Electric lamp and discharge devices – With gas or vapor – Envelope with particular structure
Patent
1994-05-11
1995-05-16
O'Shea, Sandra L.
Electric lamp and discharge devices
With gas or vapor
Envelope with particular structure
313642, 313641, H01J 6130
Patent
active
054163838
ABSTRACT:
To reduce the noise level of operation of a high-pressure metal halide diarge lamp, the lamp has a rotation-symmetrical discharge vessel (2) which has an inner surface which has a central region which is circular cylindrical and two facing transition regions (12, 13) which are straight-sided right-circular-conical and connect the central circular cylindrical region to extending shaft portions (3, 4) into which the electrodes and connecting foils are sealed. A lamp of this type, when operated from a square-wave power supply has a reduced noise level, particularly in the audio frequency range of between 6 to 20 kHz. A suitable angle between the circular cylindrical portion and the right-conical portion is between 120.degree. and 160.degree., for example about 145.degree..
REFERENCES:
patent: 3590307 (1971-06-01), Dobrusskin
patent: 3654506 (1972-04-01), Kuhl et al.
patent: 4647814 (1987-03-01), Dobrusskin et al.
patent: 4724361 (1988-02-01), Wada et al.
patent: 4972119 (1990-11-01), Kariya et al.
Esserman Matthew J.
O'Shea Sandra L.
Patent-Treuhand Gesellschaft Fuer Elektrische Gleuhlampen mbH
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