JP2005309121A - Light source apparatus, and projector equipped with the same - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To efficiently cool the inside of a reflector for a light source apparatus. <P>SOLUTION: The light source apparatus comprises a lamp bulb 1 and the reflector 2 for reflecting the light emitted from the lamp bulb 1. The reflector 2 is constituted of an inner reflector 2a and an outer reflector part 2b having reflection surfaces constituted of a plurality of geometric shapes, and slits 6a and 6b are formed in the joint parts of respective reflection surfaces. The slits 6a and 6b are separately positioned above and beneath the lamp bulb 1. Then, the air can pass from the inside to the outside of the reflector 2, then, the reflector can be efficiently cooled even when the reflector is cooled by natural convection, and also, forcibly cooled by a fan. Besides, a projector using the light source apparatus can be attained. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a light source device and a projector including the light source device, and more particularly, to a light source device including a cooling mechanism for heat generated by a light source lamp, and a projector that projects an image using light from the light source device. .

  There has been provided a projector that performs image projection on a screen or the like by light source light emitted from a light source device. In such a light source device that emits light source light, a discharge lamp such as a metal halide lamp or an ultrahigh pressure mercury lamp is used as a light source lamp. In most light source devices using such a light source lamp, a cooling device for cooling the heat generated by the light source lamp is required.

  For example, if the temperature of the lamp bulb (tube) of the light source is not uniform, the gas sealed inside the lamp bulb is deposited on the inner wall, and the cloudiness or blackening of the lamp bulb is induced. As a result, the brightness of the light emitted from the lamp bulb is reduced, flicker is caused, or the lamp bulb is ruptured. Further, molybdenum at the tip seal portion of the lamp bulb has a characteristic that it is easily oxidized at a high temperature. Therefore, in order to suppress these deteriorations in characteristics, it is necessary to cool the lamp bulb and maintain reliability.

  FIG. 7 is a schematic configuration diagram for explaining an example of a conventional light source device, and shows a light source device having an elliptical reflector. In FIG. 7, 1 is a lamp bulb (tube part), 2 is a reflector, 3 is a lamp base, 4 is explosion-proof glass, 5 is a net, 7 is a fan, 8 is a notch formed at the front edge of the reflector, 9 is An opening provided in the lamp base, A is an optical axis (Z axis), F is an air flow, and P1 and P2 are focal positions.

  In the lamp bulb 1, the first focal point P1 of the reflecting surface (consisting of an ellipsoid a having the focal points P1 and P2 as a focal point) provided on the reflector 2 and the light emitting portion of the lamp bulb 1 coincide with each other. It is arranged and fixed via the lamp base 3. Thereby, the light r emitted from the first focal point P1 is focused on the second focal point P2.

  The explosion-proof glass 4 is attached to prevent damage to the illumination optical system due to scattering of glass fragments when the lamp bulb 1 is ruptured. Here, paying attention to the internal temperature of the reflector 2 and the external temperature thereof, the inside of the reflector 2 covered with the explosion-proof glass 4 or the like becomes very hot. Or an opening 9 in the lamp base 3 in addition to the notch 8 and a fan 7 for cooling the reflector 2 is installed. The cooling air from the fan 7 is discharged to the outside while cooling the inside of the reflector 2 with the flow indicated by the air flow F. At this time, in preparation for when the lamp bulb 1 is ruptured, a net 5 for preventing glass scattering is installed at the notch 8. Conventionally, cooling by forced convection is performed with the above-described configuration. There is also a configuration in which cooling is performed by natural convection without using the cooling fan 7 with the same configuration.

As a system using forced convection as described above, for example, Patent Document 1 discloses that a light-emitting tube (lamp bulb) is cooled and glass and metal fragments generated when the light-emitting tube is ruptured can be prevented. A light source device is disclosed. Here, a net made of fine metal or the like is arranged in the ventilation outlet of the lamp or the cooling air exhaust hole to prevent scattering of fragments generated when the arc tube bursts.
JP 2001-125195 A

  As shown in FIG. 7, in the forced cooling system in which the fan 7 for cooling the inside of the reflector 2 is provided and the cooling air is discharged to the outside of the reflector 2, the cooling fan 7 There arises a problem that the set size of the light source device becomes large. The inflow air from the fan 7 is exhausted from the notch 8 of the reflector 2 and the opening 9 provided in the lamp base 3. At this time, it is difficult to provide a large opening in the lamp base 3. Further, since the through hole at the rear part of the reflector 2 cannot be increased in consideration of the loss of the light quantity, the exhaust from the lamp base 3 has a very large flow path resistance, and most of the inflow air from the cooling fan 7 is the network 5. Is exhausted from the notch 8 in which is installed. This means that the cooling air does not flow through the portion in the vicinity of the lamp bulb 1 that requires cooling.

  In order to solve the above problem, for example, air is not exhausted from the notch 8 in which the net 5 is installed, but is also blown by a cooling fan from this portion so that exhaust is performed only from the lamp base 3. A proposed system has been proposed. However, even in such a configuration, the ventilation resistance due to the rear through-hole of the reflector 2 and the opening 9 provided in the lamp base 3 remains high, and in order to realize a desired air flow rate, the rotation of the fan It was necessary to increase the number to increase the wind speed, and noise resulting from this was a problem.

  Further, when considering a system that performs cooling by natural convection without using a cooling fan, a portion that is effective for cooling the lamp bulb 1 that generates the largest amount of heat in the light source device, for example, directly above the lamp bulb 1 or Since an opening cannot be provided in the region of the reflector 2 immediately below, sufficient cooling cannot be performed. If the reflector 2 is provided with an opening in the conventional structure, the area of the reflecting surface is reduced. In particular, since the amount of emitted light is large immediately above and immediately below the lamp bulb 1, the amount of emitted light is reduced due to the influence of the opening and the projected image is reduced. There arises a problem that the brightness is lowered.

  Further, in the conventional cooling method by natural convection, since air is supplied and exhausted through an opening of about 8 notches provided at the front edge of the reflector 2, even if air flows, a lamp bulb located near the innermost part of the reflector 2 The air in the vicinity of 1 could not be exhausted. Further, even if the lamp base 3 has an opening 9, the opening 9 is disposed at substantially the same height as the lamp bulb 1 serving as a heat source, so that inflow and outflow of air for promoting natural convection hardly occur. The problem arises.

Under the circumstances as described above, in the current projector, (1) high output of the lamp bulb for improving the brightness, (2) miniaturization of each part and parts for realizing a small set size. There is a demand for lowering the score and (3) realizing a low noise set.
Considering all of these, it means that the increase in heat generation density will become remarkable in the future, and the conventional cooling method cannot be used.

  The present invention has been made to solve the above-described problems, and provides a light source device and a light source device capable of efficiently performing cooling inside the reflector that becomes a high temperature by the amount of heat generated from a lamp bulb. The object is to provide a projector used.

  The first technical means includes a lamp bulb and a reflector that reflects light emitted from the lamp bulb, and the reflector has a multiple reflection surface configuration in which a reflection surface that reflects light has a plurality of geometric shapes. In addition, an opening through which air can pass from the inside of the reflector to the outside is formed in a part of the connecting portion of each reflecting surface constituting the multiple reflecting surface.

  According to a second technical means, in the first technical means, the opening has a straight line that coincides with a vertical direction when the light source device is installed at a use position among straight lines orthogonal to the optical axis of the lamp bulb, a reflector, Is formed at a position where the crossing points.

  A third technical means is the same as the second technical means, characterized in that the straight line intersects the light emitting portion of the lamp bulb.

  The fourth technical means is characterized in that, in the second technical means, the straight line intersects with a point on the optical axis that is separated from the light emitting portion of the lamp bulb in the light emitting direction.

  The fifth technical means performs heat dissipation of the reflector in any one of the first to fourth technical means by generating exhaust and intake air from the opening by natural convection accompanying a temperature rise inside the reflector. It is characterized by.

  Sixth technical means includes any one of the first to fourth technical means, including air blowing means for forcibly sending air inside the reflector, and air sent to the inside of the reflector by the air blowing means. The heat dissipation of the reflector is performed by discharging to the outside from the opening.

  A seventh technical means is any one of the first to sixth technical means, wherein a light-transmitting front plate is provided on a light emission side opening surface of the reflector.

  The eighth technical means is characterized in that, in any one of the first to seventh technical means, the light emission side opening surface of the reflector is covered with a net.

  A ninth technical means is any one of the first to eighth technical means, wherein the geometric shape is a spheroid or a paraboloid.

  A tenth technical means is obtained by an illumination optical system including any one of the first to ninth light source devices, an electro-optical device that modulates light from the illumination optical system according to image information, and the electro-optical device. And a projection optical system that projects the modulated light beam.

  An eleventh technical means is the same as the tenth technical means, comprising a drive unit for supplying image information to the electro-optical device for driving.

ADVANTAGE OF THE INVENTION According to this invention, the light source device which can perform efficiently the cooling inside the reflector which becomes high temperature with the calorie | heat amount which generate | occur | produces from a lamp bulb, and a projector using the light source device can be provided.
In particular, the air supply / exhaust opening can be provided on the reflection surface of the multiple-structure lamp reflector without reducing the reflection area, so that fresh air can be efficiently introduced into a portion with a large amount of heat. . And since this opening is arrange | positioned in the vertical up-down direction of a lamp bulb, ventilation by a chimney effect can be accelerated | stimulated and the temperature inside a lamp bulb and a lamp reflector can be reduced efficiently.

  Further, the above opening is provided by shifting the position in the optical axis direction of the lamp bulb from the position corresponding to the position where the lamp bulb is arranged in the emission direction of the reflector, so that the amount of light on the reflecting surface does not decrease. A structure in which air in the vicinity of the valve can be discharged more easily can be obtained.

Further, the inside of the lamp bulb and the reflector can be efficiently cooled by natural convection, and the reliability as a light source is improved. When forced cooling is performed, a low noise system can be configured as compared with a conventional forced air cooling system.
Furthermore, by providing a translucent front plate or net on the opening surface of the front surface of the reflector, even if the lamp bulb is ruptured, glass fragments can be prevented from scattering to the outside.

  By mounting the light source device having the above-described high-efficiency cooling characteristics, a user-friendly projector with low noise and cost merit can be provided.

  In the light source device according to the present invention, by providing an opening in the lamp reflector, exhaust heat from the inside of the reflector can be efficiently executed. At this time, the opening is provided in the reflector region at the same Z coordinate position as that of the lamp bulb, or the Z coordinate position shifted to the emission side, which could not be conventionally installed (in the optical axis direction). Is the Z axis).

  Here, in the present invention, in order to prevent a reduction in the amount of reflected light due to the provision of the opening, the reflecting surface of the reflector has a multiple structure. The multiple reflection surface is configured by connecting a plurality of reflection surfaces having a plurality of geometric shapes. Then, by providing an opening at the connecting portion of each reflecting surface, it is possible to provide an opening at a critical part above and below the lamp bulb without losing the amount of light reflected on the reflecting surface.

  Then, by shifting the opening position of the reflector to the vicinity of the vertical top or bottom of the lamp bulb or from the vertical top and bottom position to the emission side, the air heated by the heat of the lamp bulb is discharged to the outside and the cold air flows from the outside to the bottom. The chimney effect can be realized efficiently. Thereby, a remarkable cooling effect can be realized in a high heat generating component such as a lamp bulb.

  Hereinafter, embodiments of the present invention will be described more specifically with reference to the accompanying drawings. Note that in all the drawings for describing the embodiments, the same reference numerals are given to portions having the same functions, and repeated description thereof is omitted.

(Embodiment 1)
FIG. 1 is a schematic configuration diagram for explaining a first embodiment of a light source device according to the present invention, and shows an embodiment in which a reflector reflecting surface has a double structure. In FIG. 1, 1 is a lamp bulb (tube part), 2 is a reflector, 2a is an inner reflector part, 2b is an outer reflector part, 3 is a lamp base, 4 is explosion-proof glass, 5 is a net, 6a is an upper slit, 6b Is the lower slit, A is the optical axis (Z axis), F is the air flow, r is the light emitted from the lamp bulb, and P1 and P2 are the focal positions.

  The reflector 2 constitutes a multiple reflection surface in which a reflection surface that reflects light has a plurality of geometric shapes. In this embodiment, the reflector 2 is comprised from the inner side reflector part 2a and the outer side reflector part 2b, and, thereby, the reflective surface of a double structure is formed. Here, the plurality of geometric shapes are spheroidal surfaces, and the reflecting surfaces of the inner reflector portion 2a and the outer reflector portion 2b are formed according to ellipsoid surfaces a and b of different sizes having the same focal position (P1, P2), respectively. Has been. Therefore, the reflection surfaces of these two reflector portions 2a and 2b have the same focal positions P1 and P2.

  At this time, the inner reflector part 2a is always present inside the outer reflector part 2b. The lamp bulb 1 is arranged inside the reflector 2 and fixed to the lamp base 3. At this time, the light emitting portion of the lamp bulb 1 is arranged so as to coincide with the first focal position P1. Here, in the present invention, since the exhaust from the lamp base 3 is unnecessary, the lamp bulb 3 may be directly fixed to the reflector 2.

  With the configuration as described above, the light r emitted from the position of the first focus P1 passes through the explosion-proof glass 4 regardless of whether the light r is reflected by either the inner reflector portion 2a or the outer reflector portion 2b, and the same second focus position P2. Condensed to By adopting such a configuration, it is possible to provide the reflector 2 with slits 6a and 6b that are openings for air supply / exhaust without suffering optical loss in the reflector 2.

The slits 6a and 6b are provided at a connection portion between the reflection surface of the outer reflector portion 2b and the reflection surface of the inner reflector portion 2a constituting the multiple reflection surface. The light emitted from the lamp bulb 1 onto the radiation is not incident on the connection portion, and the light incident on the vicinity of the connection portion is always reflected by the reflection surface of either the inner reflector portion 2a or the outer reflector portion 2b. The
In addition, although the said opening by this invention does not limit the shape, in order to comprise a multiple reflection surface, it is suitable to make it the slit shape in which the longitudinal direction corresponds with the circumferential direction of a reflective surface.

  These slits 6a and 6b are provided around the lamp bulb 1 that generates the largest amount of heat. In this embodiment, the slits 6a and 6b are vertically aligned with the coordinate position of the Z-axis of the light emitting portion of the lamp bulb 1. Arranged at the upper and lower positions. For efficient exhaust, only the upper slit 6 a above the lamp bulb 1 and the lower slit 6 b below the lamp bulb 1 are provided, and slits are provided at other positions in the circumferential direction of the reflector 2. Do not. In other words, in the slits 6a and 6b, of the straight lines orthogonal to the optical axis A of the lamp bulb, the straight line that coincides with the vertical direction when the reflector 2 is installed at the use position intersects the reflecting surface of the reflector 2. In this embodiment, the straight line coincides with the position where the light emitting portion of the lamp bulb 1 intersects.

  With the above-described configuration, high-temperature air heated by the lamp bulb 1 is exhausted from the upper slit 6a above, and normal temperature air is sucked from the lower slit 6b, so that a so-called chimney effect is exhibited. As a result, it is possible to form a thermal path in which fresh air is sent to the most effective part by natural convection and the heated air is discharged from the part.

  As described above, the configuration of the present embodiment makes it possible to efficiently ventilate the interior of the reflector 2 that could not be sufficiently realized by the conventional cooling method using natural convection. Further, if the mesh 5 is provided in the slits 6a and 6b, even if the lamp bulb 1 is ruptured, the fragments can be prevented from scattering.

  In the present embodiment, an explosion-proof glass 4 is provided as a translucent front plate on the opening surface on the output side of the reflector 2. Further, a net (not shown) that covers the opening surface may be provided. The explosion-proof glass 4 and the net may be used in combination, or only one of them may be provided. As a result, even if the lamp bulb 1 is ruptured, it is possible to prevent glass fragments from being scattered outside.

(Embodiment 2)
FIG. 2 is a schematic configuration diagram for explaining a second embodiment of the light source device according to the present invention. In the present embodiment, the installation positions of the slits 6a and 6b provided in the reflector 2 in the first embodiment are changed so as to shift in the optical axis direction.
Here, the cooling conditions inside the reflector 2 change by moving the positions of the slits 6a and 6b provided on the reflecting surface of the reflector 2 back and forth in the Z-axis direction. At this time, a position suitable for air cooling by natural convection is a position where the slits 6a and 6b are shifted slightly forward (outward direction) in the Z-axis direction from the position of the light emitting portion of the lamp bulb 1. In other words, the slits 6a and 6b in the present embodiment include the straight line that is perpendicular to the optical axis A of the lamp bulb and that matches the vertical direction when the reflector 2 is installed at the use position, and the reflective surface of the reflector 2. Are formed so that the straight line coincides with a position where the straight line intersects a point on the optical axis that is separated from the light emitting portion of the lamp bulb 1 in the light emitting direction.

  Similarly to the first embodiment, the light emitted from the lamp bulb 1 onto the radiation is incident on the connection portion between the reflection surface of the outer reflector portion 2b and the reflection surface of the inner reflector portion 2a constituting the multiple reflection surface. Rather, the light that enters the vicinity of the connecting portion is always reflected by the reflecting surface of either the inner reflector portion 2a or the outer reflector portion 2b.

Also in the present embodiment, as in the first embodiment, an explosion-proof glass 4 is provided as a translucent front plate on the opening surface of the front surface on the emission side of the reflector 2. Further, a net (not shown) that covers the opening surface may be provided. The explosion-proof glass 4 and the net may be used in combination, or only one of them may be provided. As a result, even if the lamp bulb is ruptured, it is possible to prevent glass fragments from scattering to the outside.
By configuring as described above, there is no loss of light amount, the resistance of the air flow path can be reduced, and highly effective exhaust heat can be performed even by cooling by natural convection.

(Embodiment 3)
FIG. 3 is a schematic configuration diagram for explaining a third embodiment of the light source device according to the present invention. In the present embodiment, in addition to the configuration of the first embodiment, a fan 7 which is a blowing unit for performing forced cooling is provided. Here, for example, as described in the conventional example, a notch 8 is provided at the front edge of the reflector 2, and cooling air from the fan 7 can be introduced into the reflector 2 through the notch 8. Needless to say, the present invention is not limited to the above-described notch 8, and any configuration can be used as long as an opening capable of introducing air is formed.
According to this configuration, since the flow resistance of the cooling air is small and fresh air can be flowed to a necessary part (high temperature part), noise generation by a conventional fan can be prevented.

(Embodiment 4)
FIG. 4 is a schematic configuration diagram for explaining a light source device according to a fourth embodiment of the present invention. In the present embodiment, in addition to the configuration of the first embodiment as in the third embodiment, a fan 7 that is a blowing unit for performing forced cooling is provided. In the present embodiment, notches 8 are provided at two locations above and below the front edge of the reflector 2, and cooling air from the fan 7 can be introduced into the reflector 2 through each of the notches 8. In this case as well, the present invention is not limited to the above-described notches, and any configuration can be used as long as an opening capable of introducing air is formed. Here, the cooling fan is installed on the rear rear side of the reflector 2 and fresh air is appropriately introduced into the two cutouts 8. However, the installation position is not limited and is sent from the fan 7. What is necessary is just to be able to take the structure which can introduce air into the inside of the reflector 2.
According to this configuration, since the flow resistance of the cooling air is small and fresh air can be flowed to a necessary part (high temperature part), noise generation by a conventional fan can be prevented.

(Embodiment 5)
FIG. 5 is a schematic configuration diagram for explaining a light source device according to a fifth embodiment of the present invention.
Although each said embodiment has shown the structural example by an elliptical reflector, this invention is applicable also in a parabolic reflector (parabolic reflector). That is, the present invention can also be applied to a reflector using a rotating paraboloid as a plurality of geometric shapes constituting the multiple reflection surface.
The configuration shown in FIG. 5 includes a reflector 2 having a double-structured object reflecting surface, and slits 6 a and 6 b are formed in the reflector 2. Although the present embodiment shows a configuration corresponding to the configuration of the second embodiment, it is obvious that the parabolic reflector can be applied to other embodiments.

(Embodiment 6)
By applying the light source device of each of the above embodiments to a projector, it is possible to provide a projector that can perform high-quality image projection with a long lamp life by performing efficient cooling.
FIG. 6 is a block diagram for explaining an embodiment of the projector of the present invention. The projector includes an illumination optical system 10 including the light source device 10a having the above-described high-efficiency cooling characteristics, an electro-optical device 11 that modulates light emitted from the illumination optical system 10 according to image information, and the electro-optical device 11 And a projection optical system 12 for projecting the modulated light flux obtained in (1). Further, in the above configuration, a drive unit 13 for supplying image information to the electro-optical device and driving it may be provided.

  In this projector, by using the light source device 10a that does not perform the above-described forced cooling, the lamp bulb 1 can be cooled without using a cooling fan that blows air into the reflector 2. Further, by using a light source device that performs forced cooling, a projector with high cooling efficiency and low noise can be provided.

It is a schematic block diagram for demonstrating 1st Embodiment of the light source device by this invention. It is a schematic block diagram for demonstrating 2nd Embodiment of the light source device by this invention. It is a schematic block diagram for demonstrating 3rd Embodiment of the light source device by this invention. It is a schematic block diagram for demonstrating 4th Embodiment of the light source device by this invention. It is a schematic block diagram for demonstrating 5th Embodiment of the light source device by this invention. It is a block diagram for explaining one embodiment of a projector of the present invention. It is a schematic block diagram for demonstrating an example of the conventional light source device.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Lamp bulb (tube part), 2 ... Reflector, 2a ... Inner reflector part, 2b ... Outer reflector part, 3 ... Lamp base, 4 ... Explosion-proof glass, 5 ... Net, 6a ... Upper slit, 6b ... Lower slit, DESCRIPTION OF SYMBOLS 7 ... Fan, 8 ... Notch, 9 ... Aperture, 10 ... Illumination optical system, 10a ... Light source device, 11 ... Electro-optical device, 12 ... Projection optical system, 13 ... Drive part, A ... Optical axis (Z axis), F: Air flow, P1, P2: Focus position.

Claims (11)

  And a reflector that reflects light emitted from the lamp bulb, the reflector having a multiple reflection surface configuration in which a reflection surface that reflects light has a plurality of geometric shapes, and the multiple reflection surface An opening through which air can pass from the inside of the reflector to the outside is formed in a part of the connecting portion of each reflecting surface constituting the light source device.   2. The light source device according to claim 1, wherein the reflector intersects a straight line that coincides with a vertical direction when the light source device is installed at a use position among straight lines orthogonal to an optical axis of the lamp bulb, and the reflector. A light source device characterized by being formed at a position where   The light source device according to claim 2, wherein the straight line intersects a light emitting portion of the lamp bulb.   3. The light source device according to claim 2, wherein the straight line intersects with a point on the optical axis that is separated from the light emitting portion of the lamp bulb in the light emitting direction.   5. The light source device according to claim 1, wherein the reflector radiates heat by generating exhaust and intake air from the opening by natural convection accompanying a temperature rise inside the reflector. 6. Light source device.   5. The light source device according to claim 1, further comprising: a blowing unit that forcibly sends air inside the reflector, wherein the air sent to the inside of the reflector by the blowing unit is the opening. A light source device, wherein the reflector radiates heat by being discharged to the outside.   The light source device according to claim 1, wherein a light-transmitting front plate is provided on a light emission side opening surface of the reflector.   8. The light source device according to claim 1, wherein a light emission side opening surface of the reflector is covered with a net.   9. The light source device according to claim 1, wherein the geometric shape is a spheroid or a paraboloid of revolution.   An illumination optical system including the light source device according to any one of claims 1 to 9, an electro-optical device that modulates light from the illumination optical system according to image information, and a modulated light beam obtained by the electro-optical device A projector comprising: a projection optical system that projects a bundle.   11. The projector according to claim 10, further comprising a drive unit for supplying the image information to the electro-optical device and driving it.

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