Dual-filament halogen incandescent lamp, particularly sealed-beam, automotive headlight
AssigneePatent-Treuhand-Gesellschaft fur elektrische Gluhlampen mbH
InventorsRolf Kiesel, Manfred Gaugel
Life of this patent
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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.
Claims8
Automotive head lamp dual-filament halogen incandescent lamp in combination with a reflector structure (R) having a reflector axis (R.A.) comprising
- a lamp bulb (1) having a longitudinal lamp axis (L);
- two longitudinally spiral filament (4,5) positioned within the lamp bulb (1) parallel to the longitudinal axis (L) of the bulb;
- at least three current supply wires (6, 6', 8) positioned in a lamp bulb and respectively connected to the respective filaments to permit, selectively, individually energization of the two filaments;
- a bridge (7) extending across the lamp bulb, at least two of the current supply wires passing through the bridge;
- wherein transverse
- the two filaments (4,5) are in mutual essential/alignment with respect to the longitudinal extent of the filament;
- one filament (4) is located laterally to one side of the longitudinal axis (L) of the bulb and the other filament (5) is located laterally to the other side of the longitudinal axis (L) of the bulb, and is in a plane passing through said one filament and the axis (L) of the bulb;
- said filaments (4,5) are located in planes which are parallel to the plane of symmetry (S) of the lamp;
- and
- the longitudinal axis (L) of the lamp bulb is parallel to and offset from the reflector axis (R.A.).
Dependencies are inferred from the claim text.