ELECTRIC INCANDESCENT LAMP Russian patent published in 2015 - IPC H01K1/00 

FIELD: electricity.

SUBSTANCE: electric incandescent lamp contains a base, a bulb, a holder, electrodes, a heat body consisting of several filaments fixed on electrodes and installed with a possibility of alternate switching of each of them. The filament is made consisting, at least, of three parts, one central and two main peripheral ones, placed and fixed on the named electrodes. The central filament part has a length exceeding the length of each peripheral part, at least, twice, and the body heat contains the additional peripheral filaments connected parallel to the main ones.

EFFECT: improvement of operational performance.

1 dwg