Illumination – Vehicle steering mechanism or element moves pivoted lamp or... – Tie rod element controlled
Patent
1993-09-27
1994-12-13
Lazarus, Ira S.
Illumination
Vehicle steering mechanism or element moves pivoted lamp or...
Tie rod element controlled
362282, 362283, 362284, 362319, 362401, B60Q 106, B60Q 116
Patent
active
053734246
ABSTRACT:
An automotive-type projection headlamp having a substantially elliptical reflector, a light source (bulb) located at the first focal point of the reflector, a projection lens disposed in front of the reflector, and a shade located at a position near the second focal point of the reflector for partially intercepting light passing from the reflector toward the projection lens. The shade is rotatable about a horizontal support shaft, and has a circumferential surface spirally shaped as seen in a longitudinal sectional view, so that the distance from the center of rotation of the shade to a point on the circumference thereof gradually varies. The vertex of the shade is vertically varied by turning the shade about the horizontal support shaft, thereby controlling the distribution of the output light beam. The horizontal support shaft is offset toward the projection lens from a point directly under the vertex of the shade, so that the vertex of the shade moves along a meridional image surface when the shade is turned. Balance weights may be fixed to the shade for making the center of gravity of the shade coincident with the center of rotation of the shade.
REFERENCES:
patent: 4336571 (1982-06-01), Marchand
patent: 4875141 (1989-10-01), Miyauchi et al.
patent: 5060120 (1991-10-01), Kobayashi et al.
patent: 5068768 (1991-11-01), Kobayashi
patent: 5138540 (1992-08-01), Kobayashi et al.
patent: 5158352 (1992-10-01), Ikegami et al.
Koito Manufacturing Co. Ltd.
Lazarus Ira S.
Raab Sara Sachie
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