JP2003021823A - Cooling device for projector - Google Patents

Abstract

PROBLEM TO BE SOLVED: To efficiently cool the liquid crystal panel of a projector. SOLUTION: Air sucked from the outside of a casing by a fan 1 is sent to a part 8 to be cooled through a duct 2 to cool three red, green, and blue liquid crystal panel parts. The inside of the duct is partitioned into areas 6R, 6G, and 6B corresponding to three liquid crystal panel parts by partitions 5a and 5b, and fins 3a and 3b turned like fans by driving shafts 4a and 4b are provided on both sides of the entrance of the duct, and directions of two fins are changed at intervals of a prescribed time to successively send air from the fan to areas 6R, 6G, and 6B by switching. Air is jetted from a jet 7R, 7G, or 7B to successively cool the red, green and blue liquid crystal panel parts. Because of subsequent concentrated cooling, each liquid crystal panel part is efficiently cooled to improve the overall cooling efficiency, and the fan can be made quiet by miniaturization and reduction of the rotational frequency. Air may be sent alternately to two areas 6R and 6G and two areas 6G and 6B. The fin direction switching method and the switching time interval can be properly set.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a projector cooling device using liquid crystal panels, and more particularly to a device for efficiently cooling three liquid crystal panels.

[0002]

2. Description of the Related Art In a projector device using a liquid crystal panel, a powerful lamp is used as a light source in order to increase the brightness of a projected image. The liquid crystal panel is irradiated with a light beam from a light source, its temperature rises, and the performance of the liquid crystal panel deteriorates. For this reason, it is common to use a fan to inhale the air outside the housing, blow the inhaled air to the three liquid crystal panels, and cool the liquid crystal panels at the same time. Exhaust to the outside of the case with the fan.

[0003]

SUMMARY OF THE INVENTION An object of the present invention is to efficiently cool each liquid crystal panel by switching the air sucked by one fan and sequentially blowing the air to three liquid crystal panels.

[0004]

In order to achieve the above object, a projector cooling apparatus according to the present invention includes a fan for sucking outside air from the outside of a housing, and an air connected to the fan and sucked by the fan. Ducts for sending to the cooled part consisting of three liquid crystal panel parts for red, green and blue, and the air that is arranged in the duct and sent through the ducts to the respective areas of the three liquid crystal panel parts. Two partition plates for dividing, and two partition plates rotatably arranged on both sides of the entrance of the duct for switching the air from the fan to one of the regions partitioned by the partition plate. A fin and an ejection port for ejecting air sent by the fin and the partition plate to each of the three liquid crystal panel portions formed at a position corresponding to each liquid crystal panel portion of the duct are provided, and the direction of the fin Control The fin control means for providing the air sucked by the fan sequentially feed the regions divided by the partition plate by the fin control means sequentially cooling said three liquid crystal panels of.

By controlling the directions of the two fins, the air sucked by the fan is sequentially sent to the respective regions of the three liquid crystal panel sections one by one, or the three liquid crystal panels are controlled. The panels are alternately sent to two adjacent areas.

The fin control means sets the directions of the two fins so that the air sucked by the fan is sequentially sent to the respective regions of the three liquid crystal panel portions, one region at a time. A setting unit that sets the two liquid crystal panel units to be alternately sent to adjacent two areas, a storage unit that stores the set contents, and a setting unit that reads the setting contents from the storage unit. It is composed of a fin drive unit that switches the directions of the two fins and a control unit that controls the storage unit and the fin drive unit.

Therefore, a clock unit is provided, and the directions of the two fins are switched at predetermined time intervals measured by the clock unit.

Alternatively, by the fin control means, the air sucked by the fan is sequentially sent to the respective areas of the three liquid crystal panel sections by one area at different time intervals, or the same three liquid crystal panel sections are provided. The directions of the two fins may be switched so that the two adjacent regions are alternately fed at different time intervals.

The fan and the duct may be connected by using a connection unit so that only the fan or the duct can be detached.

A sirocco fan may be used as the fan.

[0011]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described based on examples with reference to the drawings. FIG. 1 is a configuration diagram of a main part of an embodiment of a projector cooling device according to the present invention, in which a is a top view and b is a side view. Reference numeral 1 in the figure denotes a fan, for example, a sirocco fan is used. 1a is an intake port of the fan 1, 2 is a duct, 3a and 3b are fins rotated by drive shafts 4a and 4b, and 5a.
5b is a partition plate, 6R, 6G and 6B are areas for three liquid crystal panel parts for red, green and blue respectively, 7R, 7G and 7B are jet ports, 8 is three liquid crystal for red, green and blue It is a cooled part provided with a panel part.

The fan 1 sucks in air from an intake port 1a and sends it to a cooled part 8 having three liquid crystal panel parts by a duct 2. The air from the fan 1 is blown by the drive shafts 4a and 4b by the fins 3a and 3b which are rotated in a fan shape as shown by the dotted lines, and the air flow direction is changed, and the region 6R on the left side of the partition plate 5a in the duct 2 is
(There is a red liquid crystal panel part in this part of the cooled part 8), a region 6G partitioned by partition plates 5a and 5b (the green liquid crystal panel part is located), and a region 6B on the right side of the partition plate 5b.
(There is a liquid crystal panel for blue). The air sent to these areas 6R, 6G or 6B is blown out from the jet outlets 7R, 7G or 7B, and for red, green or blue above each jet outlet 7R, 7G or 7B (front side in Fig. B). The air that has cooled the liquid crystal panel and is heated is exhausted by an exhaust fan (not shown).

Alternatively, as shown in FIG.
The fins 3a and 3b may be switched so that the air sent by the fan 1 is alternately blown by the fins 3a and 3b to two regions, that is, the adjacent regions 6R and 6G and the regions 6G and 6B.

FIG. 3 is a block diagram of a main part of fin control means for controlling the switching of the directions of the fins 3a and 3b.
11 is a setting unit, 12 is a storage unit, 13 is a fin drive unit, 14 is a clock unit, and 15 is a control unit. The fins 3a, 3b for switching the direction of the air from the fan 1 are switched by the operation of the setting unit 11 so as to sequentially blow the respective regions in the order of the regions 6R, 6G, 6B as shown in FIG. Area 6R as shown in 2
And 6G and two regions 6G and 6B are set to be switched alternately so as to blow air. The set data is stored in the storage unit 12 via the control unit 15, and based on the data read from the storage unit 12, the fin drive unit 13 drives the drive shaft 4a.
And 4b are driven to switch the direction of the fins 3a and 3b to the set direction at predetermined time intervals measured by the clock unit 14. Alternatively, if there is a difference in temperature rise depending on the liquid crystal panel, change the fin direction switching time interval depending on the region, and set it so that the air blowing time to the region where the temperature rises is longer than the air blowing time to other regions. May be.
In addition, in the case of FIG. 2, since the air is blown to the area 6G in any case, the gaps on the fin side of the partition plates 5a and 5b are appropriately narrowed and jetted from the jet outlets 7R, 7G, 7B. Balance the total air volume or make it a predetermined ratio.

In this way, the air from the fan 1 is intensively blown to only one liquid crystal panel area or two liquid crystal panel area instead of the entire area of the three liquid crystal panel areas. As a result, since the liquid crystal panel section has a higher cooling efficiency than the conventional one, the temperature rise during the interruption of the air flow is small, and overall good cooling efficiency can be obtained. As a result, the fan 1 can be made smaller than the conventional one. It is possible to reduce the size of the motor or reduce the rotation speed to reduce noise. Further, as shown in FIG. 4, by connecting the fan 1 and the duct 2 using the connection unit 21, it is possible to remove only the fan 1 or the duct 2, and to inspect and repair the fan 1 and the duct 2. Will be easier.

[0016]

As described above, according to the projector cooling device of the present invention, the air sucked by the fan (using a sirocco fan) is distributed to the respective regions of the liquid crystal panel for red, green or blue. Since the air is blown sequentially to each area or to two adjacent areas, the liquid crystal panel part of the area that has been blown is efficiently cooled, and the temperature rise during the interruption of the air blow is small. The cooling efficiency is improved, and as a result, the fan can be made smaller than the conventional one to downsize the motor, or the rotational speed of the fan can be lowered to reduce the noise. In addition, it is possible to set in the setting unit of the fin control means whether the regions of the three liquid crystal panel units are sequentially cooled one by one, or the two adjacent regions are alternately cooled. Since the interval can be set, when there is a liquid crystal panel unit whose temperature rises more than others, it is possible to reduce the unevenness of temperature rise by making the air blowing time to the liquid crystal panel unit longer than others. Further, by connecting the fan and the duct with the connection unit, it is possible to remove only the fan or the duct and perform repair or inspection.

[Brief description of drawings]

FIG. 1 is a configuration diagram of essential parts of an embodiment of a projector cooling apparatus according to the present invention.

FIG. 2 is a main part configuration diagram of another embodiment of the projector cooling apparatus according to the present invention.

FIG. 3 is a principal block diagram of fin control means of the projector cooling device according to the present invention.

FIG. 4 is a side view of a main part when a fan and a duct are connected by a connection unit.

[Explanation of symbols]

1 fan 1a Inlet 2 ducts 3a, 3b fins 4a, 4b drive shaft 5a, 5b divider 6R, 6G, 6B Red, green, blue liquid crystal panel area 7R, 7G, 7B spout 8 Cooled part (liquid crystal panel part) 11 Setting section 12 Memory 13 Fin drive 14 Clock section 15 Control unit 21 Connection unit

Claims (8)

[Claims] 1. A fan for sucking outside air from the outside of the housing, and the air which is connected to the fan and sucked by the fan is sent to a cooled portion including three liquid crystal panel portions for red, green and blue. For dividing, two partition plates arranged in the duct for dividing the air sent by the duct into the respective areas of the three liquid crystal panel parts, and a rotary type on both sides of the inlet of the duct. Two fins for switching the air from the fan to any of the areas partitioned by the partition plate, and the fins formed at locations corresponding to the liquid crystal panel portions of the duct, A jet port for jetting the air sent by the partition plate to each of the three liquid crystal panel parts is provided, and fin control means for controlling the direction of the fins is provided so that the air sucked by the fan is the same. Fin control A cooling device for a projector, which sequentially feeds the three liquid crystal panel parts by means of means to the regions partitioned by the partition plate. 2. By controlling the orientation of the two fins,
2. The cooling device for a projector according to claim 1, wherein the air sucked by the fan is sequentially sent to each of the areas of the three liquid crystal panel units one by one. 3. By controlling the directions of the two fins,
The projector cooling device according to claim 1, wherein the air sucked by the fan is alternately sent to two adjacent regions of each of the three liquid crystal panel portions. 4. The fin control means sets the directions of the two fins so that the air sucked by the fan is sequentially sent to the respective regions of the three liquid crystal panel units one by one, or , A setting section for setting to alternately send to two adjacent areas of each of the three liquid crystal panel sections, a storage section for storing the set content, and a setting content read from the storage section The cooling device for a projector according to claim 1, further comprising: a fin drive unit that switches the directions of the two fins, and a control unit that controls the storage unit and the fin drive unit. 5. The cooling device for a projector according to claim 4, wherein a clock unit is provided, and the directions of the two fins are switched at a predetermined time interval measured by the clock unit. 6. The fin control means sequentially sends the air sucked by the fan to the respective areas of the three liquid crystal panel sections by one area at different time intervals, or the same three liquid crystal panel sections. 6. The cooling device for a projector according to claim 5, wherein the directions of the two fins are switched so as to alternately feed the two adjacent regions at different time intervals. 7. The projector cooling device according to claim 1, wherein the fan and the duct are connected using a connection unit, and only the fan or the duct can be removed. 8. The cooling device for a projector according to claim 1, wherein a sirocco fan is used as the fan.