JP2009176443A - Light source device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a light source device having a short arc lamp and a concave reflecting mirror and allowing an arc tube part of the short arc lamp to be effectively and efficiently cooled to an appropriate temperature. <P>SOLUTION: The light source device includes the short arc lamp comprising the arc tube having an arc tube part and a rod-like sealing tube part; an outer tube arranged around the arc tube; the concave reflecting mirror for reflecting light from the lamp to emit the light from a light projection port; a front plate for covering the light projection port; and a cooling fluid supply means. The arc tube part is stored in a liquid-tight state by the outer tube, and a sealed space is formed by the concave reflecting mirror and the front plate. A cooling fluid is filled in the sealed space to flow through, thus cooling the short arc lamp. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a light source device including a short arc lamp and a reflecting mirror, for example, a projector such as a digital cinema (registered trademark) such as DLP (digital light processing: registered trademark) using DMD (digital micromirror device: registered trademark). The present invention relates to a light source device mounted on a liquid crystal projector device, a projector, or the like.

As a light source for a liquid crystal projector device, a short arc type short arc lamp in which a large amount of mercury is enclosed in an arc tube is known, and is used as an integrated light source device to which a concave reflecting mirror is attached.
Such a light source device often uses a nearly sealed light source device as a countermeasure when an arc tube used as a light source is ruptured. It is required to reduce the size by reducing the distance from the tube, more specifically, the distance between the concave reflecting mirror and the arc tube portion forming the light emitting space.
If the distance between the concave reflector and the arc tube is shortened more than before, the concave reflector receives heat from the lamp and becomes high temperature. In addition to the deterioration of the reflective surface, the substrate itself is also very thermally It will be a difficult situation.

In addition, the short arc lamp according to the light source device has a tendency to increase the amount of mercury enclosed in the arc tube because of the high pressure for the purpose of improving the luminance. As a result, the temperature reached by the arc tube will increase further due to the arc, but if the cooling to protect the concave reflector and arc tube becomes excessive, the arc tube temperature will decrease and mercury will not evaporate. It becomes a state and stays at the bottom, which causes the arc to fluctuate and the desired brightness cannot be obtained.
Accordingly, in accordance with the heat generation distribution of the arc tube, appropriate cooling is required so that the upper portion of the arc tube portion is sufficiently cooled while the lower portion does not hinder the evaporation of mercury.

That is, it is said that the point of cooling the arc tube portion in the short arc lamp according to the above application is largely as follows.
1. Upper part of the arc tube: Strong cooling is required because it reaches the highest temperature.
2. Lower part of the arc tube: It is hardly necessary to cool because the temperature is difficult to rise.

  In the past, various cooling structures and methods have been proposed for thermal problems inside the light source device, such as sending cooling air into the concave reflecting mirror toward the lamp or providing heat radiation fins on the lamp body or mirror. Has been adopted. For example, Patent Documents 1 and 2 disclose a method in which an arc tube of a lamp is directly cooled by wind by blowing air into a concave reflecting mirror to which a short arc lamp is fixed.

JP 2000-082322 A JP 2000-352762 A

  Specifically, the technology described in Patent Document 1 is a light source device for a liquid crystal projector, and in order to prevent overheating of the upper part due to convection, the cooling air is directed toward the upper side of the arc tube with directivity. is there. In order to perform cooling with directivity in this way, it is necessary to create a differential pressure inside and outside the light source unit, and a projector or the like needs to be equipped with a cooling fan. Depending on the performance of the air-cooled fan, it is inevitable that the noise of the fan will increase in the type that creates a large differential pressure, and restricting the sound and size of the fan will also limit its cooling capacity. .

By the way, recently, in the light source device, in addition to a relatively small data projector device for indoor use, a large projector device, for example, a video projection device that projects an image on a large screen such as a movie theater. Application development is under consideration. For this reason, the main power input to the lamp in the current application is 100 to 200 W, but a high input of 300 W or more is expected, for example.
In cooling with a fan such as those described in Patent Documents 1 and 2, it is very difficult to maintain the temperature of the arc tube portion at 1000 ° C. or less, which is a heat resistant temperature.

  Therefore, the problem to be solved by the present invention is to provide a light source device including a short arc lamp and a concave reflecting mirror capable of effectively and efficiently cooling the arc tube portion of the short arc lamp to an appropriate temperature. There is.

In order to solve the above problems, a short arc lamp according to the present invention has the following configuration.
(1) An arc tube having an arc tube portion that forms a light emitting space therein, a sealing tube portion continuously provided at both ends of the arc tube portion, and a pair of electrodes disposed to face the inside of the arc tube portion; A short arc lamp comprising mercury enclosed in the arc tube portion;
A translucent outer tube,
A concave reflector having a light projection port for emitting radiation light from the short arc lamp at its front end and a neck at its rear end;
A front plate having translucency covering the light projection port;
Cooling fluid supply means,
An outer tube is disposed inside the concave reflecting mirror, with the short arc lamp being accommodated therein,
A substantially sealed space is formed by the concave reflecting mirror, the front plate, and the outer tube, and a cooling fluid flows through the space.
(2) In the above, it is preferable that one end portion of the outer tube is welded to the sealing tube portion of the short arc lamp.
(3) An arc tube having an arc tube portion that forms a light emitting space therein, a sealing tube portion continuously provided at both ends of the arc tube portion, and a pair of electrodes disposed to face the inside of the arc tube portion; A short arc lamp comprising mercury enclosed in the arc tube portion;
A translucent outer tube,
A concave reflector having a light projection port for emitting radiation light from the short arc lamp at its front end and a neck at its rear end;
A front plate having translucency covering the light projection port;
Cooling fluid supply means,
The outer tube inside the concave reflecting mirror, one end and the other end of the outer tube are fixed and held by the front plate and the concave reflecting mirror, respectively.
The short arc lamp is disposed inside the outer tube,
A light source device, wherein a substantially sealed space is formed by a concave reflecting mirror, a front plate, and an outer tube, and a cooling fluid is passed through the space.
(4) The short arc lamp is characterized in that a part of the arc tube portion is in contact with the outer tube.
(5) Further, the concave reflecting mirror is characterized in that the substrate is made of metal and the cooling fluid is made of ion-exchanged water.

  That is, the present invention adopts the water cooling method in order to satisfy the cooling requirements as described above. When a double-tube type water cooling jacket (for example, JP-A-54-99370) used for a long arc type discharge lamp known in the art is used, there are 2 glass walls between the lamp and the reflecting surface. There will be intervening sheets. On the other hand, in the present invention, the cooling fluid is circulated in the reflecting mirror and used as a water cooling jacket, so that only one glass wall (only the wall constituted by the outer tube) is required. The light quantity loss at the time of doing is suppressed, and a practical structure can be obtained.

  Further, in the present invention, by forming a contact portion between the lamp and the outer tube, the portion where cooling is necessary is actively cooled, and the portion between the arc tube and outer tube is formed where cooling is unnecessary. By increasing the size, the cooling effect can be reduced, and cooling can be performed in accordance with various parts of the lamp.

  According to the present invention, an outer tube is provided around the arc tube portion, and a cooling fluid is circulated between the outer tube and the reflector to comprehensively cool the arc tube and the concave reflector of the short arc lamp. In addition, it is possible to perform appropriate cooling according to various places, such as performing strong cooling on portions that are easily overheated in the arc tube section and suppressing overcooling on portions that do not require cooling.

<First Embodiment>
A first embodiment of the present application will be described with reference to FIG.
FIG. 1 is an explanatory cross-sectional view of a light source device body according to the present invention cut along a tube axis. In FIG. 1, the light source device includes a short arc lamp 10 that is a light source and the short arc lamp 10. The light source device reflects the radiated light from the short arc lamp 10 and transmits the reflected light to the front opening. A concave reflecting mirror 20 that projects through the plate, and a plate-shaped front glass 40 that is disposed in close contact with the front opening of the concave reflecting mirror 20. Hereinafter, each configuration will be described in detail.

<Short arc lamp>
The short arc lamp 10 is, for example, an ultra high pressure mercury lamp. The main body of the short arc lamp 10 is made of quartz glass, and the arc tube portion 12 that forms a substantially elliptical light-emitting space therein, and the tube axially outward, that is, the front and rear in the axial direction, following both ends thereof. The arc tube 11 is composed of rod-shaped sealing tube portions 13a and 13b extending in the direction. In such an ultra-high pressure mercury lamp, the arc tube portion 12 is usually formed with a spherical outer surface or a spheroidal spherical outer surface, but in this example, the arc center has the same diameter portion (a flat portion on the paper surface). ).
An outer tube 17 is disposed around the lamp body so as to surround at least the arc tube portion 12. The outer tube 17 is also made of a material transparent to light, preferably quartz glass.

The main body portion of the short arc lamp 10 is accommodated inside the outer tube 17 with a contact portion K so that at least a part of the outer peripheral surface of the arc tube portion 12 contacts the inner peripheral surface of the outer tube 17. The front end 17A of the outer tube 17 is integrally formed by welding to the sealing tube portion 13a. The contact portion K between the arc tube 11 and the outer tube 17 is located at the most heated place due to the influence of convection while the lamp is lit. Specifically, the axis of the short arc lamp 10 is in the horizontal direction. When supported, it is the upper part in the vertical direction.
By providing such a configuration, the heat of the arc tube portion 12 is easily released to the cooling fluid that circulates to the outside via the outer tube 17, and the portion is reliably cooled.
In particular, in this example, the entire region of the arc tube portion 12 in the same diameter portion region is in contact with the inner peripheral surface of the outer tube 17, and the arc tube portion 12 has a spherical shape (or a spheroidal shape). Thus, a wider contact area can be obtained, and a large cooling effect can be obtained.

Inside the light emitting space of the short arc lamp 10, a pair of electrodes E1, E2 are arranged so as to face each other. The arc tube portion 12 is filled with a rare gas as a lighting start gas, a halogen for suppressing blackening of the inner wall of the arc tube portion 12, and mercury as a luminescent material. The electrodes E1 and E2 are electrically connected to the metal foils 15a and 15b and the external lead bars 16a and 16b, respectively, and the metal foils 15a and 15b are embedded in the sealed tube portions 13a and 13b in an airtight state. ing. A coil 14b is interposed around the base portion (quartz glass embedded portion) of the electrode E2 in order to buffer the contact with the quartz glass.
In the figure, W1 is a power supply line connected to the external lead rod 16a. The power supply line W1 is taken out from a lead wire outlet hole 24 provided in the concave reflecting mirror 20, and the periphery thereof is liquid-tightly sealed with an adhesive S.
A base 18 is fixed to a rear end 17B of the outer tube 17 with a sealing material S made of a heat-resistant inorganic adhesive. As described above, the short arc lamp 10 is accommodated in the space sealed by the outer tube 17 and the base 18 in a state where the one sealing portion 13a is welded to and supported by the one end portion 17A of the outer tube 17. ing.
In order to obtain an indirect cooling effect due to heat conduction, it is desirable to enclose an appropriate gas inside the short arc lamp 10 and the outer tube 17, which is effective and simply air, for example, the same as atmospheric pressure. Enclosed to the extent. When the short arc lamp 10 is operated, the gas (air) enclosed in the outer tube 17 is also expanded by the heat from the arc. However, even when the pressure is increased by the thermal expansion, such a high pressure state is reached. Therefore, it can be used without any problem without impairing the airtightness and pressure resistance of the outer tube 17 and the base 18. Of course, the enclosure inside the outer tube 17 is not limited to air, and the enclosure pressure is not limited to the above as long as the mechanical strength can be maintained.

The amount of mercury enclosed in the arc tube 12 is 0.08 mg / mm ³ or more, for example, 0.1 mg / mm ³ , thereby achieving a high operating pressure of 10 MPa or more when the lamp is turned on.

  Further, specific numerical examples regarding the short arc lamp 10 will be described. The distance between the electrodes is, for example, 1.5 mm, and the maximum diameter portion of the arc tube portion 12 surrounding the light emitting space has an inner diameter of 9 mm and an outer diameter. 13 mm. The thickness of the outer tube is 0.7 to 2 mm, particularly preferably 1 to 1.5 mm. A method for manufacturing the short arc lamp 10 including the outer tube 17 will be described in detail later.

<Concave reflector>
The concave reflecting mirror 20 includes a condensing unit 21 having a base 20a made of, for example, borosilicate glass and having a concave shape to form a condensing space, and a light projection port 22 at the front end (left end in FIG. 1) of the condensing unit 21. And a cylindrical neck portion 23 extending rearward in the optical axis direction following the rear end 21b (right end in FIG. 1) of the light collecting portion 21. A reflection layer 21 </ b> A is formed on the inner surface of the light collecting portion 21 to form a reflection surface. In addition to the borosilicate glass, the substrate 20a may be other glass such as quartz glass or crystallized glass.

The condensing part 21 of the concave reflecting mirror 20 is formed with an appropriate curved surface such as a spheroid or a paraboloid of revolution by combination with an optical element arranged in front. The reflective layer 21A is made of, for example, a dielectric multilayer film, and is made of, for example, a film having a thickness of 0.5 to 10 μm in which silica (SiO ₂ ) layers and titania (TiO ₂ ) layers are alternately stacked. This reflective film mainly has a function of transmitting light in the infrared region and ultraviolet region and reflecting visible light.

  Further, the concave reflecting mirror 20 is formed with through holes 25 and 26 at the upper and lower positions in the vertical direction, and sheath tubes 27 and 28 communicating with the internal space in the concave reflecting mirror 20 are mounted. For example, the supply port for the cooling fluid is formed by the sheath tube 27 positioned at the upper portion, and the discharge port for the cooling fluid is formed by the sheath tube 28 positioned at the lower portion. Of course, the method of circulating the cooling fluid is not limited to this.

<Front glass>
The front glass 40 is transparent to light and is preferably made of quartz glass or borosilicate glass. The concave reflecting mirror 20 is formed into a shape along the front opening edge 22A.

As described above, the short arc lamp 10, the outer tube 17, the concave reflecting mirror 20, and the front glass 40 are provided to constitute the light source device according to the present invention. Here, the concave reflecting mirror 20 and the short arc lamp 10 are arranged so that the position of the arc in the short arc lamp 10 coincides with the position of the focal point of the reflecting surface in the concave reflecting mirror 20 (the first focal point in the case of a spheroidal surface). , The sealing tube portion 13b is inserted into the cylindrical neck portion 23 of the concave reflecting mirror 20 together with the end portion 17B of the outer tube 17, and is liquid-tight with a sealing material S made of a silicon-based resin adhesive. Bonded and fixed.
On the other hand, the light projection port 22 of the concave reflecting mirror 20 is closed by the front glass 40 being disposed, and a sealing material (not shown) made of a silicon-based or epoxy-based adhesive or the like over the entire front opening edge 22A. Are liquid-tightly bonded and fixed.

  FIG. 2 is a view schematically showing a cooling fluid circulation system introduced into the light source device shown in FIG. In the following description, an example using pure water (ion exchange water) as the cooling fluid will be described. Pure water is highly transmissive with respect to light having a wavelength of 600 nm or less including the visible light region, and does not cause electrical conduction. Therefore, it can be used without any problem even if the external lead rod (16a) or the lead wire (W1) is immersed. . In the subsequent stage, the cooling fluid is simply referred to as “cooling water”.

The cooling water flowing from the light source device is temporarily stored in a water storage tank (not shown), and the water temperature is cooled to 40 ° C. or less, preferably 30 ° C. or less by the cooling means 45 including a radiator and a Peltier element. After cooling, water is pumped from the water storage tank by the pump 46, supplied to the light source device, passes through the sheath tube 27, and inside the concave reflecting mirror 20, that is, the concave reflecting mirror 20, the front plate 40, and the outer tube 17. The cooling water is introduced into the inside of the substantially sealed space formed by, and flows between the light collecting portion and the outer tube 17 in the short arc lamp 10, and is sent again to the circulation system through the other sheath tube 28. .
In this way, the cooling water flows through the concave reflecting mirror 20, whereby the outer tube 17 is cooled, and the arc tube 11 is cooled directly or indirectly by the outer tube 17. Here, in the arc tube 11, due to the influence of convection, the upper portion of the arc tube portion 12 is likely to be overheated. However, since the upper portion of the arc tube portion 12 is circumscribed by the outer tube 17, the arc tube portion 12 is reliably and effectively. The part is cooled.

As a result, the temperature of the arc tube can be reliably maintained below about 1000 ° C., which is the heat resistant temperature of quartz glass, and the lamp can be lit stably.
In this way, it is possible to control the temperature of the cooling medium to be circulated by using cooling water, and to perform cooling suitable for the part of the arc tube through the wall by the outer tube, so that it is lit even at high input However, it is possible to maintain a stable lighting state, and it is possible to realize a high lamp input even with the same specification.

  Here, the distance between the maximum outer diameter portion and the outer tube in the arc tube portion of the arc tube is preferably in the range of 0 to 0.1 mm in the upper part, while it is preferable to provide an interval of 1 mm or more in the lower part. . This is because strong cooling is necessary at the upper portion of the arc tube portion 12 and it is preferable that the outer tube is substantially in contact (close contact) during the lighting operation, while cooling is unnecessary at the lower portion. This is to suppress the occurrence of mercury non-evaporation due to overcooling of the arc tube. Since the glass of the bulging portion of the arc tube is arranged in contact with or in close contact with the inner tube, the arc tube portion is reliably cooled, and the temperature of the lamp and the concave reflector can be reliably controlled. Even when the input power is increased to 300 W or more, a stable temperature state can be maintained, and the arc tube 11 is not devitrified, clouded, or damaged, and can be maintained below the expected temperature. It becomes possible.

  Moreover, according to such a configuration, the metal foil of the short arc lamp and the overheating of the external lead rod are directly cooled by the cooling water in the front side sealing tube portion (13a), and the sealing is performed. The member on the tube portion 13a side is effectively cooled, and oxidation of the metal foil 15a, the external lead rod 16a, etc. can be reliably prevented.

  As a result, even when the input power to the lamp is as high as 300 W or more, overheating of the arc tube portion is suppressed, and problems such as white turbidity (recrystallization of silica glass) and melting of the arc tube portion are surely prevented. This can be avoided, and high input of the lamp can be realized.

Here, with reference to FIG. 3 (a)-(f), the manufacturing method of the short arc lamp provided with the outer tube | pipe which concerns on this invention is demonstrated.
(A)-(e) is an axial sectional view of the glass body (glass structure) or lamp tube constituting the lamp, and (f) is a sectional view cut along AA ′ in (e).
(1) FIG. 3A shows a glass tube 50 for arc tube construction. The glass tube 50 is formed with a bulging portion 50A for forming a light emitting space at a substantially central portion and a flange portion 50B on one side of the sealing tube portion by heat processing with a burner. The bulging portion 50A has a central portion having the same diameter portion that is different from a spherical shape (spheroid shape) and has a substantially cylindrical shape with a constant outer surface diameter. Such a bulging portion 50 </ b> A can be manufactured by appropriately forming the shape of the forming roller at the time of heat processing in the glass tube 50.
(2) The cathode side electrode mount M1 and the anode side electrode mount M2 are inserted into the glass tube 50. Then, the glass tubes 50 around the metal foils 15a, 15b of the mounts M1, M2 are sealed by burner heating to form rod-shaped sealing tube portions 13a, 13b. FIG. 4B shows this state. At this stage, a predetermined gas, halide, and mercury are sealed in the glass tube 50.
(3) As shown in FIG. 3C, the spacer N is fitted into the straight sealing tube portion 13b where the flange portion 50B is not formed, and the glass tube 60 for the outer tube is attached. The outer tube glass tube 60 is a straight tube having a circular cross section, and the axis of the arc tube glass tube 50 and the axis of the outer tube glass tube 60 are regulated so as not to coincide with each other. If necessary, a part of the inner peripheral surface of the outer tube glass tube 60 is prepared so as to contact the maximum outer diameter portion (corresponding to the same diameter portion in this example) of the arc tube portion 12 in the arc tube 11. In this restricted state, the end portion 60A of the outer tube glass tube 60 and the flange portion 50B are brought into contact with each other to be heated and welded.
(4) After that, an unnecessary glass tube end region is excised. This is shown in FIG. Thus, the short arc lamp 10 in which the outer tube 17 and the arc tube 11 are integrally formed is completed.

(E) and (f) are views showing a state in which the base 18 is attached to the short arc lamp 10, (e) is a cross section in the tube axis direction, and (f) is an AA in the drawing of (e). It is a figure which shows a cross section. The base 18 is made of a metal having excellent heat resistance and corrosion resistance, such as stainless steel. The base 18 preferably has an inner diameter that fits the outer diameter of the outer tube 17 and fits without gaps. After the base 18 is attached to the end 17B of the outer tube 17, the periphery of the opening of the base 18 is silicon-based. The adhesive S is applied over the entire circumference, so that the internal short arc lamp 10 is kept liquid-tight.
As mentioned above, although an example was demonstrated about the manufacturing method of the short arc lamp which concerns on this invention, it cannot be overemphasized that the manufacturing method of a lamp | ramp is not limited to this content, and can be changed suitably.

<Second Embodiment>
Subsequently, another embodiment according to the present invention will be described. FIG. 4 is a cross-sectional view illustrating the outline of the configuration of another example of the light source device of the present invention. In the description of the first embodiment, the same components as those described with reference to FIGS. The light source device according to this embodiment is basically the same as the first embodiment in the configuration of the lamp body, the concave reflector, and the front glass in the short arc lamp, but in this example, the outer tube is a short arc lamp. The difference is that it is configured separately.

  As shown in the figure, a straight tubular outer tube 17 is arranged in parallel with the rotation axis of the reflecting surface in the condensing part 21 of the concave reflecting mirror 20, and one end 17 B on the rear side is arranged on the concave reflecting mirror 20. In a state where it is inserted into the cylindrical neck portion 23, it is liquid-tightly adhered by a sealing material S such as an adhesive. On the other hand, the other end 17A on the front side is inserted and carried in an opening 40A formed in the substantially central portion of the front glass 40, and is also liquid-tightly fixed by an adhesive S '.

  The short arc lamp 10 (lamp main body portion) is disposed in the condensing portion 21 of the concave reflecting mirror 20 with the outer peripheral surface of the arc tube portion 12 forming a contact portion K with the inner peripheral surface of the outer tube 17. The position where the contact portion K is formed is a portion corresponding to the upper portion in the vertical direction when the shaft of the short arc lamp 10 is supported in the horizontal direction, that is, most heated in the arc tube portion 12 during lamp lighting. It is a part to be done. In this example as well, the arc tube portion 12 is configured to have the same diameter portion (flat portion on the paper surface). Thus, when the same diameter part is formed, since the contact part K with respect to the outer peripheral surface of the outer tube 17 can be formed in a wide range, a larger cooling effect can be obtained.

  The concave reflecting mirror 20 has through holes 25 and 26 formed in the upper and lower portions on the paper surface, and the sheath tubes 27 and 28 are connected to form cooling water inlets or outlets, respectively.

  The light source device according to this embodiment also includes a cooling water circulation system as shown in FIG. For example, cooling water is introduced into a substantially sealed space formed by the concave reflecting mirror, the front plate, and the outer tube from the sheath tube 27 disposed at the upper portion, and flows in the space sandwiched between the light collecting portion and the outer tube 17. Then, it is discharged from the sheath tube 28 arranged at the lower part. Then, the outer tube 17 is directly cooled by the cooling water, and the arc tube 11, particularly the arc tube portion 12, is effectively cooled.

The arc tube 11 has a high temperature at the upper portion of the arc tube portion 12 due to the influence of convection. , Devitrification and breakage can be suppressed.
As a result, it is possible to maintain a stable lighting state of the lamp, to suppress a reduction in resistance due to exposure of the arc tube to a high temperature, and to realize a high input of the lamp.

<Third Embodiment>
Still another embodiment according to the present invention will be described. FIG. 5 is a cross-sectional view taken along the lamp tube axis for explaining the third embodiment. In the description of the first and second embodiments, the same components as those described with reference to FIGS.
The concave reflecting mirror 30 according to this embodiment is different from that of the above-described embodiment in that the base body 30a is made of metal. The base body 30a is manufactured by, for example, aluminum die casting (extrusion molding), and the surface of the light collecting portion 31 has a metal reflecting surface 31A formed by polishing. Of course, the reflecting surface 31A can be formed by a method other than polishing. For example, a method in which a glass layer is formed on the surface of the light condensing part 31 and a dielectric multilayer film is formed on the glass layer is used. Is also possible.

  Through holes 35 and 36 are formed at the upper and lower opposing portions of the light collecting portion 31, and the sheath pipes 37 and 38 are connected to each other to constitute a cooling water introduction port and a discharge port. In addition, an opening serving as a neck portion 33 is formed at the rear end portion of the concave reflecting mirror 30, and instead of a cylindrical portion (tubular neck portion) extending rearward from the neck portion, a substantially cylindrical insulating property is provided. The reflex base 39 is connected by a sealing material S such as an adhesive, and the base 18 of the short arc lamp 10 is inserted into the opening 36A on the bottom surface of the reflex base 39 and fixed and held by the sealing material S. That is, the short arc lamp 10 is fixed to the concave reflecting mirror 30 through the base 18 and the reflex base 39.

  A front glass 40 is attached to the front opening edge 32 </ b> A of the concave reflecting mirror 30.

Similar to the first embodiment, the short arc lamp 10 includes an outer tube 17 that is transparent to light, and an end portion 17A positioned at the front is an outer peripheral surface of the sealing tube portion 13a in the short arc lamp 10. The short arc lamp 10 is held in a state supported by the outer tube 17. The short arc lamp 10 is the same as that according to the first embodiment described above, that is, the outer tube 17 is welded to the short arc lamp 10 and is integrally formed.
Although detailed description is omitted here, an upper portion of the arc tube portion 12 in the arc tube 11 is circumscribed on the inner peripheral surface of the outer tube 17, and the arc tube portion 12 in the arc tube 11 has the same diameter portion. In the same-diameter region, the contact area is obtained by circumscribing the outer tube. One sealing tube portion 13 b and the outer tube end portion 17 B are inserted into an opening 36 A provided in the neck portion 33 and the reflex base 39 of the concave reflecting mirror 30, and are liquid-tightly fixed by the adhesive S. The reflex base 39 is an insulating member and is made of ceramics such as quartz glass and alumina. This is to maintain insulation between the concave reflecting mirror 30 and the short arc lamp 10.

  The concave reflecting mirror according to this embodiment has a base made of metal. Therefore, the lead wire W1 is accommodated in the insulating tube 34A so that the voltage applied to the electrodes E1 and E2 does not pass through the concave reflecting mirror 30, and a lead wire lead-out hole formed in a part of the front opening edge 32A. 34. The material of the insulating tube 34A is preferably a ceramic such as quartz glass or alumina, and its opening is closed by the adhesive S, and the lead wire W1 is led out in a liquid-tight manner.

  The light source device according to this embodiment is also provided with a cooling water circulation system similar to that shown in FIG. For example, cooling water is introduced into the space formed by the concave reflecting mirror 30, the front plate 40 and the outer tube 17 through the sheath tube 37 inside the concave reflecting mirror 30, and the cooling water is inside the concave reflecting mirror 30. And then discharged from the sheath tube 38 serving as a discharge port. Thus, the concave reflecting mirror 30 and the outer tube 17 are directly cooled by circulating through the predetermined flow path, and the short arc lamp 10 is cooled. Although the arc tube 11 is indirectly cooled via the outer tube 17, the upper portion of the arc tube portion 12 becomes hot due to the influence of convection, but the outer peripheral surface of the outer tube 17 at the contact portion K in the upper portion of the arc tube portion 12. Since this is in contact with the surface, the portion can be reliably and effectively cooled.

  In the present embodiment, since the base of the concave reflecting mirror is made of metal, the heat conduction is good, the heat dissipation effect to the outside is excellent, and the cooling effect of the lamp is remarkably improved.

<Fourth Embodiment>
Next, FIG. 6 is a cross-sectional view taken along a lamp tube axis for explaining still another embodiment of the present invention. In the present embodiment, only the flow path of the cooling water is different, and the other configuration is the same as that of the third embodiment. About this embodiment, about the structure demonstrated previously in FIGS. 1-5, it shows with the same code | symbol and abbreviate | omits detailed description.
A cylindrical reflector base 39 made of an insulating material is connected to the concave reflecting mirror 30 made of the metal base 30a so as to cover the neck 33 formed at the rear end thereof. A through hole 39A is formed on the side surface of the reflex base in the upper part in the vertical direction, and a sheath pipe 39B for supplying cooling water is connected. On the other hand, the concave reflecting mirror 30 is also formed with an opening at a position in the upper vertical direction of the front opening edge portion 32A and connected to the sheath tube 38, thereby forming a cooling water discharge port.

  When cooling water is introduced from a cooling water circulation system (not shown) into the space formed by the concave reflector 30, the front plate 40, and the outer tube 17, it is arranged around the sealing tube portion 13b of the short arc lamp 10. It flows around the outer tube 17, moves to the inner space of the condensing part 31 of the concave reflecting mirror 30, and is discharged through the sheath tube 38.

  According to such a configuration, due to the configuration of the concave reflecting mirror 30, the outer tube 17 around the sealing tube portion 13b that easily traps heat in order to form a narrow portion is effectively cooled, and the sealing tube portion 13b. It is possible to reliably prevent oxidation of the metal foil 15b and the like embedded in the metal. Moreover, since the outer tube 17 is connected to the sealing tube portion 13a of the short arc lamp 10 and the upper portion of the arc tube portion 12 forms the contact portion K with the outer tube 17, these portions are reliably cooled. Is done.

  According to the present invention described above, the cooling water is circulated inside the concave reflecting mirror, and the arc tube is cooled directly and indirectly via the outer tube. Therefore, it is ensured even at a part where the operating temperature of the arc tube is extremely high. Can be cooled to. In addition, the temperature can be controlled by using the cooling water, and an optimum cooling state can be formed according to the lighting state of the lamp.

  In addition, this invention is not limited to said example, A change can be added suitably. Moreover, any of a direct current lighting system and an alternating current lighting system can be applied as a lamp structure.

It is sectional drawing for description which cut | disconnected the light source device main body concerning the 1st Embodiment of this invention along the tube axis | shaft. It is the figure which showed typically the circulation system of the cooling water which concerns on the light source device of this invention. It is a figure explaining the manufacturing method of the short arc lamp with an outer tube | pipe concerning the light source device of this invention. It is sectional drawing for description of the light source device concerning other embodiment of this invention. It is sectional drawing for description of the light source device concerning other embodiment of this invention. It is sectional drawing for description of the light source device concerning other embodiment of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Short arc lamp 11 Arc tube 12 Arc tube part 13a, 13b Sealing tube part 14b Coil 15a, 15b Metal foil 16a, 16b External lead rod 17 Outer pipe 17A, 17B End part 18 Outer pipe | tube E1, E2 Electrode W1 Lead Line S, S ′ Sealing material K Contact part M1, M2 Mount N Spacer 20 Concave reflector 20a Base 21 Condensing part 21b Condensing part rear end 21A Reflecting layer 22 Light projection port 22A Front opening edge 23 Cylindrical neck part 24 Lead Line outlet holes 25, 26 Through holes 27, 28 Sheath tube 30 Concave reflector 30a Base 31 Condensing part 31A Reflecting surface 32 Light projection port 32A Front opening edge 33 Neck 34 Lead wire outlet hole 34A Insulating pipes 35, 36 Through hole 36A Opening 36B Through-holes 37, 38 Sheath tube 39 Ref base 39A Opening 39B Sheath tube 40 Front glass (front plate)
40A opening 45 cooling means 46 pump 50 glass tube 50A bulging portion 50B flange portion 60 outer tube 60A, B end

Claims (5)

A light emitting tube having a light emitting tube portion forming a light emitting space therein and a sealing tube portion continuously provided at both ends of the light emitting tube portion, a pair of electrodes disposed opposite to each other inside the light emitting tube portion, and the light emitting device A short arc lamp provided with mercury enclosed in the tube part;
A translucent outer tube,
A concave reflector having a light projection port for emitting radiation light from the short arc lamp at its front end and a neck at its rear end;
A front plate having translucency covering the light projection port;
Cooling fluid supply means,
An outer tube is disposed inside the concave reflecting mirror, with the short arc lamp being accommodated therein,
A light source device characterized in that a substantially sealed space is formed by a concave reflecting mirror, a front plate, and an outer tube, and a cooling fluid flows through the space.
The light source device according to claim 1, wherein one end portion of the outer tube is welded to a sealing tube portion of the short arc lamp.
A light emitting tube having a light emitting tube portion forming a light emitting space therein and a sealing tube portion continuously provided at both ends of the light emitting tube portion, a pair of electrodes disposed opposite to each other inside the light emitting tube portion, and the light emitting device A short arc lamp provided with mercury enclosed in the tube part;
A translucent outer tube,
A concave reflector having a light projection port for emitting radiation light from the short arc lamp at its front end and a neck at its rear end;
A front plate having translucency covering the light projection port;
Cooling fluid supply means,
The outer tube inside the concave reflecting mirror, one end and the other end of the outer tube are fixed and held by the front plate and the concave reflecting mirror, respectively.
The short arc lamp is disposed inside the outer tube,
A light source device characterized in that a substantially sealed space is formed by a concave reflecting mirror, a front plate, and an outer tube, and a cooling fluid flows through the space.
4. The light source device according to claim 1, wherein a part of the arc tube portion of the short arc lamp is in contact with the outer tube.
4. The light source device according to claim 1, wherein the concave reflecting mirror has a base made of metal, and a cooling fluid made of ion-exchanged water.

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