Looped frame arc tube mounting assembly for metal halide lamp

A technology for metal halide lamps and mounting components, which is applied in the field of component lamps and arc tube mounting components, can solve problems such as rising wall temperature, catastrophic failure of discharge vessels, and shortened lamp life, so as to prolong life and improve lumen maintenance. Effect

Inactive Publication Date: 2008-11-19
KONINKLIJKE PHILIPS ELECTRONICS NV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

This arc bending moves the arc closer to the side walls of the arc discharge vessel, which increases ...

Method used

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  • Looped frame arc tube mounting assembly for metal halide lamp
  • Looped frame arc tube mounting assembly for metal halide lamp
  • Looped frame arc tube mounting assembly for metal halide lamp

Examples

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Embodiment Construction

[0034] The figures are diagrammatic and not drawn to scale. The same reference numerals refer to the same components in different figures.

[0035] see now figure 1 , which shows a front view of one embodiment of a ceramic metal halide lamp 10 of the present invention, shown in partial cutaway, having a tubular outer shell 11, typically made of fused silica, the tubular outer shell Body 11 has sealed top 12 and bottom 13 ends, and a pinch seal 14 . A ceramic base 15 is attached to the bottom end 13 of the outer shell 11 .

[0036] An arc tube installation assembly 1 is arranged inside the outer shell 11, the arc tube installation assembly 1 includes a sealed ceramic arc tube 2, the ceramic arc tube 2 is generally made of polycrystalline alumina (PCA), and the ceramic arc tube 2 seals the discharge space 3 , the discharge space 3 has a filling, usually mercury and a rare gas such as argon, which can support the arc discharge. Extending from the bottom end 2B and top end 2C ...

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PUM

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Abstract

An arc tube mounting assembly (1) for a metal halide arc lamp (10) includes frame members (8, 9) for supporting an arc tube (2). The arc tube (2) is supported from above by a looped frame member (8) having a loop (8A) which extends along opposing sides, and across top and base ends (2A, 2B) of the arc tube (2), thus evenly distributing the current to discharge electrode 7, thereby cancelling magnetic forces which could displace the arc from the center of the arc tube (2), resulting in improved lumen maintenance and extended life. A centering circle (8B) of the frame member (8) wraps around the lower ceramic end plug (4), providing coaxial alignment of the arc tube (2) and the tubular outer envelope (11).

Description

technical field [0001] This invention relates to metal halide arc lamps, and in particular to an improved arc tube mounting assembly for a compact metal halide lamp, and to a lamp incorporating such an improved assembly. Background technique [0002] Metal halide arc lamps are known to be susceptible to arc bending caused by asymmetrical magnetic forces induced by current carrying support members. This arc bending moves the arc closer to the side walls of the arc discharge vessel, which increases the wall temperature and leads to a shortened lamp life or even catastrophic failure of the discharge vessel. [0003] US Patent Application Publication No. 2003 / 0062831 provides a special frame wire structure for arc stabilization of ceramic high intensity discharge (HID) lamps. In one embodiment, two identical frame wires run parallel to each other along opposite sides of the arc tube and at equal distances from the arc tube. These wires share the current load to the discharge e...

Claims

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Application Information

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IPC IPC(8): H01J61/36
CPCH01J5/48
Inventor J·伍德斯J·拜利J·卡伯恩
Owner KONINKLIJKE PHILIPS ELECTRONICS NV
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