Discharge lamp-lighting apparatus for straightening arc discharg

Details Discharge lamp-lighting apparatus for straightening arc discharg Discharge lamp-lighting apparatus for straightening arc discharg

1995-11-20

1998-06-30

Pascal, Robert

Electric lamp and discharge devices: systems

Pulsating or a.c. supply

315209R, 313637, H05B 4116

Patent

active

057739374

ABSTRACT:
An apparatus that obtains a straight discharge arc during the whole lighting period, as well as provides a discharge lamp-lighting apparatus which can form a plurality of luminous intensity distribution patterns by changing the shape of the discharge arc. By supplying a lighting waveform equal to an acoustic resonance frequency which lighting waveform excites the mode to make the discharge arc straight. The acoustic resonance frequency is determined by the sound velocity in the discharge space medium and the height of a section orthogonal area to the electrode axis to the discharge lamp. The shape of the discharge arc at the time of rated lighting can be made substantially straight. By supplying the lighting waveform which amplifies the amplitude of the compressional wave emitted from the discharge arc during the period when the vapor pressure of the filler of the discharge lamp is low, the shape of the discharge arc can be made straight during the whole lighting period. By changing the ratio of the acoustic resonance frequency component, the shape of the discharge arc can be changed.

REFERENCES:
patent: 4983889 (1991-01-01), Roberts
patent: 5121034 (1992-06-01), Allen et al.
patent: 5436533 (1995-07-01), Fromm et al.

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