Electric lamp and discharge devices – With temperature modifier – Double wall – jacket or casing for envelope
Patent
1988-12-13
1991-03-05
Yusko, Donald J.
Electric lamp and discharge devices
With temperature modifier
Double wall, jacket or casing for envelope
313621, 313623, 313631, H01J 6104
Patent
active
049980360
ABSTRACT:
A single end-sealed type metal vapor discharge lamp includes an arc tube having a bulb made up of a discharge portion defining a discharge region and a sealing portion with a shoulder portion situated adjacent to the discharge portion. A pair of electrodes have a pair of mutually opposite electrode portions on an upper end of each of the pair, the electrodes extending from the sealing portion toward the discharge region. An outer tube encloses the arc tube in which a cross-sectional configuration of the bulb has a point of inflection at a boundary between the discharge portion and the sealing portion. A straight line l connecting a center of one electrode portion to that of the other electrode potion makes an angle of 15.degree.-45.degree. with respect to a straight line L connecting the point of inflection to a midpoint of the straight line l. The shoulder portion is located at a side opposite to that, on which the straight line l exists with the straight line L as a reference.
REFERENCES:
patent: 4612000 (1986-09-01), English et al.
patent: 4633136 (1986-12-01), Fromm et al.
patent: 4717852 (1988-01-01), Dobrusskin et al.
patent: 4739220 (1988-04-01), Dobrusskia et al.
patent: 4766348 (1988-08-01), English et al.
Honda Kazuo
Inukai Shinji
Matsuura Atsushi
Sano Hisanori
Horabik Michael
Kabushiki Kaisha Toshiba
Yusko Donald J.
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