JP2002352604A - Light source device, lamp unit and projector - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a light source device surely preventing scattering broken pieces when a light source lamp explodes while cooling is enhanced and enhancing workability in replacement, and provide a lamp unit and a projector. SOLUTION: The light source lamp 1 has ventilation ports 31, 44 formed in a recessed reflector 2 fit to the inside, and the ventilation ports 31, 44 are blocked with shutter mechanisms 40, 50 driven by the wind pressure caused by an air blast when the light source lamp explodes.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

[0001] 1. Field of the Invention [0002] The present invention relates to a light source device, a lamp unit, and a projector used as a light source of, for example, a projector.

[0002]

2. Description of the Related Art Hitherto, a light source device composed of a high-pressure discharge lamp such as a metal halide lamp or an ultra-high pressure mercury lamp has been used as a light source device of this kind. Because of this, the light source device is usually provided with a technique for preventing the fragments at the time of the explosion from scattering. For example, there is an apparatus in which an explosion-proof glass plate is attached to the front of a reflector that reflects light from a light source lamp, and the periphery of the light source lamp is sealed with a reflector and explosion-proof glass.

[0003]

By the way, the light source lamp becomes hot during operation, and if the high temperature state continues, the performance and life of the lamp are adversely affected. Therefore, it is necessary to cool the light source lamp. However, it was difficult to sufficiently cool the above-described closed structure.

[0004] In recent years, there has been a device in which a high temperature is suppressed while taking a sealed structure. However, this type of light source device is mechanically bulky, and the overall configuration is often large. In response to the demand for smaller and lighter projectors, there has been no effective light source device itself, despite the strong demand for smaller and lighter projectors.

[0005] For this reason, a technique for preventing scattering and improving cooling efficiency without using a closed structure is disclosed in Japanese Patent Laid-Open No. 5-119.
No. 400 discloses this. FIG. 8 is a diagram showing this device. The apparatus shown in FIG. 8 accommodates a lamp 201 and a reflector 202 in a box 203, which is provided with a valve mechanism 204 that automatically opens and closes according to a change in internal pressure, and a valve mechanism on the bottom side of the box 203. A fan 205 is provided so as to be opposed to 204, cooling air from the fan 205 is introduced into the box 203 through the valve mechanism 204 to cool the lamp 201, and the warmed air in the box 203 is supplied to the other side. Valve mechanism 20
4 to be discharged. In FIG. 8, reference numeral 206 denotes an explosion-proof glass for preventing scattering when the lamp explodes.

However, in this technique, the fan 20
In some cases, the valve mechanism 204 may be closed by the cooling air from No. 5, and the expected cooling effect could not be obtained.

When the light source lamp explodes, it is replaced with a new light source device. In the conventional structure shown in FIG. 8, the valve mechanism 204 is open at the time of replacement. Debris at the time of the explosion fell from the mechanism 204, and the fallen object caused an injury, and the work of removing the fallen object was required.

SUMMARY OF THE INVENTION The present invention has been made in view of the above points, and a light source device which can surely prevent the debris from being scattered at the time of explosion of a light source lamp while improving cooling performance and which is excellent in workability at the time of replacement. , A lamp unit and a projector.

[0009]

SUMMARY OF THE INVENTION A light source device according to the present invention comprises a concave reflector having a plurality of ventilation holes formed therein and a light source lamp mounted therein, an explosion-proof glass disposed in front of the reflector, and a light source. A shutter mechanism is provided for closing each of the vents by the wind pressure generated by the blast when the lamp explodes.

Further, the light source device according to the present invention has a plurality of vents formed therein, a concave reflector in which the light source lamp is mounted, an explosion-proof glass disposed in front of the reflector, and an explosion-proof glass for the light source lamp. A detecting mechanism for detecting the explosion of the light source lamp, and a shutter mechanism for closing each of the vents when the detecting means detects the explosion of the light source lamp.

According to these inventions, when the light source lamp explodes, each vent is closed by the shutter mechanism.
Debris scattering can be reliably prevented. Further, since the shutter mechanism is provided in the light source device, when exchanging the light source device, debris does not spill out from each of the vents, and the replacement operation can be performed safely and efficiently.

[0012] Further, in the light source device according to the present invention, the ventilation port may include a rear ventilation port provided at a central portion of the reflector;
And a front vent provided near the opening of the reflector.

According to the present invention, since the ventilation holes provided in the reflector are provided on the front side and the rear side of the reflector, the ventilation is efficiently performed, and the cooling efficiency can be increased.

Further, in the light source device according to the present invention, the shutter mechanism for closing the front vent is provided so as not to block the light beam emitted by the light source lamp and reflected forward by the reflector. It is.

According to the present invention, since the light emitted from the light source lamp and reflected forward by the reflector is not blocked by the shutter mechanism for closing the front vent, the light emitted from the light source is not blocked. It is possible to obtain a light source device exhibiting the above-mentioned effects without lowering the utilization efficiency.

Further, in the light source device according to the present invention, a shutter mechanism for opening and closing the rear vent is disposed on the outer peripheral portion of the light source lamp mounting cylindrical portion of the reflector.

According to the present invention, the outer peripheral portion of the light source lamp mounting cylindrical portion of the reflector is a space that has been wasted without being used particularly when the light source device is mounted on the lamp housing. By providing the shutter mechanism, it is possible to obtain a light source device exhibiting the above effects without increasing the size of the entire light source device.

In the light source device according to the present invention, a fan is provided in the vicinity of the front vent provided on the side surface of the reflector, and the fan is blown from the front vent to the rear vent. It is.

According to the present invention, the cooling air from the fan is effectively blown to the entire internal space of the reflector, and the cooling efficiency can be improved.

Further, the light source device according to the present invention includes a concave reflector in which a plurality of ventilation holes are formed, in which a light source lamp is mounted, and an explosion-proof glass disposed in front of the reflector. In a light source device mounted in a lamp housing provided with scattering prevention means for preventing scattering from each ventilation hole, the light source device is provided so as to cover each of the ventilation holes, and the temperature change of the internal space of the reflector is provided. The vent hole is opened when the temperature of the light source lamp is high due to the heat of the light source lamp, and is closed when the temperature is low due to the bimetal plate.

According to the present invention, the scattering of the debris due to the explosion of the light source lamp can be prevented by the scattering prevention means provided in the lamp housing, and when the light source lamp is turned on, the vent is opened by deformation of the bimetal plate. At the time of replacement of the light source device after the explosion of the light source lamp, since the vent is closed by the bimetal plate, debris does not spill out of the vent and the replacement operation can be performed safely and efficiently.

Further, in the light source device according to the present invention, the scattering prevention means is a shutter which closes the vent when the explosion of the light source lamp is detected by the detection means for detecting the explosion of the light source lamp.

According to the present invention, the scattering prevention means can be a shutter for closing the vent when the explosion of the light source lamp is detected by the detection means for detecting the explosion of the light source lamp. Can be reliably prevented from being scattered from the air vent.

Further, in the light source device according to the present invention, the detecting means detects a change in current or voltage supplied to the light source lamp to detect an explosion of the light source lamp.

Further, in the light source device according to the present invention, a fan is provided near the ventilation port.

According to the present invention, since the fan is provided near the ventilation port, the cooling air is forcibly introduced into the internal space of the reflector, and the cooling efficiency can be further improved.

A lamp unit according to the present invention includes any one of the light source devices described above, and a lamp housing that houses the light source device.

According to the present invention, by providing any one of the above light source devices, it is possible to reliably prevent the debris from being scattered when the light source lamp explodes while improving the cooling efficiency, and furthermore to provide excellent workability at the time of replacement. A lamp unit can be provided.

Further, a projector according to the present invention includes any one of the light source devices described above.

According to the present invention, by providing any one of the above light source devices, it is possible to reliably prevent the debris from being scattered at the time of explosion of the light source lamp while improving the cooling efficiency, and to further improve the workability at the time of replacement. A projector can be provided.

[0031]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiment 1 1 and 2 are views showing a light source device 60 according to Embodiment 1 of the present invention.
2 shows a state when the light source lamp is turned on, and FIG. 2 shows a state after the light source lamp explodes. In both figures, (a) is a rear view, and (b) is a cross-sectional view taken along aa of (a). . In the following description, the explosion-proof glass 3 side will be referred to as “front” and the light source lamp mounting cylinder 43 side as “rear” in FIGS. 1 (b) and 2 (b). Further, a case where the light source device of the present invention is applied to a projector will be described as an example.

The light source device 60 includes the light source lamp 1, the reflector 2, the explosion-proof glass 3, and the shutter mechanisms 40 and 50 for closing the ventilation holes 31 and 44 provided on the front and rear of the reflector 2, respectively. It has a configuration provided.

The light source lamp 1 is constituted by a high-pressure discharge lamp such as a metal hydride lamp or a high-pressure mercury lamp.

The reflector 2 is composed of a parabolic mirror having a concave inner surface, and reflects light from the light source lamp 1 to reflect light from the light source lamp 1 (the central axis of a light beam emitted from the light source device 60) 10ax.
And has a function of emitting a light beam substantially parallel to the light beam. The inner surface shape of the reflector 2 is not limited to a parabolic mirror, but may be an elliptical shape.

The explosion-proof glass 3 is disposed in front of the reflector 2 to prevent the debris from scattering when the light source lamp 1 explodes.

In the reflector 2, upper and lower side surfaces include
Vertical portions 2a extending outward are provided, and a gap between each vertical portion 2a and the explosion-proof glass 3 forms a ventilation hole (front side ventilation hole) 31.

Although not shown in FIG. 1, cooling fans are respectively arranged above and below the reflector 2 so as to face the ventilation holes 31.
Cooling air is introduced into the internal space of the reflector 2 in the direction of the dotted arrow in the figure to cool the light source lamp 1, and warm air in the internal space of the reflector 2 is ventilated at the rear of the reflector 2. It is configured to be discharged out of the reflector 2 through the port 44. The installation position and the number of fans are not limited to those described above. For example, only one fan may be provided below the reflector 2.

Each of the vertical portions 2a is provided with a shutter mechanism 40 for closing each of the vents 31 by a blast when the light source lamp 1 explodes.

The shutter mechanism 40 is composed of a pin 41 provided at the tip of the vertical portion 2a of the reflector 2 and a rotating member 42 provided rotatably about the pin 41 as a fulcrum. As shown in FIG.
2 is located on the inner space side of the reflector 2 to open the ventilation port 31, and when the light source lamp 1 explodes, the direction of the dotted arrow shown in the reflector 2 of FIG. Due to the wind pressure generated by the blast flowing through the explosion-proof glass 3, the tip 41 a of the pivoting member 42 is pivoted about the pin 41 as a fulcrum in the direction of arrow A (see FIG. 1B).
The vent 31 is closed by being locked to a locking portion 3a extending rearward from the side.

In the shutter mechanism 40, the rotating member 42 is not rotated by the cooling air from the fan (not shown), and the cooling air is reliably supplied to the internal space of the reflector 2 when the light source lamp 1 is turned on. It can be introduced to.

The reason why the shutter mechanism 40 is provided in the vertical portion 2a is to prevent the light beam reflected by the reflector 2 from being blocked when the light beam is irradiated forward. .

The reflector 2 has a light source lamp mounting cylinder 43 extending outward (rearward) at the center thereof, and the light source lamp 1 is inserted from the light source lamp mounting cylinder 43. The shaft 1a is mounted so as to be parallel to the light source lamp mounting tube 43 and to be located substantially at the center of the light source lamp mounting tube 43. And the light source lamp mounting cylinder 4
A donut-shaped ventilation port (rear-side ventilation port) 44 is formed by the space between the inner periphery of the light source 3 and the shaft of the light source lamp 1. As shown by the dotted arrow in (b), it is discharged to the outside.

Further, a shutter mechanism 50 for closing the ventilation port 44 by the wind pressure of the blast when the light source lamp 1 explodes is provided on the outer peripheral portion of the light source lamp mounting cylinder 43, and the shutter mechanism 50 is connected to the reflector 2. It is provided integrally.

The shutter mechanism 50 has a frame 51,
The frame 51 has a vertical portion 52a for receiving wind pressure due to the blast of the light source lamp 1 when the light source lamp 1 explodes. And a sliding member 56 which is connected to the rotating member 52 by a pin 54 and slides forward in conjunction with the movement of the rotating member 52 by the guide of a guide rail 55 fixed to the frame 51, and the ventilation port 44. A shutter member 57 provided to be openable and closable is provided, and the shutter member 57 has, on its inner surface side, a locking portion 57a extending forward, and the locking portion 57a is configured as shown in FIG. When the light source lamp 1 shown in FIG.
Are biased toward the light source optical axis 10ax side by a spring 58 in a state of being locked at the rear end of the light source.

The shutter mechanism 50 thus configured
In the case where the light source lamp 1 explodes, the rotating member 5
The second vertical portion 52a receives the blast flowing in the direction indicated by the dotted arrow in the reflector 2 in FIG. 2B, and the rotating member 52 rotates in the direction of arrow B. Then, the slide member 56 connected to the rotating member 52 by the pin 54
Is guided by the guide rail 55 and slides forward. As a result, the rear end of the slide member 56 is unlocked from the locking portion 57a of the shutter member 57, and the spring 5
8 causes the shutter member 57 to move the light source optical axis 10a.
It moves to the x side and closes the ventilation port 44. Note that the shutter mechanism 50 is an example, and the mechanism is not limited to this, and another configuration may be used as long as the ventilation port 44 is closed by a blast.

In the light source device 60 configured as described above, when the power is turned on and the light source lamp 1 is turned on, the fans (not shown) provided above and below the reflector 2 also start to be driven, and cooling from the fan is started. Air is introduced into the inside from the upper and lower ventilation holes 31. Then, warm air existing in the internal space of the reflector 2 is discharged from the ventilation port 44 behind the reflector 2 by the introduced cooling air, whereby the internal space of the reflector 2 is cooled.

When the light source lamp 1 unexpectedly explodes, the shutter mechanism 40 and the shutter mechanism 50 are respectively ventilated by the blast flowing in the direction of the dotted arrow shown in the reflector 2 of FIG. And the vent 44 is closed. That is, in the shutter mechanism 40, the rotating member 42 rotates in the direction of arrow A about the pin 41 by the wind pressure of the
a locks the locking portion 3 a of the explosion-proof glass 3 and closes the vent 31. On the other hand, in the shutter mechanism 50, the rotating member 52 is rotated in the direction of arrow B with the pin 53 as a fulcrum by the wind pressure of the blast received by the vertical portion 52a, and is thereby connected to the rotating member 52 by the pin 54. The sliding member 56 slides forward. As a result, the rear end portion of the slide member 56 and the locking portion 5 of the shutter member 57
7a is released, and the shutter member 57 is moved toward the light source optical axis 10ax by the urging force of the spring 58, and
Close.

As described above, according to the first embodiment, while the light source lamp 1 does not explode, the cooling air can be reliably passed through the internal space of the reflector 2 for cooling.
Further, when the light source lamp 1 explodes, the blast blows the air vents 31 and 44, so that debris can be prevented from being scattered at the time of explosion.

When the light source device 60 is replaced, the ventilation holes 31 and 44 are closed, so that the fragments of the light source lamp 1 can be reliably prevented from falling from the ventilation holes 31 and 44. . Therefore, it is possible to prevent a decrease in workability at the time of replacement, and it is possible to perform the replacement work safely and efficiently.

The shutter mechanism 50 includes the reflector 2
The installation position is a space behind the curved portion of the reflector 2 (specifically, the outer peripheral portion of the light source lamp mounting tube portion 43), and the space is a conventional light source device. Since the space is wasted without being particularly used in the first embodiment, the shutter mechanism 50 of the first embodiment can be provided without increasing the size of the entire configuration.

This point will be specifically described with reference to the drawings. FIG. 3 is a schematic perspective view of the light source device 60 as viewed from the rear side. In FIG. 3, reference numeral 70 denotes a lamp housing used when the light source device 60 is mounted on the projector. The light source device 60 is housed inside the lamp housing 70 and mounted as a lamp unit 71 in a projector main body (not shown). It is supposed to be.

In the lamp unit 71, the space behind the reflector 2 is a space that was conventionally unused and wasted without any use. The shutter mechanism 50 according to the second embodiment is provided in the space. Therefore, the shutter mechanism 50 can be provided without increasing the overall configuration.

The shutter mechanism 50 is connected to the reflector 2
The structure on the projector main body side can be simplified as compared with the case where the lamp housing 70 is provided as a single unit. More specifically, in the case where the lamp housing 70 is provided, it is necessary to change the structure of the projector main body side in accordance with the structural change of the lamp housing 70, which may lead to a complicated main body structure. On the other hand, the structure on the main body side can be simplified by adopting the reflector integrated structure.

In the first embodiment, ventilation holes 31 and 44 are provided on the front side and the rear side of the reflector 2, respectively, and the cooling air introduced from the ventilation hole 31 provided on the front side is supplied to the rear side. Since the air is exhausted from the ventilation port 44 provided, the cooling air can be effectively passed through the entire internal space of the reflector 2, and the cooling efficiency can be increased.

As described above, according to the first embodiment, while improving the cooling performance, it is possible to reliably prevent the fragments from being scattered when the light source lamp explodes, and to excel in the workability at the time of replacement. Light source device 60 can be obtained.

In the first embodiment, the case where the shutter mechanism 40 of the ventilation port 31 is provided on the vertical portion 2a extending outward from the upper side and the lower side of the opening of the reflector 2 is illustrated. However, the present invention is not limited to this, and may be provided on the explosion-proof glass 3 side. In any case, when the light emitted from the light source lamp 1 is reflected forward, It suffices if the position is not in the way and is provided integrally with the reflector 2 or the explosion-proof glass 3.

Embodiment 2 FIG. 4 shows a light source device 80 according to Embodiment 2 of the present invention. The same parts as those in FIG. 1 are denoted by the same reference numerals, and description thereof will be omitted. Although the first embodiment has a structure in which the shutter is closed by the wind pressure of the blast, the second embodiment utilizes the fact that the power supply to the light source lamp 1 is cut off when the light source lamp 1 explodes. An explosion of the light source lamp 1 is detected by a change in voltage or current supplied to the lamp 1, and the shutter is closed at the same time as the detection.

In FIG. 4, reference numeral 81 denotes a reflector.
Vent 8 for introducing cooling air from a fan (not shown) provided below
2 are formed. Reference numeral 83 denotes a shutter that closes each of the vents 82, and reference numeral 84 denotes a shutter that closes the vent 44 provided at the rear of the reflector 81. These shutters 83 and 84 are not shown in detail, but are integrated with the reflector 2. It is provided in. Alternatively, it is provided adjacent to and separated from the reflector 81.

Reference numeral 85 denotes a lighting device for lighting the light source lamp 1, and reference numeral 86 denotes a shutter driving circuit to be described later when the light source lamp 1 detects an explosion due to a change in current or voltage to the lighting device 85. The detection circuit 87 outputs a signal to the shutter 87. The shutter driving circuit 87 drives the shutters 82 and 83 when receiving the detection signal from the detection circuit 86.

In the light source device 80 configured as described above, when the light source lamp 1 that has been turned on under the control of the lighting device 85 unexpectedly explodes, the detection circuit 86 changes the current or voltage at this time, and the detection circuit 86 causes the light source lamp 1 to change. Is detected, and a detection signal is output to the shutter drive circuit 87. Upon receiving the detection signal from the detection circuit 86, the shutter drive circuit 87 drives the shutters 81 and 83 to close the ventilation holes 81 and 44, respectively.

As described above, according to the second embodiment, when the light source lamp 1 explodes, the vents 82 and 44 are closed by the shutters 83 and 84, respectively. The same effect can be obtained. That is, it is possible to obtain the light source device 80 which can surely prevent the debris from being scattered when the light source lamp explodes while improving the cooling performance, and which is excellent in workability at the time of replacement.

Embodiment 3 FIG. 5 is a diagram showing a light source device 90 according to Embodiment 3 of the present invention. The same parts as those in FIG. 4 are denoted by the same reference numerals, and description thereof will be omitted. In the light source device 90 according to the fourth embodiment, a bimetal plate 91 that is deformed by temperature is attached to the upper and lower two surfaces of the outer periphery of the explosion-proof glass 3 so as to cover the respective vents 82. It opens and closes according to the temperature change of the internal space.

When the bimetal plate 91 is in a low temperature (normal temperature) state, it has a flat plate shape as shown by a broken line in FIG. 5, and the open end 91 a is located at the opening of the reflector 81 and is ventilated. The mouth 82 is closed. When the temperature rises to a high temperature state, as shown by the solid line in FIG.
The open end 91 a curves in a direction away from the opening of the reflector 81 to open the vent 82. Reflector 8
A fan (not shown) is provided in the vicinity of the lower ventilation port 82, and cooling air from the fan is
1 is introduced into the internal space from the lower ventilation port 82, and warm air in the internal space of the reflector 2 is discharged from the upper ventilation port 82, so that the rise in the temperature of the internal space of the reflector 81 is suppressed. ing.

FIG. 5 shows an example in which the open end 91a of the bimetal plate 91 is bent outward when the temperature rises. Is also good. In the deformation process, the bimetal plate 91 is mounted so as not to block light rays reflected by the reflector 81 and emitted forward. Specifically, for example, in FIG. 1, when the bimetal plate 91 is simply turned upside down and mounted so that the bimetal plate 91 curves inward when the temperature rises, the bimetal plate 91 Since the open end 91a is located inside the opening of the reflector 81 and blocks the light beam, in such a case, for example, the explosion-proof glass 3 extends outward and is attached to the tip thereof. In other words, such a configuration is adopted.

In the light source device 90 according to the third embodiment, when the light source lamp 1 explodes, the bimetal plate 91 is in a curved state and the vent 82 is opened, so that the light source device 90 is housed inside. In the lamp housing 70,
The scattering prevention means for preventing the fragments from being scattered from the ventilation port 82 (FIG.
(Illustrating the case where the side wall 92 is formed).

In the light source device 90 configured as described above, when the power is turned on and the light source lamp 1 is turned on, the bimetal plate 91 is in a flat plate state shortly after the lighting is started. After a while, the end 91 a on the open side gradually curves outward due to the heat of the light source lamp 1, and the vent 82 between the opening of the reflector 81 and the explosion-proof glass 3 is opened. On the other hand, a fan (not shown) is also driven at the same time when the power is turned on, and cooling air is introduced into the inside from the lower ventilation port 82 by the rotation of the fan, whereby the light source lamp 1 is cooled and
The air warmed by the heat of the air is discharged to the outside from the ventilation port 82 on the upper side.

When the light source lamp 1 explodes unexpectedly, the scattering of the debris at the time of the explosion is prevented by the side wall 92 of the lamp housing 70. Then, the temperature in the reflector 81 gradually decreases as time elapses after the explosion, and accordingly, the bimetal plate 91 gradually returns to a flat plate shape, and finally closes the vent 82. .

Therefore, the ventilation port 82 is closed when the light source device 60 is replaced. (Normally, the replacement of the light source device 60 is performed after the entire light source device 60 has cooled. ), It can be replaced without any trouble such as the fragments falling from the vent 82 at the time of replacement, and the replacement work can be performed safely and without any trouble.

As described above, according to the third embodiment, since the bimetal plate 91 which is deformed by temperature is used, the vent 82 is closed by the cooling air as in the case of the conventional valve mechanism. This eliminates the inconvenience and allows the cooling air to reliably flow into the interior space of the reflector 81 when the temperature of the light source lamp 1 rises, so that the cooling efficiency can be increased.

When the light source lamp 1 is replaced after the explosion, the bimetal plate 91 returns to the original flat plate shape and the vent 82 is closed, so that the fragments of the light source lamp 1 fall from the vent 82. Can be reliably prevented. Therefore, it is possible to prevent a decrease in workability at the time of replacement, and it is possible to perform the replacement work safely and efficiently.

As described above, according to the third embodiment, while improving the cooling performance, it is possible to reliably prevent the debris from being scattered when the light source lamp explodes, and to provide excellent workability during replacement. The light source device 90 can be obtained.

In the third embodiment, the case where the bimetal plate 91 is mounted on the explosion-proof glass 3 has been described as an example, but it may be mounted on the reflector 81.
In any case, when the light emitted from the light source lamp 1 is reflected forward, it is positioned so as not to interfere optically, and is provided integrally with the reflector 81 or the explosion-proof glass 3. good.

As the mounting method, various methods such as heat caulking and metallic pressing and fixing can be adopted. In any case, if the air vent 82 is opened and closed by deformation due to temperature. Often, there is no particular limitation on the mounting method.

As described above, the embodiment of the present invention has been described, but the present invention is not limited to this.
The following modifications are also included in the present invention. For example, in the third embodiment shown in FIG. 5, instead of the side wall 92 (see FIG. 5) provided in the lamp housing 70 to prevent scattering from the vent 82, the shutter 83 of the second embodiment, that is, A configuration as shown in FIG. 6 in which a shutter driven when an explosion of the light source lamp 1 is detected may be provided.

In each of the above embodiments, the light source devices 60, 80, and 90 have been described as being replaced together with the light source device when the light source lamp 1 is replaced after the explosion. Only the light source device may be replaced, and the technology of the present invention can be applied to this type of light source device.

Next, an optical system of a projector incorporating the light source device configured as described above will be described.

The projector 100 shown in FIG. 7 includes a light source device 60, and illumination optics for uniformizing the illuminance distribution of the light emitted from the light source device 60 to uniformly illuminate the image forming area of the liquid crystal panel. A system 130 and a color light that separates a light beam W emitted from the illumination optical system 130 into red, green, and blue light beams R, G, and B, and guides the red light beam R and the green light beam G to corresponding liquid crystal panels. A separation optical system 140, a relay optical system 150 that guides a blue light beam B having a long optical path among the color light beams separated by the color light separation optical system 140 to a corresponding liquid crystal panel, and modulates each color light beam according to given image information. Liquid crystal panels 160a, 160b, and 160c as light modulators (reference numeral 160 is used unless otherwise specified), and a cross-daemon for synthesizing modulated color light beams. A black dichroic prism 170, and a projection lens 190 for enlarging and projecting the synthesized light beam onto the projection plane 180.

The illumination optical system 130 includes a first lens array 131 and a second lens array 132 in addition to the light source device 60.
, A polarization conversion element 133, and a superimposing lens 134. The light emitted from the light source device 60 is divided into a plurality of partial light beams by the first lens array 131, and each of the partial light beams is converted into a second lens array. 132 and the polarization conversion element 133, the light is incident on the superimposing lens 134, and each of the plurality of incident partial light beams is
4 irradiates the liquid crystal panel 160 in a superimposed manner.
0 is uniformly illuminated.

The color light separating optical system 140 includes a blue-green reflecting dichroic mirror 141 and a green reflecting dichroic mirror 1.
42 and a reflecting mirror 143. The blue-green reflecting dichroic mirror 141 transmits the red light component of the illumination light from the illumination optical system 130 and reflects the blue light component and the green component. The transmitted red light beam R is reflected by the reflecting mirror 4
3 and reaches the liquid crystal panel 160a. on the other hand,
Of the blue light beam B and the green light beam G reflected by the blue-green reflecting dichroic mirror 141, the green light beam G is reflected by the green reflecting dichroic mirror 142, and the liquid crystal panel 1
Reaches 60b. On the other hand, the blue light flux B also passes through the green reflecting dichroic mirror 142 and enters the relay optical system 150.

The relay optical system 150 is provided in an optical path for guiding the blue light flux B to the corresponding liquid crystal panel 160c. The relay optical system 150 guides the blue light flux B to the liquid crystal panel 160c while maintaining its intensity. Relay lens 151 and second relay lens 152 condensing light to
, A condenser lens 153, and reflecting mirrors 154 and 15
5 is provided.

The three liquid crystal panels 160 function as light modulating means for modulating the incident light into respective color lights in accordance with given image information (image signals) and forming images of the respective color components. And corresponds to a so-called electro-optical device. Incidentally, polarizing plates (not shown) are provided on the incident side and the outgoing side of these three liquid crystal panels 160, and only predetermined polarized light is supplied to the liquid crystal panels 160.
Is transmitted through the polarizer on the incident side of the optical modulator and modulated.

The modulated three color lights enter the cross dichroic prism 170 and are combined, and the combined light is projected on the projection surface 180 by the projection lens 190.

The projector 100 configured as described above
In the above, since the light source device 60 according to the present invention is used, the inside of the light source device 60 is effectively cooled, and
It is possible to prevent the temperature inside the housing of the projector from rising due to heat generated by the light source lamp 1 of the light source device. As a result, it is possible to prevent performance degradation due to a rise in the temperature of the liquid crystal panel and deterioration in the image quality of the projected image. The same effect can be obtained when the light source devices 80 and 90 are used instead of the light source device 60.

Further, in the light source device according to the present invention, since the shutter mechanism 50 is provided in a space which was conventionally unused and wasted at all, the overall configuration of the projector to which the shutter mechanism 50 is applied is also large. Thus, it is possible to obtain the projector 100 exhibiting the above-described effects without being modified.

In addition, when the light source lamp explodes, the fragments are prevented from being scattered.
By adopting the light source device of the present invention in which the technique of preventing fragments from falling when replacing the light source device is employed, it is possible to obtain the projector 100 which is not affected by the explosion of the light source lamp 1.

In the above embodiment, the case where the light source device of the present invention is applied to the transmissive projector 100 is described as an example. However, the present invention can be applied to a reflective projector. is there. Here, “transmission type” means
An electro-optical device such as a liquid crystal panel means a type that transmits light, and a “reflection type” means that an electro-optical device such as a liquid crystal panel is a type that reflects light. In a projector employing a reflection-type electro-optical device, a dichroic prism converts light into red, green, and blue light.
In addition to being used as a color light separating unit that separates the three lights, it may also be used as a color light combining unit that combines three modulated lights and emits them in the same direction. Even when the present invention is applied to a reflection type projector, substantially the same effects as those of a transmission type projector can be obtained.

Further, in the above-described embodiment, a projector for displaying a color image has been described as an example. However, the light source device of the present invention can be applied to a projector for displaying a monochrome image. In this case, the same effects as those of the projector can be obtained.

Further, in the above embodiment, an example is shown in which a liquid crystal panel is used as the electro-optical device for light modulation. However, the present invention is not limited to this. For example, the device uses a micro mirror. Is also good. Further, in the above-described embodiment, a front-projection projector that performs projection from the direction in which a projected image is observed has been described as an example. It is also possible to apply the light source device of the invention.

Further, in the above embodiment, the case where the light source device of the present invention is applied to a so-called three-panel type projector using three liquid crystal panels has been described as an example. The present invention can be applied to a liquid crystal panel projector, a single-panel DMD type projector, and a two-panel or four-panel projector using two or four liquid crystal panels.

[Brief description of the drawings]

FIG. 1 is a diagram illustrating a light source device 60 according to a first embodiment of the present invention, particularly illustrating a state when a light source lamp is turned on.

FIG. 2 is a diagram showing a light source device 60 according to the first embodiment of the present invention, particularly showing a state after a light source lamp explodes.

FIG. 3 is a schematic perspective view of the light source device 60 of FIG. 1 as viewed from the rear side.

FIG. 4 is a diagram showing a light source device 80 according to Embodiment 2 of the present invention.

FIG. 5 is a diagram showing a light source device 90 according to a third embodiment of the present invention.

FIG. 6 is a diagram showing a modification of the present invention.

7 is a diagram showing a configuration of a projector 100 in which the light source device 60 of FIG. 1 is incorporated.

FIG. 8 is a view showing a conventional light source device.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Light source lamp 1a Shaft part of light source lamp 2, 81 Reflector 3 Explosion-proof glass 10ax Light source optical axis 31, 82 Vent (front side vent) 43 Light source lamp mounting cylinder part 44 Vent (rear side vent) 40, 50, 83 shutter mechanism 60, 80, 90 light source device 71 lamp unit 86 detection circuit (detection means) 91 bimetal plate 100 projector

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI Theme coat ゛ (Reference) G03B 21/14 F21Y 101: 00 F21M 1/00 R 21/16 7/00 L // F21W 131: 406 N F21Y 101: 00 (72) Inventor Tomiyoshi Ushiyama 3-5-5 Yamato, Suwa-shi, Nagano F-term in Seiko Epson Corporation (reference) 3K014 AA01 JA00 3K042 AA01 AC06 BA05 BA10 BB01 BC01 CC06

Claims (12)

[Claims] 1. A concave reflector having a plurality of vents formed therein and having a light source lamp mounted therein, an explosion-proof glass disposed in front of the reflector, and a wind pressure generated by a blast when the light source lamp explodes. A light source device comprising: a shutter mechanism for closing each of the ventilation holes. 2. A concave reflector having a plurality of vents formed therein and having a light source lamp mounted therein, an explosion-proof glass disposed in front of the reflector, and detection means for detecting an explosion of the light source lamp; A light source device comprising: a shutter mechanism for closing each of the vents when the detection means detects that the light source lamp has exploded. 3. The air vent according to claim 1, wherein the air vent comprises a rear air vent provided at a central portion of the reflector, and a front air vent provided near an opening of the reflector. The light source device according to claim 1 or 2. 4. A shutter mechanism for closing the front side ventilation port, wherein the shutter mechanism is provided so as not to block a light beam emitted from the light source lamp and reflected forward by the reflector. Item 3. The light source device according to item 3. 5. The light source device according to claim 3, wherein a shutter mechanism for opening and closing the rear side ventilation port is disposed on an outer peripheral portion of the light source lamp mounting cylinder portion of the reflector. 6. A fan is provided in the vicinity of the front air vent provided on a side surface of the reflector, and blows air from the front air vent to the rear air vent. The light source device according to claim 3. 7. A vehicle comprising: a concave reflector having a plurality of ventilation holes formed therein and having a light source lamp mounted therein; and an explosion-proof glass disposed in front of the reflector.
In a light source device mounted in a lamp housing provided with scattering prevention means for preventing scattering from each of the ventilation holes, a light source device is provided so as to cover each of the ventilation holes, and a temperature of an internal space of the reflector is provided. A light source device, comprising: a bimetal plate that is deformed by a change, wherein the bimetal plate opens the ventilation port when the temperature of the light source lamp is high due to heat and closes the ventilation hole when the temperature is low. 8. The scatter prevention means is a shutter which closes the vent when the light source lamp explosion is detected by the light source lamp explosion detection means. The light source device according to claim 1. 9. The light source lamp according to claim 2, wherein the detecting means detects a change in current or voltage supplied to the light source lamp to detect an explosion of the light source lamp. Light source device. 10. The light source device according to claim 7, wherein a fan is provided near the vent. 11. A lamp unit comprising: the light source device according to claim 1; and a lamp housing that houses the light source device. 12. A projector comprising the light source device according to claim 1. Description: