| 摘要 |
PURPOSE:To enable a proximity conductor to be smoothly separated from an emission tube after the burning of a lamp, by inserting the end of the proximity conductor, the other end of which is supported by a bimetal piece, into a supporting hole of a holder supporting the emission tube, with some space within the hole. CONSTITUTION:Arc discharge is developed between main electrodes 4a and 4b. On a stable burning of a lamp being achieved, the temperature of an emission tube 3 rises, and a bimetal switch 6 is kept opened by the heat of the emission tube 3. On the other hand, a bimetal piece 18 of a proximity conductor 5 also is heated by the heat of the emission tube 3 and is bent, thereby the conductor 5 being separated from the emission tube 3. Since the upper end of the conductor 5 is bent into a crank form, and is inserted in a supporting hole 20 provided in a holder 11a with a space within the hole 20, the bending of the bimetal piece 18 causes the conductor 5 to rotate within the supporting hole 20. Consequently, no unnatural backward stress is developed in the proximity conductor 5. |
