JP3348653B2 - Projector device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a projector capable of reducing wind noise generated when a heat sink for cooling a lamp is air-cooled by a fan.

[0002]

2. Description of the Related Art Since there is an increasing demand for displaying images on a large screen, projector devices for projecting images on a screen have become widespread. In a projector device, light emitted from a lamp is projected on a screen. Since the lamp becomes hot at the time of lighting, the lamp is cooled by mounting a heat sink on the lamp and further providing a cooling fan near the lamp.

Here, a conventional projector device will be described with reference to FIG. FIG. 6 shows only the peripheral portion of the lamp in cross section. In FIG. 6, a lamp 1 is provided in front and behind a xenon arc lamp 1 (hereinafter, lamp 1).
And heat sinks 20, 20 for cooling the lamp 1 are mounted. Heat sink 2
No. 0 has an opening in the center where the lamp 1 is inserted, and a large number of plate-like fins 20b are formed radially. The lamp 1 and the heat sink 20 are housed in a lamp duct 21.

The rear part of the lamp duct 21 (right side in FIG. 6)
Is provided with a cooling fan 22. Cooling fan 2
2, air for cooling is taken in from the front part (left side in FIG. 6) of the lamp duct 21,
The lamp 1 and the heat sink 20 are cooled. Therefore, the air flows between the fins 20b in the direction of the arrow and is discharged to the rear.

[0005] When the heat sink 20 is air-cooled by the cooling fan 22 in this manner, wind noise is generated by the fins 20 b of the heat sink 20. Therefore, an exhaust duct 23 in which a sound absorbing material 24 is provided is disposed behind the cooling fan 22.

[0006]

In the conventional projector described above, the effect of reducing the wind noise by the sound absorbing material 24 is not so large. Therefore, if the number of the sound absorbing materials 24 is increased in order to increase the effect of reducing the wind noise, the pressure loss of the flowing air increases, and the cooling effect decreases.
There is also a problem that the exhaust duct 23 becomes large. Further, it is conceivable to reduce the flow rate of the air by the cooling fan 22 or to increase the interval between the fins 20b of the heat sink 20, but in any case, the cooling effect is deteriorated.

The present invention has been made in view of such a problem, and can effectively reduce the wind noise generated by the fins of the heat sink without deteriorating the cooling effect and without increasing the size. It is an object to provide a projector device.

[0008]

In order to solve the above-mentioned problems of the prior art, the present invention provides a lamp (1) for emitting light for displaying an image on a screen, and a plurality of lamps mounted on the lamp. A fin (20b) having a heat sink (20) and a cooling fan (22) for flowing air between the fins to cool the heat sink. It is an object of the present invention to provide a projector device characterized in that a net-shaped rectifier (25) is attached to an end face.

[0009]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, a projector device according to the present invention will be described with reference to the accompanying drawings. FIG. 1 is an exploded perspective view showing a main part of the projector device of the present invention, FIG. 2 is a cutaway perspective view showing a main part of the projector device of the present invention, and FIG.
FIG. 4 is a plan view showing another configuration example of the rectifier 25 in FIGS. 1 and 2, FIG. 4 is a diagram showing another configuration example of the heat sink 20 in FIGS. 1 and 2, and FIG. FIG. 2 is a diagram showing an example of the overall configuration of FIG. In FIGS. 1 and 2,
Portions having the same functions as those in FIG. 6 are denoted by the same reference numerals.

First, an example of the overall configuration of the projector device of the present invention will be described with reference to FIG. Here, a configuration of a reflection type liquid crystal projector device is shown, and its operation will be described.

In FIG. 5, light emitted from a lamp 1 which is, for example, a xenon arc lamp is incident on a mirror 2. The light reflected by the cold mirror 2 enters the dichroic mirror 3. Of the light incident on the dichroic mirror 3, red (R) light passes through the dichroic mirror 3 and is incident on the mirror 5. This R light is reflected by the mirror 5 and is incident on a polarization beam splitter (PBS) 9.

The blue (B) / green (G) light is reflected by the dichroic mirror 3 and enters the dichroic mirror 4. Of the light incident on the dichroic mirror 4, G
The light is reflected by the dichroic mirror 4 and is incident on a polarization beam splitter (PBS) 10. Of the light incident on the dichroic mirror 4, the B light passes through the dichroic mirror 4 and is incident on a polarization beam splitter (PBS) 11.

The R light that has entered the PBS 9 reflects only the S-wave component at the joint surface thereof and enters the liquid crystal panel 6. The S-wave component incident on the liquid crystal panel 6 is reflected by the liquid crystal panel 6 to become a P-wave component, passes through the joint surface of the PBS 9, and is incident on the combining prism 12. G incident on PBS10
In the light, only the S wave component is reflected at the joint surface, and the liquid crystal panel 7
Is incident on. The S-wave component incident on the liquid crystal panel 7 is reflected by the liquid crystal panel 7 to become a P-wave component, passes through the joint surface of the PBS 10, and is incident on the combining prism 12.

The B light incident on the PBS 11 reflects only the S-wave component on the joint surface thereof, and is incident on the liquid crystal panel 8.
The S-wave component incident on the liquid crystal panel 8 is reflected on the liquid crystal panel 8 to become a P-wave component, passes through the joint surface of the PBS 11, and is incident on the combining prism 12. The liquid crystal panels 6 to
As is well known, a voltage corresponding to the image is applied to 8,
The incident R, G, and B lights are respectively modulated.

R, G, B incident on the combining prism 12
The light is combined by the combining prism 12 and the projection lens 1
3 is projected on the screen 14. Thus, an image is displayed on the screen 14.

Next, the peripheral portion of the lamp 1 which is a main part of the present invention will be described in detail. 1 and 2, heat sinks 20, 2 for cooling the lamp 1 are provided on the front and rear portions of the lamp 1, which are electrodes of the lamp 1.
0 is attached. The heat sink 20 has an opening 20a in the center portion through which the lamp 1 is inserted, and a large number of plate-like fins 20b are formed radially. The lamp 1 and the heat sink 20 are housed in a lamp duct 21 as shown in FIG. Light from the lamp 1 is emitted to the left in FIG.

The rear part of the lamp duct 21 (right side in FIG. 1)
Is provided with a cooling fan 22. Cooling fan 2
2, air for cooling is taken in from the front part (left side in FIG. 1) of the lamp duct 21,
The lamp 1 and the heat sink 20 are cooled. Therefore, the air flows between the fins 20b in the direction of the arrow shown in FIG. 2 and is discharged to the rear.

When the heat sink 20 is air-cooled by the cooling fan 22 in this manner, wind noise is generated by the fins 20b of the heat sink 20. The wind noise is generated when the air passing between the fins 20b moves away from the fins 20b, and the vortex of air generated at the rear of the heat sink 20 separates from the fins 20b.

Therefore, in the present invention, the rectifier 25 made of a grid-shaped wire mesh is directly attached to the heat sink 20 on the right side in FIG. Rectifier 25
For example, a screw (not shown) is attached to the heat sink 20.
Attach by As another means, caulking or welding can be used. The size and shape of the rectifier 25 are substantially the same as the size and shape of the end face of the heat sink 20.

As described above, the rectifier 25 is connected to the heat sink 2.
0 and the cooling fan 22 and the heat sink 2
By directly attaching to the heat sink 20, the air vortex generated at the rear part of the heat sink 20 is broken down into small vortices, and substantially no vortex is formed, whereby wind noise can be effectively reduced.

The shape of the grid of the rectifying body 25 is not limited to a rectangular grid formed by plain weave as shown in FIGS. 1 and 2, but the rectifying body 2 having a honeycomb structure as shown in FIG.
5 'may be used, and various shapes such as twill weave, cedar twill weave, tatami weave and the like can be adopted. The rectifier 25,
The size of the grid 25 'may be appropriately set in consideration of the pressure loss and the exhaust efficiency.

A heat sink 2 for cooling the lamp 1
The shape of 0 is not limited to FIGS.
A heat sink 20 'having a shape as shown in FIG.

The configuration of the present invention described above can be applied not only to the xenon arc lamp 1 but also to any other lamps. In this embodiment, the heat sink 20
The lamp also serves as an electrode of the lamp 1, but may be a normal heat sink not serving as an electrode. The present invention is not limited to the embodiment described above, and can be variously modified without departing from the gist of the present invention.

[0024]

As described above in detail, in the projector device of the present invention, the net-like rectifier is attached to the leeward end face of the air flowing between the fins of the heat sink.
Without deteriorating the cooling effect, without increasing the size
The wind noise generated by the fins of the heat sink can be effectively reduced.

[Brief description of the drawings]

FIG. 1 is an exploded perspective view showing a main part of the present invention.

FIG. 2 is a cutaway perspective view showing a main part of the present invention.

FIG. 3 is a plan view showing another configuration example of the rectifier 25 in FIGS. 1 and 2;

FIG. 4 is a diagram showing another configuration example of the heat sink 20 in FIGS. 1 and 2.

FIG. 5 is a diagram showing an example of the overall configuration of the present invention.

FIG. 6 is a sectional view showing a conventional example.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Lamp 20, 20 'Heat sink 20a Opening 20b Fin 21 Lamp duct 22 Cooling fan 25, 25' Rectifier

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int.Cl. ⁷ , DB name) G03B 21/00-21/30 H04N 5/74

Claims (1)

(57) [Claims] 1. A lamp for emitting light for displaying an image on a screen, a heat sink having a plurality of fins mounted on the lamp, and cooling for flowing air between the fins to cool the heat sink. A projector device comprising a fan, wherein a net-shaped rectifier is attached to an end face of the heat sink on the leeward side of the air.