JP3498639B2 - Light source device and projector using the same - Google Patents

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 for a projector that projects video and character data on a screen and a projector using the same.

[0002]

2. Description of the Related Art In recent years, technological advances in projectors such as liquid crystal systems have made remarkable improvements in performance such as higher brightness, smaller size and lighter weight.

There has been a strong demand for higher brightness of a lamp which is a light source unit of a projection type video equipment such as a data projector and a projection TV. In recent years, compared with a conventional metal halide lamp which has been a mainstream until now, an arc region has been increased. Because of its small size and closeness to a point light source, ultra-high pressure mercury lamps with high light utilization efficiency have been put to practical use and are beginning to be mounted on various projectors.

The ultra-high pressure mercury lamp is designed to generate a high pressure inside the arc tube when the mercury enclosed in the arc tube is caused to emit light by arc discharge. It is designed to raise the overall brightness level and emit light in the visible wavelength range.

Therefore, the pressure is 150 to 2 at the time of lighting.
Since the pressure reaches about 100 atm, the arc tube made of transparent quartz glass is thicker than the metal halide lamp to withstand the internal pressure. Also, at the end of the lamp's life, there is a very high probability that the arc tube will be destroyed by thermal stress due to blackening and devitrification, and if the arc tube breaks, glass fragments and enclosed mercury will scatter inside the projector. To prevent this, an explosion-proof structure is provided by installing an explosion-proof glass in the front opening of the reflecting mirror.

[0006] Furthermore, the glass itself, which is the base material of the reflector, prevents the fragments of the arc tube and the fragments of the reflector from scattering outside due to the impact of the fragments of the arc tube colliding with the reflector. By making the plate thick and using crystallized glass having relatively high strength as the base material of the reflecting mirror, the reflecting mirror is made hard to break. For reflectors, mass productivity is good, the surface roughness of the inner surface of the reflective coating is excellent, and the heat resistance up to several hundred degrees from its condition of use and deformation at high temperatures impairs optical properties. Since it requires low thermal expansion, etc.,
Generally, glass is used as the base material.

[0007]

However, the arc tube of the ultra-high pressure mercury lamp is formed thick, and the internal temperature is originally high, and the internal temperature of the lamp unit is high due to the sealed structure of explosion-proof glass. However, in order to prevent the fragments of the lamp from scattering to the outside, the thickness of the reflector is increased, or the base material of the reflector is a crystallized glass with a large proportion of absorbing the radiant light of the lamp. The use of a lamp causes a further heat problem in which the heat radiated from the arc tube is further retained inside and the temperature of the entire interior of the lamp unit becomes high. In the case of metal halide lamps, it is possible to cool the arc tube directly with a fan, but in the case of ultra-high pressure mercury lamps, it is difficult due to the explosion-proof structure of the lamp unit, so it is extremely important to take measures against this heat problem. Has become.

When the temperature of the arc tube rises, the tips of a pair of electrodes made of tungsten melt and the shape and spacing of the electrodes change, and the melted tungsten is formed of transparent quartz glass. It adheres to the inner wall of the arc tube and its temperature rises due to radiant heat, resulting in blackening of the arc tube, which causes thermal stress destruction, and the temperature increase of the arc tube itself, which promotes crystallization of quartz glass. , Part of the arc tube is whitened, and the temperature of that part becomes higher due to radiant heat, resulting in devitrification of the arc tube that causes thermal stress destruction, and between the molybdenum foil and the lead wire at the side tube end of the arc tube. There is a problem that the welded part deteriorates due to oxidation.

Particularly for blackening and devitrification, the probability of destruction of the arc tube is increased, and from this point as well, it is necessary to lower the temperature inside the lamp unit in order to prevent destruction of the arc tube.

Also, regarding the reflecting mirror and the explosion-proof glass, when the temperature exceeds the allowable temperature exceeding the strain point or the transition point, distortion occurs in the temperature change process at the time of turning on and off, which leads to thermal stress destruction and vapor deposition. There is also a problem that peeling occurs due to a difference in coefficient of thermal expansion between the reflective film and the glass as the base material.

In view of the above problems, it is an object of the present invention to prevent the glass fragments and the enclosed mercury from breaking outside when the arc tube is damaged without raising the temperature inside the ultra-high pressure mercury lamp unit excessively. The structure to prevent the scattering of
It is provided at a low cost with a simple configuration.

[0012]

In order to solve this problem, a light source device of the present invention has an arc tube whose outer shape is made of glass and which emits light by discharge, and a curved surface which reflects the light to the front surface. , A concave reflecting mirror having glass as a base material and a reflecting film provided on the inner surface of the curved surface, and a transparent partition wall provided in the front opening of the reflecting mirror that seals the reflecting mirror and transmits the light reflected by the reflecting mirror. And a heat-resistant sheet or film-like scattering prevention means is provided on the outer wall surface of the curved surface of the reflecting mirror.

With this structure, when the arc tube is damaged, it is possible to prevent the broken pieces from scattering outside even if the reflecting mirror is damaged.

Further, the light source device of the present invention has a structure according to claim 1, which has a light-transmitting property for transmitting visible light or infrared light as the scattering preventing means.

With this structure, the scattering prevention means absorbs the radiant light emitted from the lamp, and the reflecting mirror 1
The temperature of the inner and outer walls of the curved surface 8 of the
It is possible to prevent the temperature of the entire lamp unit 9 including 0 from rising.

According to a fourth aspect of the present invention, the scattering prevention means is formed of silicon rubber, and the scattering prevention sheet is heat-shrinked to be brought into close contact with the outer wall surface of the reflecting mirror. It has the structure according to claim 1.

With this structure, since the scattering prevention means is not fixedly adhered to the reflecting mirror, the parts can be easily disassembled and the waste can be easily separated.

According to a ninth aspect of the invention, the light source device is provided in the vicinity of a ventilation port for inflow or outflow of cooling air for cooling the inside of the projector housing, and between the ventilation port and the light source device. It is characterized in that no scattering prevention means is provided.Since the scattering prevention means provided on the outside of the reflecting mirror does not scatter the glass outside the lamp unit, it does not scatter again between the light source device and the ventilation port. Since it is not necessary to provide an anti-filter (scattering prevention means), the cooling efficiency can be improved.

[0019]

BEST MODE FOR CARRYING OUT THE INVENTION First and second embodiments of a light source device of the present invention will be described below with reference to the drawings.

First, FIG. 1 is a perspective view of a light source device according to a first embodiment of the present invention as seen from the rear, FIG. 2 is an internal perspective view cut along a vertical section to show its internal structure, and FIG. FIG.

FIG. 4 is a vertical sectional view of a light source device according to the second embodiment of the present invention, and FIG. 5 is a schematic layout diagram of a projector using the light source device of the present invention.

First, the light source device according to the first embodiment of the present invention will be described with reference to FIGS.

In FIGS. 1, 2 and 3, the lamp unit 9 has a concave surface having a curved surface 8 such as an elliptical surface or a parabolic surface.
And a transparent explosion-proof glass 2 provided in the opening of the reflecting mirror 1 to seal the inside of the reflecting mirror 1.
And an ultra-high pressure mercury lamp 10 provided at the center of the optical axis inside the reflecting mirror 1.

The reflecting mirror 1 has a reflecting film 6 made of tantalum pentoxide, silicon dioxide or the like made of hard glass or Pyrex glass for reflecting the light of the ultra-high pressure mercury lamp 10 to the front opening. The inner wall surface of the curved surface 8 of the base material 7 is vapor-deposition coated, and after adjusting the ultra-high pressure mercury lamp 10 to the center position of the optical axis, it is fixed to the neck portion 12 by a filling adhesive 11 such as cement.

The ultra-high pressure mercury lamp 10 is an AC type discharge lamp and includes an arc tube 3 made of transparent quartz glass,
A pair of electrodes 14A and 14B formed of tungsten and facing each other along the optical axis direction with a certain distance, electrode lead-out lines 15A and 15B, and a base for connecting the electrode lead-out line 15A and a power supply. 13 and 13.

The inside of the arc tube 3 is an elliptic spherical closed space filled with mercury and a halogen gas, and the pair of electrodes 1 is provided at the center.
It is composed of a tube ball portion 4 in which 4A and 14B are arranged, and side tubes 5A and B for sealing both ends thereof.

On the outer wall surface of the curved surface 8 of the reflecting mirror 1, a shatterproof film 17 having heat resistance is provided on the optical axis from the tube end 16 on the side tube 5B side to the curved surface 8 of the reflecting mirror 1. A straight line extending in the vertical direction extends from the intersection point 20 where the outer wall surface of the reflecting mirror 1 intersects to the rear neck portion 12 of the reflecting mirror 1.
The curved surface 8 is provided all around the outer wall surface.

The shatterproof film 17 has a property of transmitting a part of visible light and infrared light, has adhesiveness on one entire surface, and is adhered to the outer wall surface of the curved surface 8 of the reflecting mirror 1. It is composed of a silicon-based adhesive layer 18 and a polyimide film 19 as a base material, and the upper limit of the heat resistant temperature is 25.
It is 0 ° C.

The operation and effect of the light source device according to the first embodiment of the present invention described above will be described below.

When arc discharge is caused between the electrodes 14A and 14B to cause the lamp to emit light, the vapor pressure of mercury and halogen gas rises as the temperature inside the bulb 4 rises, and the internal pressure of the bulb 4 rises. However, this internal pressure reaches about 150 to 200 atm in the equilibrium state at the time of lighting. Therefore, at the end of life of the lamp in which the arc tube 3 is blackened and devitrified, the internal pressure has a very high probability of the arc tube 3 being destroyed by thermal stress.

Even if the reflecting tube 1 is broken due to the impact when the arc tube 3 is damaged and the fragments of the arc tube 3 collide with the reflecting mirror 1, the anti-scattering film 17 is provided with the adhesive layer 1.
Since it is adhered to the outer wall surface of the reflecting mirror 1 by 8, even if the reflecting mirror 1 is disassembled into a plurality of glass pieces, the shatterproof film 17 does not impair the original shape of the reflecting mirror 1. It is possible to realize an excellent light source device in which the glass fragments of No. 3 do not scatter to the outside with a simple configuration.

Since the polyimide film 19 and the adhesive layer 18 of the shatterproof film 17 have sufficient heat resistance, they do not deteriorate even when the lamp is turned on for a long time, and the outer wall surface of the reflecting mirror is not deteriorated. There is no hindrance even if it is provided in the above, and since the anti-scattering film 17 has a light-transmitting property of transmitting visible light or infrared light, the anti-scattering film 17 can prevent the radiant light emitted from the lamp. It is possible to prevent the temperature of the inner and outer walls of the curved surface 8 of the reflecting mirror 1 from increasing due to absorption, and the temperature of the entire lamp unit 9 including the extra-high pressure mercury lamp 10 from increasing.

Further, as the angle at which the glass fragments of the arc tube 3 collide with the reflecting film 6 of the reflecting mirror 1 becomes more vertical, the impact energy that the glass fragments of the arc tube 3 give to the reflecting mirror 1 increases. Therefore, in the portion where the shatterproof film 17 is provided, the impact energy applied to the reflecting mirror 1 by the glass fragments of the arc tube 3 is significantly larger than in the portion where the shatterproof film 17 is not provided, and the reflecting mirror 1 Is the most likely place to break. Therefore, the reflector 1
Since the outer wall of the reflecting mirror 1 is not excessively covered with the anti-scattering film 17 up to the portion where the possibility of breakage is low, the temperature inside the lamp unit 9 is not excessively increased.

As a second embodiment of the present invention, since the shatterproof sheet 21 made of silicone rubber is heat-shrinked so as to be brought into close contact with the outer wall surface of the reflecting mirror 1, the reflecting mirror 1 should be prevented. Even if the glass breaks, the mirror 1 will not lose its original shape and the glass fragments of the arc tube 3 can be prevented from scattering to the outside, and the parts are disassembled because they are not fixed to the mirror 1 by adhesion. It is easy to carry out, and there is an advantage that waste can be separated easily.

Next, a projector using the light source device according to the first and second embodiments will be described with reference to FIG. In the projector 22 according to the present embodiment, the light beam from the lamp unit 9 is condensed by the illumination optical system unit 23 onto the light valve unit 24 having a liquid crystal panel, a DMD element, etc., and is irradiated onto a light valve (not shown). The image data formed in advance is enlarged and projected on the screen through the projection optical system unit 25. Further, in the cooling structure inside the projector 22, the cooling air sucked from the ventilation port 27 by the cooling fan 26 is blown to the entire power supply unit 28 and the lamp unit 9 to cool the power supply unit 28 and the lamp unit 9 to generate heat. The thermal energy is discharged from the ventilation port 30 by the cooling fan 29. Here, in order to improve the cooling efficiency, the lamp unit 9 is located in the vicinity of the ventilation port 30.
Has a structure in which a louver having a slit is obliquely provided with respect to the housing surface of the projector 22 so that the light emitted from the lamp unit 9 is difficult to see from the outside of the projector 22.

In the projector 22, even if the arc tube 3 is damaged, glass or the like does not scatter outside the lamp unit 9. Therefore, the arc tube 3 is provided between the lamp unit 9 and the ventilation port 30. Further, it is not necessary to provide a filter for preventing the glass fragments of the reflecting mirror 1 from scattering outside the projector 22.

Therefore, in the projector according to the embodiment of the present invention, the lamp unit 9 can be provided in the vicinity of the ventilation port 30 without providing the scattering prevention filter that increases the ventilation resistance. The cooling efficiency of the entire 22 can be improved.

As described above, by adopting the configuration of the light source device according to the first and second embodiments of the present invention, the temperature inside the extra-high pressure mercury lamp unit 10 is excessively increased. In addition to increasing the size of the projector 22 and increasing the noise level by enlarging the cooling fan 26 of the projector 22, if the arc tube 3 should be damaged, the glass fragments or enclosed glass may be enclosed. It is possible to realize a highly reliable light source device for a projector that prevents the generated mercury from scattering to the outside with a simple configuration and at a low cost.

[0039]

As described above, in the light source device of the present invention, the sheet or film-like scattering preventing means is provided on the outer wall surface of the curved surface of the reflecting mirror formed of glass, whereby the arc tube bursts, Even if the glass fragments of the arc tube collide with the inner surface of the reflecting mirror and the reflecting mirror is damaged, the scattering prevention means does not impair the original shape of the reflecting mirror, so the glass fragments of the arc tube do not scatter to the outside. The light source device can be realized with a simple configuration. Since the scattering prevention means has sufficient heat resistance, there is no problem even if it is provided on the outer wall surface of the reflecting mirror.

Further, since this scattering prevention means has a light-transmitting property of transmitting visible light or infrared light, the radiant light emitted from the lamp is absorbed and the temperature rises, thereby preventing scattering. The effect of preventing the temperature of the inner and outer walls of the reflecting mirror in the portion where the means is provided from increasing can be enhanced.

Further, since the entire surface on one side of the scattering prevention means has adhesiveness and is adhered to the outer wall surface of the reflecting mirror, when the reflecting mirror is broken, the reflecting mirror is disassembled into a plurality of glass pieces. , It is possible to improve the effect that it has a great effect of preventing the original shape of the reflecting mirror from being damaged.

Further, the scattering prevention means is made of silicone rubber, and the scattering prevention sheet is heat-shrinked,
Since it is closely attached to the outer wall surface of the reflecting mirror, if the reflecting mirror is broken, it has a large effect of preventing the reflecting mirror from being decomposed into multiple pieces of glass and spoiling the original shape of the reflecting mirror. In addition, it is easy to disassemble the parts because it is not adhesively fixed to the reflecting mirror, and there is an advantage that waste separation processing can be easily performed.

Further, a straight line extending from the front end of the arc tube toward the curved surface of the reflecting mirror in the direction perpendicular to the optical axis intersects with the outer wall surface of the reflecting mirror, and the outer wall portion behind the reflecting wall. However, since the impact energy given to the reflecting mirror by the glass fragments of the arc tube is the largest, and the possibility of breaking the reflecting mirror is the highest, the scattering prevention means should be installed in the rear of the reflecting mirror from the intersection position. By providing the entire outer wall surface, it is possible to obtain an effect that the outer wall of the reflecting mirror is not excessively covered with the scattering preventing means and the temperature inside the lamp unit is not excessively increased.

Further, even if the arc tube is damaged, glass or the like does not scatter to the outside of the lamp unit. Therefore, the lamp unit can be installed inside the projector housing without providing a scatter prevention filter that may increase ventilation resistance. Since it can be provided in the vicinity of the ventilation port for the inflow or outflow of the cooling air for cooling, the cooling efficiency of the entire lamp unit and the projector can be improved.

[Brief description of drawings]

FIG. 1 is a perspective view of a light source device according to a first embodiment of the present invention.

FIG. 2 is an internal perspective view cut along a vertical section to show the internal configuration.

FIG. 3 is a vertical sectional view of the light source device.

FIG. 4 is a vertical sectional view of a light source device according to a second embodiment of the present invention.

FIG. 5 is a schematic layout diagram of a projector using the light source device of the present invention.

[Explanation of symbols]

1 --- Reflector 2 --- Explosion-proof glass 3 --- Arc tube 4 --- Tube 8 --- Curved surface 9 --- Lamp unit 10 --- Ultra high pressure mercury lamp 12 --- Neck 13 --- 16 --- Tube end 17 --- Shatterproof film 20 --- Intersection position

─────────────────────────────────────────────────── ─── Continuation of front page (72) Inventor Takeharu Tsutsumi 1006 Kadoma, Kadoma City, Osaka Prefecture Matsushita Electric Industrial Co., Ltd. (72) Toru Sekiguchi 1006 Kadoma, Kadoma City, Osaka Matsushita Electric Industrial Co., Ltd. Company (72) Inventor Mitsuhiro Wada 1006 Kadoma, Kadoma City, Osaka Prefecture Matsushita Electric Industrial Co., Ltd. (56) Reference JP 2000-47327 (JP, A) (58) Fields investigated (Int.Cl. ⁷ , DB name) G03B 21/00-21/30 F21M 1/00-15/00

Claims (5)

(57) [Claims] 1. A discharge lamp having an arc tube whose outer shape is made of glass and which emits light by discharge, and a curved surface which reflects the light of the arc tube to the front surface, and a reflective film is provided on the inner surface of the curved surface. And a concave reflecting mirror having glass as a base material, and a transparent partition wall provided in the reflecting mirror front opening that seals the reflecting mirror and transmits the light reflected by the reflecting mirror. The film-like scattering prevention means is the above-mentioned arc tube.
From the tube end on the front side of the curved surface of the reflecting mirror,
The straight line extending in the direction perpendicular to the optical axis is the outer wall surface of the reflecting mirror.
The maximum position is the position where the
A light source device provided on the entire outer wall surface of the reflecting mirror . 2. Light emission due to discharge whose outer shape is made of glass
A discharge lamp having a light emitting tube, and a curved surface that reflects the light of the light emitting tube to the front surface.
Concave type whose base material is glass with a reflective film on the inner surface of the curved surface
And the light reflected by the reflecting mirror while sealing the reflecting mirror and
And a transparent partition wall provided in the front opening of the reflecting mirror.
And the film-like scattering prevention means having adhesiveness is provided in the reflecting mirror.
Light source device characterized by being adhered to the outer wall surface of the . 3. Light emission by discharge whose outer shape is made of glass
A discharge lamp that has an arc tube that
Has a curved surface that reflects on the surface, and a reflective film on the inner surface of the curved surface.
Concave type reflecting mirror having glass as a base material, and light reflected by the reflecting mirror while sealing the reflecting mirror.
And a transparent partition wall provided in the front opening of the reflecting mirror.
And has a shatterproof means that is made of a silicone rubber sheet and heat-shrinks
By making it adhere to the outer wall surface of the reflecting mirror.
Light source and wherein the. 4. The scattering prevention means is visible light or infrared light.
2. A light-transmitting material that transmits light.
The light source device according to any one of claims 1 to 3 . 5. A light source device according to any one of claims 1 to 4 is provided.
projector.