Fluorescent lamp with different density phosphor coatings on the

Details Fluorescent lamp with different density phosphor coatings on the Fluorescent lamp with different density phosphor coatings on the

1996-03-18

1998-01-13

O'Shea, Sandra L.

Electric lamp and discharge devices

With luminescent solid or liquid material

With gaseous discharge medium

313485, 313635, H01J 6304

Patent

active

057083240

ABSTRACT:
A flat compact fluorescent lamp is disclosed. The lamp contains a fill of mercury and inert gas. The lamp includes a glass front panel (1) having an inner surface and a glass bottom panel (2) also having an inner surface. A convoluted glass partition (3) having an eccentric spiral shape and smooth bends is disposed between the inner surfaces of the front and bottom panels and with the bottom panel (2) defines a channel (4) in the lamp. The channel (4) has a fairly uniform width. A phosphor coating (6) of a predetermined density between about 3 and 5 mg./cm.sup.2 is disposed on the inner surface of the channel (4) and a phosphor coating (8) of a predetermined density of between about 0.5 and 1.5 mg./cm.sup.2 is disposed on the inner surface of the front panel (1). Two electrodes (14a & 14b) are disposed at opposite ends of the spiral in the lamp to form an arc which emits UV light to excite the phosphor (6 & 8) to emit light. Substantially all the light emerging from the phosphor 6 on the channel (4) passes through the thinner phosphor (8) coating on the front panel (1).

REFERENCES:
patent: 2405518 (1946-08-01), Polevitzky
patent: 2406146 (1946-08-01), Holmes
patent: 2501376 (1950-03-01), Breadner et al.
patent: 2555749 (1951-06-01), Krefft
patent: 3043983 (1962-07-01), Ray
patent: 3247415 (1966-04-01), Martyny
patent: 3258630 (1966-06-01), Scott
patent: 3646383 (1972-02-01), Jones et al.
patent: 4839555 (1989-06-01), O'Mahoney
patent: 5041762 (1991-08-01), Hartai

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