SCATTERING PREVENTIVE RING-TYPE FLUORESCENT LAMP

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This invention provides a scattering preventive ring-type fluorescent lamp which has simplified a scattering preventive tube mounting step and has an improved appearance. The scattering preventive ring-type fluorescent lamp is characterized by comprising a ring shaped glass tube (1), a phosphor (4) provided on the inner surface of the glass tube (1), a pair of filaments (2a, 2b) provided on both ends of the glass tube (1), mercury sealed hermetically into the glass tube (1), a rare gas sealed hermetically into the glass tube (1), and a scattering preventive tube (5) provided around the glass tube (1) and having a ring outside thickness of 0.07 mm to 0.11 mm.