JP4090282B2 - Cooling device for light source device - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a light source for efficiently cooling a light source device that irradiates the illumination light in a projection video apparatus that enlarges and projects an image modulated into a video signal on a light valve onto a screen through a projection lens with illumination light. The present invention relates to a cooling device for the apparatus.
[0002]
[Prior art]
Basically, the projection type video apparatus is composed of a lamp light source unit, a light valve such as a liquid crystal panel that modulates light according to image information, and white light from the light source is separated into red, blue, and green to produce the light. An optical unit that irradiates the bulb and color-synthesizes the light emitted from the light bulb, and a projection optical unit that enlarges and projects the color-synthesized light are provided.
[0003]
FIG. 7 shows an example of a conventional projection type video apparatus. This projection-type image device is an image device using a reflection-type image element, and includes a lamp light source unit 1 as a light source, a relay lens unit 2 for condensing light from the lamp light source unit 1, and a relay lens unit 2. A light introduction mirror 3 and a TIR (Total Inner Reflecting) prism 4 for guiding the condensed light in a desired direction, a color separation / color synthesis prism 5 for color separation and color synthesis of light, and an optical image A reflection type image element 6 (6a, 6b, 6c) for generating information and a projection lens unit 7 for enlarging and projecting image information synthesized by the color separation / color synthesis prism 5 are provided. In order to simplify the explanation, it is shown two-dimensionally, but actually, the incident optical path to the reflective image element 6 is orthogonal to the outgoing optical path from the reflective image element 6.
[0004]
Specifically, the lamp light source unit 1 includes a discharge lamp 101 and a concave mirror 102 for efficiently condensing in a high-luminance video apparatus. The TIR prism 4 is composed of two prisms, and a very thin air layer is formed on the boundary surface between them. As a result, the light from the discharge lamp 101 is collected to some extent by the concave mirror 102 and further collected by the relay lens unit 2, and then to the TIR prism 4 by the light introduction mirror 3, which is larger than the critical angle with respect to the prism boundary surface. The light is incident at an angle, totally reflected, and guided to the color separation / color synthesis prism 5.
[0005]
The color separation / color combining prism 5 has a dichroic film on the prism end face, and the light from the TIR prism 4 is decomposed into three primary colors of red, green, and blue by the incident angle and dichroic film characteristics. The light is guided to the reflection type image elements 6a, 6b, 6c corresponding to the respective primary color lights. The light of each color is modulated and reflected by the respective video signals in the reflection type image elements 6 a, 6 b, 6 c, is incident again on the color separation / color synthesis prism 5, is color-combined and emitted, and passes through the TIR prism 4. Then, the projection lens unit 7 enlarges and projects it onto a screen (not shown).
[0006]
In recent projection-type video apparatuses, a high-resolution display element (video element) is used to project image information more clearly, and at the same time, high brightness and miniaturization for brightening a projection screen are promoted. As a display element, a liquid crystal device, a DMD (Digital Mirror Device) element constituted by a micro-mirror, and a TMA (Thin_Film Micromirror Array) element have been commercialized or announced. As the light source, a discharge lamp sealed with mercury or the like is used.
[0007]
Here, the discharge lamp needs an appropriate temperature of, for example, a lamp tube temperature of about 850 ° C. to 1000 ° C. from the relationship of luminous efficiency and electrode life. On the other hand, the reflector such as the concave mirror that condenses and reflects the light of the discharge lamp is configured so that the infrared rays in the light of the discharge lamp are transmitted from the reflection film. Therefore, the back surface of the reflector and the lamp house in which the reflector is fixed. Becomes hot and the surrounding air becomes hot. For this reason, in order to cool a discharge lamp, the structure provided with the ventilation fan which ventilates to a lamp | ramp part, and the exhaust fan for exhausting the air heated up by the lamp | ramp part is common.
[0008]
FIG. 8 shows a lamp light source unit of a small projection type video apparatus. A reflector 11 for condensing and reflecting the light from the discharge lamp 10, a lamp holder 12 for fixing the discharge lamp 10 to the reflector 11, and a translucent light disposed in front of the discharge lamp 10 in the reflection direction from the reflector 11. The glass 11 and the lamp house 14 for fixing the reflector 11 and the translucent glass 13 are provided.
[0009]
As a cooling means, an exhaust cooling fan 15 is arranged on the back side of the reflector 11, and a second cooling fan (not shown) for blowing is arranged in front of the reflector 11, for example, In the technology disclosed in Japanese Laid-Open Patent Publication No. 05-004147, air is sucked so as to flow along the liquid crystal panel by the second cooling fan and is sent to the back side of the reflector 11, and the high-temperature air on the back side is exhausted by the cooling fan 15. Like to do.
[0010]
In Japanese Patent Laid-Open No. 2001-125195, an air blowing outlet is provided between a reflector and a light-transmitting glass, an air exhaust hole is provided in a lamp sealing portion, and the cold air from a cooling fan attached to a lamp house is supplied by the air blowing. There is also disclosed a technique in which a discharge lamp is cooled by providing a wind guide path for leading to a blowout port and passing cool air through a flow path constituted by these.
[0011]
[Problems to be solved by the invention]
However, the former cooling structure described above requires at least two cooling fans for cooling the discharge lamp 10 and is not suitable for downsizing, and the cooling fan 15 is disposed near the reflector 11. The heat from the reflector 11 is received directly. However, the output of the discharge lamp 10 tends to increase in order to cope with higher brightness, and the amount of heat on the back surface of the reflector 11 increases accordingly, so the heat load on the cooling fan 15 increases. For this reason, it is necessary to provide a slit-like blind on the suction side of the cooling fan 15 or to make the material of the cooling fan 15 heat resistant, which causes noise in the blind and increases costs.
[0012]
In the latter cooling structure, since the cooling fan is not disposed near the reflector, there is no problem of heat load, but a cooling structure that can cope with further increase in brightness and increase in output of the discharge lamp is a problem.
[0013]
SUMMARY OF THE INVENTION An object of the present invention is to provide a cooling device for a light source device that has a simple structure and can cope with high luminance and has high reliability.
[0014]
[Means for Solving the Problems]
In order to solve the above problems, the invention according to claim 1 is directed to a discharge lamp, a reflector that reflects light from the discharge lamp, a lamp holder that fixes the discharge lamp to the reflector, and a reflection direction from the reflector. A cooling device for a light source device comprising at least a translucent glass disposed in front of a discharge lamp, and a lamp house in which the reflector and the translucent glass are fixed. A first blower opening that is separated into a chamber and opened in one chamber on the reflection surface side of the reflector, a ventilation port that opens the two chambers in communication with the lamp holder, and a rear chamber on the back side of the reflector. a second air duct and exhaust port openings opposite each other, an opening to face the first air duct in one room of the reflecting surface of the reflector And a third blower port, is introduced into the lamp house air blowing from the cooling fan through the first and second and third air duct, characterized in that it is configured to exhaust through the exhaust port . According to this configuration, the discharge lamp, the reflector, and the lamp house can be efficiently cooled, and the cooling fan is also disposed on the air blowing side, so that it is not exposed to high temperatures and does not need to be heat resistant. The bearing life is also greatly improved, so that a highly reliable cooling device can be realized. In addition, a single cooling fan can be introduced into the lamp house through the first, second, and third blower ports and exhausted through the exhaust port, thereby reducing the size of the entire light source device. In addition, the discharge lamp can be cooled from both the upper and lower directions, and the vertical temperature distribution of the discharge lamp can be made uniform regardless of the installation state of the projection type video apparatus (floor mounting or ceiling suspension).
[0015]
The invention according to claim 2 is the cooling device for the light source device according to claim 1, further comprising an air duct for simultaneously introducing the air from the cooling fan to the first, second and third air outlets. The opening area of each of the first air outlet, the second air outlet, the third air outlet, and the air outlet satisfies the relationship of the first air outlet = the third air outlet <the second air outlet <the exhaust outlet. It is characterized by being formed, and a single cooling fan can realize a smooth air flow that blows into the lamp house through the first, second, and third blower ports and exhausts through the exhaust port. This makes it possible to reduce the size of the entire light source device, to equalize the amount of air blown from each of the first air blowing port and the third air blowing port, and to facilitate lamp cooling control. .
[0018]
According to a third aspect of the present invention, there is provided the cooling device for a light source device according to the first or second aspect , wherein at least one of the first air outlet and the third air outlet has a bulb portion of a discharge lamp. It is characterized in that a blower guide for guiding the air flow toward is provided. By controlling the blow direction with the blower guide, it is possible to finely adjust the temperature of the discharge lamp.
[0019]
DETAILED DESCRIPTION OF THE INVENTION
Embodiments of the present invention will be described below with reference to the drawings.
(Embodiment 1)
FIG. 1 shows a lamp light source unit provided with a cooling device according to Embodiment 1 of the present invention. This light source unit is provided in a small projection-type image device as previously described with reference to FIG. 7, and has substantially the same configuration as the conventional lamp light source unit described with reference to FIG. Therefore, the same reference numerals as those in FIG.
[0020]
In FIG. 1, the light source unit includes a discharge lamp 10, a reflector 11 that collects and reflects light from the discharge lamp 10, a lamp holder 12 that fixes the discharge lamp 10 to the reflector 11, and a discharge lamp in the reflection direction from the reflector 11. The translucent glass 13 distribute | arranged ahead, and the lamp house 14 for fixing the reflector 11 and the translucent glass 13 are provided.
[0021]
Specifically, the discharge lamp 10 is a discharge type lamp light source having a cathode and an anode sealed with mercury or the like, and has a tube portion 10a and an electrode sealing portion 10b, and is ignited by a high-voltage power source (not shown). Is possible. The reflector 11 has a substantially cone shape, and a reflective film 11a is applied to a concave surface arranged on the light irradiation side by vapor deposition of a metal material or the like, and has a light reflection function and a transmission function to transmit infrared rays backward. ing.
[0022]
The lamp holder 12 has a bottomed cylindrical shape, holds the electrode sealing portion 10b of the discharge lamp 10 at the axial center position by fitting or the like, and fixes the inner peripheral portion of the reflector 11 to the opening end portion with an adhesive or the like. In addition, the position is regulated so as to optimize the light reflection by the reflector 11. The translucent glass 13 is for preventing each lamp member from scattering when the discharge lamp 10 is ruptured. The translucent glass 13 has a thickness of several millimeters and is strong enough to withstand explosion-proof, together with the reflector 11. It arrange | positions so that the whole discharge lamp 10 may be enclosed, and is being fixed to the lamp house 14 with the screw | thread etc. FIG.
[0023]
The lamp house 14 is divided into two chambers with the reflector 11 as a boundary, and a first chamber for cooling the lamp is disposed at one chamber on the reflecting surface side of the reflector 11 (hereinafter referred to as the front chamber) and at the upper portion of the reflector 11. The blower opening 16 is opened. In addition, a second air blowing port 17 for cooling the rear of the reflector is opened in one chamber on the back side of the reflector 11 (hereinafter referred to as a rear chamber) and in the upper part of the lamp holder 12. An exhaust port 18 is opened at a substantially opposite position. The lamp holder 12 has a vent 19 that communicates the two chambers.
[0024]
According to the above configuration, when the cooling air is blown to the air blowing ports 16 and 17 by the cooling fan (not shown), the cooling air to the air blowing port 16 flows into the front chamber, and accordingly, around the discharge lamp 10. The front room air such as the above flows into the gap between the electrode sealing part 10b of the discharge lamp 10 and the reflector 11, and is sent to the rear room through the ventilation opening 19, whereby the discharge lamp 10 (tube part 10a, electrode seal) The stop 10b) is cooled, and the reflector 11 and the like are also cooled. Further, the cooling air to the blower port 17 flows into the rear chamber, and accordingly, the rear chamber air such as around the reflector 11 flows toward the exhaust port 18 and is exhausted from the exhaust port 18, thereby the reflector 11 and the like. Is cooled.
[0025]
In this manner, the discharge lamp 10, the reflector 11, and the lamp house 14 can be cooled and adjusted to a prescribed temperature.
(Embodiment 2)
FIG. 2 shows a lamp light source unit including a cooling device according to Embodiment 2 of the present invention.
[0026]
This light source unit has the same configuration as that of the first embodiment described above, except that a blower duct 20 communicating with the blower ports 16 and 17 is provided in the upper part of the lamp house 14. ing. For this reason, in this light source unit, it is possible to simultaneously blow air to the air outlets 16 and 17 through the air duct 20 by one cooling fan (not shown). Each of the air blowing port 16, the air blowing port 17, and the exhaust port 18 is formed so that the opening area satisfies the relationship of the air blowing port 16 <the air blowing port 17 <the exhaust port 18.
[0027]
Here, the gap between the electrode sealing portion 10a of the discharge lamp 10 and the inner peripheral portion of the reflector 11 is small, so that the pressure loss is large, and the flow rate of air passing therethrough is small because the blower port 16 is small. On the other hand, the opening area of the exhaust port 18 is large as described above, and since the lamp holder 12 is only positioned between the blower port 17 and the exhaust port 18, there is no large pressure loss. The air blown into the blower duct 20 almost flows in from the blower port 17 and flows to the exhaust port 18 because it may be referred to as the port 17.
[0028]
Therefore, in the front chamber and the rear chamber with the reflector 11 as a boundary, the pressure in the front chamber is higher than that in the rear chamber, and in the gap between the electrode sealing portion 10b of the discharge lamp 10 and the inner peripheral portion of the reflector 11. Ventilation as indicated by arrows is possible, and air does not stay in the vicinity of the discharge lamp 10.
[0029]
Therefore, the discharge lamp 10, the reflector 11, and the lamp house 14 can be cooled and adjusted to a prescribed temperature by a single cooling fan, and the light source unit can be downsized.
(Embodiment 3)
FIG. 3 shows a lamp light source unit including a cooling device according to Embodiment 3 of the present invention.
[0030]
This light source unit has the same configuration as that of the second embodiment described above, but is one chamber (front chamber) on the reflecting surface side of the reflector 11 in the lamp house 14, which is below the reflector 11, and A difference is that a third air blowing port 21 for cooling the lamp is opened at a position substantially opposite to the air blowing port 16, and an air duct 22 communicating with the air blowing port 21 and the air blowing duct 20 is provided. . The ventilation openings 16 and 21 have an equivalent opening area.
[0031]
For this reason, even in this light source unit, air can be simultaneously blown to the air blowing ports 16, 17, and 21 through the air ducts 20 and 22 by a single cooling fan (not shown). The discharge lamp 10 can be cooled from both the upper and lower directions, and the vertical temperature distribution of the discharge lamp 10 can be made uniform regardless of the installation state of the projection type video apparatus (floor mounting or ceiling suspension).
[0032]
Note that, in the front chamber and the rear chamber with the reflector 11 as a boundary, the pressure in the front chamber is higher than that in the rear chamber in the same manner as in the above-described second embodiment, so that the electrode sealing portion 10b of the discharge lamp 10 Ventilation as indicated by an arrow is possible in the gap with the inner peripheral portion of the reflector 11.
(Embodiment 4)
FIG. 4 shows a lamp light source unit provided with a cooling device according to Embodiment 4 of the present invention.
[0033]
This light source unit has substantially the same configuration as that of the second embodiment described above, but is a front chamber having the reflector 11 as a boundary, and is provided in the first air outlet 16 that opens to the top of the reflector 11. The difference is that a blowing guide 23 for guiding the blowing toward the tube portion 10a of the discharge lamp 10 is provided.
[0034]
By this air blowing guide 23, the cooling air from the air duct 20 is forcibly blown in the direction of the tube portion 10a, and the tube portion 10a is efficiently cooled.
Here, the temperature of the bulb portion 10a of the discharge lamp 10 greatly contributes to the performance of the light source lamp. If the temperature is lower than the specified temperature, the mercury evaporation pressure is low and sufficient luminance cannot be obtained. In addition to shortening the electrode life, in extreme cases, there is a risk of explosion. In a tube portion 10a of a general discharge lamp 10, an upper temperature of about 950 ° C. to 1000 ° C. and a lower temperature of about 800 to 850 ° C. are optimal. In order to finely adjust the temperature in this way, it is important to control not only the flow rate from the blower opening 16 but also the blowing direction with the blower guide 23.
[0035]
FIG. 5 shows an example of the air blowing guide 23. The air blowing guide 23 is formed integrally with a mesh body 24 of an appropriate size. When the mesh body 24 is disposed so as to cover the air blowing port 16 and fixed to the lamp house 14 by bonding or caulking, the air blowing guide 23 is provided. The guide 23 is arranged in an oblique direction toward the tube portion 10a. The mesh body 24 prevents fragments from being scattered outside the lamp house 14 when the discharge lamp 10 is ruptured.
[0036]
In FIG. 6, the temperature of the upper part of the lamp | ramp tube part 10a in the state with the presence or absence of the ventilation guide 23 and the mesh body 24, and the lower part is shown. It can be seen from FIG. 6 that by providing the air blowing guide 23, the lamp tube temperature can be optimized regardless of the presence or absence of the mesh body 24.
[0037]
It is obvious that the same effect can be obtained even if the air guide 23 is provided in the third air outlet 21 that opens in the lower part of the reflector 11 as shown in the third embodiment. It is also possible to apply to the structure of Embodiment 1 and Embodiment 3.
[0038]
【The invention's effect】
As described above, according to the present invention, the lamp house is divided into two chambers with the reflector as a boundary, and the first air outlet and the first air outlet are opened in one chamber on the reflecting surface side of the reflector . 3 vents are provided, a vent hole communicating the two chambers is provided in the lamp holder, a second air vent and an exhaust port are formed in one chamber on the back side of the reflector, and cooling air from the cooling fan is Since air is blown into the lamp house through the first, second, and third air outlets and exhausted through the exhaust port, the discharge lamp, the reflector, and the lamp house are made efficient by a single cooling fan while having a simple structure. Cooling can be performed well, and the life of the bearings can be greatly improved without using a heat-resistant cooling fan. Therefore, a highly reliable cooling device can be realized, and the entire light source device can be reduced in size and price.
[Brief description of the drawings]
FIG. 1 is a cross-sectional view showing a configuration of a cooling device for a light source device according to Embodiment 1 of the present invention. FIG. 2 is a cross-sectional view showing a configuration of a cooling device for a light source device according to Embodiment 2 of the present invention. 3 is a cross-sectional view showing a configuration of a cooling device for a light source device according to Embodiment 3 of the present invention. FIG. 4 is a cross-sectional view showing a configuration of a cooling device for a light source device according to Embodiment 4 of the present invention. FIG. 6 is a perspective view showing an air blowing guide constituting the cooling device of FIG. 4. FIG. 6 is a graph showing the effect of the air blowing guide in the cooling device of FIG. 4. FIG. FIG. 8 is a cross-sectional view showing the configuration of a cooling device for a conventional light source device.
10 Discharge lamp
10a Tube part
11 Reflector
12 Lamp holder
13 Translucent glass
14 Lamphouse
16 First air vent
17 Second air vent
18 Exhaust vent
19 Ventilation holes
20 Air duct
21 3rd air vent
22 Air duct
23 Air guide

Claims (3)

A discharge lamp, a reflector that reflects light from the discharge lamp, a lamp holder that fixes the discharge lamp to the reflector, a translucent glass disposed in front of the discharge lamp in the direction of reflection from the reflector, and the A cooling device for a light source device comprising at least a lamp house in which a reflector and translucent glass are fixed,
The lamp house is separated into two rooms with a reflector as a boundary,
A first blower opening opened in one chamber on the reflection surface side of the reflector, a ventilation opening opened in communication with the two chambers to the lamp holder, and an opening facing one chamber on the back side of the reflector The second air outlet and the exhaust port, and a third air outlet opened in one chamber on the reflecting surface side of the reflector so as to face the first air outlet ,
A cooling device for a light source device configured to introduce air from a cooling fan into the lamp house through the first, second, and third air outlets and exhaust the air through an air outlet. It has an air duct for introducing air from the cooling fan into the first, second and third air outlets at the same time, and the first air outlet, the second air outlet, the third air outlet and the exhaust outlet are 2. The cooling device for a light source device according to claim 1, wherein each of the opening areas is formed so as to satisfy a relationship of first air outlet = third air outlet <second air outlet <exhaust port. 3. The light source device according to claim 1, wherein an air blowing guide that guides cold air toward a tube portion of the discharge lamp is provided in at least one of the first air blowing port and the third air blowing port. Cooling system.

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