Optics: image projectors – Temperature control – Blower
Reexamination Certificate
2002-10-11
2004-03-23
Adams, Russell (Department: 2851)
Optics: image projectors
Temperature control
Blower
C353S061000, C362S218000, C362S294000, C362S373000
Reexamination Certificate
active
06709112
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to a structure of a light source device using a discharge lamp and a structure of a projection type display device on which the light source device is mounted.
2. Description of the Background Art
As a light emitting source of a light source device to be mounted on a projection type display device such as a liquid crystal projector, a discharge lamp such as a high pressure mercury-vapor lamp or a metal halide lamp has often been used. Since the discharge lamp of this kind has a very high internal pressure during lighting, it rarely bursts during lighting. There is a danger if the discharge lamp bursts and a fragment thereof is thereby scattered to the outside of a light source device or the outside of a projection type display device. Therefore, a fragment scattering prevention structure has conventionally been introduced into the light source device.
FIG. 19
is a perspective view showing an external structure of a conventional light source device,
FIG. 20
is a sectional view showing a sectional structure taken along a virtual plane A in
FIG. 19
, and
FIG. 21
is a sectional view showing a sectional structure taken along a virtual plane B in
FIG. 19
(see Japanese Patent Application Laid-Open No. 10-223023 (1998)). In
FIGS. 19
to
21
, the reference numeral
1
denotes a discharge lamp, the reference numeral
2
denotes a base, the reference numeral
3
denotes a feeder, the reference numeral
4
denotes a concave reflecting mirror, the reference numeral
5
denotes a front plate formed of a translucent material, the reference numeral
6
denotes a sleeve, the reference numeral
7
denotes an adhesive, the reference numeral
8
denotes a wire net, the reference numeral
9
denotes a cervical portion, the reference numerals
100
to
102
denote vent holes, the reference numeral
10
denotes a whole light source device, and a line C
1
-C
2
denotes a center of an optical axis.
Next, description will be given to the structure and operation of the light source device
10
. The discharge lamp
1
fixed to the base
2
is inserted in the cervical portion
9
of the concave reflecting mirror
4
. The base
2
is fixed to the sleeve
6
with the adhesive
7
. The sleeve
6
is fixed to the concave reflecting mirror
4
with the adhesive
7
after the optical axis C
1
-C
2
is adjusted. The front plate
5
to be a light emitting surface is bonded and fixed to an opening on the light emitting side of the concave reflecting mirror
4
. A container surrounding the discharge lamp
1
is constituted by the concave reflecting mirror
4
and the front plate
5
. The vent hole
100
is formed on a peripheral edge of the opening on the light emitting side of the concave reflecting mirror
4
(see FIG.
20
), and the wire net
8
is provided over the vent hole
100
. While the vent hole is provided in four places of the concave reflecting mirror in the Japanese Patent Application Laid-Open No. 10-223023 (1998), the vent hole in only one place is shown for simplicity of the drawing.
A partial nick is provided on the sleeve
6
, thereby forming the vent holes
101
and
102
. Cooling air is introduced and discharged through the vent holes
100
to
102
between an internal space of the light source device
10
(an internal space of the container constituted by the concave reflecting mirror
4
and the front plate
5
) and an external space so that the discharge lamp
1
is cooled down.
In the case in which the discharge lamp
1
bursts during lighting, a fragment thereof is enclosed in the light source device
10
by means of the front plate
5
and the wire net
8
provided over the vent hole
100
. Such a structure has widely been applied to a current main light source device such as a projection type display device.
FIG. 22
is a perspective view showing an external structure of a conventional projection type display device,
FIG. 23
is a front view showing a structure of an axial flow fan mounted on the conventional projection type display device, and
FIG. 24
is a perspective view showing an internal structure of the conventional projection type display device. In
FIG. 22
, the reference numeral
501
denotes a projection lens, the reference numeral
502
denotes an operation panel, the reference numeral
504
denotes an axial flow fan, the reference numeral
510
denotes a projecting luminous flux and the reference numeral
500
denotes a whole projection type display device. In
FIG. 23
, moreover, the reference numeral
506
denotes a fan case, the reference numeral
507
denotes a rotation axis of a wing, the reference numerals
504
a
and
504
b
denote fan wings which are adjacent to each other, and the reference numeral
504
denotes the whole axial flow fan. In
FIG. 24
, furthermore, the reference numeral
519
denotes an optical synthesizing prism, the reference numeral
520
denotes a power supply device, the reference numeral
521
denotes a cooling fan, the reference numeral
522
denotes an electronic circuit board, the reference numeral
523
denotes an optical system, the reference numeral
524
denotes a light bulb, and the reference numeral
525
denotes a light source device housing. In
FIG. 24
, the same reference numerals as those in
FIG. 22
denote the same or corresponding portions.
Next, an operation will be described with reference to
FIGS. 22 and 24
. When a power switch provided on the operation panel
502
is turned ON, a discharge lamp of a light source device provided in the light source device housing
525
is lighted up. A light emitted from the discharge lamp is controlled by the optical system
523
so that the light bulb
524
representing an image to be displayed is illuminated. The image formed by the light bulb
524
is synthesized by the optical synthesizing prism
519
and is changed into the projecting luminous flux
510
by means of the projection lens
501
, and is thus projected onto a display surface such as a screen. When the discharge lamp is lighted up, the axial flow fan
504
is operated for cooling the discharge lamp. When the axial flow fan
504
has such a wing structure that a great clearance
504
ab
is provided between the wings
504
a
and
504
b
adjacent to each other in an orthogonal projected image obtained by orthogonal projection in a direction of the rotation axis
507
of the wing (a perpendicular direction to the paper) (when the wing is projected onto a projecting surface perpendicular to the rotation axis
507
by parallel rays with the rotation axis
507
of the wing).
The conventional light source device
10
has the above-mentioned structure. For this reason, there is a problem in that a smaller fragment than a dimension of meshes of the wire net
8
or a smaller fragment than a clearance provided between the discharge lamp
1
and an internal surface of the cervical portion
9
is scattered to the outside of the light source device
10
at a wind pressure applied at time of a burst and cannot be completely enclosed in the light source device
10
.
Moreover, since the conventional projection type display device
500
has the above-mentioned structure, there is a problem in that a fragment coming out of the light source device easily passes through the clearance
504
ab
between the wings of the fan
504
toward the outside when the discharge lamp bursts during lighting for some reason.
SUMMARY OF THE INVENTION
It is an object of the present invention to provide a light source device and a projection type display device which can completely enclose a fragment therein even if a discharge lamp bursts during lighting.
A first aspect of the present invention is directed to a light source device comprising a discharge lamp, a container, a first vent hole and a cutoff mechanism. The container is provided to surround the discharge lamp and partially has a translucent light emitting surface. The first vent hole is provided in the container. The cutoff mechanism has a movable member for being pressed by a pressure wave applied from an
Bessho Tomohiro
Hirose Tatsuro
Iwai Toshimitsu
Kawaguchi Mitsuhiro
Miyamoto Teruo
Adams Russell
Dalakis Michael
Mitsubishi Denki & Kabushiki Kaisha
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