Illumination – Elongated source light unit or support – With means to accommodate additional circuit element
Patent
1990-12-14
1992-08-11
Lazarus, Ira S.
Illumination
Elongated source light unit or support
With means to accommodate additional circuit element
362260, 362265, 362 84, 439226, 439239, F21K 200
Patent
active
051385392
ABSTRACT:
A fluorescent lamp device comprises an oblate section type fluorescent lamp having an oblate cross section and provided with a luminous surface illuminating in one direction and with a back plate and a lighting circuit means attached to the back plate and adapted to light the fluorescent lamp. The fluorescent lamp is electrically connected to and integrally assembled with the lighting means including the lighting circuit board by the bendable leads and the terminal pieces capable of having various shapes. In addition, a fluorescent lamp device comprises a fluorescent lamp body which includes a front plate, a back plate and a spacer which is provided between the front plate and the back plate and which defines the oblate sectioned bulb of the fluorescent lamp. The bulb airtightly containing at least a pair of cold cathodes and rare gases, the flourescent lamp device being so designed that the discharge current density, which is the ratio of the discharge current between the pair of cold cathodes to the area of the oblate section of the bulb, is 0.30 mA/mm.sup.2 or less and that the flatness F, which is the ratio of the length in the longitudinal direction of the oblate section of the bulb to the length in the lateral direction of the same, and the pressure P (torr) of the rare gases satisfy at least one of the following inequalities (1) and (2):
REFERENCES:
patent: 2668279 (1954-02-01), Epstein
patent: 3508103 (1970-04-01), Young
patent: 4089045 (1978-05-01), Mars
patent: 4494326 (1985-01-01), Kanamori
patent: 4561044 (1985-12-01), Ogura et al.
patent: 4864473 (1989-09-01), Tokarz et al.
Honda Hisashi
Misono Katsuhide
Lazarus Ira S.
Quach Y.
Toshiba Lighting & Technology Corporation
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