WO2000016360A1 - Lampe a l'halogenure d'argent anhydre - Google Patents

Lampe a l'halogenure d'argent anhydre Download PDF

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Publication number
WO2000016360A1
WO2000016360A1 PCT/JP1999/004969 JP9904969W WO0016360A1 WO 2000016360 A1 WO2000016360 A1 WO 2000016360A1 JP 9904969 W JP9904969 W JP 9904969W WO 0016360 A1 WO0016360 A1 WO 0016360A1
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WO
WIPO (PCT)
Prior art keywords
mercury
lamp
metal halide
free metal
halide lamp
Prior art date
Application number
PCT/JP1999/004969
Other languages
English (en)
Japanese (ja)
Inventor
Mamoru Takeda
Makoto Horiuchi
Kiyoshi Takahashi
Makoto Kai
Takeshi Saito
Hideaki Kiryu
Original Assignee
Matsushita Electric Industrial Co.,Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Matsushita Electric Industrial Co.,Ltd filed Critical Matsushita Electric Industrial Co.,Ltd
Priority to KR1020007004945A priority Critical patent/KR20010024584A/ko
Priority to US09/554,409 priority patent/US6653801B1/en
Priority to EP99943295A priority patent/EP1032010A4/fr
Publication of WO2000016360A1 publication Critical patent/WO2000016360A1/fr

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Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
    • H01J61/00—Gas-discharge or vapour-discharge lamps
    • H01J61/02—Details
    • H01J61/04—Electrodes; Screens; Shields
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
    • H01J61/00—Gas-discharge or vapour-discharge lamps
    • H01J61/02—Details
    • H01J61/12—Selection of substances for gas fillings; Specified operating pressure or temperature
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
    • H01J61/00—Gas-discharge or vapour-discharge lamps
    • H01J61/82—Lamps with high-pressure unconstricted discharge having a cold pressure > 400 Torr
    • H01J61/827—Metal halide arc lamps
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
    • H01J61/00—Gas-discharge or vapour-discharge lamps
    • H01J61/02—Details
    • H01J61/30—Vessels; Containers
    • H01J61/34—Double-wall vessels or containers

Definitions

  • the present invention relates to a mercury-free metal halide lamp that is used as various light sources such as general lighting and a headlight of an automobile combined with a reflector, etc., and particularly contains no mercury. Things.
  • halogen lamps with tungsten filament have been the mainstream lamps used for automobile headlamps.
  • metal halide lamps which are high-pressure discharge lamps of metal halides, are being used for the purpose of improving efficiency and discriminating white lines.
  • the above-mentioned conventional metal halide lamps are rarely used in arc tubes. Gas, metal halide (solid), and mercury are enclosed. In each of these enclosures, the noble gases are mainly used to make the lamp easy to start or to obtain a strong light output immediately after the start, and the metal halides to obtain the proper light output during stable operation.
  • mercury is encapsulated to obtain the high enough inter-electrode voltage (lamp voltage) required for the lamp to operate properly.
  • a conventional metal-halide lamp for example, a lamp suitable for a vehicle headlight disclosed in Japanese Patent Application Laid-Open No. 59-111124 is known. .
  • a conventional metal halide lamp based on this publication is shown in FIG. 16 and described.
  • reference numeral 101 denotes an arc tube made of quartz, and numerals 102 at both ends of the arc tube 101 are sealing portions.
  • 103 is a pair of electrodes made of tungsten, 104 is a molybdenum foil, and 105 is a lead wire made of the same molybdenum.
  • the electrode 103 is electrically connected to one end of the molybdenum foil 104 sealed in the sealing portion 102, and is further connected to the other end of the molybdenum foil 104.
  • Lead wire 105 is electrically connected.
  • the tip of the electrode 103 in the arc tube 101 is arranged so that the distance between the tips, that is, the distance between the electrodes is about 4.2 (mm).
  • the inner volume of the arc tube 101 is about 0.03 (cc), and about 0.7 mg (about 1.1 mg / cc) of mercury is contained in the arc tube. 106, and a total of about 0.3 mg (about 12.2 mg / cc per unit arc tube volume) of sodium iodide, scandium iodide, and sodium iodide. And 0.7 MPa of Xe gas at room temperature (not shown).
  • the metal halide lamp as described above has a lamp voltage of about 70 to 80 V.
  • the lamp current is about 0.4 to 0.5 A.
  • the lamp voltage drops to about 25V.
  • the lamp current during lighting is about 1.5 A, which is about three times that of the conventional metal halide lamp containing mercury.
  • the heat load (Joule loss) of the electrode increases, and the evaporation of the electrode becomes active. Therefore, a mercury-free lamp with a configuration in which mercury is simply removed from a conventional metal halide lamp, the arc tube turns black in only a few tens of hours, and reaches its life in a very short time.
  • the distance between the electrodes increases due to the evaporation of the electrodes, the operating state of the lamp changes with the elapse of the lighting time, and an excessive load is applied to the drive circuit.
  • the present invention does not fill in mercury and prevents an increase in lamp voltage and blackening of the arc tube 1 due to evaporation of the electrodes and the like over the lighting time.
  • the purpose is to provide a mercury-free metal halide lamp that can achieve a long lamp life without producing it.
  • a mercury-free metal halide lamp that has a pair of discharge electrodes in the arc tube and contains at least a rare gas and a metal halide.
  • S (mm 2) the cross-sectional area of the Kinora lamp current and is lit at the rated power can and was I (a), and this I / S is 2 0 (a / mm 2) or less It is characterized by
  • I / S is 15 (A / mm 2 ) or less.
  • the temperature of the tip of the discharge electrode at the time of lighting at the rated power is 320 K or less.
  • the lamp voltage increases significantly due to the synergistic effect of an increase in the vapor pressure of the metal halide and an increase in the distance between the electrodes due to evaporation of the electrodes with the passage of the lighting time, etc. Since blackening is suppressed, a long lamp life can be obtained.
  • the invention of claim 4 is:
  • a mercury-free metal halide lamp according to claim 3 wherein
  • the temperature characteristic at the tip of the discharge electrode when lit at the rated power is 250 K or more. This makes it easy to start a stable discharge.
  • the invention of claim 5 is:
  • a mercury-free metal halide lamp according to claim 5 wherein
  • the arc tube contains at least one of halide of indium and halogen of indium.
  • the invention of claim 7 is: 4.
  • the invention of claim 8 is:
  • the arc tube contains a halide of thallium.
  • the invention is characterized in that the arc tube contains at least one of a halide of scandium and a halide of sodium.
  • the invention of claim 10 is
  • a mercury-free metal halide lamp according to claim 8 wherein
  • the invention is characterized in that the arc tube contains at least one of a halide of scandium and a halide of sodium.
  • the above-mentioned halide of trivalent indium is characterized in that it is at least one of iodide and bromide.
  • a high lamp voltage can be obtained, so that the current density can be easily suppressed to be small, and therefore, the lamp life can be surely improved.
  • the invention of claim 12 is
  • FIG. 1 is a cross-sectional view showing a mercury-free metal halide lamp according to the first embodiment.
  • FIG. 2 is a graph showing the relationship between the current density of the mercury-free metal halide lamp of Embodiment 1 and the ramp voltage increase rate after lighting for 100 hours.
  • FIG. 3 is a graph showing the relationship between the lighting time, the rate of change of the distance between the electrodes, and the rate of change of the lamp voltage in the mercury-free metal halide lamp of the first embodiment.
  • FIG. 4 is a graph showing the correlation between the rate of change of the electrode distance and the rate of change of the lamp voltage in the mercury-free metal halide lamp of the first embodiment.
  • FIG. 5 is a graph showing the relationship between the current density and the electrode tip temperature in the mercury-free metal halide lamp of the first embodiment.
  • FIG. 6 shows the mercury-free metal halide lamps of Embodiments 3 and 4. Sectional view
  • Figure 7 is a graph showing the relationship between the mercury-free main Taruhara Lee de ramp of + 3-valent fin di ⁇ charging amount of beam of Yo U compound I n I 3 and lamp voltage of the third embodiment
  • FIG. 8 is a graph showing the relationship between the sealing pressure of Xe and the total luminous flux of the mercury-free metal halide lamp of the third embodiment.
  • Figure 9 shows the amount of +3 valent indium iodide I n I 3 and the total luminous flux when the mercury-free metal halide lamp of the third embodiment is turned on with 45 W power.
  • Fig. 10 shows the amount of +3 valent indium iodide I n I;, when the mercury-free metal halide lamp of the third embodiment is turned on with 35 W power. Graph showing the relationship between
  • FIG. 11 is a graph showing the relationship between the amount of thallium iodide and the lamp voltage of the mercury-free metal halide lamp of the fourth embodiment.
  • FIG. 12 is a graph showing the relationship between the amount of the iodide and the total luminous flux of the mercury-free metal halide lamp of the fourth embodiment.
  • FIG. 13 is a graph showing the relationship between the filling pressure of Xe and the lamp voltage of the mercury-free metal halide lamp of the fourth embodiment.
  • FIG. 14 is a graph showing the relationship between the sealing pressure of Xe and the total luminous flux of the mercury-free metal halide lamp of the fourth embodiment.
  • FIG. 15 is a cross-sectional view showing a mercury-free metal halide lamp with the infrared reflecting film of Embodiment 5 coated thereon.
  • Fig. 16 is a cross-sectional view showing a conventional metal halide lamp.
  • the basic principle of the present invention is to extend the lamp life by reducing the current density and the temperature of the electrode tip.
  • a description will be given of a current density capable of extending the life of a lamp and a temperature of an electrode tip.
  • Methods of increasing the lamp voltage include a method of setting a large distance between the electrodes and a method of increasing the vapor pressure of the filling material (luminescent substance) to be filled in the arc tube.
  • Methods for increasing the vapor pressure of the above-mentioned inclusions also include the use of additional high-vapor-pressure enclosures (e.g., halides of scandium and halogenates of lithium). There are a method of using the method and a method of increasing the temperature of the arc tube.
  • Embodiments 3 and 4 a description will be given of an enclosure capable of increasing the vapor pressure in order to increase the lamp voltage.
  • FIG. FIG. 1 is a sectional view showing a mercury-free metal halide lamp according to the first embodiment of the present invention.
  • reference numeral 1 denotes an arc tube made of quartz
  • reference numerals 2 at both ends of the arc tube 1 denote sealing portions.
  • 3 is a pair of electrodes made of tungsten
  • 4 is a molybdenum foil
  • 5 is a lead wire also made of a molybdenum material.
  • the electrode 3 is electrically connected to one end of the molybdenum foil 4 sealed in the sealing portion 2, and a lead wire 5 is electrically connected to the other end of the molybdenum foil 4.
  • a lead wire 5 is electrically connected to the other end of the molybdenum foil 4.
  • the arc tube 1 is filled with a later-described halide 7 and a rare gas (not shown).
  • the area of the tip surface of the electrode 3 (the cross-sectional area of the tip portion when the tip portion is spherical, etc .; hereinafter, collectively referred to as the electrode cross-sectional area) is denoted by S and the electrode.
  • the distance between 3.3 is represented by L
  • the voltage between the electrodes 3 and 3 is represented by V
  • the current flowing between the electrodes 3.3 and 3 is represented by I
  • the discharge arc is represented by A. .
  • the lamp With a lamp power of 45 W, the lamp was lit continuously for 100 hours with a stable discharge arc A, and the lamp voltage was measured.
  • Figure 2 shows the relationship between the ramp voltage rise rate and the current density (lamp current 1 / electrode cross-sectional area S).
  • the measurement error of about 3% is represented by an error bar.
  • the ramp voltage increase rate increases extremely when the current density exceeds about 2 OA / mm 2 .
  • part of the electrode 3 evaporates, and the remaining part is deformed into a fold.
  • the evaporation causes blackening of the arc tube 1, and the luminous flux maintenance rate is greatly reduced.
  • the current density is large, the arc tends to be unstable.
  • the ramp voltage rise rate R v becomes about 0.1 or less, which satisfies the condition generally regarded as a non-defective product limit. If the current density is about 1 OA / mm 2 or less, the ramp voltage rise rate can be significantly reduced. In these cases (for example, in the case of 8 A / mm 2 ), the electrode 3 was hardly deformed, and the luminous flux was not reduced by blackening.
  • the ramp voltage Via is generally linear
  • N is the particle density in the lamp
  • L is the distance between the electrodes.
  • a mercury-free run-flop about 2 5 A / mm 2
  • chromatic mercury lamp is about 8 A / mm 2
  • the lamp was lit at the current density, the lamp voltage V1a and the distance L between the electrodes were measured over the lighting time, and the rate of change from the value immediately after the start of lighting was determined.
  • the result is shown in Fig. 3. That is, in the case of a mercury-containing lamp, the rate of change of the lamp voltage V1a and the rate of change of the distance L between the electrodes increase only slightly with the elapse of the lighting time. However, in the case of mercury-free lamps, both increase significantly.
  • the slope is about 0.9, That is, the rate of change of the lamp voltage V 1 a and the rate of change of the inter-electrode distance L increase almost to the same extent.
  • the gradient is about 2
  • the rate of change of the lamp voltage V1a is larger than that of the distance L between the electrodes.
  • the lamp voltage increases sharply, and the life of the arc tube 1 decreases significantly due to blackening, while the current density decreases to 2 OA / mm 2 or less. More preferably, by setting it to 1 OA / mm 2 , the ramp voltage increase rate can be greatly suppressed, and a long lamp life can be obtained.
  • the tip temperature of the electrode is used as an index corresponding to the current density.
  • the higher the temperature of the electrode tip the more the evaporation of the electrode is promoted.
  • the ramp voltage rise rate is reduced and the lamp life is prolonged.
  • noise due to the spectrum unique to the metal can be removed, and the accuracy is extremely high. Measurement with high sensitivity can be simplified.
  • the luminance ratio R is calculated.
  • the electrode temperature T is calculated using the luminance ratio R.
  • Figure 5 shows the relationship between the electrode tip temperature obtained in this way and the current density. As can be seen from the figure, it corresponds to a current density of 2 OA / mm 2
  • the temperature at the tip of the electrode used is 320 K, and by keeping the temperature at or below this temperature, the lamp life can be extended. In order to start a stable discharge, it is preferable that the temperature be 250 K or more.
  • the current density can be reduced by making the electrode rod thicker. Specifically, for example, when the rated power is 35 W and the lamp voltage is 70 V, the lamp current is 0.5 A, so the electrode cross-sectional area is 0.025 mm 2 (circular shape). In the case of a cross section, the current density can be suppressed to 2 OA / mm 2 or less by making the diameter approximately ⁇ .18 mm) or more. However, if the thickness is too large, the withstand pressure of the arc tube decreases in inverse proportion to the electrode rod diameter. That is, the stress generated in the vicinity of the gap between the arc tube and the electrode rod becomes large.
  • the electrode rod may be damaged due to its mechanical strength. It is preferable to make it smaller. In order to shorten the rise time of the light beam at the start of lighting, it is preferable to reduce the diameter of the electrode rod.
  • the current density can be reduced by increasing the distance between the electrodes and increasing the lamp voltage. For example, increasing the pump voltage from about 4 mm to about 5 mm as in a conventional normal lamp can increase the pump voltage by about 25%. Therefore, it is easy to reduce the current density.
  • the size of the light source is limited. It is preferable not to make the distance between the electrodes too large.
  • the following describes an enclosure that can increase the lamp voltage by increasing the vapor pressure.
  • FIG. 6 is a cross-sectional view showing a mercury-free metal halide lamp according to Embodiment 3 of the present invention.
  • reference numeral 1 denotes an arc tube made of quartz, and 2 at both ends of the arc tube 1. It is a stop. 3 is a pair of electrodes made of tungsten, 4 is a molybdenum foil, and 5 is a lead wire made of the same molybdenum. The electrode 3 is electrically connected to one end of the molybdenum foil 4 sealed in the sealing portion 2, and a lead wire 5 is electrically connected to the other end of the molybdenum foil 4. Have been.
  • the tip of the electrode 3 in the arc tube 1 is arranged so that the distance between the tips, that is, the distance between the electrodes is about 4.2 (mm).
  • the inner volume of the arc tube 1 is about 0.025 (cc), and about 0.2 mg of + trivalent indium iodide Inl 3 (unit in the arc tube) About 8.0 mg / cc per volume) and about 0.19 mg of scandium iodide (about 8, O mg / cc per unit arc tube volume) and about 0.16 mg Of sodium iodide (about 6.4 mg / cc per unit arc tube volume), and about 0.7 MPa at room temperature, not shown in the figure. Xenon gas is sealed.
  • the feature of the large structure of the metal halide lamp according to the present embodiment is that it does not contain mercury, and that the indium that is further enclosed is indium.
  • the surprising thing about the mercury-free metal halide lamp of this embodiment, which contains the trivalent zinc iodide I n I 3, is that it is very mercury-free.
  • the lighting operation is performed at a very high lamp voltage.
  • the lamp voltage of the lamp of this embodiment is about 55 V
  • the lamp voltage is about 50 V.
  • the lamp shown in this embodiment in which +3 valent indium iodide Inl 3 is removed from the lamp described in this embodiment operates with a lamp power of 25 W to 50 W. Even so, a lamp voltage of only about 27 V can be obtained.
  • the current density can be easily reduced to 2 OA / mm 2 or less, and the lamp life can be reliably improved.
  • the I n I 3 and the like are set so that the lamp voltage becomes about 35.7 y or more. May be set.
  • about 0.2 mg of + trivalent indium iodide In I 3 (about 8.0 mg / cc per unit arc tube volume) is enclosed.
  • the mercury-free metal halide lamp was used as an example, as shown in Fig.
  • Figure 7 is the mercury-free main Taruharai Dora pump of this embodiment, + trivalent increase the amount of enclosed Yo U compound I n I 3 Lee indium, 3 5 W or is 4 5 W of run- when is lit operating at up power is a graph showing the relationship between the amount of enclosed ® ⁇ product I nl 3 of the lamp voltage and + 3-valent I Njiumu. The more + trivalent enclosed amount of I Nji ⁇ -time of Yo c monster I n I 3 is larger, run-up voltage is high Ku becomes Ri good.
  • FIG. 8 shows the relationship between the xenon gas charging pressure (converted to room temperature) and the total luminous flux of the mercury-free metal halide lamp of this embodiment, which was turned on with a lamp power of 45 W. This is a graph showing the amount of encapsulated indium iodide Inl 3 of the indium over a night.
  • the mercury-free metal halide lamp according to the present embodiment in which at least xenon gas and the iodide I n I 3 of the +3 valence alloy are sealed in the arc tube 1 is a xenon gas.
  • Increasing the gas filling pressure increases the total luminous flux almost without increasing the temperature of the hot spot, and increases the lamp voltage by increasing the iodide I n I 3 of the +3 valence alloy.
  • the sealing pressure of xenon gas will be described.
  • the upper limit of the sealing pressure of xenon gas is about 2.5 MPa (converted to room temperature). It is preferable to set to.
  • the mercury-free metal halide lamp of the present embodiment has a configuration in which the arc tube 1 is connected from the vicinity of the connection between the electrode 3 and the molybdenum foil 4 during the lighting operation. This is because the possibility of leakage of the internal airtightness increases, which is not preferable.
  • the upper limit of the more preferable xenon gas filling pressure is about 2.0MPa.
  • the lower limit is about 5 to 20 KPa, which makes it easy to start the lamp.
  • the lower limit is about 0.1 IMPa. Is more preferred. Then, the charging amount and the light flux of Yo U compound I n I 3 +3 valent Lee down di ium explain about.
  • +3 valent amount of enclosed Lee down di ium Yo U compound I n I 3 is better to be larger structure Ri good, high lamp voltage Ri yo is
  • + trivalent indium iodide I enclosed amount of nl 3 is about 9 0 Ri per unit arc tube volume. O mg / cc or is less than configured to this and is arbitrarily favored in the following points.
  • a halogen lamp which is currently widely used for automobile headlights, can obtain a total luminous flux of about 110 (lm) at a power consumption of 55 W.
  • Ramp pairs to the invention which is about 9 Ri units arc tube volume equivalent other inclusion of Yo U compound I n I 3 of Let's Ni + trivalent I Nji ⁇ beam shown in FIG. 9 0. O If the configuration is less than mg / cc, only 45 W of power will provide more luminous flux than conventional halogen bulbs, which is more economical.
  • Figure 9 shows the total luminous flux and the amount of +3 valent indium iodide I n I 3 in the mercury-free metal halide lamp of this embodiment, which was turned on with a lamp power of 45 W.
  • compound I nl to about 9 0 Ri filling amount is per arc tube volume of 3.
  • xenon gas filling pressure is 2.0MPa
  • a filling amount of less than / cc a luminous flux of about 110 (lm) or more can be obtained, which is more economical than a halogen bulb.
  • the graph shows the relationship between the amount of filled gas and the filled pressure (converted to room temperature) of xenon gas over time. + With less than about 50 mg / cc per unit volume of the arc tube, the amount of trivalent zinc iodide I n I 3 can be reduced to only 35 W. Power is more economical than conventional halogen bulbs, providing more luminous flux.
  • Xenon Bruno filling pressure of Ngasu is 2.
  • xenon gas of an appropriate pressure is sealed up to 2.5 MPa and the volume of the arc tube is reduced.
  • Ri about 9 0. if O mg / cc and an upper limit and to encapsulating Lee down di ium Yo U compound I nl 3 +3 valent appropriate amount constituting approximately 2 5 W or more lamp power
  • the lamp is turned on, the airtightness in the arc tube 1 is not broken, and a high lamp voltage is applied.
  • it is a mercury-free metal halide lamp that has a long service life and generates more luminous flux than a halogen bulb, and is most suitable as a so-called automotive headlight light source.
  • the mercury-free lamp of the present embodiment can obtain more luminous flux as the lamp is turned on with a larger lamp power.
  • the upper limit of the power consumption of the mercury-free lamp of the present embodiment is approximately 55 W in the usage range of a vehicle headlight. Lighting beyond the power consumption of conventional halogen bulbs is uneconomical and not preferred.
  • xenon gas of an appropriate pressure is sealed up to 2.5 MPa, and about 90 mg / cc per volume of the arc tube is filled.
  • an appropriate amount of +3 valent indium iodide I n I 3 is enclosed, and the lamp is lit with power between approximately 25 W and 55 W.
  • the light color of the mercury-free lamp of this embodiment is within the chromaticity range of the white light source specified by the HID light source for automobile headlights (JEL2115) of the Japan Light Bulb Manufacturers Association. It was confirmed.
  • the emission of the lamp can be reduced.
  • the chromaticity point is in the CIE 1 9 3 1 X y chromaticity diagram
  • the mercury of the present embodiment is limited by the above-described limited range of the sealing pressure of xenon gas, the amount of iodide I n I 3 of +3 valence indium, and the lamp power, as described above.
  • the metal halide lamp is fully usable as a vehicle headlight light source.
  • Embodiment 4 of the present invention will be described.
  • the structural configuration of this lamp is the same as that of the lamp of the third embodiment shown in FIG. 6 described above, except that the encapsulated nitrogen compound 7 and the enclosed xenon gas are not included.
  • the difference is that the pressure is about 1.4 MPa at room temperature.
  • the halogenated compound 7 contains about ⁇ .lmg of + trivalent indium iodide In I I 3 (about 4.0 mg / cc per unit arc tube volume) and about 0.1 mg.
  • the feature of the large configuration of the metal halide lamp of the present embodiment is that it does not contain mercury as in Embodiment 3 and is sealed.
  • the iodide of the enzyme is +3 valent indium iodide I n I 3 , it also contains thallium iodide. Is a point.
  • FIG. 11 shows the change in lamp voltage when the lamp is turned on at 35 W as in the third embodiment with the amount of thallium iodide (T1I) changed.
  • T1I thallium iodide
  • the addition of thallium iodide (T1I) dramatically increases the lamp voltage, and the higher the amount added, the higher the ramp voltage.
  • the lamp voltage is about 70 V when the lighting operation is performed with a lamp power of 35 W.
  • the lamp of the present embodiment can cause a substantial change over several hundred hours without blackening of the arc tube. It can be lit immediately.
  • FIG. 12 shows a change in the luminous flux when the lamp is lit at 35 W as in the third embodiment by changing the amount of thallium iodide (TII) sealed in the lamp.
  • TII thallium iodide
  • a large luminous flux can be obtained by adding thallium iodide T1I, and the amount of thallium iodide encapsulated must be increased. Further, the luminous flux increases.
  • the lamp voltage and the luminous flux increase as the Xe pressure increases.
  • the filling pressure of xenon gas is not more than 2.5 MPa, more preferably not more than 2. OMPa, and not less than about 5 to 20 KPa. More preferably, it is more than 0 .IMPa, which is desirable in terms of maintaining airtightness and easy starting.
  • at least xenon gas and +3 valence As described above, the mercury-free metal halide lamp of this embodiment in which the indium iodide InI3 of indium and titanium iodide are sealed in the arc tube 1 has the above-described properties.
  • the lamp voltage and the total luminous flux increase when the evening beam is increased, and the lamp voltage and the total luminous flux also increase when the xenon gas filling pressure is increased. This effect also depends on the lamp power, the distance between the electrodes, the inner volume of the arc tube 1, the amount of scandium iodide, the amount of sodium iodide, or the amount of iodide. Obtained irrespective of other components such as the type and amount of other halides enclosed with the evening room.
  • xenon gas of an appropriate pressure is sealed up to 2.5 MPa, and + trivalent indium iodide is used.
  • a configuration in which a certain indium iodide and thorium iodide are encapsulated provides a high lamp voltage, has a long life, and generates more luminous flux than a halogen bulb.
  • the lamp power as in the third embodiment, the more the lamp is turned on with a large lamp power, the more luminous flux is obtained.
  • the upper limit of the power consumption of the mercury-free lamp of the present embodiment is approximately 55 W in the usage range of the vehicle headlight. Lighting beyond the power consumption of conventional halogen bulbs is uneconomical and not preferred.
  • the mercury-free metal halide lamp of the present embodiment is filled with xenon gas at an appropriate pressure up to 2.5 MPa. and construction encapsulating arc tube volume per Ri about 9 0. ® ⁇ product I n I 3 and Yo Ukata re um of O mg / cc limit and to appropriate amount of + 3-valent Lee indium
  • the light color of the mercury-free lamp of the present embodiment is an automobile headlight conforming to the Japan Light Bulb Manufacturers Association standard. It was confirmed that it was within the chromaticity range of the white light source specified by the HID light source (JEL215) for the camera.
  • the charging pressure of xenon gas in a limited range as described above and the The mercury-free metal halide lamp according to the present embodiment can be completely used as a light source for a vehicle headlamp in terms of the amount of iodide I n I 3 charged and the lamp power.
  • a mercury-free lamp in which thallium iodide is encapsulated has been described as an example.
  • thallium bromide (T1Br) may be used. It may be Li (T 1 C 1). Further, the T1 metal and the halogen may be separately sealed.
  • +3 Lee down di ium Yo U compound I nl 3 is + monovalent Lee emissions Jiu divided into arm Yo U compound I n I and iodine I 2 is enclosed in the arc tube 1 It doesn't matter.
  • a lamp composed of scandium iodide and sodium iodide was described as an example, but scandium iodide and sodium iodide were It may be composed of other metal halides.
  • the scandium iodide may be scandium bromide
  • the sodium iodide may be sodium bromide.
  • scandium and sodium may be other metals, such as, for example, thallium iodide or bromide.
  • the encapsulation amount is not limited to the amount shown in the lamp of the present embodiment.
  • the constituent elements other than the halogenated compound and xenon gas of the high-valent alloy are merely examples, and for example, the distance between the electrodes may be other than 4.2 mm, and the inner volume of the arc tube 1 may be different. Is not limited to 0.025 cc.
  • xenon gas of about 0.7 MPa or 1.4 MPa at room temperature was sealed in the arc tube 1 to assist starting, but it was used for automobile headlights.
  • the rare gas is preferably xenon gas only, and the rare gas may be a rare gas other than xenon gas, for example, argon gas, and its filling pressure is about 0.7 at room temperature. It is not limited to MPa.
  • the mercury-free metal halide lamp of FIG. 1 is held in an outer tube 8.
  • the outer surface of the outer tube 8 has an infrared reflective film 9 are coated.
  • the heat retention becomes higher.-The vapor pressure of the metal halide is easily increased, and the lamp voltage can be easily increased. Therefore, the current density can be kept low, and the lamp life can be easily extended.
  • the infrared reflection film 9 for example, a film obtained by multilayer coating of a TaO x film and a Si x film by a thermal CVD method and a sputtering method can be used.
  • the number of coating layers may be determined based on the tact time in manufacturing, the balance between manufacturing cost and lamp performance, and the like.
  • the effect of increasing the vapor pressure of the metal halide is remarkably obtained.
  • the infrared reflecting film 9 may be coated not only on the outer surface of the outer tube 8 but also on the inner surface.
  • the particularly preferred examples of the present invention have been described in the above embodiments. However, it is needless to say that the description is not limited and can be variously modified.
  • the metal halide lamp of the present invention described in the present embodiment is an exemplification, and the scope of the present invention is determined by the appended claims.
  • INDUSTRIAL APPLICABILITY As described above, according to the present invention, by setting the current density or the electrode tip temperature to a predetermined value or less, the evaporation of the electrode with the elapse of the lighting time is achieved. Thus, the lamp voltage can be increased and the arc tube 1 can be prevented from being blackened, and a long lamp life can be obtained. Therefore, the present invention is useful in fields such as general lighting and automobile headlights.

Landscapes

  • Discharge Lamp (AREA)
  • Discharge Lamps And Accessories Thereof (AREA)

Abstract

Une ampoule (1) comprend une paire d'électrodes (3) et I/S est inférieur à 20 A/mm2, S étant la section du point des électrodes (3) et I le courant qui circule entre les électrodes (3) à la puissance nominale pour l'ampoule. Ainsi, on empêche l'ampoule (1) de noircir ou à la tension de la lampe d'augmenter, consécutivement à l'évaporation des électrodes dans le temps, et on prolonge sa durée de vie.
PCT/JP1999/004969 1979-11-06 1999-09-10 Lampe a l'halogenure d'argent anhydre WO2000016360A1 (fr)

Priority Applications (3)

Application Number Priority Date Filing Date Title
KR1020007004945A KR20010024584A (ko) 1998-09-16 1999-09-10 무수은 메탈할라이드램프
US09/554,409 US6653801B1 (en) 1979-11-06 1999-09-10 Mercury-free metal-halide lamp
EP99943295A EP1032010A4 (fr) 1998-09-16 1999-09-10 Lampe a l'halogenure d'argent anhydre

Applications Claiming Priority (6)

Application Number Priority Date Filing Date Title
JP10/261155 1998-09-16
JP26115598 1998-09-16
JP11/064732 1999-03-11
JP6473299 1999-03-11
JP11/216830 1999-07-30
JP21683099 1999-07-30

Publications (1)

Publication Number Publication Date
WO2000016360A1 true WO2000016360A1 (fr) 2000-03-23

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PCT/JP1999/004969 WO2000016360A1 (fr) 1979-11-06 1999-09-10 Lampe a l'halogenure d'argent anhydre

Country Status (5)

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EP (1) EP1032010A4 (fr)
KR (1) KR20010024584A (fr)
CN (1) CN1277732A (fr)
TW (1) TW429390B (fr)
WO (1) WO2000016360A1 (fr)

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EP1158567A2 (fr) * 2000-05-26 2001-11-28 Matsushita Electric Industrial Co., Ltd. Dispositif de service pour une lampe à décharge à haute intensité exempte de mercure et lampe aux halogènures métalliques sans mercure

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KR20010006751A (ko) * 1999-03-11 2001-01-26 모리시타 요이찌 무수은 메탈핼라이드 램프
US7242144B2 (en) 2001-09-27 2007-07-10 Harison Toshiba Lighting Corp. High-pressure discharge lamp, high-pressure discharge lamp lighting device and automotive headlamp apparatus
DE10204691C1 (de) * 2002-02-06 2003-04-24 Philips Corp Intellectual Pty Quecksilberfreie Hochdruckgasentladungslampe und Beleuchtungseinheit mit einer solchen Hochdruckgasentladungslampe
JP2003242933A (ja) 2002-02-15 2003-08-29 Toshiba Lighting & Technology Corp メタルハライドランプおよび自動車用前照灯装置
JP4037142B2 (ja) * 2002-03-27 2008-01-23 東芝ライテック株式会社 メタルハライドランプおよび自動車用前照灯装置
DE10237598A1 (de) * 2002-08-16 2004-02-26 Philips Intellectual Property & Standards Gmbh Erhöhung der Lichtbogendiffusität bei quecksilberfreien Gasentladungslampen
US7633228B2 (en) * 2005-11-30 2009-12-15 General Electric Company Mercury-free metal halide discharge lamp
KR101032078B1 (ko) * 2008-02-12 2011-05-02 가부시키가이샤 고이토 세이사꾸쇼 방전 램프 장치용 무수은 아크 튜브
JP6086253B2 (ja) * 2014-08-28 2017-03-01 ウシオ電機株式会社 ロングアーク型放電ランプ

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Publication number Priority date Publication date Assignee Title
EP1158567A2 (fr) * 2000-05-26 2001-11-28 Matsushita Electric Industrial Co., Ltd. Dispositif de service pour une lampe à décharge à haute intensité exempte de mercure et lampe aux halogènures métalliques sans mercure
EP1158567A3 (fr) * 2000-05-26 2002-01-16 Matsushita Electric Industrial Co., Ltd. Dispositif de service pour une lampe à décharge à haute intensité exempte de mercure et lampe aux halogènures métalliques sans mercure
US6608444B2 (en) 2000-05-26 2003-08-19 Matsushita Electric Industrial Co., Ltd. Mercury-free high-intensity discharge lamp operating apparatus and mercury-free metal halide lamp

Also Published As

Publication number Publication date
CN1277732A (zh) 2000-12-20
EP1032010A1 (fr) 2000-08-30
TW429390B (en) 2001-04-11
EP1032010A4 (fr) 2001-11-28
KR20010024584A (ko) 2001-03-26

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