High pressure double wall sodium arc tube and methods of operati

Details High pressure double wall sodium arc tube and methods of operati High pressure double wall sodium arc tube and methods of operati

1987-04-03

1989-06-13

Boudreau, Leo H.

Electric lamp and discharge devices: systems

Periodic switch in the supply circuit

Silicon controlled rectifier ignition

315220, 315227R, 313 24, 313 26, 313 27, 31323101, H05B 3702

Patent

active

048395650

ABSTRACT:
A high intensity discharge metal vapor lamp comprising an arc tube having an inner chamber vented to the arc tube and disposed therein is disclosed. The combination of the arc tube and inner chamber being of a double wall construction confines the arc condition occurring between thermionic electrodes to be within the inner chamber. The inner chamber is operated at an increased wall temperature, relative to a conventional arc tube, while at the same time reducing the typically experienced sodium losses that normally occur for increased wall temperature operation. Ceramic evaporation at elevated temperatures from the inner chamber can be rendered innocuous by deposition on a similar material utilized in the arc tube. The characteristics of the arc tube allows for improved methods of its operation such as a pulsed operation at a relatively high rate of 1 to 20 KHz so as to achieve a relatively high color temperature. If desired, the arc tube may be operated in a d.c. mode while at the same time reducing the tendancy of separation between the sodium and mercury fill contained with the arc tube typically occurring for such d.c. operation.

REFERENCES:
patent: 2116720 (1938-05-01), Wiegand
patent: 2269819 (1942-01-01), Isenberg
patent: 3248590 (1966-04-01), Schmidt
patent: 4065691 (1977-12-01), McVey
patent: 4137484 (1979-01-01), Osteen
patent: 4490642 (1984-12-01), Dobrusskin et al.
patent: 4506369 (1985-03-01), Houston
patent: 4567396 (1986-01-01), McVey

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