WO2010131574A1 - 光源装置 - Google Patents
光源装置 Download PDFInfo
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- WO2010131574A1 WO2010131574A1 PCT/JP2010/057462 JP2010057462W WO2010131574A1 WO 2010131574 A1 WO2010131574 A1 WO 2010131574A1 JP 2010057462 W JP2010057462 W JP 2010057462W WO 2010131574 A1 WO2010131574 A1 WO 2010131574A1
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- electrode
- light source
- discharge tube
- starting
- lamp
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
- H01J61/00—Gas-discharge or vapour-discharge lamps
- H01J61/84—Lamps with discharge constricted by high pressure
- H01J61/86—Lamps with discharge constricted by high pressure with discharge additionally constricted by close spacing of electrodes, e.g. for optical projection
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
- H01J61/00—Gas-discharge or vapour-discharge lamps
- H01J61/02—Details
- H01J61/54—Igniting arrangements, e.g. promoting ionisation for starting
Definitions
- the present invention relates to a light source device used for a liquid crystal projector, a DLP projector, an illumination device, and the like.
- Light source devices for liquid crystal projectors and DLP projectors which are required to be small and have a bright projected image, use a short arc type high-pressure mercury vapor discharge lamp that is small and can provide high-intensity light emission. Since there are problems that the lamps of the lamps generally do not have a good cold start condition or hot restart function, a start auxiliary light source is provided to improve the start performance. .
- the light source device shown in FIG. 13 is provided with a discharge tube 80 that irradiates the discharge vessel 54 of the lamp 51 with ultraviolet rays when the high-pressure discharge lamp 51 is turned on (see Patent Document 1).
- a pair of tungsten electrodes 56 and 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 starting gas such as a halogen gas and an argon gas is formed, and a pair of electrodes 56, a metal foil 57, and an electrode lead 58 are sealed from the discharge vessel 54 to both ends of the arc tube 52.
- Electrode sealing portions 59R and 59L are formed and connected to the lighting circuit via electrode leads 58 and 58 protruding from the end surfaces of the electrode sealing portions 59R and 59L.
- the high-pressure discharge lamp 51 is attached integrally with the reflecting mirror 81 by inserting one electrode sealing portion 59L through the bottom hole 83 opened at the bottom of the concave reflecting mirror 81 and turning on the lamp 51.
- a glow discharge tube 80 serving as a starting auxiliary light source for irradiating the discharge vessel 54 with ultraviolet rays for enhancing the starting performance at the start is provided.
- 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.
- 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.
- 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.
- the coil-shaped external electrode 87 is provided on the outer peripheral portion thereof, if the number of turns of the coil is small, the amount of ultraviolet rays generated from the discharge tube 80 is small, so that it is necessary and sufficient toward the discharge vessel 54 of the lamp 51. If the number of turns of the coil-shaped external electrode 87 is increased, the external electrode 87 blocks the ultraviolet light, and the discharge vessel 54 of the lamp 51 has a necessary and sufficient amount. There is also a problem that ultraviolet rays cannot be irradiated. Further, the discharge tube 80 is held in place by connecting the lead 86 of the internal electrode 85 and the coiled external electrode 87 to the one pole side 88R and the other pole side 88L of the lamp lighting circuit. When the electrical connection and mechanical holding of the discharge tube 80 are combined by connecting leads and coils, there arises a problem that the positioning of the discharge tube 80 is difficult, but when a separate fixing means is provided. The structure is complicated.
- the present invention provides a discharge vessel of an arc tube with a pair of electrodes facing each other and at least a luminescent substance and a starting gas sealed therein, and the discharge vessel is filled with the arc tube.
- a pair of electrode sealing portions are formed by hermetically sealing the portions reaching both ends and sealing the electrodes, and are connected to the lighting circuit via electrode leads protruding from the end faces of the electrode sealing portions.
- a light source device comprising a high-pressure discharge lamp and a starting light source that irradiates the discharge vessel with ultraviolet light that enhances the starting performance when the lamp is turned on
- the starting light source is formed of a discharge tube that generates ultraviolet rays by a starting voltage applied between the electrodes when the lamp is turned on, and the discharge tube is configured to emit light from a pinch seal portion formed at one end thereof.
- an external electrode provided close to or in close proximity to both the light emitting portion and the pinch seal portion, and at least a portion provided in the light emitting portion grips the discharge tube.
- It is formed of a holder in which a metal plate is bent into a shape to be held, and the holder is formed with a terminal that is fixed and electrically connected to a conductor component to which a voltage having a polarity opposite to that of the internal electrode is applied. It is said.
- At least the portion of the external electrode of the discharge tube that serves as the starting light source for the high-pressure discharge lamp has a shape that holds and holds a part of the outer peripheral surface of the discharge tube exposed. Since the metal plate is formed of a holder that is bent, an external electrode can be provided on the discharge tube simply by mounting the discharge tube on the holder.
- the holder is formed with a terminal for fixing the external electrode to a conductor component to which a voltage having a polarity opposite to that of the internal electrode is applied.
- a terminal for fixing the external electrode to a conductor component to which a voltage having a polarity opposite to that of the internal electrode is applied.
- ultraviolet rays are irradiated from the discharge tube. Since the discharge tube is held in a state in which a part of its outer peripheral surface is exposed by the holder, the ultraviolet light irradiated from the discharge tube is irradiated by attaching the exposed portion toward the discharge vessel of the high-pressure discharge lamp. The discharge vessel of the high-pressure discharge lamp is irradiated from the portion exposed by the holder.
- the area of the external electrode is larger than that provided only in the light emitting part,
- the portion provided in the light emitting part is formed so as to bend the metal plate and grasp the outer peripheral surface of the discharge tube, the portion provided in the light emitting part is compared with the coiled external electrode, etc. Since the area increases and the amount of ultraviolet rays emitted from the discharge tube increases, the high-pressure discharge lamp can be started and lit at a low voltage, and the starting performance of the high-pressure discharge lamp is improved.
- FIG. 1 is an overall view showing an example of a light source device according to the present invention.
- Explanatory drawing which shows an example of the discharge tube used as the light source for starting.
- Explanatory drawing which shows the other Example of a light source device.
- the perspective view which shows the other example 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.
- Explanatory drawing which shows the further another example of the discharge tube used as the light source for starting.
- the figure which shows the example of the metal piece for electric charge concentration part formation The schematic diagram which shows the ionization state in a discharge tube.
- 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 section, and a starting light source for irradiating the discharge vessel with ultraviolet rays that enhance the starting performance when starting the lamp And.
- 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.
- a discharge tube that generates ultraviolet rays is provided.
- the internal electrode of the discharge tube is sealed so that the base end side is sealed by a pinch seal portion formed at one end of the discharge tube, and the distal end side is extended from the pinch seal portion to the light emitting portion.
- the external electrode is provided close to or in close proximity to both the light emitting part and the pinch seal part, and at least the part provided in the light emitting part holds and holds a part of the outer peripheral surface of the discharge tube exposed.
- the holder is formed by bending a metal plate into a shape to be formed, and the holder is formed with a terminal for fixing and electrically connecting the external electrode to a conductor component to which a voltage having a polarity opposite to that of the internal electrode is applied. .
- 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 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 projecting 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 on one end side, and the electrode sealing portion on the other end side. 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 by 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.
- a rare gas such as argon gas
- the glass sealed tube 21 is chipped off and sealed at one end side of the light emitting portion 23a filled with a rare gas, and the other end side is pinch-sealed to form a pinch seal portion 23b.
- the pinch seal portion 23b is sealed with a metal foil 28 such as a molybdenum foil welded to the internal electrode 19 and the lead wire 22 at both ends.
- the internal electrode 19 is extended so that the base end portion 19a is sealed to the pinch seal portion 23b of the discharge tube 18 and the tip end portion 19b is exposed from the pinch seal portion 23b into the light emitting portion 23a. . Further, the internal electrode 19 is connected to the one pole side (electrode 6R side) 12R of the lighting circuit 11 through a lead wire 22 protruding from the pinch seal portion 23b of the glass sealed tube 21.
- the external electrode 20 of the discharge tube 18 is provided close to or in close contact with both the light emitting portion 23a and the pinch seal portion 23b, and at least a portion provided in the light emitting portion 23a covers a part of the outer peripheral surface 24 of the discharge tube 18.
- the holder H1 is formed by bending a metal plate into a shape that is held and held in an exposed state.
- a metal plate is bent so as to cover the outer peripheral surface 24 of the discharge tube 18, and the tip butting portion is formed in a separated shape, and the end surface 10 of the electrode sealing portion 9L
- a slit portion 20a that exposes a part of the outer peripheral surface 24 of the discharge tube 18 that faces is formed, and is formed in a shape that covers the outer peripheral surface 24 while leaving a portion exposed by the slit portion 20a.
- the inner surface of the portion covering the outer peripheral surface of the discharge tube 18 is formed on the ultraviolet reflecting surface 20b, and by irradiating as much as possible the ultraviolet rays radiated from the discharge tube 18 toward the slit portion 20a, the irradiation of the ultraviolet rays is performed. The amount can be increased substantially.
- the holder H1 is a terminal for fixing and electrically connecting the external electrode 20 to a conductor component (electrode lead 8) to which a voltage having a polarity opposite to that of the internal electrode 19 is applied by a part of the metal plate.
- a crimp tab terminal 26 is formed.
- a spring stainless steel having a thickness of 0.2 mm is provided so that the portions provided on the light emitting portion 23a and the pinch seal portion 23b grip and hold the outer peripheral surfaces of the light emitting portion 23a and the pinch seal portion 23b, respectively. It is formed by bending a single metal plate such as a steel plate (SUS304-CSP).
- the terminal 26 of the holder H1 is bent so as to hold the electrode lead 8 and spot-welded to the electrode lead 8, so that the discharge tube 18 has a rigid molybdenum.
- the external electrode 20 made of a metal holder H1 is electrically connected to the other pole side (electrode 6L side) 12L of the lighting circuit 11. ing.
- ultraviolet rays radiated from the outer peripheral surface 24 of the discharge tube 18 toward the end surface 10 of the electrode sealing portion 9L are directly incident on the end surface 10, and at the same time, from the outer peripheral surface 24 of the discharge tube 18 to the inner surface of the holder H1. Since the ultraviolet rays radiated toward the surface are also reflected by the inner surface and incident on the end surface 10 of the electrode sealing portion 9L, the starting performance of the lamp is remarkably improved.
- the holder H1 is fixed to the electrode lead 8 with the slit 20a of the holder H1 facing upward so as to face the end face 10 of the electrode sealing portion 9L of the high pressure discharge lamp 1, and the glass sealed tube 21 is inserted into this.
- the discharge tube 18 including the external electrode 20 is attached.
- the lead wire 22 of the internal electrode 19 of the discharge tube 18 is connected to the unipolar side (electrode 6R side) 12R of the lighting circuit 11 by welding or the like, the mounting operation of the discharge tube 18 serving as the starting light source is completed.
- the holder H1 can be temporarily fixed to the electrode lead 8 by bending the tab terminal 26, its positioning becomes easy, and since it is electrically connected via the tab terminal 26, the troublesome external electrode 20 Wiring work can also be simplified.
- the high pressure discharge lamp 1 when the high pressure discharge lamp 1 is turned on, 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 constituting 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 slit 20a of the holder H1 forming the external electrode 20, and the electrode sealing portion of the lamp 1 is emitted.
- the starting gas sealed in the discharge vessel 5 is excited, and the electrodes 6R, Tungsten forming 6L emits initial electrons necessary for the start of discharge, and the start-up of the high-pressure discharge lamp 1 is promoted.
- the external electrode 20 of the discharge tube 18 is provided in close proximity or close to both the light emitting portion 23a and the pinch seal portion 23b, and at least a portion provided in the light emitting portion 23a grips and holds the outer peripheral surface 24 thereof. Since it is formed by the holder H1 made of a metal plate bent into a shape, the electrode area is markedly greater than when it is provided only in the light emitting part or when it is formed by winding a coil. It is large and can generate a necessary and sufficient amount of ultraviolet rays to enhance the starting performance of the lamp.
- the slit portion 20a of the holder H1 is opposed to the end surface 10 of the electrode sealing portion 9L, and the inner surface side of the portion covering the outer peripheral surface 24 of the discharge tube 18 is formed by the ultraviolet reflecting surface 20b.
- Ultraviolet rays generated in the discharge tube 18 can be radiated from the slit portion 20a without waste and efficiently incident on the end face 10 of the electrode sealing portion 9L.
- it is provided at a position facing the end face 10 of the electrode sealing portion 9L of the high-pressure discharge lamp 1 as in this example, it will not be heated to a high temperature while the lamp is turned on. Even at times, discharge can be stably generated and ultraviolet rays can be generated.
- the discharge tube 18 has a simple configuration, its production cost is not increased. Further, since the holder H1 that holds the outer peripheral surface 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 off from the electrode lead 8, and the electrode lead 8 has rigidity. Since the electrode lead 8 is bent unexpectedly, the outer peripheral surface 24 of the discharge tube 18 held by the holder H1 does not face the end surface 10 of the electrode sealing portion 9L. There is no risk of it occurring.
- FIG. 3 shows another embodiment.
- symbol is attached
- a ceramic metal halide lamp in which a ceramic heat-resistant light-emitting tube 33 is housed in a glass hermetic tube 32 is used as the high-pressure discharge lamp 31.
- a discharge tube 18 is arranged.
- the airtight tube 32 is hot-pressed at one end side to form a pinch seal portion 34, and a pair of lead wires 36A, 36B connected to electrode leads 35A, 35B led out from both ends of the arc tube 33 are the pinch seal. It is led out of the airtight tube 32 from the portion 34.
- the ceramic arc tube 33 is provided with a pair of electrodes (not shown) facing each other in the discharge vessel 37, and at least a luminescent substance and a starting gas are enclosed between the discharge vessel 37 and both ends of the arc tube 32.
- a pair of electrode sealing portions 38A and 38B are formed by hermetically sealing the portions leading to the ends and sealing the electrodes, and the electrode leads 35A and 35B protruding from the end surfaces of the electrode sealing portions are lead wires. It is connected to a lighting circuit (not shown) via 36A and 36B.
- the holder H1 serving as the external electrode 20 of the discharge tube 18 has its slit portion 20a facing the arc tube 33 so that the tab terminal 26 holds the lead wire 36B that supplies power to the other electrode lead 35B of the arc tube 33. It is bent and crimped, and is spot welded and fixed.
- the lead wire 22 of the internal electrode 19 is welded to a lead wire 36 ⁇ / b> A that supplies power to one electrode lead 35 ⁇ / b> A of the arc tube 33.
- the holder H1 can be easily fixed, the wiring work to the external electrode 20 can be simplified, and the internal electrode 19 of the discharge tube 18 attached to the holder H1 is connected to the lead wire 36A. It is possible to easily attach the discharge tube 18 serving as a starting light source.
- a starting voltage is applied between the internal electrode 19 and the external electrode 20 of the discharge tube 18 via the lead wires 36A and 36B, and ultraviolet rays are generated in the discharge tube 18.
- the ultraviolet ray is emitted from the slit 20a of the holder H1 and applied to the arc tube 33, the starting gas sealed in the arc tube 33 is excited and an electrode (not shown) is formed.
- the tungsten to be emitted emits initial electrons necessary for the start of discharge, and the start of the high-pressure discharge lamp 31 is promoted.
- the electrode area is remarkably large, so as to improve the starting performance of the lamp. A necessary and sufficient amount of ultraviolet rays can be generated. Further, since the slit portion 20a of the holder H1 is opposed to the end face 10 of the electrode sealing portion 9L, and the inner surface side of the portion covering the outer peripheral surface 24 of the discharge tube 18 is formed by an ultraviolet reflecting surface, Ultraviolet rays generated in the tube 18 can be radiated without waste from the slit portion 20a and can be efficiently incident on the end face 10 of the electrode sealing portion 9L.
- the outer electrode 20 is provided so that the portions provided on the light emitting portion 23a and the pinch seal portion 23b grip and hold the outer peripheral surfaces of the light emitting portion 23a and the pinch seal portion 23b, respectively.
- the portion to be formed may be formed by, for example, winding a coil having one end connected to the holder H1 around the pinch seal portion 23b.
- the internal electrode 19 of the discharge tube 18 is not limited to the rod-shaped one, and may be a case where the metal foil 28 is directly extended in the light emitting portion 23a.
- the main body of the discharge tube 18 serving as the starting light source 3 of this example is formed of a glass sealed tube 21 made of quartz glass, and the glass sealed tube 21 is filled with a rare gas such as argon gas.
- An internal electrode 19 made of a metal foil such as molybdenum foil with a lead wire 22 welded to one end is accommodated.
- the glass sealed tube 21 is formed by chipping off and sealing one end of the light emitting portion 23a filled with a rare gas and pinching and sealing the other end to the internal electrode 19 and the lead. The welded portion with the wire 22 is sealed.
- the inner electrode 19 is welded to the lead wire 22 at the base end portion 19a sealed by the pinch seal portion 23b of the discharge tube 18, and is pinched along the central axis 18x of the glass sealed tube 21 up to the tip end portion 19b. It extends so that it may be exposed in the light emission part 23a from the seal
- the external electrode 20 of the discharge tube 18 is held so that the outer peripheral surface 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 formed by a metal holder H2 fixed to the electrode lead 8 projecting from the holder and bent into a shape for holding and holding the outer peripheral surface 24 of the discharge tube 18
- the metal plate forming the main body 25 of the holder H2 is bent into a shape that is held and held so as to cover the outer peripheral surface 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 outer peripheral surface 24 facing the end surface 10 of the electrode sealing portion 9L is formed on the plate.
- 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.
- the discharge tube 18 is firmly fixed to the electrode lead 8 made of a rigid molybdenum wire, and at the same time, the external electrode 20 made of a metal holder H2 is fixed.
- the lighting circuit 11 is electrically connected to the other pole side (electrode 6L side) 12L.
- the discharge tube 18 is attached to the external electrode 20 made of the holder H2.
- the discharge tube 18 is sealed with one electrode of the high-pressure discharge lamp 1 in which either or both of the proximal end exposed end 19c and the distal end 19b of the internal electrode 19 are inserted into the bottom hole 14 of the concave reflecting mirror 2. It is provided at a position facing the end face 10 of the portion 9L. In this case, as shown in FIG.
- 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 6 (b), the proximal end side exposed end portion 19c of the internal electrode 19 is disposed in the virtual cylinder 9a, and further, as shown in FIG. 6 (c), the distal end of the internal electrode 19 is positioned. If the length from the part 19b to the base end side exposed end part 19c is smaller than the diameter of the virtual cylinder 9a, it is most preferable that both of them are positioned in the virtual cylinder 9a.
- FIG. 7 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
- 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 enclosed in the glass sealed tube 21 of the discharge tube 18.
- a discharge that excites the rare gas is generated, and ultraviolet rays are generated.
- the ultraviolet rays are emitted from the window hole 27 formed in the main body 25 of the holder H2 that forms the external electrode 20, and the electrode of the lamp 1 is emitted.
- the start gas enclosed in the discharge vessel 5 is excited by being incident on the end face 10 of the seal portion 9L, being transmitted and propagated through the electrode seal portion 9L and being irradiated into the discharge vessel 5.
- the tungsten forming the electrodes 6R and 6L emits initial electrons necessary for the start of discharge, and the start-up of the high-pressure discharge lamp 1 is promoted.
- 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. Therefore, the ultraviolet rays output from the portion having a high emission intensity distribution can be made incident on the end face 10.
- 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, when the inclination angles ⁇ > +30 degrees and ⁇ ⁇ 30 degrees, the light is emitted from the distal end portion 19b or the proximal end exposed end portion 19c of the internal electrode 19 and travels toward the end face 10 of the electrode sealing portion 9L of the lamp 1.
- the inclination angle ⁇ of the central axis 18x with respect to the end face 10 is ⁇ 30 ° ⁇ ⁇ ⁇ + 30 ° It is desirable to be arranged in.
- the internal electrode 19 is not limited to being formed of molybdenum foil, but may be formed in a rod shape as in the first and second embodiments.
- FIG. 9 shows still another embodiment of the starting light source 3 attached to the high-pressure discharge lamp 1 shown in FIG. 1 and 2 are denoted by the same reference numerals, and detailed description thereof is omitted.
- the discharge tube 18 serving as the starting light source 3 of the present example includes at least one charge concentration portion forming metal piece 29 in a glass sealed tube 21 made of quartz glass. 2 is the same as the configuration of the first embodiment (FIG. 2) except that is housed.
- the charge concentration portion forming metal piece 29 is made of, for example, a heat-resistant metal such as molybdenum, nickel, or tungsten, and its shape is arbitrary as long as it fits within the light emitting portion 23a.
- the rectangular plate-like body is not limited to a rectangular plate-like body, but a rectangular plate-like body folded into a corrugated plate shape as shown in FIG. 10 (b), a rod-like one as shown in FIG. 10 (c), FIG. A pipe-shaped one as shown in FIG. 10), a coil-like one as shown in FIG. 10 (e), or a star-shaped one as shown in FIG. 10 (f) can be used.
- the edge portion 30 where the charge concentrates is formed, so that dielectric breakdown is likely to occur. Particularly, when the corner portion 30a is formed in the edge portion 30, Dielectric breakdown is more likely to occur.
- the holder H1 is fixed to the electrode lead 8 with the slit 20a of the holder H1 opposed to the end face 10 of the electrode sealing portion 9L of the high-pressure discharge lamp 1, and the glass sealed tube 21 is inserted into this, the external electrode 20 The discharge tube 18 provided with is attached. Then, if the lead wire 22 of the internal electrode 19 of the discharge tube 18 is connected to the unipolar side (electrode 6R side) 12R of the lighting circuit 11 by welding or the like, the mounting operation of the discharge tube 18 serving as the starting light source is completed. At this time, since the holder H1 can be temporarily fixed to the electrode lead 8 by bending the tab terminal 26, its positioning becomes easy, and since it is electrically connected via the tab terminal 26, the troublesome external electrode 20 Wiring work can also be simplified.
- the high pressure discharge lamp 1 when the high pressure discharge lamp 1 is turned on, 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 internal electrode 19 and the external electrode 20 have opposite polarities.
- 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 internal electrode 19 and the external electrode 20 have opposite polarities.
- an electric field is formed between the two electrodes and dielectric breakdown occurs between the internal electrode and the external electrode, ultraviolet rays are irradiated.
- the charge concentration portion forming metal piece 29 is sealed in the light emitting portion 23a, for example, when the internal electrode 19 and the external electrode 20 are applied to the negative electrode and the positive electrode, respectively, as shown in FIG.
- the metal piece 29 if the metal piece 29 is in contact with the internal electrode 19, it has negative polarity.
- the electric charge concentrates on the edge portion 30 of the metal piece 29, especially the corner portion 30a of the edge, and the distance from the edge portion 30 (30a) to the external electrode 20 becomes short, so the edge portion 30 (30a ), Dielectric breakdown tends to occur, and discharge starts at a low voltage.
- the discharge is started at a low voltage. That is, the light emitting portion 23 a is polarized by the electric field formed between the internal electrode 19 and the external electrode 20, and its inner peripheral surface is applied to the positive electrode having the opposite polarity to the internal electrode 19.
- the metal piece 29 is also opposite in polarity to the internal electrode 19, and electric charges are concentrated on the edge portion 30 (30a), and since the edge portion approaches the internal electrode, dielectric breakdown tends to occur at the edge portion, Discharge starts at low voltage.
- ultraviolet rays are generated from the discharge tube 18, and the ultraviolet rays are emitted from the slits 20a of the holder H1 that forms the external electrode 20, and are incident on the end face 10 of the electrode sealing portion 9L of the lamp 1, and the electrode sealing portion.
- the starting gas sealed in the discharge vessel 5 is excited, and the tungsten forming the electrodes 6R and 6L is initially required for starting the discharge.
- the start of the high-pressure discharge lamp 1 is promoted by emitting electrons.
- FIG. 12 is a graph showing the relationship between the starting voltage and the dielectric breakdown rate of the discharge tube.
- the experimental data D 1 of the discharge tube 18 enclosing the charge concentration portion forming metal piece 29 shown in FIG. condition shown by comparing the experimental data D 2 differ only discharge tube in that it does not enclose the charge concentration-forming metal piece 29 in the same. From this graph, when the starting voltage is 1 kV, the discharge tube not encapsulating the metal piece 29 has a very low dielectric breakdown probability of about 10%, and almost no dielectric breakdown, whereas the metal piece 29 is encapsulated.
- the discharge tube 18 had a dielectric breakdown probability of 100%, and dielectric breakdown was observed in all of them. That is, even if the starting voltage is reduced to 1 kV, the discharge tube 18 is dielectrically broken and ultraviolet rays are reliably generated, so that the starting of the high-pressure discharge lamp 1 is promoted.
- the starting light source of this example is not limited to the case where it is disposed on the end surface 10 of one seal portion 9L of the high-pressure discharge lamp 1 of a double-end type lamp, but is a ceramic metal halide lamp as in Example 2 (FIG. 3). It is also possible to use it provided in the 31 airtight tube 32.
- 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, a DLP projector, or an illumination device.
- High pressure discharge lamp 3 Light source for starting 18 Discharge tube 19 Internal electrode 20 External electrode 20a Slit part 20b Ultraviolet reflecting surface 23a Light emitting part 23b Pinch seal part 24 Outer peripheral surface H holder 26 terminals
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- Discharge Lamps And Accessories Thereof (AREA)
- Vessels And Coating Films For Discharge Lamps (AREA)
Abstract
Description
この高圧放電ランプ51は、石英ガラス管で成る発光管52の中央部に、一対のタングステン電極56、56が約1mm程度の短い電極間距離で互いに対向して配置されると共に、水銀と臭素等のハロゲンとアルゴンガス等の始動用ガスとが充填された放電容器54が形成され、当該放電容器54から発光管52の両端にかけて、電極56と金属箔57と電極リード58とを封着した一対の電極封着部59R、59Lが形成され、当該電極封着部59R、59Lの端面から突出した電極リード58、58を介して点灯回路に接続されている。
そして、この高圧放電ランプ51が、片方の電極封着部59Lを凹面反射鏡81の底部に開口するボトム孔83に挿通して当該反射鏡81と一体的に取り付けられると共に、当該ランプ51の点灯始動時にその始動性能を高める紫外線を放電容器54に向けて照射する始動補助光源となるグロー放電管80が配されている。
また、放電管80は内部電極85のリード86及びコイル状外部電極87をランプ点灯回路の片極側88Rと他極側88Lに接続することにより所定位置に保持させているが、このように、リードやコイルを接続することにより放電管80の電気的接続と機械的保持を兼用させた場合、放電管80の位置決めが困難であるという問題を生じ、かといって、別途固定手段を設けた場合には構造が複雑化する。
前記始動用光源は、前記ランプの点灯始動時に前記電極間に印加される始動用電圧により紫外線を発生する放電管で形成され、当該放電管は、その片端に形成されるピンチシール部から発光部に延設される内部電極と、発光部及びピンチシール部の双方に近接又は密接して設けられた外部電極を備え、当該外部電極は、少なくとも発光部に設けられる部分が、放電管を掴んで保持する形状に金属板を曲げ加工したホルダで形成され、当該ホルダには、内部電極と反対極性の電圧が印加される導体部品に固定して電気的に接続する端子が形成されたことを特徴としている。
放電管は、ホルダによりその外周面の一部を露呈させた状態に保持されているので、露呈された部分を高圧放電ランプの放電容器に向けて取り付けることにより、放電管から照射された紫外線がホルダにより露呈された部分から高圧放電ランプの放電容器に照射されることとなる。
放電管の内部電極は、その基端側が放電管の片端に形成されるピンチシール部に封着され、その先端側がピンチシール部から発光部に露出されるように延設されている。
また、外部電極は、発光部及びピンチシール部の双方に近接又は密接して設けられると共に、少なくとも発光部に設けられる部分が、放電管の外周面の一部を露呈させた状態に掴んで保持する形状に金属板を曲げ加工したホルダで形成され、当該ホルダには、外部電極を内部電極と反対極性の電圧が印加される導体部品に固定して電気的に接続する端子が形成されている。
すなわち、ホルダH1には、放電管18の外周面24を覆うように金属板が曲げ加工されると共に、その先端突合せ部分が離反された形状に形成されて、電極封着部9Lの端面10と対面する放電管18の外周面24の一部を露呈させるスリット部20aが形成され、そのスリット部20aで露呈される部分を残して、その外周面24を覆い隠す形状に形成されている。
さらに、放電管18の外周面を覆う部分の内面は紫外線反射面20bに形成されており、放電管18から放射される紫外線を少しでも多くスリット部20aに向けて案内することにより、紫外線の照射量を実質的に増大させることができる。
このとき、ホルダH1は、タブ端子26を曲げることにより電極リード8に仮止めできるのでその位置決めが容易になり、また、タブ端子26を介して電気的に接続されるので面倒な外部電極20の配線作業も簡略化することができる。
さらに、本例のように、高圧放電ランプ1の電極封着部9Lの端面10と対向する位置に設ければ、ランプの点灯中に高温に熱せられることがないから、ランプ消灯直後の熱間時においても安定的に放電を生じて紫外線を発生させることができる。
気密管32は、その片端側が熱間圧着されてピンチシール部34が形成され、発光管33の両端から導出された電極リード35A、35Bに接続された一対のリード線36A、36Bが前記ピンチシール部34から気密管32の外部に導出されている。
セラミック製発光管33は、放電容器37内に一対の電極(図示せず)が対向して配置されると共に、少なくとも発光物質と始動用ガスが封入され、当該放電容器37から発光管32の両端に至る部分を気密に封止して前記各電極を封着した一対の電極封着部38A、38Bが形成され、当該各電極封着部の端面から突出した前記電極リード35A、35Bがリード線36A、36Bを介して点灯回路(図示せず)に接続されている。
そして、内部電極19のリード線22が発光管33の一方の電極リード35Aに給電するリード線36Aに溶接されている。
そして、高圧放電ランプ31を点灯始動させると、そのリード線36A及び36Bを介して放電管18の内部電極19と外部電極20との間に始動用電圧が印加され、放電管18で紫外線が発生し、当該紫外線が、ホルダH1のスリット20aから放射されて発光管33に照射されることにより、発光管33内に封入された始動用ガスが励起されると共に、電極(図示せず)を形成するタングステンが放電開始に必要な初期電子を放出して高圧放電ランプ31の始動が促進される。
また、ホルダH1にスリット部20aを形成する場合に限らず、透孔を形成する場合であっても良い。
さらに、放電管18の内部電極19はロッド状のものに限らず、金属箔28をそのまま発光部23a内に延設する場合であってもよい。
本例の始動用光源3となる放電管18は、その本体が、石英ガラス製のガラス封管21で形成され、当該ガラス封管21の内部に、アルゴンガス等の希ガスが充填されると共に、片端にリード線22が溶接されたモリブデン箔等の金属箔で成る内部電極19が収容配設されている。なお、ガラス封管21は、希ガスが充填された発光部23aの片端側をチップオフして封止し、他端側をピンチシールして形成したピンチシール部23bに、内部電極19とリード線22との溶接個所が封着されている。すなわち、内部電極19はリード線22と溶接される基端部19aが放電管18のピンチシール部23bに封着され、先端部19bに至るまでガラス封管21の中心軸18xに沿ってそのピンチシール部23bから発光部23a内に露出されるように延設されている。これにより、基端側露出端部19cから先端部19bまでが、発光部21a内に露出されることとなる。また、内部電極19は、ガラス封管21のピンチシール部23bから突出したリード線22を介して点灯回路11の片極側(電極6R側)12Rに接続されている(図1参照)。
また、その金属板の一部で固定用端子26となるタブ端子が形成され、当該タブ端子が図5(a)の鎖線図示の状態から実線図示の如く電極リード8を把持するように折り曲げられて当該電極リード8にスポット溶接されることにより、放電管18が剛直性を有するモリブデンワイヤで成る電極リード8に対して確りと固定されると同時に、金属製のホルダH2で成る外部電極20が、点灯回路11の他極側(電極6L側)12Lに対して電気的に接続されている。
放電管18は、内部電極19の基端側露出端部19c及び先端部19bのいずれか一方または双方が、凹面反射鏡2のボトム孔14に挿通された高圧放電ランプ1の片方の電極封着部9Lの端面10と対向する位置に設けられている。
この場合、図6(a)に示すように高圧放電ランプ1の封着部9Lの外周面を延長した仮想円筒9a内に内部電極19の先端部19bが位置するように配され、あるいは、図6(b)に示すように前記仮想円筒9a内に内部電極19の基端側露出端部19cが位置するように配され、さらに、図6(c)に示すように、内部電極19の先端部19bから基端側露出端部19cに至る長さが前記仮想円筒9aの直径より小さければ、その双方が仮想円筒9a内に位置するように配することが最も好ましい。
これは、始動用電圧を印加したときに、内部電極19と発光部23a内面が正極と負極に分極し、先端部19bには電気力線が集中するため放電がおきやすく、基端側露出端部19c近傍ではガラス封管21がピンチシールされているので内部電極19と発光部23aの内面とのギャップが小さいため放電がおきやすいと推測される。
ただし、傾斜角度θ>+30度及びθ<-30度の場合は、内部電極19の先端部19b又は基端側露出端部19cから放射され、ランプ1の電極封着部9Lの端面10に向かう紫外線が、ガラス封管21を透過する際に、発光部23aの内面及び外面で屈折するので、端面10への紫外線照射量が減り、その結果、放電容器5内に達する紫外線量が減るため効率が低下するだけでなく、θがより大きくなると、中心軸18Xとランプ1の電極リード8との距離が近づくためにこの間で放電及び短絡を起こす可能性が高くなるという問題を生じる。
したがって、端面10に対する中心軸18xの傾斜角度θが、
-30°≦θ≦+30°
で配されていることが望ましい。
本例の始動用光源3となる放電管18は、図9(a)及び(b)に示すように、石英ガラス製のガラス封管21内に、少なくとも一つの電荷集中部形成用金属片29が収容配設された点を除き、実施例1(図2)の構成と同様である。
いずれの電荷集中部形成用金属片29にも、電荷が集中するエッジ部30が形成されているため、絶縁破壊が起こり易く、特に、エッジ部30に角部30aが形成されている場合は、より絶縁破壊が起こり易い。
このとき、ホルダH1は、タブ端子26を曲げることにより電極リード8に仮止めできるのでその位置決めが容易になり、また、タブ端子26を介して電気的に接続されるので面倒な外部電極20の配線作業も簡略化することができる。
このとき、金属片29のエッジ部30、中でも特にエッジの角部30aに電荷が集中し、しかも、そのエッジ部30(30a)から外部電極20までの距離が短くなるので、エッジ部30(30a)で絶縁破壊が起こりやすくなり、低電圧で放電開始される。
すなわち、内部電極19と外部電極20間に形成される電界により、発光部23aは分極されてその内周面は内部電極19の反対極性である正極に印加されているので、内周面に接している金属片29も内部電極19の反対極性を帯び、そのエッジ部30(30a)に電荷が集中し、しかも、そのエッジ部が内部電極に近づくので、エッジ部で絶縁破壊が起こりやすくなり、低電圧で放電開始される。
このグラフより、始動電圧を1kVとしたときに、金属片29を封入していない放電管は絶縁破壊確率が約10%と極めて低く、ほとんどが絶縁破壊しないのに対し、金属片29を封入した放電管18は絶縁破壊確率100%となり、そのすべてで絶縁破壊が観察された。
すなわち、始動電圧を1kVまで低下させても、放電管18が絶縁破壊されて紫外線が確実に発生するので、これにより、高圧放電ランプ1の始動が促進されることとなる。
3 始動用光源
18 放電管
19 内部電極
20 外部電極
20a スリット部
20b 紫外線反射面
23a 発光部
23b ピンチシール部
24 外周面
H ホルダ
26 端子
Claims (9)
- 発光管の放電容器内に、一対の電極が対向して配置されると共に、少なくとも発光物質と始動用ガスが封入され、当該放電容器から発光管の両端に至る部分を気密に封止して前記各電極を封着した一対の電極封着部が形成され、当該各電極封着部の端面から突出した電極リードを介して点灯回路に接続される高圧放電ランプと、当該ランプの点灯始動時にその始動性能を高める紫外線を前記放電容器に向けて照射する始動用光源とを備えた光源装置において、
前記始動用光源は、前記ランプの点灯始動時に前記電極間に印加される始動用電圧により紫外線を発生する放電管で形成され、
当該放電管は、その片端に形成されるピンチシール部から発光部に延設される内部電極と、発光部及びピンチシール部の双方に近接又は密接して設けられた外部電極を備え、
当該外部電極は、少なくとも発光部に設けられる部分が、放電管を掴んで保持する形状に金属板を曲げ加工したホルダで形成され、当該ホルダには、内部電極と反対極性の電圧が印加される導体部品を固定して電気的に接続する端子が形成されたことを特徴とする光源装置。 - 前記高圧放電ランプが、気密に形成された外球内に耐熱性発光管が収納されたメタルハライドランプであり、前記始動用光源が外管内に配され、発光管の両端から突出された電極リードの一方に内部電極が接続され、他方に前記ホルダの端子を介して外部電極が固定された請求項1記載の光源装置。
- 前記高圧放電ランプの片方の前記電極封着部が、凹面反射鏡の底部に開口するボトム孔に挿通して取り付けられ、前記ホルダにより、始動用光源の放電管が露呈された外周面が前記片方の電極封着部の端面と対向させるように保持されて、その端面から突出した前記電極リードに前記端子を介して外部電極が固定された請求項1記載の光源装置。
- 前記外部電極は、発光部及びピンチシール部に設けられる部分が、夫々、発光部及びピンチシール部の外周面を掴んで保持するように一枚の金属板を曲げ加工して形成された請求項1記載の光源装置。
- 前記ホルダは、放電管の外周面を覆うように金属板が曲げ加工されると共に、その先端突合せ部分が離反された形状に形成されて、前記外周面の一部を露呈させるスリット部に形成された請求項1記載の光源装置。
- 前記ホルダは、放電管の外周面を覆う部分の内面が紫外線反射面に形成された請求項1記載の光源装置。
- 前記高圧放電ランプの片方の前記電極封着部が、凹面反射鏡の底部に開口するボトム孔に挿通して取り付けられ、
前記始動用光源となる放電管の発光部内に露出する内部電極の基端側露出端部及び先端部のいずれか一方または双方が、前記凹面反射鏡のボトム孔に挿通された高圧放電ランプの電極封着部端面と対向する位置に設けられた請求項1記載の光源装置。 - 前記内部電極の中心軸の傾斜角度θが、高圧放電ランプの電極封着部の端面に対して、
-30°≦θ≦+30°
である請求項7記載の光源装置。 - 前記始動用光源となる放電管の発光部に、前記内部電極とは別に、少なくとも一つの電荷集中部形成用金属片が封入された請求項1記載の光源装置。
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- 2010-04-27 CA CA2761526A patent/CA2761526A1/en not_active Abandoned
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- 2010-04-27 CN CN2010800208601A patent/CN102428538A/zh active Pending
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EP2469579A3 (de) * | 2010-12-23 | 2013-03-27 | OSRAM GmbH | Hochdruckentladungslampe mit Zündhilfe |
DE102010064040A1 (de) | 2010-12-23 | 2012-06-28 | Osram Ag | Hochdruckentladungslampe mit Zündhilfe |
EP2469579A2 (de) | 2010-12-23 | 2012-06-27 | Osram AG | Hochdruckentladungslampe mit Zündhilfe |
WO2012110074A1 (de) | 2011-02-14 | 2012-08-23 | Osram Ag | Hochdruckentladungslampe mit halogenhalteriger zündhilfe |
WO2013014243A1 (de) | 2011-07-28 | 2013-01-31 | Osram Ag | Hochdruckentladungslampe mit zündhilfe |
WO2013013727A1 (de) | 2011-07-28 | 2013-01-31 | Osram Ag | Hochdruckentladungslampe mit zündhilfe |
CN103493176A (zh) * | 2011-07-28 | 2014-01-01 | 欧司朗股份有限公司 | 具有点燃辅助装置的高压放电灯 |
CN103733302A (zh) * | 2011-07-28 | 2014-04-16 | 欧司朗股份有限公司 | 具有点火辅助装置的高压放电灯 |
US9053921B2 (en) | 2011-07-28 | 2015-06-09 | Osram Gmbh | High-pressure discharge lamp having an ignition aid |
CN103493176B (zh) * | 2011-07-28 | 2016-08-17 | 欧司朗股份有限公司 | 具有点燃辅助装置的高压放电灯 |
CN103733302B (zh) * | 2011-07-28 | 2018-02-27 | 欧司朗股份有限公司 | 具有点火辅助装置的高压放电灯 |
US10269551B2 (en) | 2011-07-28 | 2019-04-23 | Ledvance Gmbh | High-pressure discharge lamp having an ignition aid |
DE102011081277A1 (de) | 2011-08-19 | 2013-02-21 | Osram Ag | Hochdruckentladungslampe mit zündhilfe |
Also Published As
Publication number | Publication date |
---|---|
CN102428538A (zh) | 2012-04-25 |
US8723418B2 (en) | 2014-05-13 |
CA2761526A1 (en) | 2010-11-18 |
US20120091875A1 (en) | 2012-04-19 |
EP2431999A4 (en) | 2013-12-04 |
EP2431999A1 (en) | 2012-03-21 |
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