Patent ID: 7414358
Filing Date: 2008-08-19
Classification: C03B,H01J

Abstract:
1. A fluorescent lamp comprising: an arc tube that is formed by a bent glass tube and in which mercury is enclosed; a globe that covers the arc tube; and a heat-conductive member that is provided between a part of the arc tube and the globe for contacting and conducting heat from the arc tube to the globe, wherein the arc tube has a double-spiral structure, and encloses a single discharge path and a pair of electrodes, the mercury enclosed in the arc tube is in at least one of (a) a substantially single form, and (b) an amalgam form whose mercury vapor pressure characteristics at lighting are substantially equivalent to mercury vapor pressure characteristics of mercury in a single form at lighting, the part of the arc tube contacting the heat-conductive member is at a most distant part along an axis of the glass tube relative to the pair of electrodes and is substantially at the middle of the discharge path, and the glass tube has a substantially circular-shaped cross section, and has an inner diameter in a range of 5 to 9 mm inclusive.