JP2003115215A - Light source device and projector device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a light source device capable of restraining devitrification of an arc tube, of keeping a high illuminance factor and of extending a service life by efficiently cooling it with limited cooling airflow, in a horizontal lighting, explosion-proof and sealed type light source device internally installed in a projector device and to provide a projector device using the light source device. SOLUTION: This light source device having a sealed structure has a both end sealed type discharge lamp, a reflecting concave mirror holding the one-side sealing part of the discharge lamp at its neck part for emitting light emitted from the discharge lamp toward the front side, and a front glass panel covering the front face of the reflecting concave mirror. The light source device is characterized by being combined with a cooling mechanism provided with an air guide passage for locally blowing the cooling air from an intake fan disposed separately from the light source device to the outside surface part of the reflecting concave mirror adjacent to the upper part of the arc tube of the discharge lamp.

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 liquid crystal projector device or a light source for fiber illumination, and more particularly to a cooling mechanism.

[0002]

2. Description of the Related Art As a light source used in a liquid crystal projector device, an ultrahigh pressure mercury lamp having high brightness and excellent color rendering is used in order to obtain a high quality image. In general, an ultra-high pressure mercury lamp uses a lamp of 80 W or more in which 0.15 mg / mm ² or more of mercury, which has a high light-collecting rate close to a point light source and an excellent color balance, is added to the total luminous flux is used. It Since this lamp has a pressure in the arc tube that exceeds 15 MPa during operation, a front glass is placed in the front opening of the concave reflecting mirror, and the lamp is roughly sealed except for the lamp cooling opening. Explosion-proof structures have come to be used to protect optical components and the like that are placed.

In an ultra-high pressure mercury lamp as a light source, the temperature of the upper part of the arc tube becomes the highest at the time of lighting, and the maximum temperature reaches 1000 ° C., which causes swelling and devitrification of the arc tube, leading to rupture. There is. A conventional light source device 10 is shown in FIG.
In FIG. 4, the light source device 10 is assembled in the projector device 100, and the light source device 10 is cooled. The front glass 3 is arranged in the front opening of the concave reflecting mirror 2, a cooling air intake port 15 is provided below the front glass 3, and the cooling air sucked by the intake fan 13 is provided on the concave reflecting mirror 2 and the front surface of the light source device 10. It is introduced into the space surrounded by the glass 3 to cool the upper part of the arc tube of the discharge lamp 10 which has a high temperature, and to discharge it from the opening 23 of the lamp base 22 for cooling.

However, when a liquid crystal projector device or a DLP ^™ (Texas Instruments Inc.) projector device as home use equipment begins to spread, the PL (product liability) problem becomes a serious problem. In other words, even if a lamp bursts, the problem is to prevent the fragments of the arc tube glass and the scattering of the inclusions in the arc tube. When it comes to home use, noise from cooling air becomes a problem. In addition to the high image quality of the screen, portable projector devices of recent years are becoming smaller and smaller.
There is a strong demand for thinner and lighter products.

Therefore, it is necessary to provide an explosion-proof sealed light source device having an explosion-proof structure in which a hole for leading out a power supply lead wire from a lamp is sealed, and in such a light source device,
Cooling air cannot be introduced into the space surrounded by the reflector of the light source device and the front glass, and it is required to cool the lamp from the outside of the concave reflector. However, it is difficult to provide a fan dedicated to cooling the light source in a projector device that is required to be small, thin, and lightweight. Therefore, the amount of cooling air used for cooling the light source is limited.

Therefore, the arc tube of the lamp is not sufficiently cooled, the temperature of the upper part of the arc tube of the lamp rises, exceeds the allowable temperature to withstand use, and devitrification occurs at the upper part of the arc tube, which maintains the illuminance of the lamp. There is a problem in that the light source device has a shorter life and the light source device has a shorter life.

[0007]

SUMMARY OF THE INVENTION Therefore, an object of the present invention is to provide a horizontal lighting / explosion-proof sealed light source device internally mounted in a projector device, by efficiently cooling with a limited cooling air volume, the arc tube. It is an object of the present invention to provide a light source device that suppresses devitrification and maintains a high illuminance maintenance rate and has a long life, and a projector device that uses the light source device.

[0008]

In order to solve the above-mentioned problems, the invention according to claim 1 holds a discharge lamp of both ends sealed type, and one of the sealed parts of the discharge lamp is held at its neck,
What is claimed is: 1. A light source device having a concave structure for emitting light emitted from the discharge lamp forward, and a front glass for covering the front surface of the concave mirror, the light source device having a hermetic structure for horizontal lighting, the light source comprising: A combination of a cooling mechanism provided with an air guide passage for locally blowing cooling air from an intake fan arranged apart from the device to the outer surface of the concave reflecting mirror near the upper part of the discharge lamp of the discharge lamp. A light source device characterized by the above.

According to a second aspect of the invention, there is provided the light source device according to the first aspect, wherein the concave reflecting mirror is made of crystallized glass.

According to a third aspect of the present invention, there is provided a light source device according to the first aspect, wherein a cooling fin is provided on an outer surface portion of the concave reflecting mirror near the upper portion of the arc tube of the discharge lamp. Is.

According to a fourth aspect of the present invention, there is provided a projector device using the light source device according to any of the first to third aspects, wherein a part of the cooling air from the intake fan is provided above the arc tube of the discharge lamp. The projector device is provided with a cooling mechanism in which an air guide path for locally blowing air is provided on an outer surface portion of the concave reflecting mirror which is adjacent to the concave reflecting mirror.

[0012]

1 is a schematic view of a light source device of the present invention. 1A is a view of the light source device as seen from above, and FIG. 1B is a view of the light source device as seen from a side surface. The light source device 10 includes a concave reflecting mirror 2 that holds one sealing portion of the discharge lamp 1 at a neck portion and a front glass 3.
Then, the discharge lamp 1 of the light source device 10 placed horizontally is provided.
A blower duct 4 for locally blowing cooling air from an intake fan (not shown) is arranged on the outer surface of the concave reflecting mirror near the upper part of the arc tube. The blower duct 4 is an example of the air guide path in the present invention, and the portion for blowing the wind on the concave reflecting mirror 2 may be in the form of a thinner pipe. 21 is a lamp base. A hole for leading out the power supply lead from the lamp sealing portion on the opening side of the reflecting mirror to the outside of the concave reflecting mirror is omitted in the drawing. In FIG. 1, the discharge lamp 1
It is shown that the cooling air is blown from the lateral direction to the outer surface of the concave reflecting mirror close to the upper part of the arc tube of the discharge lamp. This is because it is difficult to blow the cooling air from above the tube, and it is preferable to blow the cooling air from above the arc tube of the discharge lamp if there is enough space.

FIG. 2 shows an embodiment in which a cooling fin 5 is provided on the outer surface portion of the concave reflecting mirror adjacent to the upper portion of the discharge tube 1 of the discharge lamp 1 of the light source device 10 which is locally cooled in FIG.
FIG. 2A is a view of the light source device as seen from the back side. Figure 2
(B) is the figure seen from the side surface. Although the cooling fins 5 are arranged parallel to the opening of the blower duct so as to follow the flow of air from the opening of the blower duct, the arrangement is not limited to this arrangement.
You may arrange | position so that it may line up diagonally with respect to the opening of a ventilation duct.

To provide this cooling fin, a concave surface is required.
The reflecting mirror is made of, for example, sintered quartz glass or Al. _TwoO_Three(Aluminum
The material is used for slip casting and resin molding.
With the concave injection mirror with the injection press technology
It can be integrally formed.

[0015]

EXAMPLES Next, specific examples will be described.
FIG. 1 shows a schematic view of the light source device of the present invention. The lamp used as the light source is a quartz glass arc tube having an outer diameter of 10 mm and a wall thickness of 3 mm, and 0.15 mg / mm ³ of mercury and a buffer gas. It is an ultra-high pressure discharge lamp filled with a fixed amount of rare gas, and its lamp input is 130W. The front glass is hard glass or Vycor with a wall thickness of 3.8
mm.

The concave reflecting mirror 2 has an opening size of 50 m.
It is a parabolic mirror having an m-square angle and an F value of 5.7, and is made of crystallized glass containing a β-spodumene solid solution, a Eucrypt solid solution, or the like. The thickness of crystallized glass is 4.0 mm
Thus, a multi-layer reflective film in which 37 layers of TiO ₂ films and SiO ₂ films are alternately combined is formed on the inner surface of the concave reflecting mirror. This multilayer reflective film has a function of reflecting visible light and transmitting in the infrared region.

FIG. 3 shows a schematic configuration diagram of the projector apparatus of the present invention. 3A is a view of the device seen from above, and FIG. 3B is a view of the device seen from the side. The projector device 100 includes a lamp lighting device 1 in a box of the device.
2, polarization beam splitter 7, liquid crystals 8a, 8b, 8c,
The color mixing cross prism 11, the projection lens 9, the blower duct 4, the integrator lens, the polarization mirror, various lenses, and the like. In FIG. 3, each member is omitted as appropriate.

As can be seen from FIG. 3 (b), a part of the cooling air entering from the cooling intake fan 13 has an opening of 20 mm.
2 to 3 m / s directly through the rectangular air-blowing duct 4 to a location close to the upper part of the discharge lamp 1 of the discharge lamp 1 of the concave reflecting mirror 2 made of crystallized glass, which has a higher thermal conductivity than borosilicate glass.
It was blown with an air flow of ec. This air flow rate is about 30% of the air volume flowing through the entire projector device 100. Figure 3
As can be seen from the above, recent projector devices have become thinner, and the exhaust fan 14 is often provided on the side surface of the device due to dimensional restrictions. Therefore, the cooling air from the blower duct 4 is radiated not from above the light source device 10 but from the lateral direction so as to lick the upper surface of the concave reflecting mirror 2.

In the projector apparatus of the present invention, the maximum temperature of the concave reflecting mirror, that is, the discharge lamp, is higher than that in the case of natural air cooling in which air is blown all over the projector apparatus without locally cooling the concave reflecting mirror. Temperature of the outer surface of the concave reflecting mirror near the upper part of the arc tube of 580 to 450
The temperature of the upper part of the arc tube of the discharge lamp is reduced to 103
It was possible to lower the temperature from 0 ° C to 1005 ° C by 25K. As a result, defects such as devitrification and swelling did not occur in the arc tube, and it was 500 hours when the illuminance of the lamp was maintained (50% of the initial illuminance) and the concave reflecting mirror was not locally cooled. On the other hand, it was 1000 hours, which was a significant improvement.

The borosilicate glass was used instead of the crystallized glass as the material of the concave reflecting mirror, and the upper temperature of the arc tube of the above discharge lamp was measured. However, the temperature decreased only up to 1015 ° C. There were also cases where the mirror cracked.

In the present invention, the decrease in the maximum temperature of the arc tube of the discharge lamp is caused by the decrease in the amount of heat radiated from the concave reflecting mirror to the discharge lamp, and the local strong wind flow near the concave reflecting mirror. It is thought that this is due to a synergistic effect with the increase in heat dissipation due to convection due to.

In the example of FIG. 1, as shown in FIG. 2, a flat plate having a height of 4 mm and a wall thickness of 3 mm from the upper root of the reflector neck portion toward the opening direction is an arc-shaped flat plate fin along the back surface of the concave mirror. When No. 5 was placed, the temperature at the rearmost part of the inner surface of the reflecting mirror was lowered to 400 ° C, which was 50 ° C lower than that without fins. At this time, the lamp temperature became 1000 ° C. or lower, and devitrification of the arc tube of the lamp was hardly confirmed.

[0023]

According to the light source device of the present invention, a discharge lamp of which both ends are sealed, and one sealing portion of the discharge lamp is held at its neck, and the light emitted from the discharge lamp is emitted forward. A light source device having a hermetically-sealed structure that has a concave reflecting mirror and a front glass that covers the front surface of the concave reflecting mirror, and is used for horizontal lighting, and is cooled by an intake fan that is arranged apart from the light source device. Since the cooling mechanism is provided in combination with an air guide for locally blowing the wind on the outer surface of the concave reflecting mirror near the upper part of the discharge lamp, the maximum temperature of the concave reflecting mirror, and thus the emission of the discharge lamp The temperature at the top of the tube was able to be reduced significantly compared to the conventional light source device.

Further, by using the concave reflecting mirror made of crystallized glass, the maximum temperature of the concave reflecting mirror, and by extension, the upper temperature of the arc tube of the discharge lamp could be reliably lowered to a safe working temperature.

Further, by providing the concave reflecting mirror with cooling fins and doubling the heat transfer area of the high temperature portion of the reflecting mirror, the heat transfer amount by the cooling air is increased and the maximum temperature of the concave reflecting mirror is lowered. I was able to.

In the projector apparatus according to the present invention, a part of the cooling air from the intake fan arranged apart from the light source apparatus is locally blown to the outer surface of the concave reflecting mirror near the upper portion of the discharge tube of the discharge lamp. Efficient cooling is provided with a cooling mechanism that provides a wind guide passage to turn on, so the illuminance maintenance rate can be greatly improved compared to the conventional projector device that does not locally cool the concave reflecting mirror. .

[Brief description of drawings]

FIG. 1 shows a schematic view of a light source device of the present invention.

FIG. 2 shows a schematic view of a light source device of the present invention.

FIG. 3 shows a layout of a projector device of the present invention.

FIG. 4 shows a schematic view of a conventional light source device.

[Explanation of symbols]

1 discharge lamp 2 concave reflector 3 Front glass 4 air duct 5 cooling fins 6 integrator lens 7 Polarizing beam splitter 8 liquid crystal 9 Projection lens 10 light source device 11-color composite cross prism 12 lamp lighting device 13 intake fan 14 exhaust fan 15 Cooling air intake 21 neck 22 Lamp base 23 openings 100 projector device

Claims (4)

[Claims] 1. A discharge lamp of a both-end sealed type, a concave reflecting mirror which holds one sealing portion of the discharge lamp at a neck portion thereof, and emits light emitted from the discharge lamp toward a front side, A light source device having a closed structure, which has a front glass covering a front surface of a concave reflecting mirror and is used for horizontal lighting, wherein cooling air from an intake fan arranged apart from the light source device emits light from the discharge lamp. A light source device comprising a cooling mechanism provided with an air guide passage locally blown to the outer surface of the concave reflecting mirror adjacent to the upper part of the tube. 2. The light source device according to claim 1, wherein the concave reflecting mirror is made of crystallized glass. 3. The light source device according to claim 1, wherein a cooling fin is provided on an outer surface portion of the concave reflecting mirror adjacent to an upper portion of the discharge lamp of the discharge lamp. 4. A projector device using the light source device according to claim 1, wherein a part of the cooling air from the intake fan is in proximity to the upper portion of the arc tube of the discharge lamp. A projector device comprising a cooling mechanism provided with an air guide passage for locally blowing on an outer surface portion.