Illumination apparatus

Details Illumination apparatus Illumination apparatus

1987-06-15

1989-01-10

Moore, David K.

Electric lamp and discharge devices: systems

With electromagnetic wave radiation preventing or shielding...

315115, 315117, 315248, 315174, 313 13, 313 15, 313239, 355 69, H01J 6509, H05B 680

Patent

active

047975989

ABSTRACT:
An illumination apparatus includes a discharge tube for emitting light upon an application of an external high frequency wave electromagnetic field, an electrode, arranged outside the discharge tube, for applying the high frequency wave electromagnetic field to the discharge tube, a high frequency wave applying unit for supplying high frequency wave power to the electrode, and a projected portion extending from the discharge tube. The projected portion extends to a position where the high frequency wave electromagnetic field generated by the electrode has a level lower than a discharge initiation level. The high frequency wave power is controlled by changing a voltage, a frequency, a duty ratio or the like.

REFERENCES:
patent: 2267821 (1941-12-01), Elenbaas
patent: 2975330 (1961-03-01), Bloom et al.
patent: 3323010 (1967-05-01), Bisjak et al.
patent: 3331977 (1967-07-01), Wainio
patent: 3807856 (1974-04-01), Rodriquez
patent: 4431947 (1984-02-01), Ferris
patent: 4451765 (1984-05-01), Gray
patent: 4533853 (1985-08-01), Hammond et al.
patent: 4533854 (1985-08-01), Northrup

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