Metal halide lamp, lighting device for metal halide lamp and headlight
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A technology for metal halide lamps and headlights, applied in lighting devices, fixed lighting devices, discharge lamps, etc., can solve the problems of slow evaporation of metal halides and inability to obtain high vapor pressure of mercury
Inactive Publication Date: 2007-06-06
HARISON TOSHIBA LIGHTING CORP +1
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However, in mercury-free lamps, since mercury luminescence cannot be obtained, and the high vapor pressure of mercury immediately after lighting cannot be obtained, the evaporation of metal halides is slow, so it is generally difficult to satisfy the above conditions.
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Embodiment 1
[0076] Light-transmitting airtight container 1: the inner volume of the inner space is 0.020cc, and the distance D2.3mm
[0080] Discharge medium: metal halide ScI 3 -NaI-ZnI 2 -InI-CsI,
[0081] Total 0.5mg, rare gas Xe10atm
[0082] Input power immediately after starting: 85W
[0083] Input current immediately after starting: 2.8A
[0084] Lamp voltage when stable: 42V
[0085] Steady lamp current: 0.8A
[0086] Steady lamp power: 35W
[0087] Luminous flux when starting for 4 seconds: 1370lm
[0088] [Comparative example]
[0089] Light-transmitting airtight container 1: the internal volume of the internal space is 0.020cc, the inner diameter is 2.6mm, and the surrounding part
[0090] Length 7.0mm, outer diameter of surrounding part 6.0mm
[0091] ...
Embodiment 2
[0120] Metal covering body SC: constituted by a coil body as an example.
[0121] The diameter of the coil is 0.07mm, the pitch of the coil is 100%, the length of the electrode axis direction is 5.5mm, and the length of the electrode axis direction on the sealing metal foil 2 is 1.5mm
[0122] The diameter of the shaft portion of the electrode 1b is 0.3 mm in the sealing portion and 0.38 mm in the discharge space.
[0123] Light-transmitting airtight container 1: The inner diameter of the surrounding portion 1a is 2.6 mm, the outer diameter is 6.0 mm, and the maximum length in the longitudinal direction is 6.6 mm.
[0124] Discharge medium: the metal halide is scandium iodide-sodium iodide-zinc iodide 0.5mg, the rare gas is xenon about 11 atmospheres, and it does not contain mercury at all.
[0125] Fig. 6 shows the length L in the second embodiment of the present invention E (mm) graph versus chromaticity change. This graph is obtained by changing the length of the metal cov...
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Abstract
There are provided a mercury-free metal halide lamp which is improved in light flux rising immediately after starting, more practical and suitable for a headlight, and a metal halide lamp lighting device and a headlight using this. The metal halide lamp according to the present invention comprises: a translucent air-tight container having an inner volume which is not greater than 0.1 cc, including an enclosure portion forming an inner space having a flat surface on a bottom surface, and having a ratio D / L satisfying the following expression: 0.29<= D / L<= 0.43 where D is a distance between the bottom surface and a top surface of the inner space at a central portion in a tube-axis direction, and L is a length of the enclosure portion; a pair of electrodes sealed facing each other with an inter-electrode distance which is not greater than 5 mm; and a discharging medium containing a plurality of metal halogen compounds selected from a group of Sc, Na, In, Zn and a rare-earth metal and a rare gas but intrinsically not containing mercury (Hg), wherein a lamp power per unit inner surface area of the air-tight container is not smaller than 60 (W / cm 2 ).
Description
technical field [0001] The present invention relates to a mercury-free metal halide lamp, a lighting device for a metal halide lamp using the same, and a headlamp. Background technique [0002] There is known a so-called mercury-free metal halide lamp (hereinafter referred to as "mercury-free lamp" for brevity) in which mercury is not substantially enclosed (for example, refer to Patent Document 1). Mercury-free lamps are generally filled with halides of metals such as zinc (Zn) which have a relatively high vapor pressure and are difficult to emit light in the visible region, instead of the conventional mercury enclosed as a buffer substance for forming the lamp voltage. [0003] Mercury-free lamps are expected to be developed as metal halide lamps for headlights of automobiles that are intended to completely eliminate environmental loads. Such a metal halide lamp is required to generate a luminous flux of 80% of the rated luminous flux after 4 seconds of rising the luminou...
Claims
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