JP5369559B2 - Projection display - Google Patents

Description

  The present invention relates to a projection display device such as a projector provided with a cooling device for cooling a light emitter of a light source. Specifically, even in a projection display device installed in various postures, a high temperature portion of a light source lamp is always provided. The present invention relates to a projection display device that can be cooled.

  2. Description of the Related Art Conventionally, a projection display device such as a projector includes a light source lamp that emits light for projecting and displaying an image displayed on a display device such as a liquid crystal panel. In addition, a metal halide or the like is enclosed.

  In such a projection display device, when a predetermined voltage is applied to the electrode of the light source lamp, a discharge arc is generated and the gas enclosed inside starts to convect.

  The discharge arc caused by this convection becomes a mountain arch, approaches the upper part of the light source lamp, and the temperature of the upper part of the light source lamp increases.

  If the temperature of the light source lamp rises too much, problems such as whitening, a decrease in service life and explosion may occur. On the other hand, if the temperature of the light source lamp is too low, problems such as blackening and a decrease in luminance of the light source occur.

  For this reason, various methods for more efficiently cooling the upper part of the light source lamp have been considered. Usually, cooling air is blown toward the upper part of the light source lamp.

  However, the vertical direction of the light source lamp is reversed between when the projection display device is used on the floor and when the projection display device is attached to the ceiling.

  Therefore, even if a structure that efficiently cools the upper part of the light source lamp is provided, if the vertical direction of the projection display device is reversed depending on the installation posture, the lower side of the light source lamp is preferentially cooled. The temperature of the light source lamp is too low.

  Furthermore, when the projector is used in a posture that projects vertically upward or downward, or in an intermediate position between them, similarly, the portion other than the upper portion of the light source lamp is cooled too much, resulting in blackening and a decrease in luminance of the light source. End up.

  In such a case, the upper part that requires cooling is conversely insufficiently cooled, and the cooling is strengthened, so that the above phenomenon is further deteriorated.

In order to solve this problem, as disclosed in Patent Documents 1 to 3, the upper portion of the light source lamp can be efficiently cooled by changing the angle of the air guide plate according to the installation posture of the apparatus, A method of selecting a flow path in accordance with the installation posture is considered.
JP 2002-298639 A JP 2005-24735 A JP 2007-78736 A

  In the light source device of Patent Document 1, a wind direction control plate that sends more outside air to the upper or lower part of the light source is provided near the side surface of the concave mirror front opening, and the upper part of the light source is cooled even when the projection display device is turned upside down. I can do it.

  However, since the wind is sent from the side direction, even if the upper and lower temperatures of the light source lamp are optimized, the left and right temperatures may be higher or lower than the upper and lower temperatures.

  Further, in the light source device of Patent Document 2, cooling air introduction openings are provided on the upper and lower surfaces of the concave mirror, cooling air passages are connected to the respective cooling air introduction openings, and the cooling air passage moves up and down by its own weight. A shutter is provided.

  However, it is necessary to form flow paths for cooling the light source at two locations above and below the concave mirror, which increases the size of the apparatus.

  In both Patent Documents 1 and 2, when the projection display device is turned upside down, the projection display device is projected vertically upward or vertically even if the temperature of the upper part of the light source lamp is optimized. Cannot cool the top of the light source lamp.

  Further, in the projector device of Patent Document 3, two air inlets for introducing cooling air toward the light source lamp are provided on both sides across a plane that includes the central axis of the light source lamp and is orthogonal to the concave mirror side wall. Yes.

  However, since cooling air is blown from one direction, the left and right temperatures of the light source lamp may be higher or lower than the upper and lower temperatures. doing.

  Therefore, the present invention has been made to solve such problems, and with a simple configuration, the upper part of the light source lamp can be efficiently cooled regardless of the installation posture, and the lower part of the light source lamp can be cooled. An object of the present invention is to provide a projection display device that can prevent overcooling of the light source lamp and can optimally cool the left and right temperatures of the light source lamp.

In order to solve the above-described problems, a projection display device according to the present invention includes a light source lamp that emits light, a substantially cylindrical concave mirror that reflects light emitted from the light source lamp with the optical axis of the light source lamp as a central axis, and A transparent member that covers the opening of the concave mirror, a blower opening provided between the concave mirror or the concave mirror and the transparent member, a display device that displays an image with light emitted from the light source lamp, and a display device In a projection display device comprising a projection lens for projecting an image,
The air blowing port is formed in at least two locations, and a flow path for guiding cooling air is connected to the air blowing port, and the flow channel is branched to guide the cooling air to at least two air blowing ports. In addition, a valve that rotates by gravity and communicates cooling air to one of the air outlets is arranged at the branch point, and the air outlet has a rotation axis located in the projection space of the concave mirror opening, A wind guide plate that rotates due to gravity and changes the direction of the cooling air is arranged, and the air blowing port is formed so as to be located above, below, or on the side of the light source lamp depending on the installation posture of the projection display device. And the valve rotates so that the cooling air is guided to the air outlet located above or below the light source lamp, and further, when the cooling air is guided from the air outlet located above the light source lamp. The cooling air is directed toward the top of the light source lamp in an oblique direction The baffle plates as blown directly bought rotates, when the cooling air is guided from the air inlet located below the light source lamp cooling air along the shape of the upper concave mirror indirectly source lamp The air guide plate is configured to rotate so as to be sprayed toward the upper portion of the.

  The present invention has a simple configuration of a rotatable valve provided in the flow path and a rotatable air guide plate provided at two air outlets, regardless of the installation posture of the projection display device. The upper part of the light source lamp can be efficiently cooled, the under-cooling of the lower side of the light source lamp can be prevented, and the left and right temperatures of the light source lamp can be optimally cooled. It is possible to obtain excellent effects such as prevention of lowering and rupture, and prevention of blackening and luminance reduction of the light source.

  In addition, since it can be cooled with a single fan regardless of the installation posture, the projection display device can be downsized, the cost can be reduced, and moreover, it can be cooled efficiently, so that noise can be reduced. Effect.

  Hereinafter, embodiments of the present invention will be described with reference to FIGS.

(Embodiment 1)
1A and 1B show a schematic configuration of a light source unit incorporated in a projection display apparatus according to Embodiment 1 of the present invention. FIG. 1A is a cross-sectional perspective view, and FIG. 1B is a cross-section of an air guide unit. FIG.1 (c) is operation | movement explanatory drawing of a baffle plate. 2 to 5 are diagrams showing the relationship between the installation posture of the projection display device and the flow of cooling air, where (a) is the installation posture of the projection display device, and (b) is the valve in each installation posture. (C) shows the flow of the cooling air in the lamp in each installation posture.

  The light source unit 1 includes a light source lamp 2, a substantially cylindrical concave mirror 3 that houses the light source lamp 2 and reflects light emitted from the light source lamp 2, and a transparent glass member 4 that closes the front opening of the concave mirror 3. And a concave mirror holding member 5 disposed between the concave mirror 3 and the glass member 4.

  The concave mirror holding member 5 is formed with blower ports 6a and 6b and an exhaust port 7. The blower ports 6a and 6b are provided with rotational axes in the projection space of the concave mirror opening that are substantially perpendicular to the optical axis 2a of the light source lamp 2. The rotatable air guide plates 8a and 8b are attached.

  The air outlets 6 a and 6 b are arranged in a substantially perpendicular direction with the optical axis 2 a of the light source lamp 2 as the center. The exhaust port 7 opens at a position opposite to the midpoint between the blower ports 6a and 6b. That is, the air outlets 6a and 6b are equidistant from each other, and the air outlet 7 may be provided at a position opposite to the air outlets 6a and 6b.

  The air guide plates 8a and 8b have a weight portion 8c, and rotate around the rotation shaft 8d so that the weight portion 8c is always on the lower side.

  A flow path 9 for guiding cooling air is connected to each of the air outlets 6a and 6b. A valve 10 for switching the flow path and the flow rate according to the installation orientation of the projection display device is provided in the flow path 9 and A fan (not shown) is disposed at the entrance 9a.

  Similarly to the air guide plates 8a and 8b, the valve 10 also has a weight portion 10a, and rotates around the fulcrum 10b having an axis perpendicular to the gravity direction so that the weight portion 10a is always downward.

  The flow of cooling air is indicated by arrows.

  Reference numeral 11 denotes a projection lens position in each installation posture, and 11a denotes an optical axis of the projection lens. 2A to 5B are views seen from the same direction, and as can be seen from FIG. 2, the optical axis 11a of the projection lens is orthogonal to the optical axis 2a of the light source lamp 2. .

  That is, even if the installation position of the projection display device changes as shown in FIGS. 2 to 5, the direction of the optical axis 2a of the light source lamp 2 does not change, and the positions of the air outlets 6a and 6b move around the optical axis 2a. Will do.

  Hereinafter, the relationship between the installation posture of the projection display device and the flow of cooling air will be described with reference to FIGS.

  When the projection display apparatus is installed in such a posture that the projection lens position 11 is as shown in FIG. 2 (a), the valve 10 provided in the flow path 9 is caused by its own weight as shown in FIG. 2 (b). In order to rotate and close the flow path 9 in the direction of the blower opening 6b, the fan wind is sent only from the flow path 9 to the blower opening 6a.

  And as shown in FIG.2 (c), the wind guide plate 8a attached to the ventilation port 6a and which can be rotated centering on the rotating shaft 8d is rotated by its own weight and hangs vertically downward. Therefore, the wind that has passed through the flow path 9 flows into the concave mirror 3 and is guided along the glass member 4 in the vertical upward direction.

  The wind hitting the upper part of the inner surface of the concave mirror 3 flows toward the upper part of the light source lamp 2 along the shape of the concave mirror 3, cools the light source lamp 2, and then is discharged through the exhaust port 7.

  Next, when the projection display device is installed with the projection lens position 11 as shown in FIG. 3A, as shown in FIG. 3B, the valve 10 provided in the flow path 9 is provided. Rotates due to its own weight and blocks the flow path 9 in the direction of the air outlet 6a, so that the fan wind is sent only from the flow path 9 to the air outlet 6b.

  And as shown in FIG.3 (c), the wind guide plate 8b attached to the ventilation port 6b and which can be rotated centering on the rotating shaft 8d is rotated by its own weight, and hangs vertically downward. Therefore, the wind that has passed through the flow path 9 flows into the concave mirror 3 and is guided along the glass member 4 in the vertical upward direction.

  The wind hitting the upper part of the inner surface of the concave mirror 3 flows toward the upper part of the light source lamp 2 along the shape of the concave mirror 3, cools the light source lamp 2, and then is discharged through the exhaust port 7.

  Next, when the projection display device is installed in such a posture that the projection lens position 11 is as shown in FIG. 4A, as shown in FIG. 4B, the valve 10 provided in the flow path 9 is provided. Rotates due to its own weight and blocks the flow path 9 in the direction of the air outlet 6b, so that the wind of the fan is sent only in the direction of the air outlet 6a.

  And as shown in FIG.4 (c), although the baffle plate 8a attached to the ventilation port 6a and which can be rotated centering on the rotating shaft 8d rotates by own weight, it is shown in FIG.4 (c). As shown, since the rotating shaft 8d is below the weight portion 8c, the rotating shaft 8d is inclined. For this reason, the wind that has passed through the flow path 9 flows into the concave mirror 3 in an oblique direction, is blown toward the upper part of the light source lamp 2, cools the light source lamp 2, and then is discharged through the exhaust port 7. .

  Next, when the projection display apparatus is installed in such a posture that the projection lens position 11 is as shown in FIG. 5A, as shown in FIG. Rotates due to its own weight and blocks the flow path 9 in the direction of the air outlet 6a, so that the fan wind is sent only from the flow path 9 to the air outlet 6b.

  And as shown in FIG.5 (c), although the baffle plate 8b attached to the ventilation port 6b and which can be rotated centering on the rotating shaft 8d rotates by own weight, it is shown in FIG.5 (c). As shown, since the rotating shaft 8d is below the weight portion 8c, the rotating shaft 8d is inclined. For this reason, the wind that has passed through the flow path 9 flows into the concave mirror 3 in an oblique direction, is blown toward the upper part of the light source lamp 2, cools the light source lamp 2, and then is discharged through the exhaust port 7. .

  In this manner, the direction of the valve 10 and the air guide plates 8a and 8b changes depending on the installation posture of the projection display device, and the cooling air always flows so as to cool the upper part of the light source lamp 2.

  Further, although the valve 10 is rotated by its own weight, it may have a structure in which the installation posture is detected by an angle sensor installed in the projection display device and its operation is controlled.

(Embodiment 2)
FIG. 6 is a configuration diagram of a rotary valve unit built in the projection display apparatus according to Embodiment 2 of the present invention. Since the structure and operation for cooling the light source lamp are the same as those in the first embodiment, the description thereof is omitted.

  In the figure, a valve 13 provided in the flow path 12 has a shaft 13a perpendicular to the flow path 12 and the direction of gravity, a wall surface 13b that serves to switch the flow rate, and a center of gravity 13c at a position away from the shaft 13a. It rotates with its own weight around the shaft 13a.

  By doing in this way, in Embodiment 1, since the distance from the inlet 9a of the flow path 9 to the ventilation ports 6a and 6b is different, the ventilation resistance of the fan is different and the cooling performance is also different. By adopting the structure, the distance from the inlet 12a of the flow path 12 to the blower openings 6a and 6b can be equal, and the cooling performance can be equal, and the light source can be changed without changing the fan voltage depending on the attitude of the projection display device. It becomes possible to cool the lamp optimally.

  Thus, by placing the center of gravity at a position away from the shaft 13a, the rotational operation of the valve 13 can be stabilized.

  Further, the valve 13 may be configured not to rotate by its own weight but to detect the installation posture by an angle sensor installed in the projection display device and control its operation.

(Embodiment 3)
FIG. 7 shows the installation posture of the projection display apparatus according to the third embodiment of the present invention and the configuration diagram of the built-in rotary valve unit. FIGS. 7 (a) and 7 (b), FIGS. 7 (c) and (d). ) Corresponds. Since the structure and operation for cooling the light source lamp are the same as those in the first embodiment, the description thereof is omitted.

  In the figure, two valves 15 and 16 having axes 15a and 16a perpendicular to the flow path 14 and the direction of gravity are provided in the flow path 14, and each valve includes weight portions 15b and 16b, respectively.

  When the projection display apparatus 11 is installed with the projection lens position 11 in the posture shown in FIG. 7A, the valves 15 and 16 are weight parts 15b and 16b with the shafts 15a and 16a as the center as shown in FIG. 7B. , The valve 15 does not block the flow path 14, and the valve 16 blocks the flow path 14, and sends the fan wind only in the direction of the blower opening 6a.

  When the projection display apparatus 11 is installed with the projection lens position 11 in the posture shown in FIG. 7C, the valves 15 and 16 are weight parts 15b and 16b with the axes 15a and 16a as the center, as shown in FIG. 7D. The valve 15 closes the flow path 14 and the valve 16 sends the fan wind only in the direction of the air outlet 6b without closing the flow path 14.

  In the present embodiment, the wind is sent only to each air blowing port depending on the installation posture. However, if the shape of the two valves is changed, it is possible to send the air to both the air blowing ports at a necessary ratio. is there.

  By providing a valve for each air outlet in this manner, it is possible to easily adjust the air volume ratio to each air outlet, and to cool the light source lamp optimally.

  In addition, the valves 15 and 16 may be configured not to rotate by the weight portions 15b and 16b but to detect the installation posture by an angle sensor installed in the projection display device and control the operation thereof.

  The projection display device according to the present invention can efficiently cool the upper part of the light source lamp, and prevent overcooling of the lower side of the light source lamp, regardless of the orientation of the projection display device. In addition, the right and left temperatures of the light source lamp can be optimally cooled, so that it is possible to prevent whitening, a decrease in service life, and explosion, as well as blackening and a decrease in luminance of the light source. It is very useful for increasing the reliability of the device. In addition, since a single fan can cool the projector regardless of the installation position, the projection display device can be downsized, the cost can be reduced, and the projector can be cooled efficiently, thereby reducing the noise of the projection display device. It is also possible.

1 is a schematic configuration diagram of a light source unit incorporated in a projection display apparatus according to Embodiment 1 of the present invention. The figure which shows the relationship between the installation attitude | position of the projection type display apparatus in Embodiment 1 of this invention, and the flow of cooling air The figure which shows the relationship between the installation attitude | position of the projection type display apparatus in Embodiment 1 of this invention, and the flow of cooling air The figure which shows the relationship between the installation attitude | position of the projection type display apparatus in Embodiment 1 of this invention, and the flow of cooling air The figure which shows the relationship between the installation attitude | position of the projection type display apparatus in Embodiment 1 of this invention, and the flow of cooling air Configuration diagram of a rotary valve unit built in the projection display device in Embodiment 2 of the present invention Configuration view of a projection display device according to Embodiment 3 of the present invention and a built-in rotary valve unit

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Light source part 2 Light source lamp 3 Concave mirror 4 Glass member 5 Concave mirror holding member 6a, 6b Air outlet 7 Exhaust port 8a, 8b Air guide plate 8c, 10a, 15b, 16b Weight part 9, 12, 14 Channel 9a, 12a Channel Entrance 10, 13, 15, 16 valve 10b fulcrum 11 projection lens position 13a, 15a, 16a shaft 13b wall surface

Claims (1)

A light source lamp that emits light, a substantially cylindrical concave mirror that reflects the light emitted from the light source lamp with the optical axis of the light source lamp as a central axis, a transparent member that covers the opening of the concave mirror, and a concave mirror or concave mirror and transparent In a projection display device comprising an air outlet provided between members, a display device that displays an image with light emitted from a light source lamp, and a projection lens that projects an image displayed on the display device,
The air blowing port is formed in at least two places, and a flow path for guiding cooling air is connected to the air blowing port,
The flow path is branched to guide the cooling air to at least two air outlets, and a valve that rotates by gravity and communicates the cooling air to one of the air outlets is arranged at the branch point. And
At the air outlet, a rotating shaft is located in the projection space of the concave mirror opening, and an air guide plate that rotates by gravity and changes the direction of the cooling air is arranged.
The air outlet is formed so as to be located above, below, or on the side of the light source lamp depending on the installation orientation of the projection display device, and cooling air is supplied to the air outlet located above or below the light source lamp. The valve pivots so that
Further, when the cooling air is guided from the air outlet located above the light source lamp, the air guide plate is rotated so that the cooling air is directly blown toward the upper direction of the light source lamp in the oblique direction, and the light source When the cooling air is guided from the air outlet located below the lamp, the air guide plate is rotated so that the cooling air is blown indirectly toward the upper portion of the light source lamp along the shape of the upper concave mirror. A projection display device characterized by being configured to move.

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