Extra-high pressure discharge lamp

Abstract

The invention provides a super-high voltage discharge lamp which has no rupture and bent (deformed) electrodes and has expected performances. The super-high voltage discharge lamp is provided with a luminotron comprising a luminescent part and a sealed part. The luminescent part is internally disposed with a pair of electrodes opposite to each other and filled with 0.15mg / mm<3> of mercury. The sealed part is connected with two ends of the luminescent part respectively and extends along a tube axle. Each electrode has an electrode axial part extending along the tube axle. The base end part of the electrode axial part is connected with a metal foil extending along the tube axle to be hermetically embedded in the sealed part. The super-high voltage discharge lamp is characterized in that a part (is in a range of from the sealed part to a boundary part of the luminescent part and is corresponding to a part with minimal inner diameter of the luminescent part) of the electrode axial part of at least one electrode has a trapezoidal part which is towards axial outside and the outer diameter of which becomes bigger.

Description

technical field [0001] The present invention relates to an ultra-high pressure discharge lamp used in a projection device such as a DLP (Digital Light Processing: registered trademark) using a liquid crystal display device or a DMD (Digital Micromirror Chip: registered trademark), especially It involves sealing 0.15mg / mm in the luminous tube 3 The ultra-high pressure discharge lamp is formed by the above mercury, and the mercury pressure reaches 150 atmosphere or more when the lamp is lit. Background technique [0002] Conventionally, in projection-type projection devices represented by DLP such as liquid crystal projectors or DMDs, metal halide lamps sealed with mercury or metal halides in luminescent tubes have been used as light sources to illuminate rectangular screens uniformly and with sufficient colors. Images are therefore widely used. [0003] In recent years, since the light sources used in such projection devices have been required to be more compact and point l...

AI Technical Summary

Problems solved by technology

[0012] However, in the above-mentioned existing ultra-high pressure discharge lamp, in the process of repeated lighting and extinguishing, in the boundary part between the sealing part and the light emitting part, the electrode may be bent so that the electrode is relatively large. The problem of broken electrodes

[0013] Moreover, in the smallest inner diameter portion of the arc tube in the boundary portion from the sealing portion to the light emitting portion, there may be a problem that the ultra-high pressure discharge lamp itself is broken due to cracks.

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