JP2002027361A - Image display device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an image display device wherein, even when a wall exists on the rear surface of a venthole, the wall is not discolored due to the light leaking from a light source, an exhaust capacity is not lowered by the clogged venthole and a noise level is lowered. SOLUTION: The image display device is composed of a light source lamp 1 which is attached to the inside of a concave mirror 2. The device is composed of an exhaust fan 7 which is used to remove the heat from the lamp 1. The device is composed of a back cover 9 which has the venthole 10. The device is composed of a light shielding panel 11. The device is constituted in such a way that the light leaking to the outside through the venthole 10 in the back cover 9 is shielded by the panel 11.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an image display device using a light source lamp, for example, a structure for preventing light from leaking from a light source portion of a liquid crystal projector, a DLP projector or the like.

[0002]

2. Description of the Related Art Conventionally, as a light leakage prevention structure in a liquid crystal projector or the like, for example, Japanese Patent Application Laid-Open No. 09-30483 is disclosed.
No. 4 is proposed. The configuration in this case is to provide a movable fin in the opening on the back of the lamp box,
The fins are driven according to the temperature inside the housing, the opening can be changed, and the hot air is exhausted out of the housing through the ventilation hole on the back of the housing, giving priority to preventing light leakage at low temperatures and giving priority to the exhaust capacity at high temperatures. Has become.

[0003]

However, in the above configuration, when the temperature is high, the fins are fully opened, and light from the light source leaks out of the housing through the ventilation hole on the back of the housing, and there is a wall or the like behind the ventilation hole on the back of the housing. However, there is a problem that the wall is discolored by the light of the light source directly hitting the wall due to the influence of ultraviolet rays or the like. In addition, there is a problem in that the ventilation holes on the rear surface of the housing are closed due to the presence of the wall, the exhaust capability is reduced, and the temperature inside the housing increases. Further, there is a problem that the noise level is increased because the air is directly discharged from the ventilation holes of the housing.

The present invention solves such a conventional problem,
It is an object of the present invention to prevent the light from the light source from leaking even when a wall is provided on the rear surface of the ventilation hole, discoloring the wall, closing the ventilation hole, preventing the exhaust capability from being reduced, and further reducing the noise level.

[0005]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, the present invention provides a light-shielding panel for blocking light emitted from a ventilation hole of a back cover, and the flow of air flowing out of the ventilation hole of the back cover is changed up and down. It was configured to be attached to the back cover so as to be distributed to the left and right.

According to the above configuration, it is possible to prevent light leakage and reduce the noise level without lowering the exhaust capacity.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A first aspect of the present invention comprises a light source lamp mounted in a concave mirror, an exhaust fan for exhausting heat from the light source lamp, a back cover having a ventilation hole, and a light shielding panel. A light-shielding panel that blocks light that leaks out through the ventilation holes of the back cover, thereby preventing light leakage without lowering the exhaust capability and lowering the noise level. .

According to a second aspect of the present invention, in the light-shielding panel, the center portion has a conical shape or a quadrangular pyramid shape, and the air flow out of the ventilation holes of the back cover is dispersed vertically and horizontally. The image display device according to the first aspect, wherein the air exhausted from the ventilation hole of the back cover has a conical shape or a quadrangular pyramid shape at the center of the light shielding panel. The flow resistance decreases along the air flow, and the air volume is further increased, thereby improving the exhaust capacity.

According to a third aspect of the present invention, there is provided the image display apparatus according to the first aspect, wherein a duct is provided on the front and rear surfaces of the exhaust fan, or on either the front surface or the rear surface. As a result, there is no obstacle such as a vent hole before and after the exhaust fan, the airflow resistance is low, the airflow increases, and the noise level decreases.

Hereinafter, a video display device according to an embodiment of the present invention will be described with reference to the drawings.

(Embodiment 1) FIG. 1 is an exploded perspective view of a main part of a video display device according to Embodiment 1 of the present invention as viewed from the back side, and FIG. 2 is a sectional view of FIG. 1 as viewed from above. is there.

1 and 2, reference numeral 1 is a light source lamp, 2 is a concave mirror, 3 is a lamp box, 4 is an elastic holding member for locking the concave mirror 2 to the lamp box 3, and 5 is a lamp box 3 inserted and withdrawn. A lamp house having a box shape so as to be able to be formed, 6 is an opening provided in the lamp house 5 for exhausting the hot air of the light source lamp 1 to the outside, 7 is an exhaust fan for discharging the hot air to the outside, and 8 is an exhaust fan. Screws for fixing the exhaust fan 7 to the lamp house 5, 9 is a back cover, 1
0 is a ventilation hole provided in the back cover, 11 is a light shielding panel,
Reference numeral 12 denotes a screw for fixing the light-shielding panel 11, 13 denotes a boss provided on the back cover for fastening the light-shielding panel with a screw, 20, 21 denotes a part of leaked light emitted from the light source lamp, 22, 23, and 24. The outgoing lights 30, 31 emitted from the light source lamp onto the surface to be irradiated show the flow of the exhausted air.

The image display apparatus of the present invention comprises a light source lamp 1 mounted in a concave mirror 2, an exhaust fan 7 for exhausting heat of the light source lamp 1, a back cover 9 having a ventilation hole 10 and a light shielding panel 11. The light that leaks out through the ventilation hole 10 of the back cover 9
It was configured to be shielded by

The size of the light shielding panel 11 is the size of the light beam 20.
And the light ray 21 are emitted from the light source lamp 1 and the ventilation hole 1 of the back cover 9.
0, and has a flat plate shape, and the flow of air flowing out of the vent hole 10 of the back cover 9 is 22, 23.
The screw 12 is used to fasten to the boss 13 provided on the back cover 9 so as to be dispersed vertically and horizontally as described above.

Further, the light source lamp 1 mounted in the concave mirror 2 is locked by an elastic holding member 4 to a lamp box 3 formed by injection molding a heat-resistant resin or pressing a steel plate or aluminum into an L-shape. Lamp box 3
The lamp house 5 is inserted into a box-shaped lamp house 5 so that it can be inserted and removed, and an opening 6 for exhausting hot air is provided on the rear surface of the lamp house 5. Further, an exhaust fan 7 for forcibly exhausting hot air to the outside is fixed to the lamp house 5 with screws 8 on the rear surface of the opening 6 of the lamp house 5. Further, the back cover 9 provided with the ventilation hole 10 is arranged on the rear surface of the exhaust fan. The shape of the ventilation hole 10 provided in the back cover 9 may be a round hole or a square hole, and may be set to any size having no problem in terms of safety standards in each market and having the highest aperture ratio.

With the above configuration, light leakage can be prevented without lowering the exhaust capacity, and the noise level can be reduced.

(Embodiment 2) FIG. 3 is a sectional view of an image display device according to Embodiment 2 of the present invention as viewed from above. In this case, the rear panel 40 is attached to the back cover 9 such that the central portion of the rear panel 40 has a conical shape or a quadrangular pyramid shape, and the flow of air flowing out of the ventilation holes 10 of the back cover 9 is dispersed vertically and horizontally. The configuration is characterized by doing so. Other configurations are the same as those of the first embodiment. With this configuration, the air exhausted from the ventilation holes 10 of the back cover 9 flows along the conical shape or the quadrangular pyramid shape at the center of the light shielding panel 40, and the ventilation resistance is reduced, so that the air volume is further increased and the exhaust capacity is improved. I do.

(Embodiment 3) FIG. 4 is a sectional view of an image display device according to Embodiment 3 of the present invention as viewed from above. The configuration in this case includes the front and rear surfaces of the exhaust fan 54,
Alternatively, a square-tube-shaped front duct 50 and a rear duct 51 are provided on one of the front surface and the rear surface. The front duct 50 was attached to the lamp house 52 with screws 53, and the exhaust fan 54 was fixed with screws 55 so as to be sandwiched between the front duct 50 and the rear duct 51. Other configurations are the same as those of the first embodiment or the second embodiment. With this configuration, there is no obstacle such as a vent hole before and after the exhaust fan 54, the airflow resistance is small, the airflow increases, and the noise level also decreases.

[0019]

As described above, according to the present invention, even when there is a wall on the rear surface of the ventilation hole, the light from the light source does not leak and the wall is not discolored, and the ventilation hole is closed and the exhaust capability is reduced. No noise level is further reduced.

[Brief description of the drawings]

FIG. 1 is an exploded perspective view of a main part of a video display device according to a first embodiment of the present invention, as viewed from a back surface direction.

FIG. 2 is a sectional view of FIG. 1 as viewed from above.

FIG. 3 is a cross-sectional view of the image display device according to Embodiment 2 of the present invention when viewed from above.

FIG. 4 is a cross-sectional view of an image display device according to Embodiment 3 of the present invention when viewed from above.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Light source lamp 2 Concave mirror 3 Lamp box 4 Elastic holding member 5, 52 Lamp house 6 Opening 7, 54 Exhaust fan 8, 12, 53, 55 Screw 9 Back cover 10 Vent hole 11, 40 Light shielding panel 13 Boss 20, 21 Leakage Light 22, 23, 24 Outgoing light 30, 31 Air flow 50 Front duct 51 Rear duct

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI Theme coat ゛ (Reference) G02F 1/13357 F21M 1/00 J G03B 21/00 7/00 L // F21Y 101: 00 G02F 1/1335 530 F term (reference) 2H088 EA12 HA14 HA28 MA20 2H091 FA34Z FA41Z FD01 LA03 LA04 MA07 3K014 LA01 LB03 MA02 MA05 MA08 3K042 AA01 AC06 BA07 BB01 BC01 CC04 CC06 5C058 AA06 BA33 BA35 EA13 EA26 EA52

Claims (4)

[Claims] 1. A light source lamp mounted in a concave mirror, an exhaust fan for exhausting heat of the light source lamp, a back cover having a ventilation hole, and a light-shielding panel, leaking out through the ventilation hole of the back cover. An image display device, wherein light from the light source lamp is blocked by the light shielding panel. 2. The size of the light-shielding panel is substantially larger than the angle between the light source and the ventilation hole of the back cover, and has a flat plate shape, and the flow of air flowing out of the ventilation hole of the back cover is dispersed vertically and horizontally. 2. The image display device according to claim 1, wherein the image display device is attached to the back cover so as to be operated. 3. The light-shielding panel has a central portion formed in a conical shape or a quadrangular pyramid shape, and is attached to the back cover such that the flow of air that has flowed out from the ventilation holes of the back cover is dispersed vertically and horizontally. The video display device according to claim 1, wherein: 4. A duct is provided on at least one of a front surface and a rear surface of the exhaust fan.
4. The video display device according to any one of Items 3 to 3.