Dual-filament halogen incandescent lamp, particularly sealed-bea

Details Dual-filament halogen incandescent lamp, particularly sealed-bea Dual-filament halogen incandescent lamp, particularly sealed-bea

1979-09-17

1981-11-24

Segal, Robert

Electric lamp and discharge devices

With support and/or spacing structure for electrode and/or...

For plural electrodes of discharge device

313316, H01K 0000

Patent

active

043026982

ABSTRACT:
The lamp bulb (1) has two filaments (4, 5) positioned within the bulb and rallel to the longitudinal axis (L) thereof, for example located at an axis of symmetry passing through the longitudinal axis, or in two respective planes of symmetry (E4, E5) which are, respectively, parallel to the axis of symmetry (S) of the lamp, the two filaments being preferably symmetrically positioned with respect to the axis of symmetry of the lamp (L). When located in a sealed-beam headlight, one of the filaments forms a depressed beam and the other the high beam, the high beam being preferably positioned along the axis of the reflector, at or close to the focal point thereof, for example by an off-center positioning of the bulb within the reflector.

REFERENCES:
patent: 3646385 (1972-02-01), Wichert
patent: 3646386 (1972-02-01), Rijnders
patent: 3736452 (1973-05-01), Rijnders
patent: 4074167 (1978-02-01), Broek et al.
patent: 4640399 (1968-04-01), Matsushita

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