Metal halide lamp and lighting device using same

A metal halide lamp, metal halide technology, applied in the direction of lighting devices, fixed lighting devices, lighting and heating equipment, etc., can solve the problems of color rendering loss, reduce vapor pressure, etc., and achieve the effect of preventing color rendering

Inactive Publication Date: 2006-07-12
PANASONIC CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this is also not a practical approach as it reduces the vapor pressure of each luminescent material during lamp illumination, which would compromise the desired color rendering

Method used

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  • Metal halide lamp and lighting device using same
  • Metal halide lamp and lighting device using same
  • Metal halide lamp and lighting device using same

Examples

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Embodiment Construction

[0028] The best mode for carrying out the present invention will be described below with reference to the accompanying drawings.

[0029] figure 1 A dimmable metal halide lamp 1 according to an embodiment of the invention is shown. Such as figure 1 As shown, the metal halide lamp 1 includes: an outer tube 3 (for example, made of hard glass), one end of which is closed and substantially hemispherical, and the other end is sealed by a tube base 2; a lamp base 4 (for example, an E-type lamp base) connected to To one end of the outer tube 3 sealed by the base 2; the arc tube 5 is arranged inside the outer tube 3; the sleeve 6 made of quartz glass is in a tubular shape. The sleeve 6 is inserted between the outer tube 3 and the arc tube 5, thereby preventing the outer tube 3 from breaking when the arc tube 5 breaks.

[0030] The metal halide lamp 1 has a standard rated power of 150 W (ie maximum lamp power) and a minimum lamp power of 90 W is used in the case of dimming control. ...

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PUM

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Abstract

Provided is a metal halide lamp capable of being dimmed, which is prevented from non-lighting due to leakage of an arc tube attributable to a crack occurring at thin tubes, as well as realizing a desired color characteristic. The metal halide lamp has an arc tube that includes an envelope made of translucent ceramic, a pair of electrodes, and metal halides, the metal halides including rare earth metal halide, sodium halide, and magnesium halide, the rare earth metal halide being at least one of dysprosium halide, thulium halide, holmium halide, cerium halide, and praseodymium halide, and the magnesium halide being at least one of magnesium iodide and magnesium bromide, where when a maximum lamp power P (W) is in a range of 70 W to 250 W, the following relations are satisfied: <?in-line-formulae description="In-line Formulae" end="lead"?>0.0345A+0.0028B<0.0015P+0.0475;<?in-line-formulae description="In-line Formulae" end="tail"?> <?in-line-formulae description="In-line Formulae" end="lead"?>A>=0.021P+0.313; and<?in-line-formulae description="In-line Formulae" end="tail"?> <?in-line-formulae description="In-line Formulae" end="lead"?>B>=10.0,<?in-line-formulae description="In-line Formulae" end="tail"?> where A (mg) represents a total content of the metal halides, and B (mol %) represents a content ratio of the magnesium halide to the metal halides.

Description

technical field [0001] The invention relates to a metal halide lamp and an illuminating device using the metal halide lamp. In particular, the present invention relates to techniques for obtaining desired color rendering and preventing cracking of narrow tubes in dimmable ceramic metal halide lamps. Background technique [0002] Recently, from the viewpoint of energy saving, metal halide lamps capable of being dimmed are required. Specifically, it is the kind of lamp that can normally illuminate under high lamp power (rated power), and has the function of illuminating under lower lamp power when so much light is not needed. [0003] In metal halide lamps whose envelopes are made of transparent ceramics (hereinafter referred to as "ceramic metal halide lamps"), various types of rare earth metal halides such as dysprosium halide, thulium halide, holmium halide, halide Cerium and Praseodymium Halides. The envelope is composed of a main pipe in which a pair of electrodes are ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01J61/12H01J61/06H01J61/00F21S8/02F21Y101/00H01J61/20H01J61/88
CPCH01J61/125H01J61/827
Inventor 太田勋武田一男阪本和重
Owner PANASONIC CORP
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