Ultrahigh pressure mercury lamp with an anode configured to...

Details Ultrahigh pressure mercury lamp with an anode configured to... Ultrahigh pressure mercury lamp with an anode configured to...

2005-05-03

2005-05-03

Patel, Nimeshkumar D. (Department: 2879)

Electric lamp and discharge devices

With gas or vapor

Having particular electrode structure

C313S634000, C313S637000, C313S639000, C313S621000, C313S623000, C313S642000, C362S216000, C362S217060

Reexamination Certificate

active

06888311

ABSTRACT:
An ultrahigh pressure mercury lamp which is small and has high light radiation intensity and moreover good color reproduction with high efficiency in which, even with a large amount of mercury added, a failure of the mercury to vaporize in the bulb part does not occur, and in which blackening of the bulb part due to wearing of the electrodes even under a large electrode load as a result of shortening of the distance between the electrodes is low is obtained by an ultrahigh pressure mercury lamp in which a bulb part of the discharge vessel made of translucent material has an essentially ovoid shape, is filled with at least 0.2 mg/mm3of mercury and which is operated at an input wattage of at most 400 W using direct current, has the length D of the tip area of the anode and the length L of the bulb part in the direction of the tube axis of the lamp set in accordance with the relationship D≧L/2.

REFERENCES:
patent: 4439711 (1984-03-01), Murakami et al.
patent: 5109181 (1992-04-01), Fischer et al.
patent: 5497049 (1996-03-01), Fischer
patent: 5663607 (1997-09-01), Kira et al.
patent: 6274983 (2001-08-01), Ooyama et al.
patent: 6294870 (2001-09-01), Kawashima et al.
patent: 6661176 (2003-12-01), Honda et al.
patent: 6667575 (2003-12-01), Nishida
patent: 11-111226 (1999-04-01), None
patent: 2001-319618 (2001-11-01), None

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