JP2004178944A - Light source device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a light source unit provided with an extra-high-pressure mercury discharge lamp operating with extra-high pressure when lighted which can be simply positioned with respect to an optical system even if an explosion-proof structure is adopted by increasing the thickness of a front glass located on an opening side of the light source. <P>SOLUTION: The light source device is composed of a light source unit consisting of an extra-high-pressure mercury discharge lamp having a discharge container made of quartz glass in which, not less than 0.15 mg/mm<SP>3</SP>of mercury is enclosed, having a pair of electrodes facing each other, a concave reflection mirror on the summit part of which, the extra-high pressure mercury discharge lamp is mounted, and a front glass having a lamp bulb side end face and a light-emitting side end face, covering the front side opening of the concave reflection mirror, functioning as the explosion-proof structure; and an optical system part located on the front opening side of the concave reflection mirror. The face of the light source unit contacting with the optical system part is located at a position headed to the summit part side of the concave reflection mirror from the light-emitting side of the front glass. <P>COPYRIGHT: (C)2004,JPO

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a light source device including a light source unit having an ultra-high pressure mercury discharge lamp, and more particularly to a light source unit used for a projector or the like and a unit for determining a positional relationship between an optical system unit following the light source unit. The present invention relates to a light source device.
[0002]
[Prior art]
Conventionally, a light source unit used in a light source device such as a projector is required to have high luminance and high color rendering properties when an image is projected, and recently, an ultra-high pressure mercury discharge lamp has been mainly used. . On the other hand, the demand for miniaturization of the projector itself has increased, and the demand for a portable projector has increased in place of a conventional stationary projector. Accordingly, there is a demand for miniaturization of the light source device itself such as the projector or the light source unit used in the light source device, and enhancement of the luminance of the ultra-high pressure mercury discharge lamp disposed in the light source unit. In general, increasing the brightness of the ultrahigh-pressure mercury discharge lamp is achieved by increasing the amount of mercury sealed in the discharge space of the lamp and increasing the pressure during operation. On the other hand, miniaturization of the light source unit itself is dealt with by shortening the opening diameter of the concave reflecting mirror in which the ultrahigh-pressure mercury discharge lamp is arranged and the length of the concave reflecting mirror in the optical axis direction.
[0003]
Such a light source unit is described in, for example, JP-T-2000-515311. According to the publication, in a light source unit comprising a light bulb and a reflector, the reflector base, a so-called concave reflector, has a projection-like structure called a lug on a front glass side which is a light emission window away from a reflection surface. It is described that the light source unit protrudes from the light emission side end surface of the front glass in the light emission direction, and that when the light source unit is inserted into the light source system, good positioning can be automatically performed by using the lug. Is disclosed.
[0004]
Here, a conventional light source unit provided with the lug is shown in FIGS. FIG. 10- (a) is a view of the light source unit viewed from the front glass side, FIG. 10- (b) is a cross-sectional view of the light source unit taken along the line AA ′, and FIG. It is an enlarged view. The light source unit 82 includes a concave reflecting mirror 85 provided with an ultra-high pressure mercury discharge lamp 84 and a front glass 86 provided on the opening 87 side of the concave reflecting mirror 85, and on the opening 87 side of the concave reflecting mirror 85. There is a protrusion 88 called a lug. FIG. 11- (a) is a view of the light source unit as viewed from the front glass side, FIG. 11- (b) is a cross-sectional view of the light source unit taken along the line AA ', and circled. It is an enlarged view of a part. FIG. 11 shows an example of a concave reflecting mirror having the same configuration as that of FIG. 10 and having a circular opening.
[0005]
By the way, according to the above-mentioned publication, a protrusion 88 called a lug protrudes from the light exit side end face 86 b of the front glass 86 provided on the opening 87 side of the concave reflecting mirror 85 toward the optical system side in the light emission direction. Thus, the positional relationship with the optical system can be determined without damaging the front glass 86.
[0006]
However, the pressure at the time of lighting of the ultra-high pressure mercury discharge lamp 84 has become extremely high in accordance with recent requirements, and when the ultra-high pressure mercury discharge lamp 84 ruptures due to some trouble, fragments are scattered, and furthermore, There is a problem that the debris damages the optical system in the projector. Therefore, it is necessary to provide the front glass 86 provided on the concave reflecting mirror opening 87 side of the light source unit 82 with an explosion-proof structure, which has conventionally been dealt with by increasing the thickness of the front glass 86. .
[0007]
Further, a recent light source unit 82 uses an elliptical mirror for condensing light emitted from the ultra-high pressure mercury discharge lamp 84 in a very narrow area, and the like. It is necessary to arrange the space between them with very high precision.
[0008]
However, when the thickness of the front glass 86 is increased as an explosion-proof structure, the length of the projection 88, which is called a lug according to the invention described in the above publication, becomes longer in the optical axis direction, and the concave reflecting mirror Variations in dimensions are increased due to distortion or the like generated during formation. This variation is particularly noticeable when the lugs are provided discontinuously on the outer periphery of the concave reflecting mirror (FIGS. 10 and 11). As a result, there has been a problem that even if the light source unit 82 is incorporated in the optical system with reference to the protrusion 88 referred to as a lug, good positioning cannot be automatically performed. Further, if the portion of the protrusion 88 called a lug is lengthened, the mechanical strength of the portion of the protrusion 88 decreases, and if the protrusion 88 is hit when assembled into a projector or the like, the protrusion 88 is damaged. There was a problem.
[0009]
Further, as in the case of the small concave reflecting mirror 85 shown in FIG. 12, the projection 89 continuously provided on the outer peripheral portion of the concave reflecting mirror 85 has a partially thin portion so that mechanical There was also a problem that the strength was reduced. On the other hand, when the thickness of the projections 88, 89 is increased in order to secure the strength of the projections 88, 89, the radial dimension of the light source unit 82 increases, and the demand for miniaturization from the market is met. There was a problem that it could not be done. Further, if the thickness of the projections 88 and 89 is increased while keeping the size of the light source device 82 in the radial direction small, there is a problem that the opening diameter of the light source unit 82 becomes small and a required amount of light cannot be obtained. Was.
[0010]
[Patent Document 1]
JP 2000-515311 A
[Problems to be solved by the invention]
In a light source unit equipped with an ultra-high pressure mercury discharge lamp that operates at an ultra-high pressure when turned on, even when an explosion-proof structure is adopted by increasing the thickness of the front glass disposed on the opening side of the light source unit, the arrangement with the optical system unit It is an object of the present invention to provide a light source unit that can easily determine the light source unit. Another object is to provide a light source device including the light source unit.
[0012]
[Means for Solving the Problems]
A light source device of the present invention, in the discharge vessel made of quartz glass is 0.15 mg / mm ³ of mercury is sealed, and the ultra-high pressure mercury discharge lamp having a pair of oppositely disposed electrodes, ultra-high pressure mercury A light source unit comprising: a concave reflecting mirror having a discharge lamp disposed on the top side; a front glass having an end face on the lamp bulb side and a light emitting side end face and also serving as an explosion-proof structure covering the front opening side of the concave reflecting mirror; An optical system disposed on the front opening side of the concave reflecting mirror, the surface of the light source unit abutting on the optical system is configured such that the concave surface reflects the concave surface of the front glass from the light exit side end surface of the front glass. The mirror is provided on the top side of the mirror.
[0013]
With this configuration, even if a thicker front glass is used as the explosion-proof structure, it is possible to have a surface serving as a reference for determining the position of the light source unit without increasing the size of the concave reflecting mirror. Further, in the light source device, the position of the light source unit can be easily determined by abutting the projection-shaped portion provided on the optical system portion with the reference surface, and the light emitted from the ultrahigh-pressure mercury discharge lamp can be easily determined. The emitted light can be used effectively.
[0014]
Further, the light source device of the present invention is characterized in that a surface of the light source unit abutting on the optical system portion is provided between a lamp bulb side end surface and a light emission side end surface of the front glass.
[0015]
Thereby, the side surface portion of the front glass parallel to the optical axis serves as a guide when the light source unit is attached to the optical system unit, while maintaining the positional accuracy between the light source unit and the optical system unit. There is an advantage that it can be easily attached.
[0016]
Furthermore, the surface of the light source unit that contacts the optical system is provided as a continuous surface around the front opening.
[0017]
Accordingly, the light source unit can be accurately arranged in the light source device without having a complicated structure near the front opening of the concave reflecting mirror. Further, since the surface of the concave reflecting mirror that abuts on the optical system is formed as a continuous surface around the front opening of the concave reflecting mirror, distortion or the like generated from a complicated structure is reduced, and the concave reflecting mirror is reduced. There is an advantage that its own mechanical strength is improved, and a further explosion-proof effect can be enhanced.
[0018]
Alternatively, the surface of the light source unit which comes into contact with the optical system is provided as at least three surfaces discontinuously surrounding the front opening.
[0019]
Thus, the position of the light source unit and the optical system can be easily determined in the light source device, and the light emitted from the extra-high pressure mercury discharge lamp can be effectively used.
[0020]
Further, the light source unit of the present invention includes an ultrahigh-pressure mercury discharge lamp having a discharge vessel made of quartz glass filled with 0.15 mg / mm ³ or more of mercury, and having a pair of opposed electrodes. In a light source unit comprising a concave reflecting mirror having a high-pressure mercury discharge lamp disposed on the top side, and a front glass having an end face on a lamp bulb side and an end face on a light emitting side and also serving as an explosion-proof structure covering a front opening of the concave reflecting mirror. An end of the concave reflecting mirror that protrudes most toward the front opening is provided on the top side of the concave reflecting mirror with respect to the light exit side end surface of the front glass.
[0021]
Thereby, even when the thickness of the front glass is increased when the light source unit is arranged in the light source device, the light source unit is accurately arranged using the end most protruding toward the opening side of the concave reflecting mirror. It is possible to do.
[0022]
BEST MODE FOR CARRYING OUT THE INVENTION
FIG. 1 shows a first embodiment of the light source device of the present invention. A light source device 1 according to the present invention includes a light source unit 2 and an optical system unit 3 for taking in light emitted from the light source unit 2. The light source unit 2 includes a concave reflecting mirror 5 for reflecting light emitted from the ultra-high pressure mercury discharge lamp 4 and a front glass 6 arranged on the front opening 5b side of the concave reflecting mirror 5. The front glass 6 has two end faces, a lamp bulb side end face 6a and a light emission side end face 6b. In addition, an integrator lens 10, a polarization conversion element 11, a condenser lens 12, a condenser lens 13, a spatial modulation element 14, a projection lens 15, and the like are arranged in the optical system section 3, and the light source unit 2 is in contact with the A reference surface 16 for determining the position of the light source unit 2 is provided as a projection 17. Further, for example, a liquid crystal substrate or a digital mirror device can be mounted on the spatial modulation element 14. High precision is required for the positional relationship between the light source unit 2 and the optical system unit 3, and the projection 17 provided on the optical system unit 3 side is used as a reference surface, and the concave reflecting mirror 5 is used. The front end face 8a of the protruding portion 8 most protruding toward the front opening 5b is positioned for positioning. In the present invention, the front end face 8 a is provided on the top 5 a side of the concave reflecting mirror 5 from the light emission side end face 6 b of the front glass 6. In the first embodiment, the light source unit 2 is provided as a projection 8 at each apex of the opening 7 of the concave reflecting mirror 5 having a substantially square shape as a portion contacting the reference surface 16. The position of the front end surface 8a, which is the end of the protruding portion 8 on the front opening 5b side, is on the end surface in the direction parallel to the optical axis of the front glass 6, that is, between the lamp bulb side end surface 6a and the light emitting side end surface 6b. It is provided between them. In this embodiment, a heat-resistant glass plate material of about 5 mm was used because the thickness of the front glass 6 also serves as an explosion-proof structure.
[0023]
With this configuration, there is an advantage that the position of the light source unit 2 can be accurately determined without increasing the size of the concave reflecting mirror 5 even when the front glass 6 having a large thickness is used as the explosion-proof structure. .
[0024]
Next, an ultra-high pressure mercury discharge lamp 4 arranged in the light source unit 2 is shown in FIG. In the ultrahigh-pressure mercury discharge lamp 4, electrodes made of a high melting point metal such as tungsten, for example, a cathode 22 and an anode 23 are arranged inside a bulb section 24 made of quartz glass so as to face each other. A rare gas such as an argon gas and mercury 28 are sealed. Further, at both ends of the bulb 24, there are protruding sealing portions 27. The sealing portion 27 is connected to the metal foil 21 electrically connected to the anode 23 and the cathode 22, and is connected to the metal foil 21. It comprises an external lead 25. One of the external leads 25 is provided with a base 26, and the other is connected to a power supply lead wire 20. In this embodiment, for example, the ultrahigh-pressure mercury discharge lamp has a bulb diameter of Φ10 mm, a front length of 60 mm, a diameter of a sealing portion 27 protruding from the bulb 24 of Φ5.8 mm, and a distance between electrodes of about 1 mm. , the said valve 24 the mercury 28 is 0.15 mg / mm ³ or more, Br gas is ^{4 × 10 - 4 μmol / mm} 3 about is sealed, but the input power 130W. It should be noted that although a DC type lamp has been shown for the sake of explanation, a lamp having an inverted arrangement of electrodes or an AC type lamp may be used.
[0025]
Next, the optical system section 3 will be described. The optical system unit 3 is provided with optical system components such as the above-described lens. FIG. 3 shows an embodiment of a joint part between the light source unit 2 and the optical system unit 3 which is a part of the optical system unit 3. 3A is a cross-sectional view, FIG. 3B is a view from the front opening 5b side of the light source unit, and FIG. 3C is an enlarged view of a portion surrounded by a circle shown in FIG. . The light source unit 2 composed of the concave reflecting mirror 5 in which the ultra-high pressure mercury discharge lamp 4 is disposed has a projection 17 formed on a light source unit holder 32 which is a part of the optical system unit 3. The distal end surface 8a of the protruding portion 8 is abutted and fixed. The front end face 8a is located between the light emitting side end face 6b of the front glass 6 and the lamp bulb side end face 6a, and the projecting portion 17 is formed between the front end face 8a and the light emitting side end face 6b. Abuts on the side of the top 5a. In the present embodiment, the position of the light source unit 2 is determined by using the protruding portion 17, and is fixed so as to sandwich the end of the light source unit 2 by using, for example, a pin 31.
[0026]
FIG. 4 shows a first embodiment of the light source unit 2 according to the present invention. FIG. 4A is a front view of the light source unit 2 as viewed from the front opening 5b side. FIG. 4B is a cross-sectional view taken along the line AA ′ and an enlarged view of a portion surrounded by a circle. This embodiment shows a case where the shape of the front opening 5b is substantially rectangular. A projecting portion 8 is formed on the opening side end 9, and a tip end surface 8 a which is a tip of the projecting portion 8 is closer to the top 5 a of the concave reflecting mirror 5 than the light emitting side end surface 6 b of the front glass 6. It is formed so that it becomes. Specifically, the front end face 8a is provided between the lamp bulb side end face 6a and the light emission side end face 6b.
[0027]
Note that the shape of the concave reflecting mirror 5 used for the light source unit 2 can be substantially circular as shown in FIG. FIG. 5- (a) is a front view of the light source unit 2 as viewed from the front opening 5b side, and FIG. 5- (b) is a cross-sectional view of the light source unit 2 as viewed along the line AA ′. Other symbols are the same as those in FIG. In the case of FIG. 5 as well, a protruding portion 8 is formed at the opening side end portion 9, and a front end surface 8 a which is a front end of the protruding portion 8 is a lamp bulb side end surface 6 a of the front glass 6 and a light emitting side end surface. 6b.
[0028]
Next, a second embodiment of the present invention is shown in FIGS. FIG. 6A is a front view of the light source unit 2 as viewed from the front opening 5b side. In the case of a substantially square concave reflecting mirror, FIG. FIG. FIG. 7A is a front view of the light source unit 2 as viewed from the front opening 5b side. In the case of a substantially circular concave reflecting mirror, FIG. FIG. In the second embodiment, the projection 8 shown as the first embodiment is provided continuously around the concave reflecting mirror 5. The front end face 8a of the projection 8 is provided between the lamp bulb side end face 6a and the light emission side end face 6b of the front glass 6, and the length of the projection 8 in the optical axis direction is It is about 3.8 mm from the end face 6a on the lamp bulb side of the front glass 6.
[0029]
Thus, the light source unit 2 can be accurately arranged without giving the front opening 7 of the concave reflecting mirror 5 a complicated structure. Further, since the protruding portion 8 is formed as a surface continuous around the front opening 7 in the concave reflecting mirror 5, distortion or the like generated from a complicated structure is reduced, and the mechanical structure of the concave reflecting mirror 5 itself is reduced. There is an advantage that the target strength is improved and the further explosion-proof effect can be enhanced.
[0030]
FIG. 8 shows a third embodiment of the present invention. FIG. 8A is a front view of the light source unit 2 as viewed from the front opening 5b side. In the case of a substantially square concave reflecting mirror, FIG. FIG. In the third embodiment, the opening-side end 9 of the concave reflecting mirror 5 also serves as a reference surface for determining the position with respect to the optical system 3. Here, as in the first and second embodiments described above, a tip 8a which is the tip of the projection 8 is provided between the lamp bulb side end face 6a and the light emission side end face 6b of the front glass 6. Instead, there is a reference surface on the side of the top 5a of the concave reflecting mirror 5 from the light exit side end surface 6b of the front glass. In FIG. 8, the surface is simply referred to as a reference surface portion 16. That is, the front glass 6 is fixed to the reference surface 16, and is joined to the optical system 3 by using the reference surface 16, which is wider than the front glass 6 in the outer peripheral direction.
[0031]
Thereby, the surface parallel to the optical axis of the front glass 6 serves as a guide when the light source unit 2 is attached to the optical system 3, and the positional accuracy between the light source unit 2 and the optical system 3 is adjusted. There is an advantage that it can be easily attached while maintaining the same. There is also an advantage that processing is easy. FIG. 9 shows a case where the shape of the concave reflecting mirror 5 used in the light source unit 2 is substantially circular, as in the case of the concave reflecting mirror having the above-described substantially circular opening. 9A is a front view of the light source unit 2 as viewed from the front opening 5b side, and in the case of a substantially circular concave reflecting mirror, FIG. 9B is a cross-sectional view of the light source unit 2 taken along the line AA '. FIG. 2 is a cross-sectional view when viewed in FIG. Also in this case, the reference surface 16 is not provided between the lamp bulb side end surface 6a of the front glass 6 and the light emission side end surface 6b, but rather from the light emission side end surface 6b of the front glass 6. A surface serving as a reference is provided on the top 5a side of the concave reflecting mirror 5.
[0032]
【The invention's effect】
The light source device of the present invention provides a front glass having a thicker explosion-proof structure by providing a surface that comes into contact with an optical system part on the top side of the concave reflecting mirror from the light emission side end surface of the front glass disposed in the light source unit. Even if it is used, there is an effect that a surface serving as a reference for determining the position of the light source unit can be provided without increasing the size of the concave reflecting mirror. Further, there is an advantage that the position of the light source unit can be easily determined in the light source device, and the light emitted from the extra-high pressure mercury discharge lamp can be effectively used.
[0033]
In addition, by forming the reference surface as at least three surfaces that are continuous or discontinuous around the front opening of the concave reflecting mirror, distortion or the like generated from a complicated structure is reduced. In addition, there is an advantage that the mechanical strength of the concave reflecting mirror itself is improved, and the explosion-proof effect can be further enhanced.
[Brief description of the drawings]
FIG. 1 is an explanatory view showing a light source device according to the present invention; FIG. 2 is a schematic view of an extra-high pressure mercury discharge lamp according to the present invention; FIG. 3 is an explanatory view showing a part of an optical system according to the present invention; FIG. FIG. 5 is a diagram showing a first embodiment of the present invention. FIG. 6 is a diagram showing a second embodiment of the present invention. FIG. 7 is a second embodiment of the present invention. FIG. 8 is a diagram showing an example. FIG. 8 is a diagram showing a third embodiment of the present invention. FIG. 9 is a diagram showing a third embodiment of the present invention. FIG. 10 is an explanatory diagram showing a conventional light source unit. FIG. 12 is an explanatory view showing a conventional light source unit. FIG. 12 is an explanatory view showing a conventional light source unit.
REFERENCE SIGNS LIST 1 light source device 2 light source unit 3 optical system unit 4 ultra-high pressure mercury discharge lamp 5 concave reflecting mirror 5 a top 5 b front opening 6 front glass 6 a lamp bulb side end surface 6 b light emission side end surface 7 opening 8 protruding portion 8 a front end surface 9 Opening end 10 Integrator lens 11 Polarization conversion element 12 Condensing lens 13 Condenser lens 14 Spatial modulation element 15 Projection lens 16 Reference surface 17 Projection 20 Lead wire 21 Metal foil 22 Cathode 23 Anode 24 Valve section 25 External lead 26 Base Part 27 Sealing part 28 Mercury 31 Pin 32 Holder 82 Light source unit 84 Ultra-high pressure mercury discharge lamp 85 Concave reflecting mirror 86 Front glass 86b Light emitting side end face 87 Opening 88 Projecting part 89 Projecting part

Claims (5)

An ultra-high pressure mercury discharge lamp equipped with a pair of electrodes disposed opposite to each other, in which a mercury of 0.15 mg / mm ³ or more is sealed in a discharge vessel made of quartz glass, and the ultra-high pressure mercury discharge lamp is arranged on the top side A light source unit comprising: a concave reflecting mirror having an end face on the lamp bulb side and a light emitting side end face having an explosion-proof structure covering the front opening side of the concave reflecting mirror; and a front face of the concave reflecting mirror In a light source device comprising an optical system disposed on the opening side,
A light source device, wherein a surface of the light source unit which is in contact with the optical system is provided on a top side of the concave reflecting mirror from a light emission side end surface of the front glass. The light source device according to claim 1, wherein a surface of the light source unit that contacts the optical system is provided between a lamp bulb side end surface and a light emission side end surface of the front glass. The light source device according to claim 1, wherein a surface of the light source unit that contacts the optical system is provided as a continuous surface around the front opening. The surface of the light source unit that contacts the optical system is provided as at least three surfaces that are discontinuous around the front opening. Light source device. An ultra-high pressure mercury discharge lamp equipped with a pair of electrodes disposed opposite to each other, in which a mercury of 0.15 mg / mm ³ or more is sealed in a discharge vessel made of quartz glass, and the ultra-high pressure mercury discharge lamp is arranged on the top side A light source unit comprising: a concave reflecting mirror, and a front glass having an end face on a lamp bulb side and an end face on a light emitting side and also serving as an explosion-proof structure for covering a front opening of the concave reflecting mirror.
A light source unit, wherein an end of the concave reflecting mirror that projects most toward the front opening side is provided on a top side of the concave reflecting mirror with respect to a light exit side end face of the front glass.

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