JP2007066742A - Light source device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To improve starting property of an extra-high pressure mercury lamp, and provide a light source device in which problems of conventional technology have been solved. <P>SOLUTION: In the light source device which is consisting of the extra-high pressure mercury lamp 1 in which a pair of electrodes are opposedly arranged in a light-emitting tube, and in which 0.15 mg/mm<SP>3</SP>or more of mercury is enclosed, and of a reflecting mirror 2 which surrounds the extra-high pressure mercury lamp 1 and which reflects the light irradiated from the extra-high pressure mercury lamp 1 toward the irradiated region, and a high voltage electric power supply electric wire 4 to supply a high voltage to the extra-high pressure mercury lamp 1 is inserted and penetrated through a through hole 11 formed at the reflecting mirror 2, and connected to the high voltage electric power supply terminal 9, and in which the high voltage electric power supply terminal 9 is fixed to the reflecting mirror 2 by a fixing means, a starting auxiliary light source 6 is fixed to the reflecting mirror 2 by the fixing means. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a light source device, and more particularly to a light source device with improved startability of a high-intensity discharge lamp (HID lamp) such as a high-pressure mercury discharge lamp used as a light source for a projector.

Usually, a light source device used in an optical apparatus such as a liquid crystal projector or a DLP projector condenses light emitted from a high-intensity discharge lamp such as a high-pressure mercury discharge lamp serving as a light source and the high-intensity discharge lamp, A reflecting mirror that reflects toward the front opening is integrally combined.
In order to light such a discharge lamp, in general, a pulsed high voltage is applied between the main discharge electrodes of the high-intensity discharge lamp or between the main discharge electrode and the outer surface of the discharge vessel at the time of starting. Dielectric breakdown is caused in the discharge medium in the vessel, and glow discharge or arc discharge is induced using the plasma electrons generated at this time as seeds.
The voltage required for dielectric breakdown at the start of such a discharge lamp is generally about several kV when the discharge lamp is in a temperature state of about room temperature. However, the voltage required for dielectric breakdown at the time of restart changes depending on the temperature of the discharge space that changes with the elapsed time after the light is turned on and turned off. This change occurs because as the temperature of the discharge space decreases and the temperature of the discharge space decreases, a part of the vaporized discharge medium such as mercury or halogen starts to condense, resulting in a change in the composition of the gas components in the discharge space. This is probably because the voltage required for dielectric breakdown changes.
For example, in the case of a discharge lamp that uses mercury, a halogen such as bromine, and a rare gas such as argon as the discharge medium and contains 0.15 mg or more of mercury per 1 mm ³ of the volume of the discharge space, the voltage required for dielectric breakdown is Immediately after the light is extinguished, it is very low due to the presence of residual plasma, but then rises rapidly and then begins to decline (approximately 2 minutes are required under natural cooling where the discharge lamp is not forcedly cooled). However, re-lighting from that time until the temperature of the discharge space finally drops to about 100 ° C. or less (about 5 minutes after turning off the light) does not stabilize the dielectric breakdown voltage, and only applied a normal high voltage. Then there may be no breakdown.
In order to restart (hot restart) from the earliest possible time after the light is turned off, and to increase the probability of lighting, simply increasing the absolute value of the applied voltage. However, in such a case, an unintended phenomenon occurs when a high voltage is applied. In other words, various inconvenient phenomena may occur, such as dielectric breakdown of the insulation cable sheath, occurrence of dangerous phenomena such as creeping discharge in connectors and connection terminals, malfunction of the electronic circuit of the projector device body due to noise during high voltage application, etc. There is sex. In addition, in order to avoid such an inconvenient phenomenon, if the space distance is increased in order to improve the insulation property, or the cable diameter is increased in order to prevent noise, the required space for incorporation into the projector apparatus is increased. Is necessary and is not preferable.

In order to solve such a problem, according to Japanese Patent No. 3528836, an auxiliary discharge vessel configured non-integrally with the main discharge vessel is brought close to at least one side surface of the electrode sealing portion of the main discharge vessel. Thus, the auxiliary discharge vessel is discharged to improve the starting characteristics. However, the technique described in this publication has the following problems.
That is, in recent years, there has been a strong demand for downsizing and weight reduction of the liquid crystal projector device, and accordingly, further downsizing of the light source device is desired, and parts such as the auxiliary discharge vessel are required to be further reduced. However, further miniaturization of the auxiliary discharge vessel is difficult in production, which causes a reduction in quality and an increase in cost.
Furthermore, when the auxiliary discharge vessel is disposed in close contact with the main discharge vessel, the auxiliary discharge vessel is likely to receive heat from the main discharge vessel, so that the gas pressure in the auxiliary discharge vessel is increased. As a result, the dielectric breakdown voltage of the auxiliary discharge vessel rises, making it difficult to start discharge in the auxiliary discharge vessel, and the startability of the discharge lamp is deteriorated.

In order to solve the problems of the technique disclosed in the above publication, the present applicant has proposed a light source device as disclosed in Japanese Patent Application Laid-Open Nos. 2004-139955 and 2005-19040. According to the techniques described in these publications, the starting auxiliary light source is configured to be non-integral with the discharge lamp, and the starting auxiliary light source is held by the reflecting mirror or a member adjacent to the reflecting mirror, or the reflecting mirror itself is provided. The above-mentioned problem is solved by forming a bubble portion that becomes a discharge space of the auxiliary start light source.
Japanese Patent No. 3528836 JP 2004-139955 A JP-A-2005-19040

  However, according to the techniques disclosed in the above-mentioned publications, when the starting auxiliary light source is attached to the reflecting mirror, the lead wire is connected to the electrode of the starting auxiliary light source, so that the lead wire is complicated. On the other hand, if the lead wire is to be connected after the start-up auxiliary light source is attached to the reflecting mirror, the start-up auxiliary light source is very small, which makes it difficult to connect the lead wires. Further, (b) when the light source device is transported, if a vibration or impact is applied to the light source device, there arises a problem that the starting auxiliary light source falls off the reflecting mirror or a member adjacent to the reflecting mirror. Furthermore, (c) creating a space for installing the auxiliary start light source in the reflecting mirror or forming a bubble portion in the reflecting mirror itself as a discharge space for the auxiliary start light source is difficult in manufacturing and The problem which becomes the thing which lacks the reliability with respect to bursting pressure | voltage resistant arises.

  In view of the above problems, an object of the present invention is to provide a light source device that improves the startability of an ultra-high pressure mercury lamp and solves the problems of the prior art shown in the above (a) to (c). It is in.

The present invention employs the following means in order to solve the above problems.
The first means includes a super high pressure mercury lamp in which a pair of electrodes are disposed opposite to each other in an arc tube and 0.15 mg / mm ³ or more of mercury is enclosed, and the super high pressure mercury lamp surrounds the super high pressure mercury lamp. A high-voltage power supply line for supplying a high voltage to the ultra-high pressure mercury lamp through a through-hole formed in the reflective mirror. In the light source device which is connected to the power supply terminal and fixes the high voltage power supply terminal to the reflecting mirror by a fixing means, a starting auxiliary light source is fixed to the reflecting mirror by the fixing means.
The second means is the light source device according to the first means, wherein the fixing means fixes a conductive holder for holding the auxiliary start light source to the reflecting mirror.
A third means is the first means or the second means, wherein the ultra high pressure mercury lamp is stretched in the longitudinal direction along the outer surface thereof, and a trigger wire having the same potential as the high voltage feeder is provided. It is provided with the light source device characterized by the above-mentioned.
The fourth means includes a trigger wire in which a pair of electrodes are arranged opposite to each other in the arc tube, 0.15 mg / mm ³ or more of mercury is enclosed, and is stretched in the longitudinal direction along the outer surface of the arc tube. An ultra high pressure mercury lamp and a reflecting mirror that surrounds the ultra high pressure mercury lamp and reflects light emitted from the ultra high pressure mercury lamp toward the radiation area, and supplies a high voltage to the trigger wire. In the light source device, the electric wire is inserted into the through hole formed in the reflecting mirror and connected to the high voltage power supply terminal, and the high voltage power supply terminal is fixed to the reflector by the fixing means. The light source device is characterized in that a conductive holder for holding is fixed to the reflecting mirror.
According to a fifth means, in any one of the first to fourth means, the starting auxiliary light source is disposed in a virtual reflected light beam of light from the ultrahigh pressure mercury lamp to the through hole. A light source device.
According to a sixth means, in any one of the first to fourth means, the reflecting mirror is an elliptical reflecting mirror, and the starting auxiliary light source is outside the light beam collected by the reflecting mirror. It is a light source device characterized by being arranged in the area.
A seventh means is characterized in that, in any one of the first means to the sixth means, the conductive holder includes means for reflecting the ultraviolet light emitted from the auxiliary start light source. A light source device.

According to the first aspect of the present invention, since the starting auxiliary light source can be easily attached to the elliptical reflecting mirror by the fixing means, a feeding line for supplying a high voltage to the starting auxiliary light source is not required at all. As in the light source device, there is no problem that it becomes difficult to attach the start auxiliary light source when the power supply line is connected to the start auxiliary light source, and the workability is dramatically improved. In addition, since the start-up auxiliary light source is fixed to the reflecting mirror, there is no fear that the start-up auxiliary light source will fall even when vibration or impact is applied to the light source device during transportation of the light source device. In addition, unlike the prior art, it is not necessary to create a space for installing a starter auxiliary light source in the reflecting mirror, or to provide an auxiliary discharge space that forms bubbles in the reflecting mirror itself and emits ultraviolet rays. Will not drop. In addition, fixing the auxiliary start light source to the reflecting mirror can be done by using the fixing means that was originally used to fix the high voltage power supply terminal for connecting the high voltage power supply line to the elliptical reflecting mirror. There is no need to provide a separate member for fixing the light source.
According to the second aspect of the present invention, the starting auxiliary light source can be easily attached to the reflecting mirror by a very simple operation of attaching the conductive holder for holding the starting auxiliary light source to the reflecting mirror by the fixing means.
According to the third aspect of the present invention, the breakdown voltage between the electrodes of the ultra-high pressure mercury lamp can be lowered by the synergistic effect of the action by the auxiliary start light source and the action by the trigger wire, and the main discharge is easily generated. The startability of the ultra high pressure mercury lamp can be improved.
According to the fourth aspect of the present invention, since the conductive holder for holding the starting auxiliary light source by the fixing means can be easily attached to the elliptical reflecting mirror, the starting auxiliary light source supplies the power supply line for supplying a high voltage. This eliminates the problem that it becomes difficult to attach the start auxiliary light source when the power supply line is connected to the start auxiliary light source as in the conventional light source device, and the workability is dramatically improved. To improve. In addition, since the start-up auxiliary light source is fixed to the reflecting mirror, there is no fear that the start-up auxiliary light source will fall even when vibration or impact is applied to the light source device during transportation of the light source device. In addition, unlike the prior art, it is not necessary to create a space for installing the start-up auxiliary light source in the reflecting mirror, or to provide an auxiliary discharge space that forms bubbles in the reflecting mirror itself and emits ultraviolet rays. Will not drop. In addition, fixing the auxiliary starting light source to the reflecting mirror can be done by using the fixing means used to fix the high voltage feeding terminal for connecting the high voltage feeding line to the elliptical reflecting mirror. There is no need to provide a separate member for fixing the light source. Furthermore, the synergistic effect of the action of the auxiliary start light source and the action of the trigger wire can reduce the dielectric breakdown voltage between the electrodes of the ultra high pressure mercury lamp, and can easily generate the main discharge. The startability of the can be improved.
According to the fifth aspect of the present invention, the starting auxiliary light source is disposed in a virtual reflected light beam in which light emitted from the ultrahigh pressure mercury lamp is reflected by a portion corresponding to the through hole of the reflecting mirror, and is fixed. Since the place where the means is provided is a place where the light from the ultrahigh pressure mercury lamp is not reflected, the loss of the reflected light can be minimized.
According to the sixth aspect of the present invention, since the start auxiliary light source is disposed in the region outside the light beam collected by the reflecting mirror, loss of reflected light can be avoided.
According to the seventh aspect of the present invention, by providing the starting auxiliary light source with means for reflecting the ultraviolet light emitted from the starting auxiliary light source, the starting auxiliary light source emits the light toward the light emission space of the ultrahigh pressure mercury lamp. Since the amount of ultraviolet light can be increased, the startability of the ultra-high pressure mercury lamp can be further improved.

A first embodiment of the present invention will be described with reference to FIGS.
1 is a diagram showing a configuration of a light source device according to the invention of the present embodiment, FIG. 2 is an enlarged cross-sectional view of the ultrahigh pressure mercury lamp shown in FIG. 1, and FIG. 3 is an enlarged cross-sectional view of a starting auxiliary light source shown in FIG. 4A and 4B are enlarged cross-sectional views showing fixing means for fixing the auxiliary start light source and the high-voltage power supply terminal in the through hole of the elliptical reflector shown in FIG.
In these drawings, 1 is an ultrahigh pressure mercury lamp, 101 and 102 are the anode and cathode of the ultrahigh pressure mercury lamp 1, 103 is a coil wound around the cathode 102, 104 is a sealing portion, 105 is a metal foil, 106 Is an external lead, 107 is a discharge space, 108 is a light emitting section, 2 is an elliptical reflecting mirror, 3 is a base member, 4 is connected to an external lead 106 on the cathode 102 side of the ultra high voltage mercury lamp 1, and the other end is A high voltage power supply line 5 connected to a high voltage power supply line 5 at a high voltage power supply terminal 9 is connected to a power supply device (not shown) to supply a high voltage, and 6 is a discharge of the ultra high pressure mercury lamp 1. A start auxiliary light source that emits ultraviolet rays toward the space, 61 and 62 are external electrodes provided on the start auxiliary light source 6, 63 is an auxiliary discharge vessel of the start auxiliary light source 6, and 7 is a holding and fixing start auxiliary light source 6. By means A conductive holder fixed in the through-hole 11 of the ultra-high pressure mercury lamp 1, 8 is an eyelet member, 9 is inserted into the cylindrical portion and crimped by inserting the high-voltage feeder 4 and the high-voltage feeder 5. A high voltage power supply terminal that is electrically connected and fixed to the through-hole 11 of the elliptical reflecting mirror 2 by a fixing means, 10 is an internal tooth washer, and 11 is a through-hole provided in the elliptical reflecting mirror 2.

  As shown in FIG. 1, the light source device includes an ultrahigh pressure mercury lamp 1, an elliptical reflecting mirror 2 surrounding the ultrahigh pressure mercury lamp 1, a base member 3 fixed to the neck of the elliptical reflecting mirror 2, and a fixing means. A conductive holder 7 fixed to the through-hole 11 of the elliptical reflecting mirror 2 and a starting auxiliary light source 6 held by the conductive holder 7 are provided. Further, the start auxiliary light source 6 is disposed in a virtual reflected light beam in which light emitted from the ultrahigh pressure mercury lamp 1 is reflected by a portion corresponding to the through hole 11 of the elliptical reflecting mirror 2. Since the place where the fixing means is provided is a place where the light from the extra-high pressure mercury lamp 1 is not reflected, the loss of reflected light can be minimized by arranging the auxiliary start light source 6 as described above. it can.

As shown in FIG. 2, the ultrahigh pressure mercury lamp 1 includes a light emitting unit 108 and a sealing unit 104 extending at both ends of the light emitting unit 108. A pair of electrodes 101, 102 (anode and cathode in the case of a direct current lighting system) made of tungsten are disposed in the light emitting unit 108, and mercury as a light emitting substance is 0.15 mg / mm ³ or more. For example, in order to prevent tungsten, which is a constituent material of the electrode from adhering to the inner wall of the arc tube due to the halogen cycle, in addition to being enclosed in 0.2 mg / mm ³ , halogen gas such as bromine is 2.0 × 10 ^{− The range is 4} μmol / mm ^{3 to} 7.0 × 10 ⁻³ μmol / mm ^3. For example, 3.0 × 10 ⁻⁴ μmol / mm ^{3 is} enclosed, and about 13 kPa of argon gas is further enclosed. The sealing portion 104 is sealed with a metal foil 105 made of morifden. One end of the metal foil 105 is electrically connected to the base end portion of the electrodes 101 and 102 extending toward the light emitting space 107, and the other end of the metal foil 105 is connected from the sealing portion 104 to the outside of the sealing portion. The proximal end portion of the projecting external lead 106 is electrically connected.
In such an ultra-high pressure mercury lamp 1, the maximum outer diameter of the light emitting portion 108 is 11.3 mm, the distance between the electrodes is 1.2 mm, the inner volume of the light emitting portion 108 is 116 mm ³ , and the tube wall load is 1.5 W / mm ^3. The rated voltage is 80V and the rated power is 200W.
The elliptical reflecting mirror 2 has an elliptical reflecting surface provided with a dielectric multilayer film for reflecting a visible ray toward the front of the light emitted from the ultra-high pressure mercury lamp 1, and the first focal point thereof is The ultra-high pressure mercury lamp 1 is fixed so as to coincide with the location where the bright spot of the ultra-high pressure mercury lamp 1 is to be formed. Specifically, one sealing portion 104 of the ultrahigh pressure mercury lamp 1 is inserted into the base member 3, and the base member 3 and the sealing portion 104 are bonded and fixed by a ceramic adhesive. In the through hole 11 provided in the elliptical reflecting mirror 2, a conductive holder 7 for holding the auxiliary start light source 6 is fixed by a fixing means described later.

As shown in FIG. 3, the starting auxiliary light source 6 includes an auxiliary discharge vessel 63 made of quartz glass, and external electrodes 61 and 62 disposed on the outer surfaces of both ends of the auxiliary discharge vessel 63, The auxiliary discharge vessel 63 is filled with one or more types of gases such as nitrogen or helium in addition to rare gases such as argon, xenon, and neon as discharge gases. Furthermore, a trace amount of mercury may be enclosed in order to obtain a penning effect.
The external electrodes 61 and 62 are formed by winding a wire rod made of stainless steel and cantal (iron-chromium alloy) excellent in heat resistance and thermal shock resistance in the longitudinal direction of the auxiliary discharge vessel 63. Note that a wire previously formed in a coil shape may be attached to the auxiliary discharge vessel 63 as the external electrodes 61 and 62.
The auxiliary discharge vessel 63 has, for example, a total length of about 15 mm, an outer diameter of about 3 mm, and a wall thickness of about 0.8 mm. The external electrodes 61 and 62 are, for example, formed into a coil shape having a total length (longitudinal direction of the auxiliary discharge vessel 63) of about 4 mm and an outer diameter of about 3 mm using a wire of φ0.3 mm, and the distance between the external electrodes is about 6 mm. is there. In the auxiliary discharge vessel 63, for example, argon gas is sealed at about 10 ^{2 to} 5 × 10 ⁵ pa, and mercury is sealed at 5 × 10 ⁻³ mg / mm ³ .
The starting auxiliary light source 6 is fitted into a cylindrical portion provided in the conductive holder 7 so as to cover the periphery of the end portion on the side where the one external electrode 61 of the auxiliary discharge vessel 63 is provided. Yes. The conductive holder 7 (external electrode 61) also functions as an external electrode of the auxiliary start light source 6, and the other external electrode 62 of the auxiliary start light source 6 is in an electrically floating state.

  Further, as shown in FIGS. 4A and 4B, the conductive holder 7 and the high-voltage power supply terminal 9 are attached to the through-hole 11 of the elliptical reflecting mirror 2 by a fixing means. That is, the fixing means is composed of a cylindrical eyelet member 8 and an internal tooth washer 10, and the cylindrical eyelet member 8 includes the conductive holder 7, the through-hole 11 of the elliptical reflector 2, the high-voltage power supply terminal 9, and the like. After being inserted into the internal tooth washer 10, the protruding tip is bent so as to expand, so that these members are fixed integrally. Further, the high voltage power supply line 4 connected to the external lead 106 on the cathode 102 side and the high voltage power supply line 5 connected to a power supply device (not shown) are caulked in the cylindrical portion of the high voltage power supply terminal 9. Are electrically connected.

  When such an ultrahigh pressure mercury lamp 1 is started, when a high voltage (−14 kV) is applied to the cathode 102 of the ultrahigh pressure mercury lamp 1 and the conductive holder 7 holding the auxiliary start light source 6, the anode Since 101 is at the ground potential (0 V), a high voltage is applied between the cathode 102 and the anode 101, and a dielectric barrier discharge is generated in the discharge space in the auxiliary discharge vessel 63 of the start auxiliary light source 6, thereby starting Light including ultraviolet rays is emitted from the auxiliary light source 6. When the ultraviolet light radiated from the auxiliary start light source 6 reaches the discharge space of the ultrahigh pressure mercury lamp 1, gas molecules such as mercury, which is a luminescent material, are photoionized, so that a large number of initial electrons exist in the light emitting unit 108. Therefore, the dielectric breakdown voltage is reduced, and the ultrahigh pressure mercury lamp 1 can be reliably turned on.

  According to the invention of the present embodiment, the starting auxiliary light source 6 does not require any power supply line for supplying a high voltage, and the cylinder provided in the conductive holder 7 fixed to the elliptical reflecting mirror 2 by the fixing means. The starting auxiliary light source 6 can be easily attached to the elliptical reflecting mirror 2 by an extremely simple operation of inserting one end of the auxiliary discharge vessel 63 into the shape portion. Therefore, unlike the conventional light source device, there is no problem that it becomes difficult to attach the start auxiliary light source when the power supply line is connected to the start auxiliary light source, and the workability is greatly improved. . In addition, since the start auxiliary light source 6 is firmly fixed by being fitted into the cylindrical portion of the conductive holder 7, even when vibration or impact is applied to the light source device when transporting the light source device, There is no worry that the starting auxiliary light source 6 falls. In addition, unlike the prior art, it is not necessary to create a space for installing a starter auxiliary light source in the reflecting mirror, or to provide an auxiliary discharge space that forms bubbles in the reflecting mirror itself and emits ultraviolet rays. Will not drop.

Further, according to the invention of the present embodiment, the fixing of the conductive holder 7 to the through hole 11 of the elliptical reflecting mirror 2 is originally performed by connecting the high voltage power supply line 4 and the high voltage power supply line 5 to the high voltage power supply terminal. Since it is sufficient to use the fixing means used to fix 9 to the through-hole 11 of the elliptical reflecting mirror 2, there is no need to provide a separate member for fixing the conductive holder 7, which is advantageous in terms of cost. It is.
Here, although the external electrode 62 provided on the outer surface of the auxiliary discharge vessel 63 on the side where the conductive holder 7 is not fixed is in an electrically floating state, the dielectric material is used in the starting auxiliary light source 6. The reason why the barrier discharge occurs is as follows. That is, since the other external electrode 62 is in an electrically floating state, when viewed from a high voltage, it is at a pseudo ground potential, and the applied high voltage is a high-frequency pulse wave. This is because a high voltage is induced capacitively in the internal discharge space between 61 and the other external electrode 62 via the quartz glass of the auxiliary discharge vessel 63 of the auxiliary start light source 6.

Next, a second embodiment of the present invention will be described with reference to FIGS. 2 to 4 and FIG.
FIG. 5 is a diagram showing the configuration of the light source device according to the invention of this embodiment.
In the figure, reference numeral 12 denotes a trigger wire which is stretched in the longitudinal direction along the outer surface of the ultrahigh pressure mercury lamp 1 in order to improve startability, and has the same potential as the high voltage feeder 4. Other configurations correspond to the configurations of the same reference numerals shown in FIG.
In the light source device of the present embodiment, the trigger wire 12 is made of, for example, iron chrome wire, and a winding portion is formed in the vicinity of the boundary portion between the light emitting portion 108 of the ultrahigh pressure mercury lamp 1 and the sealing portion 104 on the anode 101 side. It is stretched along the outer surface of the light emitting portion 108 and the sealing portion 104 on the cathode 102 side, wound around the external lead 106 on the cathode 102 side, and has the same potential as the cathode 102.

At the time of starting the light source device of the present embodiment, the anode 101 of the ultrahigh pressure mercury lamp 1 and the external electrode 62 provided on the auxiliary discharge vessel 63 of the starting auxiliary light source 6 are at ground potential, and the trigger wire 12 and the anode 101 are A high voltage (for example, −14 kV) is applied between them, and the internal discharge space is also interposed between the conductive holder 7 (external electrode 61) and the external electrode 62 via the quartz glass of the auxiliary discharge vessel 63. A high voltage (for example, −14 kV) is induced in capacitive coupling. As a result, a dielectric barrier discharge is generated in the discharge space of the auxiliary discharge vessel 63, and ultraviolet light is emitted from the auxiliary start light source 6 toward the discharge space in the light emitting portion 108 of the ultrahigh pressure mercury lamp 1, As the mercury present in the discharge space in the light emitting unit 108 is ionized, the dielectric breakdown voltage is lowered. Furthermore, when a high voltage is applied between the trigger wire 12 and the anode 101, a dielectric barrier discharge is generated, ionization of mercury in the light emitting unit 108 is promoted, and the dielectric breakdown voltage can be further reduced. it can.
That is, according to the invention of this embodiment, the dielectric breakdown voltage between the anode 101 and the cathode 102 of the ultrahigh pressure mercury lamp 1 can be reduced by the synergistic effect of the action of the auxiliary start light source 6 and the action of the trigger wire 12. The main discharge between the anode 101 and the cathode 102 can be easily generated, and the startability of the ultrahigh pressure mercury lamp can be improved.

Next, a third embodiment of the present invention will be described with reference to FIGS. 2 to 4 and FIG.
FIG. 6 is a diagram showing a configuration of the light source device according to the invention of the present embodiment.
In the figure, 13 is a first through hole provided in the elliptical reflecting mirror 2 and the conductive holder 7 and the high voltage power supply terminal 14 are fixed by a fixing means, and 14 is a trigger wire 15 and a high voltage power supply line. 16 is a high voltage power supply terminal electrically connected to 16, 15 is a trigger wire stretched in the longitudinal direction along the outer surface of the ultra high pressure mercury lamp 1, and 16 is a high voltage connected to a power supply device (not shown). The high-voltage power supply line 17 for supplying the power supply 17 is provided in the elliptical reflecting mirror 2, and a second feedthrough in which a power supply terminal (not shown) for electrically connecting the power supply line 18 and the power supply line 19 is fixed by a fixing means. A hole 18 is a power supply line for supplying power to the external lead 106 on the cathode 102 side of the ultra-high pressure mercury lamp 1, and 19 is a power supply line connected to a power supply device (not shown) to supply voltage. Other configurations correspond to the configurations of the same reference numerals shown in FIG.
As shown in the figure, in the first through-hole 13, the conductive holder 7 is fixed by the fixing means, and the trigger wire 15 and the high-voltage power supply line 16 are electrically connected to each other. The power supply terminal 14 is fixed. The second through hole 17 is also provided with a fixing means similar to the fixing means shown in FIG. 4, and a power supply terminal (not shown) in which the power supply line 18 and the power supply line 19 are electrically connected is fixed. ing. The trigger wire 15 is made of, for example, iron chrome wire, and one end of the trigger wire 15 is wound in the vicinity of the boundary between the light emitting portion 108 of the ultrahigh pressure mercury lamp 1 and the sealing portion 104 on the anode 101 side. Then, it is stretched along the light emitting portion 108 and wound around the sealing portion 104 on the cathode 102 side to form a cathode side winding portion, and the other end is high. The voltage supply terminal 14 is electrically connected to the high voltage supply line 16.

  At the time of starting the light source device of the present embodiment, the trigger wire 15 and the anode 101 are connected in a state where, for example, a no-load open voltage of about 300 V is applied between the anode 101 and the cathode 102 of the ultrahigh pressure mercury lamp 1. A high voltage (for example, −14 kV) is applied between the trigger wire 15 and the cathode 102, and at the same time, the conductive holder 7 (external electrode 61) and the external electrode 62 provided in the auxiliary discharge vessel 63. Also, a high voltage (for example, −14 kV) is induced capacitively in the internal discharge space through the quartz glass of the auxiliary discharge vessel 63. As a result, a dielectric barrier discharge is generated in the discharge space of the auxiliary discharge vessel 63, and ultraviolet light is emitted from the starting auxiliary light source 6 toward the discharge space in the light emitting unit 108 of the ultrahigh pressure mercury lamp 1. The breakdown voltage is lowered by ionizing mercury existing in the discharge space. Furthermore, since a dielectric barrier discharge is generated by applying a high voltage between the trigger wire 15 and the anode 101 and between the trigger wire 15 and the cathode 102, the ionization of mercury in the light emitting unit 108 is promoted. Thus, the dielectric breakdown voltage can be further reduced.

  The light source device according to the present embodiment further has the following advantages. That is, the light emitting part 108 and the sealing part 104 of the ultrahigh pressure mercury lamp inevitably have, for example, sodium ions at the stage of processing the quartz glass, which is a constituent material thereof, into a shape suitable for the ultrahigh pressure mercury lamp 1. When alkali metal ions are present between the sealing portion 104 and the metal foil 105, a problem arises that the sealing portion 104 is damaged due to the floating phenomenon of the foil. However, since a negative high voltage is applied to the cathode-side winding part, such alkali metal ions are attracted to the cathode-side winding part and drawn out of the light emitting part 108 and the sealing part 104. Therefore, the problem that the sealing portion 104 is damaged due to the foil floating phenomenon can be avoided.

Next, a fourth embodiment of the present invention will be described with reference to FIG.
FIG. 7 is a diagram showing the configuration of the light source device according to the invention of this embodiment.
The configuration shown in the figure corresponds to the configuration of the same symbol shown in FIG.
As shown in the figure, the starting auxiliary light source 6 is disposed in a region outside the light beam collected by the elliptical reflecting mirror 2. By disposing the auxiliary start light source 6 in this way, the loss of reflected light can be completely eliminated.

Next, a fifth embodiment of the present invention will be described with reference to FIG.
FIG. 8 is a diagram showing the configuration of the light source device according to the invention of this embodiment.
In the figure, reference numeral 20 denotes a parabolic reflector having a parabolic reflecting surface. Other configurations correspond to the same reference numerals shown in FIG.
As shown in the figure, when the parabolic reflector 20 is used as the reflector, the auxiliary start light source 6 is arranged so that its longitudinal axis is parallel to the longitudinal axis of the ultrahigh pressure mercury lamp 1, thereby reflecting the reflected light. Loss can be minimized.

Next, a sixth embodiment of the present invention will be described with reference to FIG.
FIG. 9 is a diagram showing the configuration of the light source device according to the invention of this embodiment.
In the same figure, 21 is a bowl-shaped auxiliary reflector provided along the longitudinal direction of the start auxiliary light source 6 on the back side of the start auxiliary light source 6 (surface opposite to the ultrahigh pressure mercury lamp 1). . Other configurations correspond to the same reference numerals shown in FIG.
As shown in the figure, the auxiliary reflector 21 is provided in the starting auxiliary light source 6 so that the amount of ultraviolet light emitted from the starting auxiliary light source 6 toward the discharge space in the light emitting portion 108 of the ultrahigh pressure mercury lamp 1 can be reduced. Since it can be increased, the startability of the ultrahigh pressure mercury lamp 1 can be further improved.

Next, a seventh embodiment of the present invention will be described with reference to FIGS. 2 to 4 and FIG.
FIG. 10 is a diagram showing the configuration of the light source device according to the invention of this embodiment.
In the figure, reference numeral 22 denotes a power supply line connected between an external electrode 62 (see FIG. 3) provided in the auxiliary discharge vessel 63 of the auxiliary start light source 6 and the external lead 106 on the anode side 101 of the ultrahigh pressure mercury lamp 1. It is a through hole. Other configurations correspond to the configurations of the same reference numerals shown in FIG.
As shown in the figure, a high voltage (for example, −14 kV) is supplied to the external electrode 61 of the auxiliary start light source 6 through the conductive holder 7, and the external electrode 62 of the auxiliary start light source 6 is supplied to the power supply line 22. Are connected to ground potential.
That is, the elliptical reflecting mirror 2 is formed with two through holes for power feeding, and the conductive holder 7 that holds the starting auxiliary light source 6 is fixed to one through hole 11 by a fixing means. In addition, a high voltage power supply terminal 9 that electrically connects the high voltage power supply line 4 and the high voltage power supply line 5 is fixed. In the other through hole 23, a power supply line 22 connected to the external electrode 62 of the auxiliary start light source 6 is connected to the ground potential on the anode 101 side of the ultrahigh voltage mercury lamp 1 through the through hole 23.

  In addition, in the light source device of each said embodiment, although the case where a direct current lighting system was employ | adopted was demonstrated, the same function can be show | played not only in this but when an alternating current lighting system is employ | adopted.

It is a figure which shows the structure of the light source device which concerns on invention of 1st Embodiment. It is an expanded sectional view of the ultra high pressure mercury lamp shown in FIG. It is an expanded sectional view of the starting auxiliary light source shown in FIG. It is an expanded sectional view of the fixing means which fixes a starting auxiliary light source and a high voltage electric power feeding terminal to the through hole of the elliptical reflecting mirror shown in FIG. It is a figure which shows the structure of the light source device which concerns on invention of 2nd Embodiment. It is a figure which shows the structure of the light source device which concerns on invention of 3rd Embodiment. It is a figure which shows the structure of the light source device which concerns on invention of 4th Embodiment. It is a figure which shows the structure of the light source device which concerns on invention of 5th Embodiment. It is a figure which shows the structure of the light source device which concerns on invention of 6th Embodiment. It is a figure which shows the structure of the light source device which concerns on invention of 7th Embodiment.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Super high pressure mercury lamp 101,102 Anode and cathode 103 Coil 104 Sealing part 105 Metal foil 106 External lead 107 Discharge space 108 Light emission part 2 Elliptical reflector 3 Base member 4 High voltage feeder 5 High voltage feeder 6 Start auxiliary light source 61, 62 External electrode 63 Auxiliary discharge vessel 7 Conductive holder 8 Eyelet member 9 High voltage power supply terminal 10 Internal tooth washer 11 Through hole 12 Trigger wire 13 First through hole 14 High voltage power supply terminal 15 Trigger wire 16 High voltage supply Electric wire 17 Second through hole 18 Feed line 19 Feed line 20 Parabolic reflector 21 Auxiliary reflector 22 Feed line 23 Through hole

Claims (7)

An ultra high pressure mercury lamp in which a pair of electrodes are arranged opposite to each other in the arc tube and 0.15 mg / mm ³ or more of mercury is enclosed, and the light emitted from the ultra high pressure mercury lamp surrounding the ultra high pressure mercury lamp is covered. A high-voltage power supply line that supplies a high voltage to the ultra-high pressure mercury lamp is inserted into a through-hole formed in the reflective mirror and connected to a high-voltage power supply terminal. In the light source device for fixing the high voltage power supply terminal to the reflecting mirror by fixing means,
A light source device characterized in that a starting auxiliary light source is fixed to the reflecting mirror by the fixing means.   The light source device according to claim 1, wherein the fixing unit fixes a conductive holder that holds the start-up auxiliary light source to the reflecting mirror.   3. The light source according to claim 1, wherein the ultra-high pressure mercury lamp includes a trigger wire that extends in a longitudinal direction along an outer surface thereof and has the same potential as that of the high-voltage power supply line. apparatus. A super high pressure mercury lamp having a trigger wire stretched in the longitudinal direction along the outer surface of the arc tube, with a pair of electrodes facing each other in the arc tube and enclosing 0.15 mg / mm ³ or more of mercury; A reflecting mirror that surrounds the ultra-high pressure mercury lamp and reflects light emitted from the ultra-high pressure mercury lamp toward the radiated region, and the trigger wire is inserted into a through-hole formed in the reflecting mirror. In the light source device connected to the voltage power supply terminal and fixing the high voltage power supply terminal to the reflecting mirror by a fixing means,
A light source device characterized in that a conductive holder for holding a starting auxiliary light source is fixed to the reflecting mirror by the fixing means.   The said auxiliary start light source is arrange | positioned in the virtual reflected light ray of the light from the said ultra-high pressure mercury lamp to the said through-hole, The Claim 1 characterized by the above-mentioned Light source device.   The said reflecting mirror is an elliptical reflecting mirror, The said starting auxiliary light source is arrange | positioned in the area | region outside the light beam condensed by the said reflecting mirror, The one of Claim 1 thru | or 4 characterized by the above-mentioned. The light source device according to claim. The light source device according to any one of claims 1 to 6, wherein the conductive holder includes means for reflecting ultraviolet light emitted from the auxiliary start light source.

Images