JP2007335196A - Light source device and projector - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a light source device in which by positioning the both end part sides of a discharge tube on the outer peripheral side of a second reflecting face, heating of both end part sides by light reflected on the second reflecting face is suppressed, and in which by covering the light emitting side of the discharge tube with a heat-radiating part, heating of the discharge tube, deterioration of illumination intensity, and shortening of life of the discharge tube are suppressed, and provide a projector provided with the light source device. <P>SOLUTION: The light source device 10 is provided with the discharge tube 1, a first reflecting mirror 2, and a second reflecting mirror 5. A second reflecting face 5c of the second reflecting mirror 5 covers a light emitting part 13 of the discharge tube 1, while sealing parts 14, 14 of the discharge tube 1 is positioned on the outer periphery side of the second reflecting face 5c. The sealing part 14 of the light emitting side of the discharge tube 1 is covered by the heat-radiating part 6. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a light source device that condenses light emitted from a discharge tube by a reflecting mirror having a partially elliptic spherical shell-like reflecting surface, and a projector including the light source device.

  There is a projector (projection type image display device) that displays an image by irradiating light from a light source device onto a spatial light modulation element such as a liquid crystal panel and projecting the light onto a screen. Projection-type image display devices are required to have high-luminance light source devices, and discharge tubes such as metal halide lamps and high-pressure mercury lamps are used.

FIG. 12 is a side sectional view showing a conventional light source device (see, for example, Patent Document 3). The light source device includes a discharge tube 80 that emits light.
The light emitted from the discharge tube 80 is collected by the first reflecting mirror 81. The first reflecting mirror 81 has a partially elliptical reflecting surface. The first reflecting mirror 81 is an electrode above the discharge tube 80 where one focal point F1 of the first reflecting mirror 81 coincides with the bright spot of the discharge tube 80, and passes through the opposite end portions of the rod-shaped anode 85 and cathode 86. With respect to the axis L, the elliptical axis E of the first reflecting mirror 81 is disposed so as to be inclined upward. The first reflecting mirror 81 reflects the light emitted upward from the bright spot and collects it at another focal point F2.

  The second reflecting mirror 84 includes a reflecting portion 84b having a substantially hemispherical shell inner surface as a reflecting surface, and flat mirror portions 84a and 84a that are integrally formed with the reflecting portion 84b and are provided on the outer periphery of the opening of the reflecting portion 84b. The reflecting portion 84 b is large enough to surround the lower side of the barrel-shaped light emitting portion 87 of the discharge tube 80. The first reflecting mirror 81 and the second reflecting mirror 84 surround the discharge tube 80, and an opening is provided in the light emission path.

The reflector 84 b reflects the light emitted from the bright spot toward the bright spot again, and the light that has passed through the bright spot is reflected by the first reflecting mirror 81. The aperture is between the focal points F1 and F2, and most of the light emitted from the aperture is collected at the focal point F2.
In the projector, the light condensed at the focal point F2 is projected onto a screen by irradiating a spatial light modulation element such as a liquid crystal panel or DMD (Digital Micromirror Device: registered trademark; hereinafter the same) with a condenser lens.

  During the lighting of the discharge tube 80, the anode 85 and the cathode 86 are at a high temperature of 2000 ° C. or higher, and the inside of the light emitting unit 87 is at a high pressure of 100 atm or more in the case of a high pressure mercury lamp, for example. There is a possibility that the substantially cylindrical sealing portions 88a and 88b sealing both ends of the 87 may be crushed. The sealing portion 88b is provided on the electrode axis L, and the sealing portion 88a passes through the first reflecting mirror 81 on the electrode axis L and is partially exposed.

  In this light source device, when any of the sealing portions 88a, 88b or the light emitting portion 87 is crushed, the transparent explosion-proof glass 83 that blocks the fragments and the harmful substances contained inside is scattered is provided on the light emitting side. It has an explosion-proof structure.

  In the conventional light source device, the electrode axis L coincides with the elliptic axis E passing through the focal points F1 and F2. In this case, the 1st reflective mirror 81 of the magnitude | size which the light which goes to the focus F2 does not irradiate the sealing part 88b was used. As the distance between the focal points F1 and F2 of the first reflecting mirror 81 becomes shorter, the amount of light that irradiates the sealing portion 88b increases. As the amount of light that irradiates the sealing portion 88b increases, the discharge tube 80 is heated strongly.

  Since excessive heating of the discharge tube 80 causes crushing, the first reflecting mirror 81 having a long distance between the focal points F1 and F2 is conventionally used. On the other hand, when the first reflecting mirror 81 having a short distance between the focal points F1 and F2 is used, the discharge tube 80 with low power consumption is used.

When the first reflecting mirror 81 having a long distance between the focal points F1 and F2 is used, there is a problem that the projector becomes large. On the other hand, when the discharge tube 80 with low power consumption is used and the distance between the focal points F1 and F2 is short, the projector becomes small, but there is a problem that the illuminance is low.
The explosion-proof glass 83 allows most of the light to pass therethrough, but part of the light is reflected and heats the light emitting unit 87. Therefore, the explosion-proof glass 83 may not be provided in the light source device, but it is not desirable because the explosion-proof glass is not provided.

Therefore, in the invention according to Patent Document 3, as described above, the ellipse axis E passing through the focal points F1 and F2 is inclined with respect to the electrode axis L passing through the tip ends of the anode 85 and the cathode 86. As a result, even if the first reflecting mirror 81 having a short focal length is used in order to reduce the size of the projector, the luminous flux extends to the sealing portion 88b and the feeder line extending outward from the sealing portion 88b and connected to the external lead. Since it does not collide, the metal foil embedded in the sealing portion 88b and the external lead are not oxidized, and the illuminance reduction is avoided.
JP 2003-187604 A JP 2003-241309 A JP 2005-228711 A

  In the light source device of FIG. 12, the incidence of light on the sealing portion 88 b is suppressed, but the internal space of the light source device sealed with the explosion-proof glass 83 is very high temperature, and the sealing portion 88 b is sufficiently cooled. There was a problem that it could not be done. Further, there is a problem that the sealing portion 88b is heated because light passes through the vicinity of the sealing portion 88b as the apparatus is miniaturized. And the light reflected by the explosion-proof glass 83 entered the sealing part 88b, and the sealing part 88b was heated. Accordingly, there has been a problem that the metal foil such as molybdenum foil and the external lead embedded in the sealing portion 88b are oxidized, the illuminance is lowered, and the life of the discharge tube 80 is shortened.

  The present invention has been made in view of such circumstances, and is configured so that both end portions of the discharge tube are positioned on the outer peripheral side of the second reflecting surface covering the light emitting portion, thereby reflecting on the second reflecting surface. The both ends are suppressed from being heated by the emitted light, and the discharge tube is heated by the light reflected by the first reflecting surface or the explosion-proof glass by covering the sealing portion on the light emitting side of the discharge tube with the heat radiating portion. It is an object of the present invention to provide a light source device that suppresses the decrease in illuminance and shortens the life of the discharge tube.

  In addition, the present invention sets the positional relationship so that the light reflected from the second reflecting surface passes through the luminescent spot in consideration of the refraction of light by taking the luminescent spot out of the focus of the second reflecting surface. An object of the present invention is to provide a light source device that can collect light at a point and maximize the amount of light that irradiates the first reflecting surface.

  And this invention aims at providing the light source device which can be reduced in size by forming a 2nd reflective surface in the surface of a light emission part.

  A further object of the present invention is to provide a light source device capable of reducing the size of the first reflecting mirror by fixing the sealing portion on the side where the anode of the discharge tube is disposed to the light emitting side. To do.

  In addition, the present invention reduces the amount of reflected light that irradiates the light emitting part of the discharge tube by making the elliptical axes that pass through the two focal points of the first reflecting mirror non-parallel to the electrode axis that passes through each tip of the electrode. An object of the present invention is to provide a light source device that suppresses heating of a discharge tube during lighting even when a first reflecting mirror having a short distance between focal points is used.

  And this invention can suppress deterioration by the heat | fever of a discharge tube by being provided with the above-mentioned light source device, can suppress the life shortening of a discharge tube, can suppress a fall in illumination intensity, and can shorten a focal distance. Therefore, an object is to provide a projector that can be miniaturized.

  A light source device according to the present invention has a spherical light emitting portion and a sealing portion continuously provided on both sides of the light emitting portion, and a pair of electrodes are provided in a state where each tip portion faces in the light emitting portion. A discharge tube that emits light by discharge between the tip portions, a first ellipsoid that is partially elliptical and has a first reflecting surface that collects light emitted by the discharge tube, and the discharge tube includes the first A second reflecting mirror having a second reflecting surface for re-entering the discharge tube with light radiated to the side opposite to the reflecting mirror side, and the elliptic axis passing through the two focal points of the first reflecting mirror. In the light source device in which the electrode axis passing through each tip portion is non-vertical, and the end portion of the discharge tube protrudes from the back portion, the light emitting portion is covered by the second reflecting surface, and both end portions of the discharge tube are Light that is located on the outer peripheral side of the second reflecting surface and that is emitted from the light reflected by the first reflecting surface or the second reflecting surface Comprising a heat radiating portion for covering the sealing portion of the elevation side, the sealing unit is characterized in that it is fixed the heat radiating portion, or the back end of the first reflector.

In the present invention, since both end portions of the discharge tube are positioned on the outer peripheral side of the second reflecting surface, it is suppressed that both end portions are heated by the light reflected by the second reflecting surface. 2. Description of the Related Art Conventionally, a light source device in which an electrode axis passing through each tip of an electrode is perpendicular to an elliptical axis passing through two focal points of a first reflecting mirror, and both ends of a discharge tube protrude outward from the first reflecting mirror However, the light source device with this configuration has a problem that it cannot use the light emitted forward from the light emitting unit, is inefficient, and has low illuminance. The light source device of the present invention has good light use efficiency.
And since the sealing part by the side of the light emission of a discharge tube is covered with the thermal radiation part, it is suppressed that it is heated with the light reflected by the 1st reflective surface or the explosion-proof glass. Heat generated inside the first reflecting surface is also radiated by the heat radiating portion, and deterioration of the discharge tube due to heat is suppressed.
Therefore, in this invention, it is suppressed that the metal foil and external lead which were embed | buried under the sealing part oxidize, illumination intensity falls, and the lifetime of a discharge tube becomes short.

  The light source device according to the present invention is characterized in that a focal point of the second reflecting surface is located closer to the first reflecting mirror than a bright spot of light emitted from the light emitting unit.

  In the present invention, the bright spot of the light emitted from the discharge tube is outside the focal point of the second reflecting mirror. When the bright spot of light is at the focal point of the second reflecting surface, the light radiated from the bright spot and reflected by the second reflecting surface is refracted by the discharge glass wall of the discharge tube and therefore does not pass through the bright spot. Therefore, as in the present invention, by setting the positional relationship so that the light reflected from the second reflecting surface passes through the luminescent spot in consideration of the refraction of light by taking the luminescent spot out of the focus of the second reflecting surface. , The light can be condensed on the bright spot, and the amount of light irradiating the first reflecting surface is maximized.

  A light source device according to the present invention has a spherical light emitting portion and a sealing portion continuously provided on both sides of the light emitting portion, and a pair of electrodes are provided in a state where each tip portion faces in the light emitting portion. A discharge tube that emits light by discharge between the tips, and a first reflection mirror that is partially elliptical and has a first reflection surface that collects light emitted from the discharge tube, the first reflection mirror In the light source device in which the electrode axis passing through each tip is non-perpendicular to the elliptical axis passing through the two focal points, and the end of the discharge tube protrudes from the back, the first reflecting mirror of the light emitting part A second reflection surface is formed on the surface opposite to the side to re-enter the light emitted from the bright spot of the light emitted from the light emitting portion to the bright spot side, and is reflected by the first reflective surface or the second reflective surface A heat radiating portion that covers the light emitting side sealing portion from which light is emitted is provided, and the sealing portion is the heat radiating portion or the first reflecting mirror. Characterized in that it is fixed to the back end.

In the present invention, since both end portions of the discharge tube are located on the outer peripheral side of the second reflecting surface, the both end portions are suppressed from being heated by the light reflected by the second reflecting surface. And since the sealing part of the light emission side of a discharge tube is covered with the thermal radiation part, it is suppressed that it is heated with the light reflected by the said 1st reflective surface or explosion-proof glass. Heat generated inside the first reflecting surface is also radiated by the heat radiating portion, and deterioration of the discharge tube due to heat is suppressed.
And in this invention, since the 2nd reflective surface is formed in the surface of a light emission part, the whole apparatus becomes compact.

  In the light source device according to the present invention, the discharge tube is a discharge tube by direct current lighting in which the pair of electrodes includes an anode and a cathode, and the sealing portion on the side where the anode is disposed is the sealing portion on the light emitting side And is fixed to the heat dissipating part.

  When the discharge tube is DC driven, the light distribution is narrower on the anode side due to the difference in the size of the electrodes. In the present invention, since the heat radiating part is provided on the light emitting side, the sealing part of the discharge tube on the side where the anode having a high heat quantity is arranged can be arranged on the light emitting side. Therefore, the first reflecting mirror can be made smaller than when the sealing portion on the side where the cathode is disposed is disposed on the light emitting side.

  The light source device according to the present invention includes a heat radiating portion that covers a sealing portion opposite to the sealing portion on the light emitting side.

  In this invention, since the sealing part on the opposite side to the sealing part by the side of the light emission of a discharge tube is also covered by a thermal radiation part, the thermal radiation effect improves further.

  The light source device according to the present invention is characterized in that the other sealing portion of the discharge tube is fixed to the side opposite to the side to which the sealing portion is fixed.

  In the present invention, it is possible to dissipate heat from both sides of the discharge tube.

  The light source device according to the present invention is characterized in that an ellipse axis passing through two focal points of the first reflecting mirror is not parallel to an electrode axis passing through each of the tip portions.

  In the present invention, since the ellipse axis of the reflecting mirror is not parallel to the electrode axis passing through the tips of the two electrodes of the discharge tube, compared to a light source device in which the electrode axis coincides with the ellipse axis. The amount of reflected light that irradiates the light emitting part of the tube is reduced. Therefore, even when the first reflecting mirror having a short distance between the focal points is used, the discharge tube is prevented from being heated during lighting.

  The light source device according to the present invention is characterized in that an explosion-proof glass is provided non-perpendicular to the electrode axis on the light emitting side.

  In the present invention, since the explosion-proof glass is provided in the light emission path reflected by the first reflecting mirror and the second reflecting mirror, it prevents the debris and harmful substances from scattering when the discharge tube is crushed. Is done. Since the glass is disposed so as to be non-perpendicular to the electrode axis, it is possible to suppress the radiated light from the discharge tube from being reflected by the glass and irradiating the discharge tube.

  The light source device according to the present invention is characterized in that the glass is coated with an ultraviolet reflecting film.

  In the present invention, since the glass is coated with an ultraviolet reflecting film, the light source device irradiates light from which ultraviolet rays have been removed. Therefore, for example, when the light source device is used in a projector using a liquid crystal panel, the liquid crystal is prevented from being deteriorated by the influence of ultraviolet rays.

  The light source device according to the present invention is characterized in that the glass is coated with an infrared reflecting film.

  In the present invention, since the infrared reflection film is coated on the glass, the light source device irradiates light from which infrared rays have been removed. For example, when the light source device is used in a projector, the temperature of each part of the optical system that receives light emitted from the light source device and generates an image is suppressed.

  A projector according to the present invention includes a light source device according to the present invention, a spatial light modulation element that generates modulated light according to an image using light emitted from the light source device, and a modulated light generated by the spatial light modulation element. And a projection lens that projects onto the screen.

  In the present invention, the light emitted from the light source device in which the deterioration of the discharge tube due to heat is suppressed is converted into the modulated light according to the image by the spatial light modulation element, and projected onto the projection object through the projection lens.

According to the present invention, since both end portions of the discharge tube are located on the outer peripheral side of the second reflecting surface, it is suppressed that the both end portions are heated by the light reflected by the second reflecting surface. And since the light emission side of a discharge tube is covered with the thermal radiation part, it is suppressed that it is heated with the light reflected by the 1st reflective surface or the explosion-proof glass. Heat generated inside the first reflecting surface is also radiated by the heat radiating portion, and deterioration of the discharge tube due to heat is suppressed.
Therefore, in this invention, it is suppressed that the metal foil and external lead embed | buried in the sealing part oxidize, illumination intensity falls, and the lifetime of a discharge tube becomes short.

  According to the present invention, since the bright point is out of the focus of the second reflecting surface and the light reflected from the second reflecting surface passes through the bright point in consideration of light refraction, the bright point is set. The amount of light that irradiates the first reflecting surface from here can be maximized.

  According to the present invention, since the second reflecting surface is formed on the surface of the light emitting unit, the entire apparatus becomes compact.

  According to the present invention, in the discharge tube, the sealing portion on the side where the anode is arranged is fixed to the light emitting side, and the light distribution on the anode side is narrower, so the cathode is arranged on the light emitting side. As a result, the first reflecting mirror can be made smaller.

  According to the present invention, since the other sealing portion of the discharge tube is fixed on the side opposite to the side where the sealing portion is fixed, heat can be radiated from both sides of the discharge tube.

  According to the present invention, since the ellipse axis passing through the two focal points of the first reflecting mirror is not parallel to the electrode axis passing through each tip, the amount of reflected light that irradiates the discharge tube is different from the electrode axis and the ellipse axis. Less than the matching light source device. Therefore, even when a reflecting mirror having a short distance between the focal points is used, the discharge tube is prevented from being heated during lighting.

  According to the present invention, the explosion-proof glass is provided non-perpendicular to the electrode axis on the light emitting side, so that fragments and harmful substances are prevented from scattering when the discharge tube is crushed. Since the glass is disposed so as to be non-perpendicular to the electrode axis, it is possible to prevent the light emitted from the discharge tube from being reflected by the glass and irradiating the discharge tube.

According to the present invention, since the above-described light source device is provided, deterioration of the discharge tube due to heat is suppressed.
The projector can be downsized by shortening the focal length.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

Embodiment 1 FIG.
FIG. 1 is a perspective view showing a light source device 10 according to the first embodiment of the present invention, FIG. 2 is a side sectional view of the light source device 10, and FIG. 3 is an enlarged sectional view taken along line III-III in FIG. In the figure, reference numeral 10 denotes a light source device.
The discharge tube 1 of the light source device 10 is of a short arc type using a high-pressure mercury lamp. The discharge tube 1 is a sealing tube made of quartz glass, and accommodates an anode 11 and a cathode 12. The discharge tube 1 includes a spherical light emitting portion 13 and sealing portions 14 and 14 provided continuously on both sides of the light emitting portion 13. Molybdenum foils 15 and 15 are respectively embedded in the sealing portions 14 and 14 so as to be hermetically sealed. The anode 11 and the cathode 12 are connected to the inner ends of the molybdenum foils 15 and 15, and the leads 16 and 16 are connected to the outer ends. The leads 16 and 16 are connected to a lighting circuit.

  The anode 11 and the cathode 12 are horizontally disposed in a state where the tip portions are opposed to each other in the light emitting unit 13. By the lighting circuit, a discharge is generated between the tip portions of the anode 11 and the cathode 12, and light is emitted. The electrode axis (center axis) of the anode 11 and the cathode 12 is L.

The first reflecting mirror 2 made of aluminum collects light emitted from the discharge tube 1. The 1st reflective mirror 2 has a substantially 1/4 partial ellipsoid spherical shell inner surface as the 1st reflective surface 2a.
The first reflecting mirror 2 is disposed above the discharge tube 1, and the focal point F <b> 1 of the first reflecting mirror 2 coincides with the bright spot of the discharge tube 1. The first reflecting mirror 2 reflects light traveling upward from the bright spot and collects it at the focal point F2. Let the ellipse axis be E. The ellipse axis E and the electrode axis L coincide with each other.
The first reflecting mirror 2 may be made of glass, and if it is made of metal, a radiation fin may be provided.

The second reflecting mirror 5 is formed integrally with the second reflecting portion 5a made of aluminum with the inner surface of the substantially hemispherical shell as the second reflecting surface 5c, and on the outer peripheral side of the opening of the second reflecting portion 5a. And a flat mirror portion 5b made of aluminum. The 2nd reflection part 5a covers the lower side of the light emission part 13, and the sealing parts 14 and 14 are comprised so that it may be located in the outer peripheral side of the 2nd reflection part 5a. The second reflecting mirror 5 is arranged on the lower side of the discharge tube 1 with the flat mirror portion 5b being horizontal. The first reflecting mirror 2 and the second reflecting mirror 5 surround the discharge tube 1, and an opening is provided in the light emission path.
The second reflecting mirror 5 may be made of glass, and if it is made of metal, a radiation fin may be provided.

The focal point of the second reflecting surface 5 c coincides with the focal point F <b> 1 on the base end side of the first reflecting mirror 2 and the bright spot of the discharge tube 1. That is, the second reflecting surface 5c has a curved surface shape centered on the focal point. The light emitted downward from the bright spot is reflected by the second reflecting surface 5 c, further reflected by the first reflecting surface 2 a, and emitted from the explosion-proof glass 4. When the luminescent spot of the discharge tube 1 and the focal point of the second reflecting portion 5a coincide, the light from the luminescent spot is reflected by the second reflecting surface 5c and refracted by the glass wall of the light emitting portion 13 when traveling toward the luminescent spot. Thus, it does not completely return to the bright spot S.
In the present embodiment, since the sealing portions 14 and 14 are located on the outer peripheral side of the second reflecting portion 5a, the light reflected by the second reflecting surface 5c is incident on the sealing portions 14 and 14 and sealed. Heating of the stop portions 14 and 14 is suppressed.

Most of the light emitted from the opening of the light source device 10 is collected at the focal point F2. In the projector, the light condensed at the focal point F2 is applied to the spatial light modulation element by the condenser lens.
A transparent explosion-proof glass 4 is provided in the opening, and the explosion-proof glass 4 forms an acute angle with respect to the electrode axis L (elliptical axis E). Below the explosion-proof glass 4, a shield 7 that shields light leaked from the sealing portion 14 is provided.

  The explosion-proof glass 4 may be coated with an ultraviolet reflecting film. In this case, since light from which the ultraviolet rays have been removed is emitted from the light source device 10, deterioration of the member that receives the irradiation light from the light source device 10 is prevented. In particular, since the liquid crystal easily deteriorates due to ultraviolet irradiation, it is effective to cover the explosion-proof glass 4 with an ultraviolet reflecting film when light from the light source device 10 irradiates the liquid crystal panel.

  The explosion-proof glass 4 may be covered with an infrared reflecting film. In this case, since the light from which the infrared rays are removed is emitted from the light source device 10, heating of the member that receives the irradiation light from the light source device 10 is prevented.

  The heat dissipating part 6 is made of aluminum, and covers the sealing part 14 on the light emitting side of the discharge tube 1 in a state where light emitted from the discharge tube 1 is not blocked. The heat radiation part 6 may be formed integrally with the plane mirror part 5b on the light emission side. Moreover, you may decide to provide a radiation fin.

  The explosion-proof glass 4 allows most of the light emitted from the discharge tube 1 to pass and reflects a part thereof. Since the angle formed by the explosion-proof glass 4 and the electrode axis L is an acute angle, the light reflected by the explosion-proof glass 4 irradiates the heat radiating part 6 or the plane mirror part 5b and is difficult to re-enter the light emitting part 13. Thereby, although the thermal radiation part 6 or the reflective mirror part 5b is heated, heat | fever conducts to the plane mirror part 5b which is contacting the thermal radiation part 6, and is thermally radiated from the planar mirror part 5b. Heat generated inside the first reflecting surface 2 is also radiated by the reflecting mirror part 5b or the heat radiating part 6. Therefore, the discharge tube 1 is prevented from being heated excessively, and deterioration of the discharge tube 1 due to heat is suppressed.

  The distal end portion of the other sealing portion 14 of the discharge tube 1 protrudes from the back portion of the light source device 10. The base end side of the first reflecting mirror 2 protrudes so as to cover the upper part of the sealing part 14, and the base end part side of the flat mirror part 5 b also protrudes so as to cover the lower part of the sealing part 14, It is composed. The sealing portion 14 is fixed to the base end portions of the first reflecting mirror 2 and the plane mirror portion 5 b with an adhesive 8.

The light source device 10 may have a configuration in which the explosion-proof glass 4 is not provided. In this case, since the heat dissipation is good, the discharge tube 1 having a higher output can be used.
In the present embodiment, a high-pressure mercury lamp is used for the discharge tube 1, but a metal halide lamp may be used.
In the present embodiment, a direct-current lamp is used for the discharge tube 1, but an alternating-current lamp may be used.
Further, the second reflecting portion 5a and the plane mirror portion 5b may be separate members, and a heat radiating portion in which the end portion on the back portion side of the first reflecting mirror 2 and the end portion on the back portion side of the plane mirror portion 5b are integrally formed. Also good.
Moreover, you may decide to provide the explosion-proof glass 4 extended to the part of the plane mirror part 5b, without providing the shielding body 7. FIG.

  The light source device 10 of this embodiment is used for a projector using a liquid crystal panel, for example. In this case, the light condensed at the focal point F2 is made uniform by the integrator lens, and then irradiated to the liquid crystal panel by the condenser lens. The light that irradiates the liquid crystal panel is projected onto the screen to display an image. In addition, the light source device 10 of the present embodiment can be used as an illumination light source for photography.

Embodiment 2. FIG.
FIG. 4 is a side sectional view showing the discharge tube 1 and the second reflecting mirror 25 of the light source device 20 according to Embodiment 2 of the present invention. In FIG. 4, the same parts as those of the light source device 10 of the first embodiment are denoted by the same reference numerals, and the description thereof is omitted.

  As in the first embodiment, when the bright spot S of light coincides with the focal point of the second reflective surface 5c, the light emitted from the bright spot S and reflected by the second reflective surface 5c is the glass of the light emitting unit 13. Since it refracts on the wall, it does not pass through the bright spot S. In the present embodiment, the focus F of the second reflecting surface 25c is positioned above the bright spot S, and the second reflecting surface 25c is centered on the focus F in consideration of light refraction. The curved surface is such that the light reflected by the two reflecting surfaces 25c passes through the bright spot S. Thereby, it can condense on the bright spot S, and the light quantity which irradiates the 1st reflective surface 2a from here becomes the maximum.

FIG. 5 is a longitudinal sectional view showing the light source device 20.
In the light source device 20, the arc in the section of the first reflecting surface of the first reflecting mirror 2 of the discharge tube 1 is larger than 180 degrees, and the arc by the section of the second reflecting surface 25c of the second reflecting mirror 25 is as described above. The angle is smaller than 180 degrees. A flat mirror portion 25b of the second reflecting mirror 25 is provided on the outer extension surface of the opening of the second reflecting surface 25c from the focal point F1. The first reflecting mirror 2 and the second reflecting mirror 25 surround the discharge tube 1, and an opening is provided in the light emission path.

Embodiment 3 FIG.
FIG. 6 is a side sectional view showing the discharge tube 31 of the light source device 30 according to Embodiment 3 of the present invention.
The discharge tube 31 is a sealing tube made of quartz glass, and accommodates an anode 31a and a cathode 31b. The discharge tube 31 includes a spherical light emitting portion 31c and sealing portions 31d and 31d provided on both sides of the light emitting portion 31c. A second reflective surface 31e is formed on the surface of the light emitting unit 31c by heat-resistant aluminum vapor deposition.

  Since the 2nd reflective surface 31e is formed only in the surface of the light emission part 31c, the light reflected by the 2nd reflective surface 31e injects into the sealing parts 31d and 31d, and heats the sealing parts 31d and 31d There is no. And compared with the case where the 2nd reflective mirror 5 is provided, an apparatus becomes compact.

Embodiment 4 FIG.
FIG. 7 is a side sectional view showing a light source device 33 according to Embodiment 4 of the present invention. In FIG. 7, the same parts as those of the light source device 10 of the first embodiment are denoted by the same reference numerals, and the description thereof is omitted.

The first reflecting mirror 2 has, as the second reflecting surface 2a, an approximately ¼ partial ellipsoidal shell inner surface in which the ellipse axis E is inclined at a predetermined angle with respect to the horizontal plane (electrode axis L).
The explosion-proof glass 4 forms an acute angle with respect to the electrode axis E.

  In the present embodiment, the ellipse axis E is inclined at a predetermined angle with respect to the electrode axis L, and the condensing point F2 is above the light source device 10 of the first embodiment. The amount of light decreases. Further, by arranging the explosion-proof glass 4 at an acute angle with respect to the electrode axis E, the incident angle of the light incident on the explosion-proof glass 4 and the reflection angle of the light reflected by the explosion-proof glass 4 are increased. The light that is difficult to be incident again and is reflected by the explosion-proof glass 4 irradiates the heat radiating portion 6 or the plane mirror 5b. Although the heat radiating part 6 or the flat mirror 5b is heated, heat is conducted to the flat mirror part 5b in contact with the heat radiating part 6, and is radiated from the flat mirror part 5b. Therefore, the discharge tube 1 is further prevented from being excessively heated, and deterioration of the discharge tube 1 due to heat is suppressed.

As described above, the light source device 33 according to the present embodiment is superior in terms of temperature compared to the conventional light source device in which the ellipse axis E and the electrode axis L coincide with each other. The amount of light emitted from the light source device 33 increases.
Accordingly, even if the first reflecting mirror 2 having a short focal length is used to reduce the size of the projector, the luminous flux does not collide with the sealing portion 14 and the lead 16, so that the molybdenum foil 15 embedded in the sealing portion 14 and The trouble that the lead 16 is oxidized does not occur, and a decrease in illuminance is avoided.

Embodiment 5 FIG.
FIG. 8 is a side sectional view showing the light source device 34 according to Embodiment 5 of the present invention. In FIG. 8, the same parts as those of the light source device 10 of the first embodiment are denoted by the same reference numerals, and the description thereof is omitted.
In the discharge tube 1 of the light source device 34 of the present embodiment, the anode 11 is disposed on the light emitting side. When the discharge tube 1 is driven by direct current, the light distribution on the anode 11 side is narrower than that on the cathode 12 side due to the difference in the size of the electrodes. Therefore, the length of the first reflecting mirror 2 in the direction of the ellipse axis E can be shortened compared with the case where the cathode 12 is arranged on the light emitting side, and the apparatus can be miniaturized.
Since the sealing portion 14 on the light emission side of the discharge tube 1 is fixed to the heat radiating portion 6 with the adhesive 8, the sealing portion 14 provided with the anode 11 having a larger amount of heat than the cathode 12 effectively radiates heat. Is done.

Since the conventional light source device does not have the heat radiating portion 6 and the sealing portion 14 of the discharge tube 1 cannot be fixed to the light emitting side as in the present embodiment, the base of the first reflecting mirror 2 is not provided. The sealing portion 14 provided with the anode 11 having a high heat quantity at the end portion had to be fixed. Therefore, since the sealing portion 14 provided with the cathode 12 having a wide light distribution is disposed on the light emitting side, it is necessary to increase the length of the first reflecting mirror 2 in the elliptic axis E direction.
In the light source device 34 of the present embodiment, since the elliptical axis E is inclined with respect to the electrode axis L and the focal point F2 is located on the upper side, the light incident on the vicinity of the proximal end portion of the first reflecting surface 2a is also collected. Can shine.

Embodiment 6 FIG.
FIG. 9 is a side sectional view showing a light source device 35 according to Embodiment 6 of the present invention. In FIG. 9, the same parts as those of the light source device 10 of the first embodiment are denoted by the same reference numerals, and the description thereof is omitted.
In the light source device 35 according to the sixth embodiment, the sealing portion 14 is fixed to the base end portions of the first reflecting mirror 2 and the flat mirror portion 5b with the adhesive 8, but the sealing portion 14 on the light emission side. Are fixed to the heat radiation part 6 and the plane mirror part 5b on the light emission side by an adhesive 8.
Therefore, it is possible to dissipate heat from both the sealing parts 14 and to control the temperature of both the sealing parts 14.

Embodiment 7 FIG.
FIG. 10 is a schematic plan view showing the internal configuration of projector 40 according to Embodiment 7 of the present invention.
The projector 40 of the present embodiment has a first fly-eye lens 42, a second fly-eye lens 43, 1 / in the traveling direction of the light emitted from the light source device 10 of the present embodiment as a part of the optical system. Two phase difference plate 44, condenser lens 46, first dichroic mirror 47, first aluminum mirror 50, second dichroic mirror 48, relay lens 49, second aluminum mirror 51, third aluminum mirror 52, field lenses 53, 55, 57, liquid crystal panels 54, 56, and 58, a color synthesis cross dichroic prism 59, and a projection lens 60. These arrangements are the same as in the conventional apparatus.

A circuit board 61 that controls lighting of the light source device 10 and image display of the liquid crystal panels 54, 56, and 58 is disposed at an appropriate location inside the housing 40a.
The first fly eye lens 42 and the second fly eye lens 43 convert light emitted from the light source device 10 into uniform light.
The 1/2 phase difference plate 44 converts the light emitted from the light source device 10 into a longitudinal wave component of the light transmitted through the liquid crystal panels 54, 56, and 58, and brightens the projected image. The first dichroic mirror 47 and the second dichroic mirror 48 are mirrors for separating the light from the light source device 10 into three primary colors of red, green, and blue. The glass is coated with a thin film that reflects light in a specific wavelength range. is there.

  The first aluminum mirror 50, the second aluminum mirror 51, and the third aluminum mirror 52 reflect the light separated by the first dichroic mirror 47 and the second dichroic mirror 48 to irradiate the field lenses 53, 55, and 57. The liquid crystal panels 54, 56, and 58 correspond to spatial light modulators, receive light passing through the field lenses 53, 55, and 57, and control light transmission and shielding for each pixel to generate an image of each color. .

The color synthesis cross dichroic prism 59 synthesizes the images generated by the liquid crystal panels 54, 56, and 58 to generate a color image. The projection lens 60 projects the color image generated by the color synthesis cross dichroic prism 59 onto the screen 65.
When a light source device that collects radiated light at a short distance is used as compared with a conventional light source device, the projector can be reduced in size. Further, when the light source device 10 having the same size as the conventional one is used, it is possible to increase the brightness of the projector.

Embodiment 8 FIG.
FIG. 11 is a schematic plan view showing the internal configuration of projector 70 according to Embodiment 8 of the present invention. In the projector 70 of the present embodiment, as a part of the optical system, a color wheel 71 is disposed so as to face the light source device 10, and a rod rental integrator 72, condenser lens 73, TIR (Total Internal reflection) prism 74, DMD 76, and projection lens 77 are provided. In addition, a circuit board 78 that controls lighting of the light source device 10 and image display of the DMD 76 is disposed at an appropriate location inside the housing 70a. These arrangements are the same as in the conventional apparatus.
Also in the present embodiment, when a light source device 70 that collects radiated light at a short distance as compared with a conventional light source device is used, the projector can be reduced in size. In addition, when a light source device 70 having the same size as that of a conventional light source device 70 is used, the brightness of the projector can be increased.

  In the seventh and eighth embodiments, the case where the light source device 10 according to the first embodiment is used as the light source device is described. However, the present invention is not limited to this, and the second, third, and fourth embodiments are described. The light source devices 20, 30, 33, 34, and 35 according to 5 and 6 may be used.

It is a perspective view which shows the light source device which concerns on the 1st Embodiment of this invention. It is a sectional side view which shows a light source device. It is the III-III line expanded sectional view of FIG. It is a sectional side view which shows the discharge tube and 2nd reflective mirror of the light source device which concern on Embodiment 2 of this invention. It is a longitudinal cross-sectional view which shows a light source device. It is a sectional side view which shows the discharge tube of the light source device which concerns on Embodiment 3 of this invention. It is a sectional side view which shows the light source device which concerns on Embodiment 4 of this invention. It is a sectional side view which shows the light source device which concerns on Embodiment 5 of this invention. It is a sectional side view which shows the light source device which concerns on Embodiment 6 of this invention. FIG. 11 is a schematic plan view showing an internal configuration of a projector according to a seventh embodiment of the invention. It is a planar schematic diagram which shows the internal structure of the projector which concerns on Embodiment 8 of this invention. It is a sectional side view which shows the conventional light source device.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1, 31 Discharge tube 11, 31a Anode 12, 31b Cathode 13, 31c Light emission part 14, 31d Sealing part 15 Molybdenum foil 16 Lead 2 1st reflective mirror 2a 1st reflective surface 4 Explosion-proof glass 5, 25 2nd reflective mirror 5a , 25a Second reflecting portion 5b, 25b Flat mirror portion 5c, 25c, 31e Second reflecting surface 6 Heat radiation portion 8 Adhesive 10, 20, 30, 33, 34, 35 Light source device 40, 70 Projector

Claims (11)

It has a spherical light emitting part and a sealing part provided continuously on both sides of the light emitting part, and a pair of electrodes are provided in a state where each tip part is opposed to the inside of the light emitting part. A discharge tube that emits light;
A first reflecting mirror that is partially elliptical and has a first reflecting surface that collects light emitted by the discharge tube;
A second reflecting mirror having a second reflecting surface for allowing the light emitted from the discharge tube to the side opposite to the first reflecting mirror side to re-enter the discharge tube;
In the light source device in which the electrode axis passing through each tip is non-perpendicular to the elliptical axis passing through the two focal points of the first reflecting mirror, and the end of the discharge tube protrudes from the back.
The light emitting unit is covered with the second reflecting surface, and both ends of the discharge tube are located on the outer peripheral side of the second reflecting surface,
A heat radiating portion covering the light emitting side sealing portion from which the light reflected by the first reflecting surface or the second reflecting surface is emitted;
The sealing unit is fixed to the heat radiating unit or the back side end of the first reflecting mirror.   2. The light source device according to claim 1, wherein a focal point of the second reflecting surface is located closer to the first reflecting mirror than a bright spot of light emitted from the light emitting unit. It has a spherical light emitting part and a sealing part provided continuously on both sides of the light emitting part, and a pair of electrodes are provided in a state where each tip part is opposed to the inside of the light emitting part. A discharge tube that emits light;
A first ellipsoid having a first reflecting surface that is partially elliptical and has a first reflecting surface for collecting the light emitted by the discharge tube;
In the light source device in which the electrode axis passing through each tip is non-perpendicular to the elliptical axis passing through the two focal points of the first reflecting mirror, and the end of the discharge tube protrudes from the back.
A second reflecting surface is formed on the surface opposite to the first reflecting mirror side of the light emitting unit to re-enter the light emitted from the bright point of the light emitted from the light emitting unit to the bright point side,
A heat radiating portion covering the light emitting side sealing portion from which the light reflected by the first reflecting surface or the second reflecting surface is emitted;
The sealing unit is fixed to the heat radiating unit or the back side end of the first reflecting mirror.   The discharge tube is a discharge tube by direct current lighting in which the pair of electrodes includes an anode and a cathode, and the sealing portion on the side where the anode is arranged is a sealing portion on the light emitting side, and is fixed to the heat dissipation portion The light source device according to any one of claims 1 to 3.   The light source device according to claim 1, further comprising a heat radiating portion that covers a sealing portion on the opposite side to the sealing portion on the light emitting side.   The light source device according to claim 1, wherein the other sealing portion of the discharge tube is fixed to a side opposite to a side to which the sealing portion is fixed.   The light source device according to any one of claims 1 to 6, wherein an ellipse axis passing through two focal points of the first reflecting mirror is non-parallel to an electrode axis passing through each of the tip portions.   The light source device according to any one of claims 1 to 7, wherein an explosion-proof glass is provided on the light emitting side in a non-perpendicular manner with respect to the electrode axis.   The light source device according to claim 8, wherein the glass is coated with an ultraviolet reflecting film.   The light source device according to claim 8, wherein the glass is coated with an infrared reflecting film. A light source device according to any one of claims 1 to 10,
A spatial light modulation element that generates modulated light according to an image with light emitted from the light source device;
A projector comprising: a projection lens that projects the modulated light generated by the spatial light modulation element onto a projection target.

Images