Illumination – Light modifier – Reflector
Patent
1991-12-17
1993-11-02
Dority, Carroll B.
Illumination
Light modifier
Reflector
362347, 362348, F21V 700
Patent
active
052588971
ABSTRACT:
A vehicular headlight reflector for forming a low beam light-distribution pattern by effectively utilizing the entire reflecting surface, and providing a light-distribution control function so that a pattern image generated substantially by a lower half surface of the reflector is located below the horizontal line and as close to the horizontal line as possible. A filament is arranged between a focus F of a reference parabola and a reference point D offset from the focus F so that its central axis extends in parallel with an axis passing through the parabola vertex O and the reference point D. A virtual paraboloid is assumed for each arbitrary point P on the reference parabola, the virtual paraboloid having an optical axis that extends in parallel with a light ray vector of a reflected light ray obtained when a light ray assumed to have been emitted from the reference point D and reflected at the point P, passing through the point P, and having the point D as its focus. A reflecting surface is formed as a collection of intersecting lines obtained when the virtual paraboloid is cut by a plane including the light ray vector and being parallel with the vertical axis (z-axis). Projected images of the light source are located so as to move around a rotation center on the horizontal line with a movement of representative points on an intersecting line in the reflecting surface.
REFERENCES:
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patent: 4481563 (1984-11-01), Snyder et al.
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patent: 4754374 (1988-06-01), Collot
patent: 4772988 (1988-09-01), Brun
patent: 4945454 (1990-07-01), Bunse et al.
patent: 5086376 (1992-02-01), Blusseau
Dority Carroll B.
Koito Manufacturing Co. Ltd.
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