Two-filament lamp for automobile headlight

Details Two-filament lamp for automobile headlight Two-filament lamp for automobile headlight

1981-12-28

1984-10-30

Nelson, Peter A.

Illumination

Multiple filament light unit

362267, 362375, 362307, 362 80, 362310, 362311, 313115, 313579, F21M 330

Patent

active

044802960

ABSTRACT:
A tungsten-halogen lamp for use in an automobile headlight comprises a tubular sealed glass capsule containing two coiled tungsten filaments for high and low beam operation, respectively. The low beam filament is disposed substantially orthogonal to a vertical plane containing the lamp axis, with the center of that filament length having a predetermined offset from that vertical plane and being disposed at or near the focal point of the reflector. The high beam filament is disposed substantially parallel to the lamp axis on the opposite side of the vertical plane from at least a major portion of the low beam filament. The filaments are spaced apart with the high beam filament lying in a horizontal plane spaced below the low beam filament, and the axis of the high beam filament orthogonally intersects a plane containing in the axis of the low beam filament.

REFERENCES:
patent: 2214472 (1940-09-01), Lund
patent: 3549935 (1970-12-01), Motoyama et al.
patent: 3898451 (1975-08-01), Murphy et al.
patent: 4233536 (1980-11-01), Waymouth et al.
patent: 4240131 (1980-12-01), Albrecht
patent: 4297611 (1981-10-01), Cortorillo
patent: 4319156 (1982-03-01), Bienvenue et al.

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