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US 2004/0070324 A1Published application
Fluorescent lamp electrode for instant start and rapid start circuits
OwnerIgor V. Lisitsyninventor
Life of this patent
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Abstract
A fluorescent lamp (10) with improved life is formed by winding a coil (30) using first, and second mandrels (45, 46), and optionally a third mandrel (70). The coil is wound around the second mandrel to provide a coil density of at least 95%. The coil is able to carry an amount of emitter material of about 0.6-1.6 mg/cm of coil. This has been found to lead to substantially increased lamp life, on both instant and rapid start circuits.
Claims24
A discharge lamp comprising:
- an envelope;
- a discharge-sustaining fill sealed inside the envelope;
- first and second electrodes for providing a discharge, at least the first electrode including a current carrying wire and a coil including at least first and second coiled structures:
- the first coiled structure formed by winding an overwind wire around a first cylindrical member,
- the second coiled structure formed by winding the first coiled structure around a second cylindrical member, the second coiled structure having a coil density of at least 95%;
- and
- an emitter material deposited on the coil.
4 more elements
A method for forming a coil for a fluorescent lamp, the method comprising:
- forming a coil including:
- winding an overwind wire around a current carrying wire to form a first coiled structure,
- winding the first coiled structure around a cylindrical member to form a second coiled structure, the second coiled structure having a coil density of at least 95%;
- and
- coating the coil with an emitter mix which, when activated, emits electrons when heated.
2 more elements
A method for forming a coil for a fluorescent lamp, the method comprising:
- forming a coil including:
- winding an overwind wire to form a first coiled structure,
- winding the first coiled structure around a cylindrical member to form a second coiled structure of a first coil density, and
- extending the second coiled structure to form a coil having a second coil density which is less than the first coil density;
- and
- coating the extended coil with an emitter mix which, when activated, emits electrons when heated.
3 more elements
Dependencies are inferred from the claim text.