Fluorescent lamp with protected cathode to reduce end darkening

Details Fluorescent lamp with protected cathode to reduce end darkening Fluorescent lamp with protected cathode to reduce end darkening

1995-10-23

1997-11-11

Horabik, Michael

Electric lamp and discharge devices

With gas or vapor

Having electrode shield

313242, 313492, H10J 6110

Patent

active

056867956

ABSTRACT:
A low-pressure mercury vapor discharge lamp (10) includes a tubularly-shaped envelope (12) sealed at each end with a stem assembly (14). A fluorescent coating (26) is disposed on the interior surface of the envelope (12) and an electric discharge sustaining fill gas is provided within a hollow interior (24) of the envelope (12). Each stem assembly (14) includes a glass base portion (30) which seals the end of the envelope (12), an electrode (16), and a tubularly-shaped, light-transmissive, glass shield (22). The electrode (16) is disposed within the envelope (12) such that an electric discharge occurs between the electrodes (16) upon operation of the lamp (10). The glass shield (22) extends past the electrode (16) to partially surround the electrode (16) and shield the interior surface of the envelope (12) from material ejected from the electrode (16). The glass shield (22) allows the electric discharge to unaffectedly pass through an open end (42). Structural variations for supporting the glass shield (22) are also disclosed.

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