Electric lamp and discharge devices – With luminescent solid or liquid material – With gaseous discharge medium
Patent
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).
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Anandan Munisamy
Maya Jakob
Matsushita Research and Development Laboratory Inc.
O'Shea Sandra L.
Patel Vip
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