WO2010116444A1 - 投写型表示装置 - Google Patents
投写型表示装置 Download PDFInfo
- Publication number
- WO2010116444A1 WO2010116444A1 PCT/JP2009/056467 JP2009056467W WO2010116444A1 WO 2010116444 A1 WO2010116444 A1 WO 2010116444A1 JP 2009056467 W JP2009056467 W JP 2009056467W WO 2010116444 A1 WO2010116444 A1 WO 2010116444A1
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- WIPO (PCT)
- Prior art keywords
- display device
- projection display
- air
- color wheel
- partition plate
- Prior art date
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- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03B—APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR
- G03B21/00—Projectors or projection-type viewers; Accessories therefor
- G03B21/14—Details
- G03B21/16—Cooling; Preventing overheating
Definitions
- the present invention relates to a projection display device having a dustproof structure that prevents dust from adhering to an optical component.
- Patent Document 1 Some conventional projection display devices obtain a dustproof effect by covering the entire device with a protective case (see, for example, Patent Document 1). In addition to focusing on specific parts mounted instead of the entire device, those that reduce dust adhesion to light tunnels and color wheels (Patent Document 2), and those that clean rod integrators contaminated by dust adhesion (Patent Document 3).
- Patent Document 1 The technique disclosed in Patent Document 1 is to protect the entire apparatus by a protective cabinet in which an air filter and an intake fan are mounted, and to prevent dust. Outside air is sucked in through an air filter by an intake fan, and after dust contained in the air is removed, it is sent to the entire apparatus. Since all the inhaled air passes through the air filter, the entire apparatus can be protected from dust.
- Patent Document 2 The technique disclosed in Patent Document 2 is to shield unnecessary light when light is incident on a light tunnel or a color wheel with a light shielding plate, and move heat stored by the light received by the light shielding plate to the outside of the mirror room to dissipate heat. .
- the temperature rise of the light tunnel, color wheel, and mirror room air can be suppressed, so that the internal airflow is reduced, and as a result, the adhering of floating dust is prevented.
- Patent Document 3 operates a cleaning pad by mechanical means, and physically cleans the exit surface of the rod integrator by the pad.
- Patent Document 1 Japanese Patent Application Laid-Open No. 2003-241310 (page 6, FIG. 1, page 7, FIG. 5)
- Patent Document 2 Japanese Patent Application Laid-Open No. 2002-318423 (page 11, FIG. 2)
- Patent Document 3 Japanese Patent Application Laid-Open No. 2005-292680 (Page 6, FIGS. 1 and 2)
- a fine air filter is required to remove even small particle size dust.
- fine air filters collect even medium and large particle sizes, so they are easily clogged and have high ventilation resistance.
- a large air filter is required because the area of the filter can be increased to reduce the ventilation resistance.
- this technique needs to increase the intake air volume in order to protect the entire apparatus from dust, and it is also necessary to use a plurality of large or medium-sized fans that can secure a large air volume.
- the air filter may become clogged when installed in a poor dust environment.
- the air filter is clogged, sufficient cooling air cannot be sent to the components in the apparatus, the temperature of the components rises, and the life of the components is shortened.
- many optical components are sensitive to temperature, and are significantly deteriorated due to the temperature rise, resulting in uneven color and reduced brightness in the projected image.
- the protective cabinet that surrounds the entire device is large and heavy, and high airtightness is required to prevent inhalation from other than the air filter. There is also a risk of clogging the air filter in a poor dust environment.
- Patent Document 2 does not function when there is no dust in the vicinity of the light tunnel or the color wheel, and when dust is present, adhesion can be reduced but cannot be completely prevented. Further, since light other than unnecessary light enters an optical component such as a light tunnel or a color wheel, the temperature rise of the component due to this light cannot be reduced. In fact, the required temperature other than unnecessary light contributes more to the temperature rise of these optical components. Therefore, if the internal air flow is reduced, the temperature rises greatly, which may lead to deterioration or destruction of the optical components.
- Patent Document 3 since the technique disclosed in Patent Document 3 is to clean the rod integrator by bringing a cleaning pad into contact with the exit surface, the exit surface may be damaged when the cleaning pad wipes off dust. In particular, it tends to occur when the dust is a dust-based system, and when scratches are present, there is a problem that the brightness is greatly reduced because light diffuses. In addition, a space for mounting the mechanical means for operating the cleaning pad is required, and since there are a plurality of operating parts, the probability of failure is high.
- An example of an object of the present invention is to provide a projection display device that can solve the problems of the background art.
- One embodiment of the present invention is a projection display device including a plurality of optical components, a structure, and a blower source.
- a part of the plurality of optical components is hermetically housed in the structure, and the air source circulates the gas inside the structure.
- the heat exchanger, the duct and the optical engine cover are shown removed, and the optical engine base is not shown.
- the schematic diagram of the 4th Example of this invention The schematic diagram of the 5th Example of this invention.
- the schematic diagram of the 6th Example of this invention The schematic diagram of the 7th Example of this invention.
- the schematic diagram of the 8th Example of this invention The schematic diagram of the 9th Example of this invention.
- the schematic diagram of the 10th Example of this invention The schematic diagram of the 11th Example of this invention.
- the schematic diagram of the 12th Example of this invention The schematic diagram of the 13th Example of this invention.
- the words “upper” and “lower” mean “upper” and “lower” in the normal installation posture of the projection display device (for example, the installation posture on a table such as a desk). Further, the terms “left” and “right” mean “left” and “right” in the above “up” and “down” directions.
- FIG. 1 is a perspective view showing a projection display device according to an embodiment of the present invention in an exploded state.
- the display device of this embodiment includes an upper casing 1 and a lower casing 2 having a concave shape, and a power supply unit 4, a main board 5, a lamp in a space formed by combining the upper casing 1 and the lower casing 2.
- the unit 6, the optical engine 7, the projection lens 8, the DMD unit 9, the sirocco fan 10, the duct 11, and the like are accommodated.
- 1 shows a display device in which the upper housing 1 and the main board 5 are removed in the upper direction.
- the emitted light is emitted into the optical engine 7 and irradiated onto the image generating element DMD in the DMD unit 9 through a plurality of optical components mounted inside the optical engine.
- the DMD is driven according to a video signal input from the outside of the apparatus, and generates an image by reflecting the irradiated light.
- the generated image is enlarged by the projection lens 8 and projected onto the screen.
- the display device of the present embodiment uses DMD (Digital Micromirror Device) as the image generation means, but is not limited to this, and a liquid crystal light valve may be used.
- DMD Digital Micromirror Device
- the deterioration of the components is accelerated, leading to performance degradation and destruction. Therefore, it is necessary to suppress the temperature rise of the components, and the display device of this embodiment is air-cooled by a cooling fan.
- a sirocco fan 10 for cooling the lamp and an exhaust fan (not shown) are mounted inside the display device. Cooling air generated by the sirocco fan 10 is supplied to the lamp unit 6 through the duct 11.
- the exhaust fan is mounted behind the left side surface of the apparatus, and exhausts air after cooling the mounted components to the outside of the apparatus. As shown in FIG. 1, the upper housing 1 is provided with an intake opening 3 for taking in cooling air from the outside.
- FIG. 2 is an enlarged perspective view of the optical engine 7 and its peripheral portion of the display device of this embodiment.
- the state where the upper cover of the duct 11 is removed is shown, and the flow of cooling air sent from the sirocco fan 10 to the lamp unit 6 is shown by a dotted line.
- the optical engine 7 a plurality of optical components through which light from the lamp unit 6 passes are attached to the optical engine base 13, and are covered with an optical engine cover 14 from above. Further, the heat exchanger 12 takes heat from the air that has risen in temperature in the optical engine 7, and the heat is radiated by the cooling air passing through the duct 11. The cooling air flows directly to the lamp unit 6 and is used for cooling the lamp.
- FIG. 3 shows a state in which the heat exchanger 12, the duct 11, and the optical engine cover 14 are removed, and the optical engine base 13 is not shown.
- a plurality of optical components mounted in the optical engine 7 will be described with reference to FIG.
- the light emitted from the lamp unit 6 is incident on a glass plate 30 having an AR coating (Anti Reflection Coating) on its surface. Then, the light passes through the color wheel 24 as an optical filter divided into a plurality of colors, and then enters the light tunnel 20 that is a rod integrator. In the light tunnel 20, light entering from one end repeats a plurality of reflections on the inner wall surface and exits from the other end. The light exiting the light tunnel 20 passes through the condenser lenses 21 and 22, is reflected by the mirror 23, and is irradiated on the DMD in the DMD unit 9. At this time, the rotation of the color wheel 24 and the operation of the DMD are controlled in conjunction with each other, and a time-division video is generated. Among these optical components, the color wheel 24 and the light tunnel 20 are the main objects of dust prevention of the present invention.
- FIGS. 4 and 5 are perspective views showing the optical components from the glass plate 30 to the condenser lens 21 mounted in the optical engine 7 from the glass plate 30 side, and the optical components on the condenser lens 12 side. It is the perspective view shown from.
- the glass plate 30, the color wheel 24, the light tunnel 20, and the condenser lens 21 are sequentially arranged in this order from the light incident side.
- the glass plate 30 is fixed and held on the optical engine base 13.
- the condenser lens 21 is fixed to a condenser lens mounting plate 33.
- the condenser lens mounting plate 33 is attached to the optical engine base 13 so that the condenser lens 21 can be adjusted to the left and right.
- the gap between the condenser lens mounting plate 33 and the optical engine base 13 was configured to be substantially free of gaps by alternately interpolating with ribs (not shown) extending from the side surfaces of the optical engine base 13. However, it is possible to completely fill the gap with a heat-resistant sponge or the like by replacing the rib.
- a partition plate 32 that partitions the sealed space on the color wheel 24 side and the sealed region on the condenser lens 21 side is attached to the optical engine base 13.
- the light tunnel 20 is attached to a light tunnel adjustment base 31 and is held so that the vertical and horizontal positions can be adjusted.
- the partition plate 32 is opened so that the light tunnel 20 passes through the plate.
- the partition plate 32 is held by the sirocco fan 19.
- the partition plate 32 includes an air inlet 42 through which the sirocco fan 19 inhales the air in the sealed space on the color wheel 24 side, and the exhausted air from the sealed region on the condenser lens 21 side to the color wheel 24 side. Ventilation holes 34 for moving into the sealed space are provided.
- the color wheel 24 is attached to the color wheel motor 35 and rotates at high speed around the color wheel motor shaft 36 in conjunction with the DMD.
- the sirocco fan 19 blows the sucked air toward the light tunnel 20.
- 6 and 7 are an enlarged perspective view and a top view of optical components from the glass plate 30 to which the light emitted from the lamp unit 6 first enters the condenser lens 21 in the optical engine 7 shown in FIG. It is.
- the area from the plate-like structure holding the glass plate 30 (the right end of A in FIGS. 5 and 6) to the condenser lens mounting plate 33 (the left end of B in FIGS. 5 and 6) is a sealed space.
- the interior is partitioned by a partition plate 32 penetrating the light tunnel 20. (It is divided into areas surrounded by dotted lines in FIG. 7.) That is, both the color wheel 24 and the light tunnel 20, the exit side surface of the glass plate 30, and the entrance side surface of the condenser lens 21 are dustproof.
- the purpose is to protect the entire color wheel 24 and the light tunnel 20, but if they are shielded by a structure, the light is blocked. Therefore, the color wheel 24 and the light tunnel 20 are shielded entirely while allowing light to pass through by using the glass plate 30 and the condenser lens 21 in a part of the blocking wall.
- a sirocco fan 19 for circulating the air in the sealed space is attached to the partition plate 32.
- FIG. 8 is a perspective view showing the optical engine 7 cut along the section CC ′ of FIG.
- Light incident on the glass plate 30 around the optical axis 37 passes through the color wheel 24 that is driven to rotate at high speed by the color wheel motor 35 in conjunction with the DMD, and then enters the light tunnel 20.
- the light tunnel 20 is held by a light tunnel adjustment stand 31 and fixed to the bottom of the optical engine base 13 so as to be adjustable in the left-right direction.
- incident light is made uniform by repeating internal reflection a plurality of times.
- the homogenized light enters the condenser lens 21 and exits to the condenser lens 22 after exiting.
- a plate-shaped shielding structure is used to surround them, and a box (top cover) is covered from above the box-shaped space.
- the casing is made dust-proof by creating an almost completely enclosed space.
- the plate-shaped shielding structure forms a wall surface 50 of the optical engine base 13 that is substantially perpendicular to the optical axis 37, a wall surface 51 that is the bottom of the optical engine base 13, and a surface that is substantially perpendicular to the optical axis 37.
- the wall surface 52 of the condenser lens mounting plate 33, the two wall surfaces 53 and 54 (not shown for cross section) of the optical engine base 13 facing each other, the duct 11 and the upper cover of the color wheel 24 (optical engine cover) 14 is a wall surface 55.
- the glass plate 30 constitutes a part of the wall surface 50
- the condenser lens 21 constitutes a part of the wall surface 52. The reason why the glass plate 30 and the condenser lens 21 constitute a part of the wall surface is to allow light around the optical axis 37 to pass through without loss.
- the light emitting side surface of the glass plate 30 and the light incident side surface of the condenser lens 21 are inside the sealed space and are dust-proof.
- This sealed space is roughly divided into two regions by a partition plate 32 to which the sirocco fan 19 is attached.
- the heat exchanger 12 made of aluminum is provided on the wall surface 55 constituting the duct 11 with a fin-shaped heat sink on the top and bottom.
- the heat exchanger 12 absorbs the heat of the air whose temperature has risen in the sealed space by the lower fin-shaped portion, and dissipates the heat from the upper fin-shaped portion by heat transfer.
- the upper fin-shaped portion is in a flow path surrounded by the duct 11 and the duct cover 38, and is cooled by the air sent from the sirocco fan 19 to the lamp unit 6 to dissipate heat.
- FIG. 9 is a simplified view of the perspective view of FIG. The flow of the cooling air in the sealed structure will be described with reference to this figure.
- parts such as the light tunnel adjusting table 31 that are not directly related to cooling are omitted. That is, only the heat generating components and the structural members directly related to dust prevention and cooling are shown.
- the dust-proof targets are the color wheel 24, the color wheel motor 35 and the color wheel motor shaft 36 that is the motor shaft, the entire light tunnel 20, the light emission side of the glass plate 30, and the light incidence side of the condenser lens 21. It is. Further, the entire sirocco fan 19 attached to the partition plate 32 that divides the internal sealed space into two regions is also dust-proof. These parts all increase in temperature due to self-heating and light absorption, and the temperature increase is large in the light tunnel 20, the color wheel 24, the color wheel motor 35 and the color wheel motor shaft 36. In the present embodiment, cooling of the light tunnel 20 is given top priority, and cooling air is efficiently circulated in order to cool all these components.
- the exhaust air from the sirocco fan 19 is blown directly onto the light tunnel 20 to stir the entire air in the sealed space B.
- heat dissipation from the shielding wall surfaces 51, 52, 53, 54, and 55 and heat transfer to the fin shape at the bottom of the heat exchanger 12 are promoted.
- the heat exchanger 12 heats the heat absorbed from the lower fin shape to the upper fin shape, and is cooled and radiated by the air flowing through the flow path constituted by the duct 11 and the duct cover 37.
- the air stirred in the sealed space B passes through the inside of the light tunnel 20 and moves into the sealed space A. At this time, the inner wall of the light tunnel 20 is cooled, and the wind whose wind speed is increased is ejected toward the color wheel 20 and is blown onto the light condensing portion of the color wheel 20 to be cooled.
- the cooling air that has been blown and changed direction is dispersed toward the surroundings and agitates the air in the sealed space B.
- the color wheel motor 35 and the color wheel motor shaft 36 are cooled by the diffused air.
- the cooling air in the sealed space A passes through the air inlet 42 provided in the partition plate 32 and is sucked into the sirocco fan 19 and blown again to the light tunnel 20.
- the heat radiation in the upper fin shape of the heat exchanger 12 uses the air flowing through the flow path composed of the duct 11 and the duct cover 37.
- the upper fin shape is provided outside the duct and is used in the apparatus. You may dissipate heat.
- the lower fin shape of the heat exchanger 12 is provided only in the sealed space B, it may be extended in the right direction and provided in the sealed space A. When the lower fin shape is provided in both the sealed space A and B, the heat exchange capability further increases.
- the heat exchanger 12 may not be provided, and the heat radiation may be performed only with the shielding wall surface (for example, the wall surfaces 54, 54, 55, etc.) forming the sealed space.
- FIG. 10 is a schematic diagram of the second embodiment of the present invention. This is an example in which the internal structure is changed with respect to the first embodiment (particularly, the cross-sectional view of FIG. 9).
- the heat exchanger 12 is not provided, and the heat of the air in the sealed space is radiated out of the sealed space only by heat radiation from the shielding wall surface.
- the point that the cooling air is blown to the light tunnel 20 by the sirocco fan 19 is the same as that of the first embodiment.
- the cooling air after blowing is partially passed through the inside of the light tunnel 20, and the others are on the upper part. It moves to the sealed space A through the provided ventilation hole 41 and the opening (ventilation gap) 43.
- the diameter of the ventilation hole 41 and the gap between the peripheral end surface of the opening 43 and the outer surface of the light tunnel 20 are small, and as a result, the cooling air whose wind speed is increased blows to the surface of the color wheel 24.
- FIG. 11 is a schematic diagram of the third embodiment of the present invention. This is an embodiment in which the internal structure is changed with respect to the first embodiment (particularly, the cross-sectional view of FIG. 9).
- the heat exchanger 12 is not provided, and the heat of the air in the sealed space is radiated out of the sealed space only by heat radiation from the shielding wall surface.
- the overall flow of the cooling air in the sealed space is almost the same as that of the first embodiment, but in this embodiment, the ventilation hole 41 and the opening 43 as shown in FIG.
- the top priority is cooling the central motor shaft. That is, all of the cooling air blown to the light tunnel 20 by the sirocco fan 19 passes through the inside of the light tunnel 20 and first blows to the motor shaft at the center of the color wheel 24 in the sealed space A.
- FIG. 12 is a schematic diagram of the fourth embodiment of the present invention.
- the flow of the cooling air in the sealed space is almost the same as in the third embodiment, except that an axial fan 46 is used as the cooling fan. That is, in the present embodiment, the circulation air volume between the sealed spaces A and B is increased by increasing the wind speed of the wind blown to the light tunnel 24 using the axial fan 46. Increasing the circulating air volume can suppress the temperature rise of the entire components.
- FIG. 13 is a schematic diagram of the fifth embodiment of the present invention.
- the light tunnel 24 is preferentially cooled, but in this embodiment, the cooling of the color wheel motor shaft is given the highest priority.
- an axial fan 46 is arranged above the optical axis 37 of the sealed space B, and the exhaust port of the axial fan 46 and the ventilation hole 41 provided in the partition plate 44 are the motor shaft of the color wheel 24. 36 in the vicinity.
- the air flow from the axial fan 46 is directly blown to the motor shaft 36 and the color wheel motor 35 of the color wheel 24. Since the color wheel motor rotates at a high speed around 8000 rpm, the bearing becomes hot. By cooling this bearing, the component life of the color wheel motor 35 can be extended.
- the cooling air blown to the motor shaft 36 and the color wheel motor 35 circulates clockwise in the sealed space A, passes through the inside of the light tunnel 20, and again enters the sealed space B on the intake port side of the axial fan 46. Moving. In this way, the light tunnel 20 is also cooled.
- FIG. 14 is a schematic diagram of the sixth embodiment of the present invention.
- an aluminum heat exchanger 60 is provided on the upper portion of the casing 45 of the third embodiment shown in FIG.
- the heat exchanger 60 has a fin shape in the inner space A, B inside the casing 45 and can efficiently dissipate heat of the air in the sealed spaces A, B to the outside.
- FIG. 15 is a schematic diagram of the seventh embodiment of the present invention.
- an aluminum heat exchanger 60 is provided on the upper portion of the casing 45 of the third embodiment shown in FIG. 11, but compared with the sixth embodiment, the radiating fins of the heat exchanger are provided. , Only in the sealed space B. Although the heat exchange performance of the sixth embodiment is better, the space for accommodating the color wheel is wider than that of the sixth embodiment because no heat radiating fins are provided in the sealed space A.
- FIG. 16 is a schematic diagram of an eighth embodiment of the present invention.
- the heat exchanger 61 of the seventh embodiment shown in FIG. 15 is divided into two parts, and is provided in a heat sink 62 provided outside the upper portion of the casing 45 and a sealed region B of the casing 45.
- the heat sink 63 is used.
- an opening through which the heat dissipating structure (heat dissipating fin) on the lower side of the heat exchanger 61 is formed in the upper wall of the casing 45.
- the casing 45 of the present embodiment is in a sealed state.
- the internal parts are assembled in advance in a clean environment and sealed with the casing 45. Thereafter, the heat engine 62 is attached after the optical engine is incorporated into the apparatus. Since there is a wall of the casing 45 between the heat sink 63 and the heat sink 62, the heat exchange rate between the inside and outside of the sealed space is lower than that of the seventh embodiment, but there is an advantage that dust or the like is difficult to enter during manufacture. is there.
- FIG. 17 is a schematic diagram of the ninth embodiment.
- an aluminum heat sink 62 is provided only outside the casing 45 of the third embodiment shown in FIG.
- the heat exchanging performance is lower than any of the sixth to eighth embodiments described above, this embodiment can be provided with a heat sink retrofitted as required.
- FIG. 18 is a schematic diagram of the tenth embodiment of the present invention.
- the opening 43 of the partition plate 44 provided for penetrating the light tunnel 20 is secured in the third embodiment shown in FIG. Thereby, the cooling air passes from the internal space B to the internal space A along the outer wall of the light tunnel 20.
- the cooling air that has passed through the opening 43, together with the cooling air that has passed through the inside of the light tunnel 20, is blown around the color wheel 24 together around the periphery.
- the cooling air is not positively blown to the outer wall of the light tunnel 20 on the sealed area A side, but in this embodiment, it blows and contributes to the cooling of the color wheel 24. .
- FIG. 19 is a schematic view of an eleventh embodiment of the present invention.
- This embodiment is the same as the third embodiment shown in FIG. 11 except that a ventilation hole 41 is provided in the upper part of the partition plate 44 inside the casing 45.
- the ventilation hole 41 sandwiches the light tunnel 20 and is a sirocco fan. It is provided at a position facing the 19 intake ports 42.
- the opening 43 as a ventilation gap is not provided as in the tenth embodiment.
- the present embodiment does not actively flow cooling air into the inside of the light tunnel 20 but guides a flow of air circulating widely in the sealed space to cool the entire color wheel 24 and the light tunnel 20. That is, the cooling air blown from the exhaust port of the sirocco fan 19 cools the outer wall of the light tunnel 20 and then moves from the upper part of the sealed space B to the sealed space A through the ventilation holes 41. In the sealed space A, the cooling air cools the color wheel 20 and the color wheel motor 35 in the flow from the upper part to the lower part of the sealed space A, and then is sucked into the sirocco fan 19 through the ventilation holes 42 and again. It is blown out from the exhaust port.
- FIG. 20 is a schematic diagram of a twelfth embodiment of the present invention.
- a ventilation hole 41 is provided in the lower part of the partition plate 44 inside the casing 45, and in particular, the ventilation hole 41 has an axial flow across the light tunnel 20.
- the fan 46 is provided at a position facing the exhaust port 42.
- This embodiment does not actively flow cooling air into the inside of the light tunnel 20, but, like the eleventh embodiment shown in FIG. 19, guides the flow of wind that circulates widely in the enclosed space, and the color wheel. 24 and the entire light tunnel 20 are cooled.
- the cooling air blown from the exhaust port 42 of the axial fan 46 cools the color wheel motor shaft 36 and the color wheel motor 35, and then cools the color wheel 24 in a flow from the upper part to the lower part in the sealed space A. To do. Thereafter, the cooling air moves from the lower part of the sealed space A to the sealed space B through the ventilation holes 41 provided in the lower part of the sealed space A. In the sealed space B, the light tunnel 20 is cooled in the flow of the cooling air from the lower part to the upper part, is sucked from the intake port of the axial fan 46, and the cooling air is blown out from the exhaust port of the axial fan 46 again.
- FIG. 21 is a schematic diagram of a thirteenth embodiment of the present invention.
- the heat exchanger in this embodiment is the same as that in the sixth embodiment shown in FIG. 14, but the flow of cooling air in the sealed space is different from that in the sixth embodiment.
- the flow of the cooling air in the sealed space is a flow that can cool the outer wall of the light tunnel 20 by enlarging the opening 43 as in the second embodiment (FIG. 10) and the tenth embodiment (FIG. 18). .
- a ventilation hole 41 for creating a flow of cooling air is provided near the lower fin-shaped portion of the heat exchanger 60. With this opening, a flow from the sealed space B to the sealed space A occurs, the lower fin-shaped portion of the heat exchanger 60 is cooled, and heat transfer to the outside of the casing 45 is promoted.
- FIG. 22 is a schematic diagram of a fourteenth embodiment of the present invention.
- the upper part of the heat exchanger 60 and the casing 45 is integrally formed by aluminum die casting in the thirteenth embodiment.
- the heat exchanger 60 is integrated with the upper part of the casing 45, the heat radiation area is enlarged and the heat radiation amount is increased. Further, in order to make it easier for the air flow in the sealed space to move from the sealed space B to the sealed space A in the upper part of the sealed space, the ventilation hole 41 is further enlarged.
- the color wheel is disposed on the light source side and the light tunnel is disposed on the projection lens side, but the present invention is not limited to this arrangement. That is, in the present invention, the light source side may be a light tunnel and the projection lens side may be a color wheel, and the same effect can be obtained even if other optical components are arranged between them.
- the display device of the embodiment as described above can shield the color filter and the rod integrator from the surrounding space with a plate-like or box-shaped structure to form a sealed space and prevent dust from adhering.
- the space where the color filter and the rod integrator are arranged is a sealed space, there is no dust entry from the outside, and dust adhesion can be reliably prevented.
- the color filter and the rod integrator rise in temperature due to this sealing, they are cooled by the internal division by the partition plate provided in the space and the efficient circulation of the internal air by the cooling fan. At this time, the temperature of the internal air rises due to the heat taken from the color filter, rod integrator, etc., but the heat storage of the internal air is performed via a plate-like or box-shaped structure or heat exchanger that forms the sealed space. It moves to space and dissipates heat.
- the sealed space formed of a plate-like or box-shaped structure has a sound insulation effect, there is almost no noise leaking to the surroundings even if the cooling fan is rotated at high speed in the sealed space. For this reason, it is possible to cool the color filter, the rod integrator and the like by vigorously stirring the internal air.
- the display device of the above embodiment does not require an air filter, there is no risk of clogging, and there is no cleaning or replacement of the air filter.
- a light tunnel which is a hollow rod integrator, is cited as one of the optical components used in the display device.
- a solid rod lens can be used in the configuration in which the opening of the partition plate through the rod integrator of the partition plate is enlarged to form a ventilation gap.
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Abstract
Description
[特許文献2]特開2002-318423号公報(第11頁、図2)
[特許文献3]特開2005-292680号公報(第6頁、図1、図2)
しかしながら、特許文献1に開示された技術ではエアフィルタを用いるが、小粒径の粉塵まで除去するためには目の細かいエアフィルタが必要となる。しかし、目の細かいエアフィルタは中粒径や大粒径のものまで捕集してしまうため、目が詰まり易く通風抵抗が高い。通風抵抗を軽減するにはフィルタの面積を拡大すれば良いため、大型のエアフィルタが必要となる。また、この技術は装置全体を防塵するため吸気風量を大きくする必要があり、大風量を確保できる大型のファンもしくは中型ファンを複数用いる必要もある。
2 底部筐体
3 吸気開口部
4 電源ユニット
5 メイン基板
6 ランプユニット
7 光学エンジン
8 投写レンズ
10 シロッコファン
11 ダクト
12 熱交換器
13 光学エンジンベース
14 光学エンジンカバー
19 シロッコファン
20 ライトトンネル
21,22 コンデンサーレンズ
23 ミラー
24 カラーホイール
30 ガラス板
31 ライトトンネル調整台
32 仕切り板
33 コンデンサーレンズ取り付け板
34 通風口
35 カラーホイールモータ
36 カラーホイールモータ軸
37 ダクトカバー
37 光軸
50,51,52,53,54,55 壁面
41,42 通風口
43 開口(通風隙間)
44 仕切り板
45 ケーシング
46 軸流ファン
60,61 熱交換器A
62,63,65 ヒートシンク(放熱フィン)
図1は本発明の一実施例の投写型表示装置を分解状態で示した斜視図である。本実施例の表示装置は、凹形状を有する上部筐体1および下部筐体2を備え、上部筐体1と下部筐体2を組み合わせてできる空間内に、電源ユニット4、メイン基板5、ランプユニット6、光学エンジン7、投写レンズ8、DMDユニット9、シロッコファン10、ダクト11などを収めている。なお、図1では上部筐体1とメイン基板5が上部方向に取り外された表示装置が示されている。
すなわち、カラーホイール24とライトトンネル20の両方と、ガラス板30の出射側表面とコンデンサーレンズ21の入射側表面が防塵される。
図10は、本発明の第2の実施例の模式図である。これは、第1の実施例(特に図9の断面図)に対し、内部構造を変更した例である。
図11は、本発明の第3の実施例の模式図である。これは、第1の実施例(特に図9の断面図)に対し、内部構造を変更した実施例である。
図12は、本発明の第4の実施例の模式図である。
図13は、本発明の第5の実施例の模式図である。第1ないし第4の実施例はライトトンネル24を優先して冷却したものであるが、本実施例は、カラーホイールモータ軸の冷却を最優先したものである。
図14は、本発明の第6の実施例の模式図である。
図15は、本発明の第7の実施例の模式図である。
図16は、本発明の第8の実施例の模式図である。
図17は、第9の実施例の模式図である。本実施例は、図17に示す第3の実施例のケーシング45の外側のみにアルミ製のヒートシンク62を設けたものである。熱交換の性能は前述した第6ないし8の実施例のどれよりも低くなるが、本実施例はヒートシンクを後付けで、必要に応じて設けることができる。
図18は、本発明の第10の実施例の模式図である。
図19は、本発明の第11の実施例の模式図である。
図20は、本発明の第12の実施例の模式図である。
図21は、本発明の第13の実施例の模式図である。
図22は、本発明の第14の実施例の模式図である。
Claims (11)
- 複数の光学部品と、
前記複数の光学部品のうちの一部を密閉収容する構造体と、
前記構造体の内部の気体を循環させる送風源と、
を備えた投写型表示装置。 - 前記複数の光学部品が順に配置されており、
前記光学部品の配置方向にある前記構造体の壁の一部分が、光を透過する部材で構成されていることを特徴とする請求範囲第1項に記載の投写型表示装置。 - 少なくとも第1の開口と第2の開口を有する仕切り板であって、前記構造体で形成される密閉空間を複数の空間に仕切る仕切り板を、さらに備え、
前記一部の光学部品は、ロッドインテグレータ、および、回転駆動軸に支持されたカラーホイールであり、
前記回転駆動軸に支持されたカラーホイールは前記複数の空間の一つに配置され、前記ロッドインテグレータは、前記仕切り板の前記第1の開口を貫通して前記複数の空間に跨って配置されていることを特徴とする請求範囲第1項または第2項に記載の投写型表示装置。 - 前記ロッドインテグレータの外面と前記第1の開口の周縁面との間に、通気可能な隙間を有することを特徴とする請求範囲第3項に記載の投写型表示装置。
- 前記送風源が前記仕切り板に取り付けられており、
前記送風源の吸気口と、前記仕切り板の前記第2の開口とが連通していることを特徴とする請求範囲第3項または第4項に記載の投写型表示装置。 - 前記送風源の吹出し口が前記ロッドインテグレータの外面に向けて配置されていることを特徴とする請求範囲第5項に記載の投写型表示装置。
- 前記送風源が前記仕切り板に取り付けられており、
前記送風源の吹出し口と、前記仕切り板の前記第2の開口とが連通していることを特徴とする請求範囲第3項または第4項に記載の投写型表示装置。 - 前記送風源の吹出し口が前記カラーホイールの前記回転駆動軸に向けて配置されていることを特徴とする請求範囲第7項に記載の投写型表示装置。
- 前記仕切り板は、前記第1の開口を挟んで前記第2の開口とは反対側の位置に第3の開口をさらに有することを特徴とする請求範囲第3項から第8項のいずれかに記載の投写型表示装置。
- 前記ロッドインテグレータがライトトンネルであることを特徴とする請求範囲第3項から第9項のいずれかに記載の投写型表示装置。
- 前記構造体の壁に熱交換器を有することを特徴とする請求範囲第1項から第10項のいずれかに記載の投写型表示装置。
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US13/138,727 US8678597B2 (en) | 2009-03-30 | 2009-03-30 | Projection type display device |
PCT/JP2009/056467 WO2010116444A1 (ja) | 2009-03-30 | 2009-03-30 | 投写型表示装置 |
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JPWO2010116444A1 (ja) | 2012-10-11 |
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