JP2002298639A - Light source device and projection display device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To cool the light source most suitably even if the projection display device is used in reversed top and bottom, when the light source is applied for a projection display device. SOLUTION: As an air blowing part which is provided at the vicinity of the front opening part of a reflector 11 and sends the outside air to the upper part or lower part of the light source as much as possible, a duct 21 is arranged adjacent to the air blowing port 17. Inside the duct 21, a wind direction control plate 22 is provided, and one end of the wind direction control plate 22 is supported by the wind direction control plate rotation axis 23 so that it may rotate around the wind direction control plate rotation axis 23 against the duct 21.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a light source device used for a projection display device or the like.

[0002]

2. Description of the Related Art A projection display apparatus for providing a large-screen image uses a transmissive or reflective liquid crystal panel or a DLP in which a micromirror is movable as an image display device, and uses a high-intensity white light source for the image display device. And the projected image is enlarged and projected on the screen by the projection lens.

As a light source used in the above-mentioned projection display device, a metal halide lamp or a high-pressure mercury lamp of 100 to 400 W is used, and a discharge lamp such as a xenon lamp of about 1 kW is used for large-sized equipment. Among them, a high-pressure mercury lamp is a main light source used in a projection display device because it has a high luminous efficiency, a high light efficiency of an optical system due to a small arc spot, and a long life.

FIG. 4 is a sectional view of a light source device using a conventional discharge lamp used for a projection display device disclosed in Japanese Patent Application Laid-Open No. 2000-57825. 1 is a discharge lamp, 2
Is an arc tube, 3a and 3b are electrodes, 4a and 4b are sealing portions, 5
a and 5b are lead rods, 6a and 6b are lead wires, 11 is a reflector, 12 is a reflection surface, 13 is a flat glass, 14 is a lamp holding member, 15 is an adhesive, 16 is a lamp insertion opening,
Reference numeral 18 denotes an air outlet, 51 denotes a ventilation member, and 52 denotes a cooling air outlet.

The discharge lamp 1 has an arc tube 2 having a pair of electrodes 3a and 3b disposed thereon, and a sealing portion 4a, 4a for keeping airtightness between the arc tube interior 2c and the outside by adhering a conductive foil with glass.
b. The lit electrodes 3a and 3b are:
Since the temperature rises to 2500 to 3000 ° C., tungsten, which is a metal with low thermal evaporation, is used. In addition, quartz glass having excellent heat resistance is used for the glass constituting the discharge lamp 1. In the case of a high-pressure mercury lamp, mercury, a rare gas such as argon or xenon, or a halide is sealed in the arc tube interior 2c. Lead bars 5a and 5b protrude outward from the glass members of the sealing portions 4a and 4b, respectively, in order to establish conduction between the sealing portions 4a and 4b and the conductive foil. Further, the lead rods 5a and 5b are connected to the lead wires 6a and 6b, respectively.
b. When electric power is supplied from the lead wires 6a and 6b, an arc is formed between the electrodes 3a and 3b, and the discharge lamp 1 emits light.

In order to condense the light transmitted through the arc tube 2, a reflector 11 having a concave shape such as an elliptical surface or a parabolic surface is used.
Has been arranged. The reflector 11 has a reflection surface 12 formed of a metal film or a dielectric multilayer film that efficiently reflects light in the visible light region on an inner surface made of borosilicate glass or crystallized glass. When the discharge lamp 1 is a high-pressure mercury lamp, the inside of the arc tube 2c during operation is at a high pressure of 100 to 200 atm due to the vapor pressure of vaporized mercury. For this reason,
In the event that the discharge lamp 1 ruptures, the light emitting opening of the reflector 11 is
It is covered with a light transmitting flat glass 13. At the center of the reflecting surface 12 of the reflector 11, a lamp insertion opening 16 is provided.
The discharge lamp 1 fixed to the lamp holding member 14 with the adhesive 15 is inserted into the lamp insertion opening 16, and then fixed to the reflector 11 on the lamp holding member 14 with the adhesive 15.

In general, a discharge lamp 1 used in a projection type display device is used in a horizontal posture, and as described above, the discharge lamp 1 has a reflector 11 and a flat glass 13.
, The temperature inside the discharge lamp 1 is high. The highest temperature is at the upper part 2b of the arc tube. According to the related art, when a 150 W discharge lamp is turned on without blowing cooling air, the upper part may be at about 1060 ° C. and the lower part at about 880 ° C. When used in a high temperature state, the upper portion 2b of the arc tube having a high temperature causes a devitrification phenomenon in which the arc tube becomes white and cloudy, which causes a sudden decrease in illuminance, or causes deformation or rupture of the arc tube 2 due to softening of the glass.

In order to solve this problem, the reflector 11
Is provided with a ventilation member 51 and a cooling air outlet 52 at a lower portion of the lower portion.
Further, the lamp holding member 14 is provided with an exhaust port 18.
The cooling air 71 sent from the cooling air outlet 52 reflects the reflecting surface 12 of the reflector 11 (cooling air 72), and cools the upper part 2 b of the arc tube while the lamp insertion opening 16 and the lamp holding member 14 of the reflector 11 are being cooled. The heat is released to the outside of the reflector 11 through the air outlet 18 (cooling air 73).

[0009]

In the light source device of the prior art as described above, when the light source device is applied to a projection type display device, the cooling air outlet 52 must always be used with the lower side. Here, FIG. 5 shows a projection mode of the projection display device. The projection display device 61a is a floor-mounted projection type, and a projection screen 62a emitted from the projection display device 61a projects a large-screen image on a screen 63 in front. On the other hand, the projection type display device 61b is a ceiling-hanging projection type, and is used in an upside-down configuration with respect to the projection type display device 61a.

A projection type display device 61a of a floor-standing projection type
In addition, when the above-described conventional light source device is applied, the cooling air outlet 52 of the light source device must be configured to be on the lower side. In the projection display device 61b in the ceiling-hanging configuration, the light source device shown in FIG. 4 is also turned upside down, so that the temperature of the arc tube 2a becomes the highest, and the cooling air further cools the arc tube 2b having the lower temperature. Become. Undercooling of the arc tube causes a problem that the vapor pressure of the mercury sealed in the arc tube decreases and the luminous efficiency decreases.

[0011]

According to the light source device of the present invention, a wind direction control plate for sending more outside air to an upper part or a lower part of the light source is provided in a conduit, and a vicinity of a front opening of the concave reflecting mirror is provided. It is provided with a blower arranged in a.

Further, the wind direction control plate is rotatably supported in the conduit by gravity and has a stopper for restricting the rotation so as to be positioned at a predetermined angle in the conduit.

Further, in the projection type display device according to the present invention, the concave reflecting mirror provided with the air outlet in the vicinity of the light source supporting portion, the light transmitting member covering the front opening of the concave reflecting mirror, and the light source inside the conduit are provided. A light source device having a wind direction control plate for sending more outside air to an upper portion or a lower portion, and having a blower disposed near a front opening of the concave reflecting mirror;
And a sirocco fan for sending outside air to the blower.

A concave reflector provided with an air outlet in the vicinity of the light source support; a light transmitting member for covering the front opening of the concave reflector; and more external air in the conduit above or below the light source. A light source device having an air flow direction control plate and an air blower disposed near the front opening of the concave reflecting mirror; and an axial fan for discharging air from the air outlet. .

[0015]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiment 1 FIG. 1A shows a front view of the light source device according to Embodiment 1, and FIG.
(B) is a cross-sectional view of the light source device according to Embodiment 1. 1 is a discharge lamp as a light source, 2 is an arc tube, 3a, 3
b is an electrode, 4a and 4b are sealing parts, 5a and 5b are lead rods, 6a and 6b are lead wires, 11 is a reflector which is a concave reflecting mirror provided with an air outlet near the light source support, 12 is a reflecting surface, 13 is a flat glass that is a light transmitting member that covers the front opening of the concave reflecting mirror, 14 is a lamp holding member, 15 is an adhesive, 16 is a lamp insertion opening, 17 is an air outlet, 18 is an air outlet, and 21 is outside air. A duct which is a guiding conduit, 22 is a wind direction control plate rotatably supported by gravity in the duct 21, 23 is a rotation axis of the wind direction control plate, and 24a and 24b are wind direction control plates 22 at predetermined angles in the duct 21. It is a stopper for restricting the rotation so as to be located.

The discharge lamp 1 includes a light emitting tube 2 on which a pair of electrodes 3a and 3b are arranged, and sealing portions 4a and 4b for sealing the inside of the light emitting tube 2c from the outside by adhering a conductive foil with glass.
It consists of. The lit electrodes 3a and 3b have 250
Tungsten, which is a metal with low thermal evaporation, is used because the temperature becomes high at 0 to 3000 ° C. Also, discharge lamp 1
The quartz glass having excellent heat resistance is used for the glass constituting the above. In the case of a high-pressure mercury lamp,
Noble gases such as mercury, argon and xenon, and halides are sealed. In order to establish conduction with the conductive foil of the sealing portions 4a and 4b, the lead rods 5a and 5b are connected to the sealing portions 4a and 4b, respectively.
The lead rods 5a and 5b are connected to lead wires 6a and 6b, respectively. When electric power is supplied from the lead wires 6a, 6b, an arc is formed between the electrodes 3a, 3b,
The discharge lamp 1 emits light. In order to condense the light transmitted through the arc tube 2, a reflector 11 having an elliptical or parabolic concave shape is disposed.

The reflector 11 has a reflective surface 12 formed of a metal film or a dielectric multilayer film that efficiently reflects light in the visible light region on the inner surface of a borosilicate glass or crystallized glass as a base material. When the discharge lamp 1 is a high-pressure mercury lamp, the inside of the arc tube 2c during operation is at a high pressure of 100 to 200 atm due to the vapor pressure of vaporized mercury. For this reason, in the event that the discharge lamp 1 ruptures, the light-emitting opening of the reflector 11 is covered with a light-transmitting flat glass 13 in order to prevent scattering of glass and electrodes. A lamp insertion opening 16 is formed at the center of the reflection surface 12 of the reflector 11, and the lamp holding member 1 is inserted into the lamp insertion opening 16.
4, the discharge lamp 1 fixed with the adhesive 15 is inserted, and then the reflector 15 is attached to the lamp holding member 14 by the adhesive 15.
Securely fix with.

The reflector 11 is a part of the side surface of the opening,
A notch is provided in the horizontal direction when the light source device is used. By combining the reflector 11 and the flat glass 13, an air outlet 17 is formed. A lamp holding member 14 is fixed to a discharge lamp insertion opening 16 at the center of the reflector 11, and the discharge lamp 1 is fixed to a predetermined position with the lamp holding member 14 and an adhesive 15. An exhaust port 18 is provided in the lamp holding member 14 in the vicinity of the light source support portion.
An air passage that flows from the inside of the reflector 11 to the outside through the air outlet 18 is formed.

In order to blow cooling air into the interior of the reflector 11, it is provided near the front opening of the reflector 11 and is adjacent to the air outlet 17 as an air blowing unit for sending more outside air to the upper or lower part of the light source. A duct 21 is provided. A wind direction control plate 22 is provided inside the duct 21, and one end of the wind direction control plate 22 is connected to the wind direction control plate rotating shaft 2.
3 supports the duct 21 so as to be rotatable about the wind direction control plate rotation shaft 23 with respect to the duct 21. The stoppers 24a and 24b of the duct 21 limit the movable range so that the wind direction control plate 22 is at a predetermined angle. Fig. 1
In the downward direction as described, the wind direction control plate 22 is tilted and stabilized by its own weight like a wind direction control plate 22a indicated by a solid line. When the light source device is turned upside down, the wind direction control plate 22 is inclined and stabilized like the wind direction control plate 22b indicated by the broken line.

As described above, the cooling air 31 sent into the duct 21 is divided into two by the wind direction control plate 22. Cooling air 32 flowing from the upper part of the wind direction control plate 22 to the air outlet 17
Is reflected by the reflecting surface 12 of the reflector 11 and the cooling air 3
As shown in FIG. 4, the gas passes through the vicinity of the arc tube upper portion 2b, passes through the lamp insertion opening 16 and the air outlet 18, and is exhausted to the outside of the reflector 11. Cooling air 33 passing below the wind direction control plate 22
Passes through the vicinity of the sealing portion 4 a, is reflected by the reflection surface 12, becomes cooling air 35, passes through the lamp insertion opening 16 and the air outlet 18, and is exhausted to the outside of the reflector 11.

As described above, since the strong wind flows relatively above the reflector 11 to cool the upper part 2b of the arc tube where the discharge lamp 1 becomes the hottest, the devitrification phenomenon can be suppressed and the upper part 2b of the arc tube can be suppressed. The temperature difference between the lower portion 2a and the lower portion 2a can be reduced, so that a stable arc can be obtained.

When the light source device of the present invention is mounted on the projection display device 61a in a floor-standing posture shown in FIG. 5, and the projection display device 61b is used in a suspended position, the light source device in FIG. . At this time, the light emitting section 2a becomes the hottest,
As described above, since the wind direction control plate 22 is movable in accordance with the use posture, the discharge lamp can be cooled to the same state regardless of the use position of the light source device.

Embodiment 2 FIG. FIG. 2 shows a projection display device according to Embodiment 2 of the present invention, and shows an example of a cooling air blower of the light source device. 41 is a sirocco fan, 4
2 is a rotating fin of the sirocco fan 41. In the sirocco fan 41, the cooling air 31 is generated by the rotation of the donut-shaped rotating fins 42, whereby the cooling air 36 sucked in from the side surface of the circular portion of the sirocco fan 41 is exhausted from the rectangular opening. By connecting the opening shape of the exhaust portion of the sirocco fan 41 and the opening shape of the duct 21 so as to substantially match with each other, the cooling air 31 can be efficiently sent into the duct 21.

An axial fan may be used in place of the sirocco fan 41. However, the opening diameter of the duct 21 needs to match the diameter of the rotating fin of the axial fan. 21 increases in size. The sirocco fan is suitable for use in that the diameter of the rotating fin increases as the air volume increases, but the same opening shape of the exhaust portion can be selected.

Embodiment 3 FIG. 3 shows a projection type display device according to Embodiment 3 of the present invention, and shows another example of the exhaust means in the light source device. Reference numeral 43 denotes a housing that covers the reflector 11, 44 denotes an axial fan, and 45 denotes a rotating fin of the axial fan 44. The heat inside the reflector 11 becomes cooling air 34 and 35 and is exhausted to a space surrounded by the reflector 11 and the housing 43. By rotating the rotating fins 45 of the axial fan 44, the exhaust air 37 inside the housing 43 becomes the exhaust air 38 outside the housing 43, and the heat inside the reflector 11 can be efficiently exhausted. In addition, by increasing the degree of sealing between the reflector 11, the housing 43, and the axial fan 44, the flow of the cooling air described in FIG. 1 can be generated only by the rotation of the axial fan 44.

Although a sirocco fan may be used in place of the axial fan, the outer shape of the reflector 11 is 50 to 10 degrees.
Since it is a zero-angle rectangle or a circle inscribed in the rectangle, an axial fan matching this shape may be selected, and a relatively large axial fan can constitute the exhaust means.

The cooling air blowing means shown in FIG.
The heat generated in the discharge lamp 1 can be cooled more efficiently, and the heat inside the reflector 11 can be exhausted to the outside by using the exhaust means shown in FIG.

[0028]

The present invention has the following effects because it is configured as described above.

The light source device has a wind direction control plate for sending more outside air to the upper part or the lower part of the light source in the conduit, and has a blower disposed near the front opening of the concave reflecting mirror. Regardless of the attitude of the light source, the discharge lamp can always be cooled in the same state, and a large amount of cooling air is sent to the high temperature side of the light source according to the attitude of the light source device.

Further, the wind direction control unit is supported by the wind direction control plate so as to be rotatable by gravity in the conduit, and restricts the rotation so that the wind direction control plate is positioned at a predetermined angle in the conduit. By having the stopper, a large amount of cooling air is sent to the high temperature side of the light source according to the direction of gravity of the light source device.

Further, by providing the sirocco fan for sending the outside air to the blowing unit, the outside air can be efficiently sent to the blowing unit.

Further, by providing an axial fan for discharging air from the air outlet, a compact display device having high cooling efficiency can be constructed.

[Brief description of the drawings]

FIG. 1A is a front view of a light source device according to Embodiment 1 of the present invention. FIG. 2B is a cross-sectional view of the light source device according to Embodiment 1 of the present invention.

FIG. 2 is a perspective view of a light source device blower of a projection display apparatus according to Embodiment 2 of the present invention.

FIG. 3 is a cross-sectional view near a light source device of a projection display according to a third embodiment of the present invention.

FIG. 4 is a cross-sectional view of a conventional light source device.

FIG. 5 is a diagram showing a projection mode of the projection display device.

[Explanation of symbols]

1 discharge lamp, 2 arc tube, 3a electrode, 3b
Electrode, 4a sealing part, 4b sealing part, 5a lead rod, 5b lead rod, 6a lead wire, 6b
Lead wire, 11 reflector, 12 reflecting surface,
13 flat glass, 14 lamp holding member, 15
Adhesive, 16 lamp insertion opening, 17 cooling air vent, 18 exhaust vent, 21 duct, 22 wind direction control plate, 41 sirocco fan, 42 rotating fin,
43 housing, 44 axial fan, 45 rotating fin, 51 ventilation member, 52 cooling vent,
61a projection type display device, 61b projection type display device,
62a projection light, 62b projection light, 63 screen.

Claims (4)

[Claims] 1. A concave reflector provided with an air outlet in the vicinity of a light source support, a light transmitting member covering a front opening of the concave reflector, and more external air in an upper portion or a lower portion of the light source in a conduit. A light source device comprising: a wind direction control plate; and a blower disposed near a front opening of the concave reflecting mirror. 2. The apparatus according to claim 1, wherein said wind direction control plate is rotatably supported in said conduit by gravity and has a stopper for restricting rotation so as to be positioned at a predetermined angle in said conduit. Item 2. The light source device according to item 1. 3. A concave reflector provided with an air outlet in the vicinity of a light source support, a light transmitting member for covering a front opening of the concave reflector, and more external air in an upper portion or a lower portion of the light source in a conduit. A light source device having a wind direction control plate for blowing and having a blower disposed near a front opening of the concave reflecting mirror; and a sirocco fan for sending outside air to the blower. Projection display device. 4. A concave reflector provided with an air outlet in the vicinity of a light source support, a light transmitting member for covering a front opening of the concave reflector, and more outside air to an upper part or a lower part of the light source in a conduit. A light source device having an air flow direction control plate and an air blower disposed near a front opening of the concave reflector; and an axial fan for discharging air from the air outlet. Projection type display device.