Lighting device for fluorescent discharge tube

Details Lighting device for fluorescent discharge tube Lighting device for fluorescent discharge tube

1990-03-20

1991-11-26

Pascal, Robert J.

Electric lamp and discharge devices: systems

Periodic switch in the supply circuit

Periodic switch cut-out

315307, 315323, 315DIG5, 315DIG7, H05B 3702

Patent

active

050685740

ABSTRACT:
In this invention, pulse generating means is adapted to emit a high-frequency pulse signal of a fixed duty ratio and a discharge tube is lighted by means of this pulse signal. The frequency of the pusle emitted by the pulse generating means is adjustable by adjusting means. Thus, one discharge tube lighting device of this invention can be used interchangeably for lighting discharge tubes varying in capacity. The lighting device is further capable of effecting adjustment of light in a wide range. Further, sequential potential forming means is adapted to allow a plurality of discharge tubes to be sequentially lighted with intervals. When a plurality of discharge tubes are to be lighted, therefore, the rectifying means necessary for the lighting is allowed to have only a small capacity. The high-voltage applying means for applying high voltage to the discharge tubes are connected to the electrodes disposed at the opposite terminals of the discharge tubes with connecting wires joined one each to the electrodes. At the time that the discharge tubes are to be started, the electrodes are not required to be preheated. The discharge tubes, therefore, can be lighted even when the ambient temperature is very low.

REFERENCES:
patent: 4137484 (1979-01-01), Osteen
patent: 4663570 (1987-05-01), Luchaco et al.
patent: 4749914 (1988-06-01), Feher et al.
patent: 4999546 (1991-03-01), Koda et al.

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