×

Easily-assembled compact self-ballasted fluorescent lamp

  • US 20040218385A1
  • Filed: 02/17/2004
  • Published: 11/04/2004
  • Est. Priority Date: 02/28/2003
  • Status: Active Grant
First Claim
Patent Images

1. A compact self-ballasted fluorescent lamp, comprising:

  • an arc tube formed by a glass tube double-spirally wound from a middle to both ends thereof around a predetermined axis; and

    a cylindrical holding member having an end wall where a pair of insertion openings are formed, and holding the arc tube in a state where both end parts of the glass tube are inserted in the insertion openings, wherein a pitch of (a) each end part and (b) an adjacent spiral part in a direction of the axis is larger than a pitch of other adjacent spiral parts, to widen a gap between each end part and the adjacent spiral part, and a minimum distance between (a) a first area that is on an outer surface of a spiral part adjacent to one of the ends in the direction of the axis and (b) a second area that is on a surface of the end wall and that faces the first area, is in a range of 1.5 to 4.0 mm inclusive.

View all claims
  • 2 Assignments
Timeline View
Assignment View
    ×
    ×