COMPACT SELF-BALLASTED FLUORESCENT LAMP, ARC TUBE AND METHOD FOR MANUFACTURING ARC TUBE

摘要

PROBLEM TO BE SOLVED: To provide a compact self-ballasted fluorescent lamp which has higher lamp efficiency than conventional lamps and maintains the rising characteristic at lamp starting at the same level as that of conventional lamps.

SOLUTION: The compact self-ballasted fluorescent lamp 1 has an outer bulb 6 encasing an arc tube 2 composed of a curved glass tube 9. The glass tube 9 has a turning portion nearly at the midpoint between both the ends thereof, a first wound part spirally wound from the one end thereof to the turning portion and a second wound part spirally wound around the axis of the first wound part from the turning portion to the other end thereof to form a double helix shape. Mercury as a single substance aside from an amalgam composition is enclosed in the glass tube 9. The glass tube 9 has a nearly circular cross sectional shape and an inner diameter of 7.4 mm. The turning portion of the glass tube 9 is connected through a heat conductive medium 15 to the outer bulb 6.

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