JP4167385B2 - Light source cooling device for projection display device - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a light source device for a projection display device such as a liquid crystal projector, and more particularly to cooling a lamp serving as a light source.
[0002]
[Prior art]
Conventionally, liquid crystal projectors are widely used as projection display devices. This liquid crystal projector emits light modulated from the liquid crystal panel by irradiating light from the light source onto the transmissive liquid crystal panel and driving the liquid crystal panel based on information signals from television signals, personal computers, etc. The enlarged image is projected onto the screen through the projection lens.
[0003]
Since a high voltage discharge lamp such as a halogen lamp, a xenon lamp, or a metal halide lamp is used as the light source, it is necessary to suppress radiant heat from these light sources, and there is a method of sending cooling air to the lamp using a blower fan. Generally known.
[0004]
For example, in Japanese Patent Laid-Open No. 10-186517, a suction fan for sucking outside air and an exhaust fan are provided in the vicinity of the lamp section, and a ventilation path is provided from the suction fan to the exhaust fan through the lamp. An example of air cooling is described.
[0005]
However, in the conventional lamp cooling device, since the fan for sending the cooling air to the lamp is arranged on the bottom surface side of the lamp, the thickness of the projector device tends to increase, and the number of parts forming the air path increases. There was the inconvenience that the whole became large.
[0006]
[Problems to be solved by the invention]
In the projection display device described above, since the cooling fan for cooling the lamp is disposed on the bottom surface side of the lamp, the thickness of the projector device increases and the number of parts forming the air path increases, so that the entire device becomes large. There was an inconvenience. An object of the present invention is to provide a light source cooling device that maintains the light source cooling function and enables the projection display device to be thin and small.
[0007]
[Means for Solving the Problems]
The present invention includes a lamp holder for holding a lamp for a light source;
An opening formed in the housing for mounting or removing the lamp holder in the housing of the projection display device; and
A cover for closing the opening;
Blower means mounted in the housing and for blowing cooling air toward the opening,
An air passage formed to guide the cooling air from the air blowing means in the lamp direction is provided between the cover and the lamp holder when the opening is closed by the cover. It is a light source cooling device of the projection type display device.
[0008]
According to the present invention, an air passage is formed between the lamp holder and the cover by closing the opening of the housing with the cover, and the wind from the blower is blown into the lamp through the air passage. Can be cooled.
[0009]
DETAILED DESCRIPTION OF THE INVENTION
Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a plan view illustrating the overall configuration of a projection display device according to an embodiment of the present invention. FIG. 1 shows an example of a three-plate liquid crystal projector having liquid crystal panels for R (red), G (green), and B (blue).
[0010]
In FIG. 1, reference numeral 10 denotes a lamp house, in which a lamp 3 including an arc tube 1 and a reflector 2 is disposed as a light source, and a fan (main book) for sending cooling air to the lamp house 10. In the example, a sirocco fan 11) is installed. Light from the arc tube 1 is reflected by the reflector 2, and unnecessary light such as infrared rays and ultraviolet rays is removed by the filter 12, and then supplied to the dichroic mirror 15 via the condenser lens 13 and the reflection mirror 14.
[0011]
The dichroic mirror 15 splits the light from the lamp 3 into R light and GB light, and the separated R light is reflected by the mirror 16 and applied to the R liquid crystal panel 18 via the field lens 17.
[0012]
The GB light separated by the dichroic mirror 15 is split into G light and B light by the dichroic mirror 19, and the G light is irradiated to the G liquid crystal panel 21 through the field lens 20, and the B light is relay lens 22, The liquid crystal panel 27 for B is irradiated through the reflection mirror 23, the relay lens 24, the reflection mirror 25, and the relay lens 26.
[0013]
Further, the R light, G light, and B light transmitted through the liquid crystal panels 18, 21, and 27 are combined by a dichroic prism 28, and the combined image light is projected onto a screen (not shown) by a projection lens 29. I have to.
[0014]
In this way, a color image can be projected by driving the R, G, and B liquid crystal panels 18, 21, and 27 with R, G, and B primary color signals. Note that polarizing plates are arranged on the incident side and the emission side of the liquid crystal panels 18, 21, 27, respectively.
[0015]
The projection type display device of the present invention is roughly composed of the lamp house 10, an optical box including a liquid crystal panel and the projection lens 29. The configuration of the cooling device for cooling the light source will be described below.
[0016]
FIG. 2 is a perspective view of the projection display device as viewed from the bottom side. An opening 31 is provided on the bottom surface of the housing 30, and a cover 32 is attached so as to close the opening 31. Normally, the cover 32 is closed, and the lamp house 10 shown in FIG. 3 is attached to the upper portion of the opening 31 in the housing 30. The lamp house 10 covers the outer periphery of the lamp 3 and the lamp holder 33, and a sirocco fan 11 is attached to a side surface of the lamp house 10, and a wind tunnel 11 a is provided at a wind outlet portion of the sirocco fan 11. ing.
[0017]
4A and 4B show the configuration of the lamp holder 33 and the lamp 3, wherein FIG. 4A is a perspective view seen from the top surface direction, and FIG. 4B is a perspective view seen from the bottom surface side. The lamp 3 is supported by a substantially L-shaped lamp holder 33. When the lamp is replaced, the cover 32 is opened, the lamp holder 33 is removed from the opening 31 and the lamp is replaced.
[0018]
Further, the lamp holder 33 is formed with a slope 34 for guiding the cooling air blown from the wind tunnel 11a of the sirocco fan 11 to the bottom surface from the side surface to the bottom surface. An opening 35 is formed, and a convex guide rib 36 is formed around a path from the inclined surface 34 to the ventilation opening 35.
[0019]
Since the ridge portion of the rib 36 is in contact with the upper surface of the cover 32 by closing the opening 31 with the cover 32, the cooling air from the sirocco fan 11 is ejected from the slope 34 and is surrounded by the rib 36 and the cover 32. It is led to the vent hole 35 through the air passage. The rib 36 may be provided on the cover 32 side.
[0020]
On the other hand, a vent hole 2a is formed on the bottom surface of the reflector 2 of the lamp 3 at a position facing the vent hole 35, and cooling air can be blown into the reflector 2 from the vent hole 2a. The lamp 3 has a plurality of holes 2b (see FIG. 1) in the support portion 4 that supports the arc tube 1, and the cooling air introduced from the ventilation holes 2a is led out from the plurality of holes 2b. . Alternatively, a hole may be formed in the upper surface of the reflector 2 and the cooling air may be led out through this hole.
[0021]
In addition, a wire mesh 37 (see FIG. 3) is installed between the vent hole 35 and the vent hole 2a to prevent dust or the like from entering the lamp 3, or in the event that the arc tube 1 is ruptured. But it prevents the debris from popping out.
[0022]
Further, by fixing a thin aluminum plate or iron plate to the inner surface of the cover 32, or by forming the cover 32 itself with a material having good thermal conductivity, the heat radiation effect can be enhanced. Temperature rise can be suppressed.
[0023]
Moreover, although the example using the sirocco fan 11 is shown as a blowing means, it is not limited to this, and other blowing means such as blowing the wind from the rotating fan in the direction of the opening through the duct is used. You can also.
[0024]
As described above, in the projection display device of the present invention, the lamp house 10 is attached to the inside of the housing 30, and the lamp holder 33 can be attached or removed through the opening 31 provided on the bottom surface of the housing 30. After the lamp holder 33 is attached to the lamp house 10, the opening 31 is closed with the cover 32, whereby an air passage is formed by the rib 36 formed on the bottom surface of the lamp holder 33 and the cover 32, and is formed on the side surface of the lamp house 10. The wind from the mounted sirocco fan 11 can be blown into the lamp through this air path to cool the lamp 3.
[0025]
Therefore, according to the present invention, the cooling air from the sirocco fan 11 provided on the side surface portion of the lamp 3 is guided to the vent hole 35 through the air passage surrounded by the rib 36 and the cover 32, and the lamp 3 is discharged from the bottom surface of the lamp 3. 3 Since the air is blown into the inside of the lamp, it is not necessary to dispose a fan for blowing air on the bottom surface of the lamp.
[0026]
Further, the cover 32 is conventionally used as a lamp replacement cover, and it is not necessary to use a special part to form the air path, and the air path can be formed without increasing the number of parts. In addition, it can contribute to making the entire device thinner.
[0027]
【The invention's effect】
As described above, according to the present invention, it is possible to prevent the temperature of the lamp from increasing and to reduce the thickness of the projection device without increasing the number of parts.
[Brief description of the drawings]
FIG. 1 is a plan view illustrating the overall configuration of a projection display device according to an embodiment of the invention.
2 is a perspective view of the projection display device of FIG. 1 as viewed from the bottom.
FIG. 3 is a perspective view of a lamp house used in the projection display device of the present invention as seen from the bottom.
4A and 4B are diagrams showing a state in which the lamp holder is taken out from the lamp house of FIG. 3, wherein FIG. 4A is a perspective view seen from the top surface, and FIG. 4B is a perspective view seen from the bottom surface.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 ... Arc tube 2 ... Reflector 2a ... Ventilation hole 3 ... Lamp 10 ... Lamp house 11 ... Sirocco fan 30 ... Housing 31 ... Opening 32 ... Cover 33 ... Lamp holder 35 ... Ventilation port 36 ... Guide rib

Claims (9)

In a projection display device having a light source,
A lamp holder for holding the lamp for the light source;
An opening formed in the housing for mounting or removing the lamp holder in the housing of the projection display device; and
A cover for closing the opening;
Blower means mounted in the housing and for blowing cooling air toward the opening,
An air passage formed to guide the cooling air from the air blowing means in the lamp direction is provided between the cover and the lamp holder when the opening is closed by the cover. A light source cooling device for a projection display device. The air passage has a guide rib provided on the surface of the lamp holder on the opening side, and passes through the space surrounded by the guide rib when the opening is closed by the cover. The light source cooling device for a projection type display device according to claim 1, wherein cooling air is supplied to the lamp. The light source cooling device for a projection display device according to claim 1, wherein a metal plate is fixed to the cover. The lamp includes an arc tube and a reflector that reflects light from the arc tube, and has a ventilation hole in a part of the reflector, and the wind from the air path is supplied into the reflector through the ventilation hole. The light source cooling device for a projection display device according to claim 1, wherein 5. The light source cooling device for a projection display device according to claim 4, wherein a wire mesh is installed between the ventilation hole of the reflector and the air passage. In a projection display device having a light source, a liquid crystal panel on which light emitted from the light source is incident, and a projection unit that projects the transmitted light from the liquid crystal panel onto a screen,
A lamp for the light source including an arc tube and a reflector that reflects light from the arc tube, and a vent hole is formed in a part of the reflector;
A lamp holder that holds the lamp and forms a ventilation opening in a portion facing the ventilation hole;
An opening formed in the housing for mounting or removing the lamp holder in the housing of the projection display device; and
A lamp house that is mounted at a position facing the opening in the housing and can store the lamp holder;
A blower attached to the side surface of the lamp house and for blowing cooling air toward the opening,
An air passage formed so as to blow cooling air from the blower toward the vent hole of the lamp between the cover and the lamp holder when the opening is closed by the cover; A light source cooling device for a projection type display device. The air passage has guide ribs provided on the surface of the lamp holder on the opening side from the vicinity of the blower opening of the blower toward the ventilation hole of the lamp, and the opening is closed by the cover. 7. The light source cooling device for a projection type display device according to claim 6, wherein cooling air from the blowing means is supplied into the lamp through a space surrounded by guide ribs. The light source cooling device for a projection type display device according to claim 6, wherein the blower is a sirocco fan attached to a side surface of the lamp house and having a blower port disposed toward the opening. 7. The light source cooling device for a projection type display device according to claim 6, wherein a wire mesh is installed between a ventilation hole of the lamp and the ventilation opening provided in the lamp holder.

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