a conventional anti-vibration fan cover that covers the outer periphery of the fan. However, such an anti-vibration fan cover requires a specially shaped elastic member even for an axial fan that does not have a discharge port on the outer peripheral side, resulting in high costs. . On the other hand, according to the cooling fan (centrifugal fan) mounting structure of the present embodiment, a simple elastic member 30 to be attached to the front end surfaces of the support protrusions 27a and 28a is sufficient, so that an elastic member having a special shape is required. In addition, a structure that suppresses the vibration of the centrifugal fan 15 from propagating to the main body case 2 and becoming noise can be realized at low cost. Further, by supporting the blade side where vibration larger than that of the fixed portion 15c is generated via the elastic member 30 other than the fixed portion 15c of the centrifugal fan 15, a greater vibration damping effect than when the fixed portion 15c is provided with an elastic member. Can be obtained.

  In addition, when a conventional anti-vibration fan cover covering the outer periphery of the fan is applied to the centrifugal fan 15 having a discharge port on the outer peripheral side as in the present embodiment, a more complicated shape is required as compared with the axial fan. So it is more effective.

  Moreover, since each support protrusion 27a, 27a and 28a, 28a is arrange | positioned symmetrically with respect to the center part of the centrifugal fan 15, a big damping effect can be acquired, supporting in the stable state.

  Furthermore, since the lower and upper support protrusions 27a and 28a are arranged on the same axis, it is possible to obtain a great vibration damping effect while supporting them stably from both sides.

  Further, by using the suction side duct 18 of the centrifugal fan 15 for the centrifugal fan cover member 28, the suction side duct 18 can be effectively used and realized at low cost.

  Furthermore, by using the lower case 2b of the main body case 2 in which the centrifugal fan 15 is housed in the centrifugal fan support member 27, the lower case 2b of the main body case 2 can be effectively used and realized at low cost.

  Further, by adopting the cooling fan (centrifugal fan) mounting structure as described above in the projection display apparatus such as the liquid crystal projector 1 of the present embodiment, the vibration of the centrifugal fan 15 propagates to the main body case 2 and causes noise. Can be prevented at low cost and effectively, so that it is particularly effective to view images in a quieter environment.

  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 the projection display apparatus but also in general electronic equipment, by adopting the intake structure and the cooling fan mounting structure as described above, it is possible to suppress the leakage of the cooling fan drive sound from the intake port. In addition, the space for the thickness of the filter is sufficient, so that the size of the device can be prevented, the filter performance can be improved, and the vibration of the cooling fan can propagate to the device body to generate noise. An increase in size can be prevented inexpensively and effectively.

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 intake structure of this embodiment, (a) is a disassembled perspective view of an inlet part, (b) is the perspective view which looked at the relationship between an opening-and-closing lid and a filter from the back side. Similarly the principal part longitudinal cross-sectional view of an inlet port part. It is a figure which shows the cooling fan attachment structure of this embodiment, (a) is a perspective view which shows the principal part, (b) is the principal part longitudinal cross-sectional view.

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 lid 7 Exhaust port 8 Projection lens 9 Light source lamp unit 10 Optical system 11 Power supply unit 12, 13 Axial fan 14, 15 Centrifugal fan 15a Intake port 15b Casing 15c Positioning and fixing part 16 Discharge side duct 17 Outlet 18 Inlet side duct 19 Inlet 20 Shield member 21 Filter 22 Inlet 23 Filter medium 24 Filter frame 25 Elastic piece 26 Holding protrusion 27 Centrifugal fan support member 27a Support protrusion 27c Positioning and fixing Part 28 Centrifugal fan cover member 28a Support protrusion 29 Mounting part 30 Elastic member

Claims (7)

In a shield member for shielding electromagnetic waves in the intake port equipped with a mounting to either rough filter, closes the closing member intake structure,
The filter is housed in a frame, and at least one of the frame and the opening / closing member is provided with an elastic engagement member that elastically contacts the other, and the filter is elastically attached to the intake port via a shield member. An air intake structure characterized by being configured to be pressed against the air. The elastic engagement member includes an elastic piece formed on both ends of the frame of the filter, and a press formed in a state of projecting toward the elastic piece on both sides of the opening / closing member corresponding to the elastic piece. The intake structure according to claim 1, comprising a protrusion. Each of the opening / closing member and the shield member is formed by shifting the intake port so that it is not aligned with the cooling fan disposed inside the intake port, and a filter medium is provided between the opening / closing member and the shield member. The pleated filter formed by folding is formed and arranged so that its fold groove is parallel to a direction connecting the intake port of the opening / closing member and the intake port of the shield member. Item 2. The intake structure according to Item 2. 4. The intake structure according to claim 3, wherein the intake port of the opening / closing member and the intake port of the shield member are formed to be shifted up and down. 5. The intake structure according to claim 4, wherein the intake port of the shield member is formed on the upper side and the intake port of the opening / closing member is positioned on the lower side. 6. An air intake structure according to any one of claims 1 to 5, 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 intake structure according to claim 1 to cool a heat generating component.