JP2010267460A - Light source device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a light source device for improving certainly starting performance of the lamp by irradiating ultraviolet rays of required sufficient quantity on the discharge container even at the hot time immediately after turning off the high-pressure discharge lamp, by a starting light source with a simple structure of reasonable manufacturing cost. <P>SOLUTION: The starting light source 3, which irradiates ultraviolet rays for improving starting performance to a discharge container when starting lighting of the high-pressure discharge lamp 1, is composed of a discharge tube 18 which is connected in parallel to a lighting circuit of the lamp 1, and either one or both of a base end side exposed end part 19c and a tip part 19b of the internal electrode of the discharge tube 18 are installed at a position opposed to an end face 10 of an electrode sealing portion 9L of the lamp 1 inserted into the bottom hole 14 of a concave reflector 2. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

The present invention relates to a light source device used for a liquid crystal projector, a DLP projector, and the like.

Light source devices of liquid crystal projectors and DLP projectors that are required to be small and have a bright projected image use short arc type high-pressure mercury vapor discharge lamps that are small and can obtain high-intensity light emission. The lamps of the type generally have problems that the cold start performance and the hot restrike restart performance are not good, so a start auxiliary light source is provided to improve the start performance. .

In the conventional light source device shown in FIG. 7, a pair of tungsten electrodes 56, 56 are arranged at a central portion of an arc tube 52 made of a quartz glass tube so as to face each other with a short inter-electrode distance of about 1 mm. A discharge vessel 54 filled with a starter gas such as argon gas and bromine is formed, and the electrode 56, the metal foil 57, and the electrode lead 58 are sealed from the discharge vessel 54 to both ends of the arc tube 52. A pair of attached electrode sealing portions 59R and 59L is formed, and a short arc type high-pressure mercury vapor discharge connected to a lighting circuit through electrode leads 58 and 58 protruding from the end faces of the electrode sealing portions 59R and 59L. The lamp 51, the concave reflecting mirror 61 in which one electrode sealing portion 59L of the lamp 51 is inserted and fixed through the bottom hole 62 opened in the bottom of the reflecting mirror, and when the lamp 51 is started to light And an ignition antenna 63 as a starting auxiliary light source for irradiating ultraviolet rays to enhance the starting performance in the discharge vessel 54 (see Patent Document 1).

The ignition antenna 63 is long and extends to the vicinity of the discharge vessel 54 of the lamp 51 along the electrode sealing portion 59L as shown in the enlarged view shown in FIG. 8A and the XX cross-sectional view shown in FIG. Ionized filling in an antenna container 64 made of a quartz glass tube provided with a curved tube portion 65b bent in a semicircular arc shape so as to be wound around the outer periphery of the electrode sealing portion 59L by 180 degrees at the tip of the straight tube portion 65a. Mercury and argon gas, which are objects, are filled, and an electric conductor element 66 made of metal foil (molybdenum foil) is accommodated and disposed on the free end side of the straight pipe portion 65a of the antenna container 64, and the straight pipe portion. An external electrode 67 made of a metal bush is fitted on the free end side of 65a.

In the ignition antenna 63, a portion of the external electrode 67 is fixed to the outer peripheral portion of the electrode sealing portion 59L with cement 68, and the external electrode 67 is connected to the lighting circuit of the high-pressure discharge lamp 51 via the current supply conductor 69. A high-frequency AC voltage or a pulse voltage is connected between the external electrode 67 and the electrical conductor element 66 in the antenna container 64 connected to the output portion of the voltage transformation means 71 connected between the current conductors 70R and 70L to be formed. By applying the starting voltage, a discharge is generated in the meantime, and ultraviolet rays are generated. The ultraviolet rays are irradiated into the discharge vessel 54 of the lamp 51 through the straight tube portion 65a and the curved tube portion 65b of the antenna vessel 64, Arc discharge between the electrodes 56 and 56 is promoted.

However, it is troublesome to manufacture the antenna container 64 in which the straight pipe portion 65a and the curved pipe portion 65b are continuous, and there is a drawback that the manufacturing cost increases. In addition, the bent portion 65b of the antenna container 64 is close to the discharge container 54 of the lamp 51, which has a high temperature of about 1000 ° C. when the lamp is lit. There is a problem that the discharge between the conductive element 66 and the conductive element 66 becomes unstable, and the restart performance during hot operation is not good, and at the same time, the antenna container 64 may be damaged due to thermal damage.

Further, in the process in which ultraviolet rays generated by the discharge between the external electrode 67 and the electric conductor element 66 are guided into the discharge vessel 54 of the lamp 51 through the long straight tube portion 65a and the curved tube portion 65b of the antenna vessel 64. There is a problem in that it is reflected, refracted, or absorbed and absorbed by the filler in the antenna container 64. Further, since the bent tube portion 65b of the antenna container 64 is disposed close to one side of the discharge container 54 of the lamp 51, the temperature distribution at the time of lamp lighting is remarkably different between one side and the opposite side of the discharge container 54. At the same time, the lamp life may be impaired, and at the same time, the bent tube portion 65b of the antenna container 64 blocks part of the light radiated from the discharge container 54 of the lamp 51 to the bottom side of the concave reflecting mirror 61. There is also a problem that the use efficiency is lowered. Furthermore, the ignition antenna 63 may fall off from the outer peripheral portion of the electrode sealing portion 59L due to deterioration with time (thermal deterioration) of the cement 68 that fixes the ignition antenna 63 to the outer peripheral portion of the electrode sealing portion 59L.

Therefore, as shown in FIG. 9, the applicant of the present application has a glow discharge tube 80 that generates ultraviolet rays when the high-pressure discharge lamp 51 is turned on, and a cooling air ventilation hole 82 provided on the reflecting mirror from the outside of the concave reflecting mirror 81. Proposed a light source device disposed at a position where the discharge vessel 54 of the lamp 51 can be irradiated with ultraviolet rays through (see Patent Document 2).

In the light source device of FIG. 9, a high pressure discharge lamp 51 having the same basic structure as that of the high pressure discharge lamp of FIG. 7 is inserted into the bottom hole 83 that opens one electrode sealing portion 59L at the bottom of the concave reflecting mirror 81. A glow discharge tube 80 that is attached integrally with the reflecting mirror 81 and that irradiates the discharge vessel 54 with ultraviolet rays that enhance the starting performance when the lamp 51 is turned on is provided outside the reflecting mirror 81. Therefore, the discharge tube 80 is heated to a high temperature when the lamp is turned on, and the mercury vapor pressure inside the discharge tube 80 is not excessively increased, and a glow discharge is generated even when the lamp is hot immediately after the lamp is turned off. Can generate ultraviolet rays.

The glow discharge tube 80 includes a pair of lead wires protruding from both ends of the glass sealed tube 84 while a rare gas such as argon gas containing mercury vapor is sealed inside the glass sealed tube 84 made of quartz glass. An internal electrode 85 made of a metal foil having 86 and 86 is housed and disposed, and a coil-like shape formed by winding a chromium-aluminum iron alloy wire 89 having a wire diameter of about 0.2 mm around the outer periphery of the glass sealed tube 84. Since the external electrode 87 is provided in a simple structure, there is an advantage that the manufacturing cost is not increased.

The internal electrode 85 and the external electrode 87 of the glow discharge tube 80 are connected to the one electrode side 88R and the other electrode side 88L of the lamp lighting circuit, respectively, and the starting electrode is interposed between the internal electrode 85 and the external electrode 87. By applying the high frequency pulse voltage, glow discharge is generated in the mercury vapor in the glass sealed tube 84 which is the main body of the discharge tube 80 to generate ultraviolet rays, and a part of the ultraviolet rays is provided in the reflecting mirror 81. In addition, the discharge container 54 of the lamp 51 disposed inside the reflecting mirror 81 is directly irradiated through the ventilation hole 82 of the cooling air, or is reflected and reflected by the reflecting surface of the reflecting mirror 81.

However, if the installation position of the discharge tube 80 is away from the ventilation hole 82 of the reflecting mirror 81, the amount of ultraviolet rays irradiated into the reflecting mirror 81 through the ventilation hole 82 is reduced, and the starting performance of the lamp 51 is deteriorated. Further, if the discharge tube 80 is installed close to the ventilation hole 82 of the reflecting mirror 81, the ventilation hole 82 is blocked by the discharge tube 80 and the circulation of the cooling air is hindered. There is a problem that the cooling effect decreases.

The discharge tube 80 generates a necessary and sufficient amount of ultraviolet rays toward the discharge vessel 54 of the lamp 51 because the amount of ultraviolet rays generated is small when the number of turns of the coiled external electrode 87 provided on the outer periphery of the discharge tube 80 is small. When the number of turns of the coiled external electrode 87 cannot be increased, the external electrode 87 blocks the ultraviolet rays, and the discharge vessel 54 of the lamp 51 is irradiated with a necessary and sufficient amount of ultraviolet rays. There is also the problem that it cannot be done.

Japanese Patent No. 4112638 Registered Utility Model No. 3137961

The present invention is capable of efficiently irradiating a necessary and sufficient amount of ultraviolet rays into a discharge vessel of a high-pressure discharge lamp with a starting light source having a simple configuration that does not increase the manufacturing cost, and at the same time, A light source device that can reliably operate the starting light source and enhance the starting performance of the high-pressure discharge lamp even at the time, and that the starting light source is not likely to be thermally damaged by the high heat generated when the lamp is lit. Providing is a technical issue.

  In order to solve the above problems, the present invention provides a discharge vessel of an arc tube with a pair of electrodes facing each other and at least mercury and a starter gas sealed between the discharge vessel and both ends of the arc tube. A pair of electrode sealing portions that are hermetically sealed to seal the respective electrodes are formed, and are connected to the lighting circuit through electrode leads protruding from the end faces of the respective electrode sealing portions. A discharge lamp, a concave reflecting mirror attached to the lamp by inserting one of the electrode sealing portions into a bottom hole that opens to the bottom of the reflecting mirror, and an ultraviolet ray that enhances the starting performance when the lamp is turned on. In the light source device including a starting light source that irradiates the light source, a starting voltage applied between the electrodes is applied between the external electrode and the internal electrode when the lighting of the lamp is started. By It is formed of a discharge tube that generates an external line, the proximal end side of the internal electrode is sealed to the pinch seal portion of the discharge tube, and the distal end side is exposed in the discharge tube from the pinch seal portion along the central axis of the discharge tube One or both of the proximal end exposed end portion and the distal end portion of the internal electrode are opposed to the electrode sealing portion end surface of the high-pressure discharge lamp inserted through the bottom hole of the concave reflecting mirror. It is characterized by being provided at a position.

According to the present invention, the discharge tube serving as the light source for starting the high-pressure discharge lamp is disposed at a position facing the end surface of the electrode sealing portion of the high-pressure discharge lamp inserted into the bottom hole opened at the bottom of the concave reflecting mirror. Therefore, the discharge tube is not likely to cause thermal damage due to the influence of high heat generated when the lamp is lit, and at the same time generates a stable discharge even during the hot period immediately after the lamp is extinguished to reliably generate ultraviolet rays. be able to.

In addition, either or both of the proximal end exposed end and the distal end of the internal electrode are provided at a position facing the end face of the electrode sealing portion of the high pressure discharge lamp inserted through the bottom hole of the concave reflecting mirror. Yes.
As a result of measuring the emission intensity distribution of the ultraviolet rays emitted from the discharge tube, it was found that the emission intensity at the exposed end and the distal end of the proximal end of the internal electrode was higher than the other parts. If it is placed, it is possible to effectively use the ultraviolet rays that serve as the starting excitation light, and the starting performance of the high-pressure discharge lamp can be significantly improved.

1 is an overall view showing an example of a light source device according to the present invention. The perspective view which shows an example of the light source for starting of a high pressure discharge lamp. The figure which shows an example of the holder which forms the external electrode of the discharge tube used as the light source for starting. The figure which shows the attachment position of the discharge tube used as the light source for starting. The graph which shows the ultraviolet light emission intensity distribution of the light source for starting. The figure which shows the other attachment state of the light source for starting. The figure which shows the prior art for improving the starting performance of a high pressure discharge lamp. The figure which shows the prior art for improving the starting performance of a high pressure discharge lamp. The figure which shows the prior art for improving the starting performance of a high pressure discharge lamp.

In the best mode of the light source device according to the present invention, a pair of tungsten electrodes are arranged opposite to each other in a discharge vessel of an arc tube made of a quartz glass tube, and a halogen such as mercury and bromine and an argon gas are used. A pair of electrode sealing portions are formed in which a starting gas is sealed, and the portions from the discharge vessel to both ends of the arc tube are hermetically sealed by a shrink seal to seal the electrodes. A high-pressure discharge lamp connected to the lighting circuit via an electrode lead made of molybdenum wire protruding from the end face of the part, and the lamp is attached by inserting one of the electrode sealing parts into a bottom hole opened at the bottom of the reflector And a starting light source for irradiating the discharge vessel with ultraviolet light that enhances the starting performance when the lamp is turned on.

The starting light source is connected in parallel with the lamp to a lighting circuit that applies a starting voltage between the tungsten electrodes when starting the lamp, and the starting voltage is applied between the external electrode and the internal electrode. The inner electrode is sealed to the pinch seal portion of the discharge tube, and the distal end side is exposed from the pinch seal portion to the discharge tube along the central axis of the discharge tube. Of the electrode sealing portion of the high-pressure discharge lamp in which either or both of the proximal end exposed end portion and the distal end portion of the internal electrode are inserted into the bottom hole of the concave reflecting mirror. It is provided at a position facing the end face.

The discharge tube has a main body formed of a glass envelope made of quartz glass, and a rare gas such as argon gas is sealed inside the glass envelope, and an internal electrode made of a metal foil such as a molybdenum foil. A lead wire that is accommodated and welded to one end of the internal electrode protrudes from one end side of the glass sealed tube. The enclosure of the discharge tube is not limited to a rare gas but may be a rare gas containing mercury vapor.

The external electrode is formed of a metal holder that holds the outer peripheral portion of the discharge tube so as to face the end surface of the one electrode sealing portion and fixes it to the electrode lead protruding from the end surface.
The main body of the holder is formed of a metal plate such as a spring stainless steel plate bent into a shape that holds and holds the outer periphery of the discharge tube. The metal plate is bent into a shape that holds and holds the outer peripheral portion of the discharge tube at a position facing the end surface of the one electrode sealing portion, and the surface of the outer peripheral portion that faces the end surface. A window hole that exposes the outer peripheral portion of the discharge tube or the outer peripheral portion of the discharge tube facing the end surface at a position facing the end surface of the one electrode sealing portion. It is bent into a shape to hold and hold.

The light source device shown in FIG. 1 includes a high-pressure discharge lamp 1, a concave reflecting mirror 2 that reflects light emitted from the lamp 1, and a starting light source 3 that generates ultraviolet rays that enhance the starting performance of the lamp 1. The lamp 1 has a pair of tungsten electrodes 6R and 6L facing each other with a short distance of about 1 mm in a discharge vessel 5 of an arc tube 4 made of quartz glass, and is made of mercury and bromine. A metal composed of each of the electrodes 6R and 6L and a molybdenum foil connected to each of the electrodes 6R and 6L is sealed by hermetically sealing a portion from the discharge vessel 5 to both ends of the arc tube 4 with a starting gas such as halogen and argon gas sealed therein. A pair of electrode sealing portions 9R and 9L are formed by sealing the foil 7 and the electrode lead 8 made of molybdenum wire. The electrode leads 8, 8 protruding from the end faces 10 of the electrode sealing portions 9R, 9L are connected to the one-pole side 12R and the other-pole side 12L of the lighting circuit 11 for supplying lamp power, respectively, and the electrode 6R. , A metal wire 13 serving as a trigger line / antenna wire for promoting arc discharge between 6L is connected to the electrode lead 8 projecting from the end face 10 of the electrode sealing portion 9R, and the other end side is an electrode sealing portion. It is wired so as to be wound around the outer periphery of 9L in a loop shape.

The concave reflecting mirror 2 is formed with a bottom hole 14 at the bottom thereof through which one electrode sealing portion 9L of the high pressure discharge lamp 1 is inserted and fixed with cement or the like, and at the reflection portion, the high pressure discharge lamp 1 is formed. A wiring hole 16 through which a lead wire 15 made of a nickel wire connected to the electrode lead 8 protruding from the other electrode sealing portion 9R is inserted, and is pulled out from the wiring hole 16 to the back surface of the reflecting portion. A wiring fitting 17 for fixing the lead wire 15 is fixed.

The starting light source 3 is connected in parallel with the lamp 1 to a lighting circuit 11 that applies a starting voltage between the electrodes 6R and 6L when the high-pressure discharge lamp 1 is started to light, and an internal electrode 19 of the discharge tube 18 When a starting voltage is applied between the external electrode 20 and the external electrode 20, ultraviolet rays are generated.

The main body of the discharge tube 18 is formed of a glass sealed tube 21 made of quartz glass, and the inside of the glass sealed tube 21 is filled with a rare gas such as argon gas, and a lead wire 22 is welded to one end. An internal electrode 19 made of a metal foil such as molybdenum foil is accommodated. The glass sealing tube 21 is sealed off by tip-off on one end side, and the other end side is pinch-sealed, and the welded portion between the internal electrode 19 and the lead wire 22 is sealed to the pinch seal portion 23. . That is, the base electrode 19a welded to the lead wire 22 is sealed to the pinch seal 23 of the discharge tube 18, and the internal electrode 19 is pinched along the central axis 21x of the glass sealed tube 21 until reaching the tip 19b. It extends from the seal portion 23 so as to be exposed in the discharge space 21a. As a result, the base end exposed end portion 19c to the distal end portion 19b are exposed in the discharge space 21a. In addition, the internal electrode 19 is connected to the one pole side (electrode 6R side) 12R of the lighting circuit 11 via a lead wire 22 protruding from the pinch seal portion 23 of the glass sealed tube 21.

The external electrode 20 of the discharge tube 18 is held so that the outer peripheral portion 24 of the discharge tube 18 is opposed to the end surface 10 of the electrode sealing portion 9L of the lamp 1 inserted through the bottom hole 14 of the reflecting mirror 2. Stainless steel for springs having a thickness of 0.2 mm, which is formed by a metal holder H1 fixed to the electrode lead 8 projecting from the holder and bent into a shape for holding and holding the outer peripheral portion 24 of the discharge tube 18 A holder body 25 formed of a metal plate such as a steel plate (SUS304-CSP), and a terminal 26 for fixing and electrically connecting this to the electrode lead 8 protruding from the end face 10 of the electrode sealing portion 9L Is formed.

The metal plate forming the main body 25 of the holder H1 is bent into a shape that is held and held so as to cover the outer peripheral portion 24 of the discharge tube 18 at a position facing the end face 10 of the electrode sealing portion 9L. A window hole 27 for exposing the surface of the outer peripheral portion 24 facing the end face 10 of the electrode sealing portion 9L is formed in the plate. Further, a tab terminal to be the fixing terminal 26 is formed by a part of the metal plate, and the tab terminal is bent so as to hold the electrode lead 8 as shown by the solid line from the state shown by the chain line in FIG. By spot welding to the electrode lead 8, the discharge tube 18 is firmly fixed to the electrode lead 8 made of a molybdenum wire having rigidity, and at the same time, the external electrode 20 made of a metal holder H1 is made. The lighting circuit 11 is electrically connected to the other pole side (electrode 6L side) 12L.

Then, the discharge tube 18 is attached to the external electrode 20 formed of the holder H1.
In this case, the discharge tube 18 includes one of the base electrode side exposed end portion 19c and the tip end portion 19b of the internal electrode 19, and one side of the high pressure discharge lamp 1 inserted through the bottom hole 14 of the concave reflecting mirror 2. It is provided at a position facing the end face 10 of the electrode sealing portion 9L.
In this case, as shown in FIG. 4 (a), the tip 19b of the internal electrode 19 is disposed in a virtual cylinder 9a obtained by extending the outer peripheral surface of the sealing portion 9L of the high-pressure discharge lamp 1, or 4 (b), the proximal end exposed end 19c of the internal electrode 19 is disposed in the virtual cylinder 9a, and further, the proximal end exposed end 19c extends from the distal end 19b of the internal electrode 19. If the length to reach is smaller than the diameter of the virtual cylinder 9a, it is most preferable that both of them are located in the virtual cylinder 9a.

FIG. 5 is an explanatory diagram showing the emission intensity distribution of ultraviolet rays, where the X axis is the position in the longitudinal direction of the electrode and the Y axis is the ultraviolet emission intensity. According to this, it turns out that the emitted light intensity of the front-end | tip part 19b and the base end side exposed end part 19c of the internal electrode 19 is high. This is because when the starting voltage is applied, the inner electrode 19 and the inner surface of the discharge space 21a are polarized to the positive electrode and the negative electrode, and electric lines of force concentrate on the distal end portion 19b. Since the glass sealed tube 21 is pinch-sealed in the vicinity of the portion 19c, the gap between the internal electrode 19 and the inner surface of the discharge space 21a is small, so it is presumed that discharge is likely to occur.

Thus, at the start of lighting of the high-pressure discharge lamp 1, a starting voltage is applied from the lighting circuit 11 between the internal electrode 19 and the external electrode 20 of the discharge tube 18, and the glass sealed tube 21 forming the main body of the discharge tube 18. A discharge for exciting the rare gas is generated in the rare gas enclosed in the inside, and ultraviolet rays are generated. The ultraviolet rays are emitted from the window hole 27 formed in the main body 25 of the holder H1 that forms the external electrode 20. The start gas enclosed in the discharge vessel 5 is excited by being incident on the end face 10 of the electrode seal portion 9L of the lamp 1 and transmitting and propagating through the electrode seal portion 9L and being irradiated into the discharge vessel 5. At the same time, the tungsten forming the electrodes 6R and 6L emits initial electrons necessary for starting the discharge, and the start-up of the high-pressure discharge lamp 1 is promoted.

At this time, in the discharge tube 18 serving as the starting light source 3, either one or both of the distal end portion 19 b and the proximal end exposed end portion 19 c of the internal electrode 19 has an end face 10 of the electrode sealing portion 9 </ b> L of the high-pressure discharge lamp 1. Since the ultraviolet rays output from the portion having a high emission intensity distribution are not only incident on the cross section 10 but also disposed at a position facing the end face 10, the lamp is being lit. Therefore, even when the lamp is hot immediately after the lamp is turned off, the discharge can be stably generated and ultraviolet rays can be generated. The external electrode 20 of the discharge tube 18 is formed of a holder H1 made of a metal plate bent into a shape that holds and holds the outer peripheral portion 24 of the discharge tube 18 in which the internal electrode 19 is accommodated. Since the area is large, it is possible to generate a necessary and sufficient amount of ultraviolet rays to enhance the starting performance of the lamp. In addition, since the outer peripheral portion 24 of the discharge tube 18 faces the end surface 10 of the electrode sealing portion 9L, the ultraviolet rays generated in the discharge tube 18 are efficiently incident on the end surface 10 of the electrode sealing portion 9L. Can do.

Further, since the discharge tube 18 has a simple configuration, its manufacturing cost is not increased. Further, since the holder H1 that holds the outer peripheral portion 24 of the discharge tube 18 is fixed by welding to the electrode lead 8 of the lamp 1, there is no possibility of dropping from the electrode lead 8, and the electrode lead 8 has rigidity. Since the electrode lead 8 is bent unexpectedly, the outer peripheral portion 24 of the discharge tube 18 held by the holder H1 does not face the end face 10 of the electrode sealing portion 9L. There is no risk of it occurring.

Furthermore, as described above, the discharge tube 18 is not limited to the case where the central axis 18X extending in the longitudinal direction is arranged in parallel to the end face 10 of the electrode sealing portion 9L of the lamp 1, but is shown in FIG. As shown, it may be inclined.
However, in the case of the inclination angle θ> 30 degrees, the ultraviolet rays emitted from the distal end portion 19b or the proximal end exposed end portion 19c of the internal electrode 19 and directed to the end face 10 of the electrode sealing portion 9L of the lamp 1 are glass sealed tube. When passing through 21, the light is refracted on the inner and outer surfaces of the discharge space 21a, so that the amount of ultraviolet irradiation to the end face 10 is reduced. As a result, the amount of ultraviolet rays reaching the discharge vessel 5 is reduced, and not only the efficiency is lowered. , Θ becomes larger, the distance between the central axis 18X and the electrode lead 8 of the lamp 1 approaches, so that there is a high possibility of causing a discharge and a short circuit therebetween.
Therefore, the inclination angle θ of the central axis 18X with respect to the end face 10 is
−30 ° ≦ θ ≦ + 30 °
It is desirable to be arranged in.

Furthermore, the internal electrode 19 is not limited to being formed of molybdenum foil, but may be formed in a rod shape.

The present invention contributes to an improvement in starting performance of a high-pressure discharge lamp used in a light source device such as a liquid crystal projector or a DLP projector.

1 High pressure discharge lamp 1
2 Concave reflector 2
3 Light source for starting 3
4 arc tube 4
5 Discharge vessel 5
6R, 6L Tungsten electrode 6R, 6L
7 Metal foil 7
8 Electrode lead 8
9R, 9L Electrode sealing part 9R, 9L
9a Virtual cylinder 9a
10 End face 10
11 Lighting circuit 11
12R Single pole side 12R
12L Other pole side 12L
13 Metal wire 13
14 Bottom hole 14
15 Lead wire 15
16 Wiring hole 16
17 Wiring bracket 17
18 Discharge tube 18
19 Internal electrode 19
19a Base end 19a
19b Tip 19b
19c Proximal end exposed end 19c
20 External electrode 20
21 Glass sealed tube 21
21x Center axis 21x
21a Discharge space 21a
22 Lead wire 22
23 Pinch seal part 23
24 outer peripheral part 24
H1 Holder H1
25 Holder body 25
26 Terminal 26
27 Window hole 27

Claims (2)

In the discharge vessel of the arc tube, a pair of electrodes are arranged opposite to each other, at least mercury and a starting gas are enclosed, and the portions from the discharge vessel to both ends of the arc tube are hermetically sealed to A pair of electrode sealing portions sealed with electrodes are formed, and a high-pressure discharge lamp connected to a lighting circuit via an electrode lead protruding from an end face of each electrode sealing portion, and the lamp includes the electrode sealing portion A concave reflecting mirror that is attached by being inserted through a bottom hole that opens at the bottom of the reflecting mirror, and a starting light source that irradiates the discharge vessel with ultraviolet light that enhances the starting performance when the lamp is turned on. In the light source device,
The starting light source is formed of a discharge tube that generates ultraviolet rays when a starting voltage applied between the electrodes at the start of lighting of the lamp is applied between the external electrode and the internal electrode,
The proximal end side of the internal electrode is sealed to the pinch seal portion of the discharge tube, and the distal end side is extended along the central axis of the discharge tube so as to be exposed from the pinch seal portion into the discharge tube,
Either or both of the proximal end exposed end and the distal end of the internal electrode are provided at a position facing the end surface of the electrode sealing portion of the high-pressure discharge lamp inserted through the bottom hole of the concave reflecting mirror. A light source device characterized by the above. The inclination angle θ of the central axis of the internal electrode is relative to the end surface of the electrode sealing portion of the high-pressure discharge lamp.
−30 ° ≦ θ ≦ + 30 °
The light source device according to claim 1.

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