Illumination – Vehicle steering mechanism or element moves pivoted lamp or... – Tie rod element controlled
Patent
1994-12-09
1997-04-15
Lazarus, Ira S.
Illumination
Vehicle steering mechanism or element moves pivoted lamp or...
Tie rod element controlled
362297, 362346, B60Q 104
Patent
active
056202466
ABSTRACT:
A headlamp for an automobile includes a reflector, a filament, and a front lens, and the filament is disposed along the principal optical axis of the reflector. The basic surface of the reflecting surface has a shape obtained by adding deformations to an elliptical paraboloid which has an elliptical cross section at a plane perpendicular to the principal optical axis. The focal length of a cross section (parabola) of a basic surface in a horizontal plane including the principal optical axis is set to be smaller than the focal length of a cross section (parabola) of the basic surface in a vertical plane including the principal optical axis. A twist is added to a region of the reflecting surface located in close proximity to the horizontal plane including the principal optical axis, and upper edges of the projected filament images of the filament due to that region are aligned, thereby forming a line constituting a basis of a horizontal cutline. Also, another headlamp for an automobile includes a reflector, a filament, and a front lens, and the filament is disposed such that its central axis orthogonally intersects the principal optical axis of the reflector and extends in the horizontal direction. The basic surface of the reflecting surface has a shape obtained by adding deformations to an elliptical paraboloid which has an elliptical cross section at a plane perpendicular to the principal optical axis.
REFERENCES:
patent: 4612608 (1986-09-01), Peitz
patent: 4731713 (1988-03-01), Perthus
patent: 4731731 (1988-03-01), Cochran
patent: 4803601 (1989-02-01), Collot et al.
patent: 4827367 (1989-05-01), Luciani
patent: 5086376 (1992-02-01), Blusseau
patent: 5192124 (1993-03-01), Kawashima et al.
patent: 5432685 (1995-07-01), Taksukawa et al.
Koito Manufacturing Co. Ltd.
Lazarus Ira S.
Raab Sara Sachie
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