Vacuum sealed incandescent lamp with improved filament support structure
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United States of America Patent
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Aug 19, 1997
Grant Date -
N/A
app pub date -
Feb 27, 1996
filing date -
Feb 27, 1996
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A subminiature incandescent lamp has a substantially cylindrical base to which a glass envelope enclosing the interior of the lamp is sealed. A pair of contact wires or pins are made of a metal alloy that has substantially the same thermal expansion coefficient as the glass base. The contact pins are embedded and sealed to the glass base in a gas-tight manner, with a glass-to-metal seal. The contact pins extend below the base to provide external connections of the lamp to a power source. The pins also extend into the interior of the lamp, and provide electrical contact to a filament which is mounted between them. A filament support wire is anchored in the glass base at one end thereof and has a loop at its other end in which the mid-section of the filament rests and is mechanically supported.
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