JP2010282141A - Projection type video display - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To solve such a problem that there is a risk of covering an intake or an exhaust port at a place where a wall, a column and other obstacles exist in an environment where a cooling means is installed, so that sufficient cooling performance is not secured. <P>SOLUTION: A projection type video display includes: a heat generating part inside an outer housing; the cooling means for cooling the heat generating part, outside the outer housing; and a cooling path which is flexibly deformable and connects the cooling means and the outer housing. The cooling means includes an intake unit and an exhaust unit and the intake unit and the exhaust unit are configured as a separate body. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a method for cooling a heat generating portion in a projection display apparatus having a heat generating portion inside an exterior casing.

  2. Description of the Related Art Conventionally, there is known a projection display apparatus in which light from a light source is optically modulated by a liquid crystal panel based on an input video signal, and the optically modulated light is enlarged and projected through a projection lens.

  This projection display apparatus requires a high-intensity light source for enlarging and projecting light. Naturally, when the light source is used, a large amount of heat is generated from the light source, and the heat stays inside the projection display apparatus. This accumulated heat is a hindrance to the normal operation of the projection display, and it is necessary to have a cooling means to remove heat not only to the light source but also to the power supply circuit block that is another heat generation source. It is. In addition, liquid crystal panels and polarizing plates do not generate heat directly, but generate heat due to heat from heat sources such as light sources and power circuit blocks, and are vulnerable to heat. However, a cooling means for removing heat is necessary.

  Usually, heat is removed by disposing cooling means inside the outer casing of the projection display and providing a cooling path to circulate air as a refrigerant in the projection display. However, by arranging the cooling means inside the projection display apparatus, an operation sound is generated from the cooling means, and a problem relating to the noise of the projection display apparatus occurs.

  Japanese Patent Application Laid-Open No. 2004-151561 is made to solve such a problem. Cooling means is disposed at a position separated from the projection image display device main body and separated from the user, and the cooling means and the projection image display device are arranged. The projection type image display apparatus is cooled by providing the connecting ventilation means. With such a configuration, the cooling unit can be isolated from the place where the user is present, so that it is possible to suppress the noise of the projection display apparatus from being heard by the user.

JP 2005-164767 A

  However, the cooling means arranged separately from the projection display apparatus includes an intake fan and an exhaust fan as a single unit, and the intake port and the exhaust port are arranged in directions different by 180 °. In the structure of this cooling means, if the place where the cooling means is installed is a place where there are walls, pillars or other obstacles, there is a risk of blocking the intake or exhaust port, and sufficient cooling performance cannot be secured. There was a problem.

  In view of such problems, it is an object of the present invention to provide a projection display apparatus capable of installing a cooling unit corresponding to a difference in installation environment and performing smooth intake / exhaust.

  In order to achieve the above-mentioned object, a heat generating part inside the exterior casing, a cooling means for cooling the heat generating part which is outside the exterior casing, and can be flexibly deformed, the cooling means and the And a cooling path connecting the exterior housing, wherein the cooling means includes an intake unit and an exhaust unit, and the intake unit and the exhaust unit are configured separately. The feature is a projection type image display apparatus.

  In the projection display apparatus having the above-described configuration, the cooling unit and the cooling path may be connected such that the cooling unit is rotatably connected to the cooling path.

  In the projection display apparatus having the above-described configuration, the cooling path connected to each of the intake unit and the exhaust unit may be connected to a facing surface of the exterior casing.

  By adopting such a configuration, it is possible to install the cooling means corresponding to the difference in installation environment and perform smooth intake and exhaust.

1 is a basic configuration diagram showing a projection display apparatus of the present invention. It is the 1st installation drawing of the projection type video display of the present invention. It is the 2nd installation figure of the projection type video display of the present invention. FIG. 4 is a detailed connection diagram (not connected) of the intake unit and the introduction cooling path of the present invention. FIG. 5 is a detailed connection diagram (already connected) of the intake unit and the introduction cooling path of the present invention. It is the 3rd installation figure of the projection type video display of the present invention. It is the perspective view which observed the projector main body of this invention from the upper surface. It is the block diagram which showed the projection optical system of this invention.

  Hereinafter, a projection display apparatus according to the present invention will be described with reference to FIGS.

  It should be noted that the drawings of the present invention are schematic diagrams, and the detailed shapes, dimensions, and ratios are different. In addition, the detailed shapes, dimensions, and ratios are different between the drawings.

  In addition, the same or similar parts are denoted by the same reference numerals with respect to different drawing numbers, and redundant description is omitted.

Further, the present configuration diagram shows one embodiment, and the present invention may be used in a different mode, and is interpreted as being limited to this embodiment. It should be noted that it is not a thing (whole structure)
FIG. 1 is a configuration diagram showing a configuration using a projection display apparatus 31 of the present invention. In this configuration, a ceiling board 32 is installed on the ceiling in the room, and is divided into an attic space 33 and a living space 34.

  The projector main body 35, the ceiling plate fixture 36, the introduction cooling passage 37, and the outlet cooling passage 38 are positioned below the ceiling plate 32, and the intake unit 39, the exhaust unit 40, the ceiling shaft 41, and the housing are fixed. The tool 42 is located above the ceiling board 32.

  The projection display 31 includes a projector main body 35, an intake unit 39, an introduction cooling path 37, an exhaust unit 40, and a lead-out cooling path 38.

  The projector main body 35 includes a plurality of video input terminals and a plurality of audio input terminals on the back surface portion, and receives video and audio signals from an electronic device connected to the video input terminals and the audio input terminals. The light from the light source is optically modulated by the liquid crystal panel based on the input video signal, and the optically modulated light is enlarged and projected through the projection lens 26. In addition, the projector main body 35 includes a heat generating part such as a light source and a power supply block and a liquid crystal panel and a polarizing plate that cannot bring out normal performance when affected by heat.

  The intake unit 39 has an intake fan 43 disposed therein. The intake fan 43 rotates to take air outside the intake unit 39 into the intake unit 39, and the inside of the intake unit 39 is pressurized to discharge air from the introduction port 44.

  The introduction cooling path 37 is formed of a hose (for example, a bellows-like hose) that itself has flexibility and can expand and contract a certain amount. The introduction cooling path 37 has one end connected to the introduction port 44 and the other end connected to an inlet 45 on one side of the projector main body 35. Accordingly, the air discharged from the inlet port 44 of the intake unit 39 is guided to the inlet cooling path 37, and the air is sent to the inlet 45 of the projector main body 35.

  The interior of the projector main body 35 requires a structure for cooling a heat generating part such as a light source and a power supply block, a member such as a liquid crystal panel and a polarizing plate, and a ventilation (not shown) for guiding air to each cooling part. A road is provided. That is, the air sent to the inflow port 45 of the projector main body is diverted by this ventilation path, and after cooling the cooling unit, it is collected again by the ventilation path toward the outflow port 46, and the air is guided to the outflow port 46.

  The lead-out cooling path 38 is formed of a hose (for example, a bellows-like hose) in which the lead-out cooling path 38 itself has flexibility and can be expanded and contracted by a certain amount. The lead-out cooling path 38 has one end connected to the lead-out port 47 of the exhaust unit 40 and the other end connected to the outlet 46 located on the side surface facing the inlet 45 of the projector main body 35. Therefore, the air discharged from the outlet 46 of the projector main body 35 is guided to the outlet cooling path 38 and the air is sent to the outlet 47 of the exhaust unit 40.

  The exhaust unit 40 has an exhaust fan 48 disposed therein. The exhaust fan 48 rotates to discharge air inside the exhaust unit 40 to the outside of the exhaust unit 40, and discharges air from the outlet 47 to the outside of the exhaust unit 40 by reducing the pressure inside the exhaust unit 40. .

  The ceiling plate fixture 36 is designed exclusively for the projector main body 35, and the ceiling plate 32 and the projector main body are mounted using a screw fixing fixing portion disposed on the surface of the projector main body 35 on which the ceiling plate fixture 36 is fixed. 35 is fixed by screwing.

  The ceiling suspension shaft 41 is a shaft body that firmly connects the ceiling plate fixture 36 and the frame fixture 42.

  The housing fixing tool 42 substantially supports the projector main body 35 when the ceiling plate 32 is thin and poor, and is screwed and fixed to the indoor housing.

  Further, as shown in FIG. 2, when the obstacle 51 exists in the vicinity of the surfaces arranged on the intake fan 43 and the exhaust fan 48, the intake by the intake fan 43 and the exhaust by the exhaust fan 48 are hindered, and the cooling is sufficiently performed. It becomes impossible to cool the parts. However, if the intake unit 39 and the exhaust unit 40 are separate bodies as in the present configuration, and the introduction cooling path 37 and the outlet cooling path 38 are formed of flexible materials, the intake air unit 39 and the exhaust unit 40 are separated from the obstacle 51 as shown in FIG. Since the unit 39 and the exhaust unit 40 can be installed, the cooling means can be installed corresponding to the difference in installation environment, and smooth intake and exhaust can be performed.

  Moreover, since air can be discharged to the back of the ceiling, an increase in the temperature of the living space 34 in which the projector main body 35 is installed can be suppressed.

  In addition, since the intake unit 39 and the exhaust unit 40 are configured separately, the intake unit 39 and the exhaust unit 40 can be installed at a distance. Therefore, since it is possible to suppress the intake unit 39 from taking in the warmed air exhausted by the exhaust unit 40, it is possible to suppress deterioration of the cooling performance of the heat generating portion inside the projector main body 35.

  In addition, since the intake fan 43 and the exhaust fan 48 can be arranged behind the ceiling, it is possible to suppress the noise of the fan from being transmitted to the living space 34.

  Further, since it is not necessary to arrange the intake fan 43 and the exhaust fan 48 in the projector main body 35, the projector main body 35 can be reduced in size.

  Further, when the inlet 45 and the outlet 46 of the projector main body 35 are arranged on the same surface, the cooling air can be spread over the entire projector main body 35 by arranging the projector main body 35 on the opposite side surfaces. .

Further, when the intake unit 39 and the exhaust unit 40 are installed on the back of the ceiling by arranging the inlet 45 and the outlet 46 of the projector main body 35 on the same surface rather than on the opposite side surfaces of the projector main body 35. The distance between each other can be further increased. Therefore, since it is possible to suppress the intake of the warmed air discharged from the exhaust unit 40 by the intake unit 39, it is possible to suppress the deterioration of the cooling performance of the heat generating portion inside the projector main body 35.
(Intake / exhaust unit connection)
The connection between the intake unit 39 and the introduction cooling path 37 and the connection between the exhaust unit 40 and the outlet cooling path 38 will be described. In FIG. 4, a connection portion between the intake unit 39 and the introduction cooling passage 37 is shown, but the connection portion between the exhaust unit 40 and the outlet cooling passage 38 has the same structure.

  FIG. 4 is a cross-sectional view showing a cross section of a connection portion between the intake unit 39 and the introduction cooling path 37, and shows a state where the intake unit 39 and the introduction cooling path 37 are not connected. The inlet port 44 of the intake unit 39 has a circular hole shape, and an inlet claw portion 61 that protrudes in the center direction of the hole shape along the circumferential portion of the inlet port 44 at the lower end portion of the inlet port 44. Is formed.

  The introduction cooling path 37 is formed with a bowl-shaped taper portion 62 on the outer periphery of the tip connected to the introduction port 44, and U-shaped grooves 63 are formed at two positions on the tip of the introduction cooling path 37 with an interval of 180 degrees. Has been. A first O-ring 64 made of urethane or rubber is attached to the lower plane portion of the taper portion 62. At a position facing the first O-ring 64, a second O-ring 65 made of urethane or rubber is attached. The place where the second O-ring 65 is attached is a locking projection 66 provided on the circumference of the introduction cooling path 37.

  Further, the diameter of the outlet cooling passage 37 that is in contact with the inner peripheral surfaces of the first O-ring 64 and the second O-ring 65 substantially matches the inner diameter of the inlet claw portion 61 of the intake unit 39.

  FIG. 5 is a cross-sectional view showing a cross section of a connection portion between the intake unit 39 and the introduction cooling path 37, and shows a state where the intake unit 39 and the introduction cooling path 37 are connected. When the leading end of the introduction cooling path 37 is inserted into the introduction port 44 of the intake unit 39, the U-shaped groove 63 is deformed so that the introduction cooling path 37 is smoothly inserted into the introduction port 44, and the tapered portion 62 and the locking projection 66 are The introduction cooling claw 37 is not easily removed by fitting the introduction opening claw portion 61 therebetween. Further, if the connection is made as shown in FIG. 5, leakage of air sucked from the intake fan 43 by the first O-ring 64 and the second O-ring 65 can be prevented.

  By performing such a connection method, in addition to the operational effects of the overall configuration described above, the following operational effects are achieved.

  For example, when the obstacle 51 exists on the surface on which the intake fan 43 of the intake unit 39 is arranged as shown in FIG. 2, the intake by the intake fan 43 is hindered, and the cooling component is sufficiently prevented. Cooling cannot be performed. However, as shown in FIG. 6, the intake unit 39 can be rotated with respect to the introduction cooling path 37, and the intake fan 43 of the intake unit 39 can be installed in a desired direction. Thus, the intake unit 39 can be installed to perform a smooth intake.

  Further, the exhaust unit 40 can be rotated with respect to the outlet cooling path 38 by performing the same connection method for the exhaust unit 40. Therefore, since the exhaust fan 48 of the exhaust unit 40 can be installed in a desired direction, the exhaust unit 40 can be installed corresponding to the difference in installation environment, and smooth exhaust can be performed.

In FIG. 6, the intake unit 39 and the exhaust unit 40 are installed so that the intake direction of the intake unit 39 and the exhaust unit 40 differs from the exhaust direction by 180 degrees. The direction and the exhaust direction can be arbitrarily determined depending on the installation environment.
(Projector connection)
FIG. 7 is a perspective view of the projector main body 35 observed from above. A pair of side surfaces of the projector main body 35 has a cooling opening 71 having a diameter substantially the same as the diameter of the introduction cooling path 37 and the outlet cooling path 38. The inlet cooling path 37 and the outlet cooling path 38 are fixed to the cooling opening 71, and the dust contained in the inflowing air is not allowed to flow into the projector body 35 in the cooling opening 71 to which the introduction cooling path 37 is fixed. A filter 72 is provided. The exterior housing 73 of the projector main body 35 is formed so as to cover the projection optical system 11, an electronic circuit (not shown) that controls the projection optical system 11, a ballast circuit (not shown) that transforms the power supply voltage, and the like. The exterior casing 73 has a structure having no ventilation holes except for the cooling openings 71. Therefore, in this embodiment, a gap must be provided between the exterior casing 73 and the projection lens 26 because of the structure. However, a flexible sealing member (not shown) is disposed in the gap between the exterior casing 73 and the projection lens 26. Has been.

  The heat generating part is cooled by flowing cooling air from the introduction cooling path 37 into the projector main body 35. The cooling air that has cooled the heat generating portion is discharged from the outlet cooling path 38.

  By adopting a structure in which the exterior casing 73 does not have a ventilation hole, it is possible to make it difficult to transmit the wind noise of the cooling air flowing through the projector main body 35 to the outside.

Further, by adopting a structure in which the outer casing 73 does not have a ventilation hole, the pressure in the outer casing 73 can be increased, so that the cooling air can be easily guided to the outlet cooling path 38.
(Projection optics)
FIG. 8 is a diagram showing the projection optical system 11 built in the projector main body 35 of the present invention. The light source 12 includes an ultra-high pressure mercury lamp, a metal halide lamp, a xenon lamp, and the like, and the projection light is emitted as parallel light by the parabolic reflector 13 and guided to the integrator lens 14.

  The integrator lens 14 is composed of a pair of lens groups (fly eye lenses) 14a and 14b, and each lens portion guides light emitted from the light source 12 to the entire surface of a liquid crystal panel described later. 12 is averaged to reduce the difference in the amount of light between the center and the periphery of the screen. The light passing through the integrator lens 14 is guided to the first dichroic mirror 17 after passing through the polarizing plate 15 and the condenser lens 16.

  The polarizing plate 15 is configured by a polarizing beam splitter array (hereinafter referred to as a PBS array). The PBS array includes a polarization separation film and a phase difference plate (1 / 2λ plate). Each polarization separation film of the PBS array passes, for example, P-polarized light out of the light from the integrator lens 14 and changes the optical path of S-polarized light by 90 degrees. The S-polarized light whose optical path has been changed is reflected by the adjacent polarization separation film and emitted as it is. On the other hand, the P-polarized light transmitted through the polarization separation film is converted into S-polarized light by the retardation plate provided on the front side (light emitting side) and emitted. That is, in this case, almost all light is converted to S-polarized light.

  The first dichroic mirror 17 transmits light in the red wavelength band and reflects light in the cyan (green + blue) wavelength band. The light in the red wavelength band that has passed through the first dichroic mirror 17 is reflected by the total reflection mirror 18 to change the optical path. The red light reflected by the total reflection mirror 18 is guided to the transmissive liquid crystal panel 27 for red light through the lens 19 and is modulated by being transmitted therethrough. On the other hand, the light in the cyan wavelength band reflected by the first dichroic mirror 17 is guided to the second dichroic mirror 20.

  The second dichroic mirror 20 transmits light in the blue wavelength band and reflects light in the green wavelength band. The light in the green wavelength band reflected by the second dichroic mirror 20 is guided to the transmissive liquid crystal panel 28 for green light through the lens 21 and is modulated by being transmitted therethrough. In addition, the light in the blue wavelength band that has passed through the second dichroic mirror 20 is guided to the blue-light transmissive liquid crystal panel 29 through the total reflection mirror 22, the total reflection mirror 23, and the lens 24, and is transmitted therethrough. Is optically modulated.

  Each of the liquid crystal panels 27, 28, 29 has panel portions 27b, 28b formed by enclosing liquid crystals between the incident side polarizing plates 27a, 28a, 29a and a pair of glass substrates (with pixel electrodes and alignment films formed). , 29b and output side polarizing plates 27c, 28c, 29c.

  The modulated light (each color video light) modulated by passing through the liquid crystal panels 27, 28, 29 is synthesized by the cross dichroic prism 25 to become color video light. The color image light is enlarged and projected forward by the refractive optical system 26 and enlarged and projected by the reflecting mirror 30.

  As described above, the present embodiment is merely an example of the present invention. A person skilled in the art can naturally conceive that modes other than the present embodiment using the present invention can be considered. Therefore, it can be said that the embodiments described below are also embodiments using the present invention.

  In this embodiment, the intake fan 43 is arranged in the intake unit 39 and the exhaust fan 48 is arranged in the exhaust unit 40. However, the exhaust fan 40 is not arranged in the exhaust unit 40, but the outlet cooling path 38 is provided. It is assumed that the air inside the projector main body 35 may be discharged using a chimney effect utilizing the fact that it is arranged above the cooling opening.

  In addition, the present embodiment shows a projection display apparatus using a transmissive liquid crystal panel. However, the present invention is not limited to this, and the present invention is also applied to a projection display apparatus having another image light generation system. And a solid light source method using a solid light source such as a DMD (Digital Mirror Device) method, an LCOS (Liquid Crystal on Silicon) method, or a laser beam.

73 ... Exterior housing 39 ... Intake unit (cooling means)
40 ... Exhaust unit (cooling means)
37 ... Introduction cooling path (cooling path)
38 ... Derived cooling path (cooling path)
31 ... Projection display apparatus

Claims (3)

A heat generating part inside the exterior housing;
Cooling means for cooling the heat generating part, which is outside the outer casing,
A cooling path that can be flexibly deformed and connects the cooling means and the outer casing;
In a projection display apparatus comprising:
The cooling means has an intake unit and an exhaust unit,
The projection-type image display device, wherein the intake unit and the exhaust unit are configured separately.   2. The projection display apparatus according to claim 1, wherein the cooling unit and the cooling path are connected to the cooling path so that the cooling unit is rotatable. Display device. 2. The projection display apparatus according to claim 1, wherein a cooling path connected to the intake unit and the exhaust unit is connected to a facing surface of the exterior casing. .

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