| 摘要 |
655,923. Electric incandescent lamp filaments. EGYESULT IZZOLAMPA ES VILLAMOSSAGI RESZVENYTARSASAG. Nov. 12, 1948, No. 29443. Convention date, Nov. 13, 1947. [Class 39 (ii)] A coiled coil electric incandescent lamp is provided with a filament of dimensions such that the ratio between the diameter of the wire and the diameter of the core on which the primary helix is wound lies between the values 1: 1.5 and 1:1.9, and the ratio between the external diameter of the primary coil and the diameter of the secondary core is greater than 1:2.15, the pitch of the primary coil on the inner side, next to the secondary core, being so arranged that the smallest gap between two adjacent turns is greater than 6.5 microns but less than 16 microns. |
