Fluorescent lamp and lighting instrument with unsaturated mercury vapor that achieves high brightness and high temperatures
US8324795B2 · kind B2 · utility
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8Claims
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Key dates
| Filing date | Dec 25, 2009 |
| Grant date | Dec 4, 2012 |
| Priority date | — |
| Expiry date | Dec 25, 2029 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH01J61/20
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
A fluorescent lamp may include a pair of hot cathode electrodes at both its ends, wherein a phosphor is formed in a laminated manner on the inner surface of a glass tube and a protection film is formed between the glass tube and the phosphor, wherein a residual impure gas in the lamp, including the amount occluded by the phosphor and the protection film, is set to 0.5% or less with the sealed rare gas partial pressure ratio, and wherein the following relationship is fulfilled: GHg=A×CL, A=0.0032-0.163 [mg/cc], wherein the amount of sealed mercury is GHg [mg], the lamp internal volume is CL [cc], and the coefficient is A [mg/cc].
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.