High pressure discharge lamp and method for sealing a bulb...

Details High pressure discharge lamp and method for sealing a bulb... High pressure discharge lamp and method for sealing a bulb...

2006-05-02

2006-05-02

Patel, Ashok (Department: 2879)

Electric lamp and discharge devices

With gas or vapor

Having a particular total or partial pressure

C313S630000, C313S631000, C313S633000

Reexamination Certificate

active

07038379

ABSTRACT:
A high pressure discharge lamp includes a quartz glass bulb, a conductive element which is sealed at a sealing portion of the bulb, and a pair of electrodes. Each electrode is disposed in the quartz glass bulb so as to be opposite the other and connected to the conductive element. A part of each electrode is sealed with the quartz glass bulb at the sealing portion so as to generate a contacting portion formed by the part of each electrode and the bulb. The maximum length, Lmax, of the contacting portion is defined as: Lmax(mm)≦200/(P×D); and the minimum length, Lmin, of the contacting portion is defined as: Lmin(mm)≧0.8/(D2×π) or Lmin(mm)≧0.7 whichever is longer, where D is the diameter (mm) of the electrode and P is the power (W) supplied to the electrode.

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