High-pressure discharge lamp

Details High-pressure discharge lamp High-pressure discharge lamp

2006-07-11

2006-07-11

Wong, Don (Department: 2821)

Electric lamp and discharge devices

With luminescent solid or liquid material

Solid-state type

C313S234000, C313S238000

Reexamination Certificate

active

07075232

ABSTRACT:
A high pressure discharge lamp according to the present invention is a high pressure discharge lamp in which the top ends of a pair of electrodes opposed in a discharge vessel2of an arc tube1are formed each into a substantially semispherical shape and a protrusion10to form an arc spot is formed at each top end, wherein all of the relation: 0.3••L/I••1.0 for an inter-electrode distance L(mm) between the electrodes and a lamp current I(A) during stable lighting, the relation: 1.2••10−7••X/Y••1.1••10−5for a molar amount X(mol) of bromine in the bromide sealed in the discharge vessel2and an inner volume Y(ml) of the discharge vessel2,and the relation: 9••W3/2/I••65, for a weight W(mg) of tungsten at the top end of each electrode3formed into a substantially semispherical shape are satisfied, and the lighting frequency of a rectangular wave during stable lighting is 45 Hz or higher.

REFERENCES:
patent: 3911308 (1975-10-01), Akutsu et al.
patent: 4232243 (1980-11-01), Rigden
patent: 4929863 (1990-05-01), Verbeek et al.
patent: 5905341 (1999-05-01), Ikeuchi et al.
patent: 6060830 (2000-05-01), Sugitani et al.
patent: 2001/0038267 (2001-11-01), Ono et al.
patent: 2001-312997 (2001-11-01), None
patent: 2001-325918 (2001-11-01), None
patent: 2002-83538 (2002-03-01), None
English language Abstract of JP 2001-312997.
English language Abstract of JP 2001-325918.
English language Abstract of JP 2002-83538.

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