Variable light distribution type automobile lamp
AssigneeKoito Manufacturing Co., Ltd.
InventorSyoji Kobayashi
Life of this patent
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Abstract
A variable light distribution type automobile lamp capable of varying the range of diffusion of a flux of light by changing the position of one of two cylindrical lenses. Flat areas are formed at the centers of both lenses to produce a spot beam at the center of the ouput light flux. The lenses are aligned with one another using this spot beam. The invention also provides a device for varying the distance between the lenses in the direction of the optical axis without rotating the lenses relative to one another.
Claims21
A variable light distribution type automobile lamp comprising:
- a source of a substantially parallel flux of light;
- first and second lenses disposed in said flux of light, each of said first and second lenses each having formed therein a plurality of parallel cylindrical lens steps of equal pitch and a flat area, said flat areas being aligned with each other in said flux of light;
- and means for varying a spacing between said first and second lenses.
A variable light distribution type automobile lamp comprising:
- a lamp body;
- a source of a substantially parallel flux of light disposed within said lamp body;
- first and second lenses having a plurality of parallel cylindrical lens steps formed therein;
- a first frame fixed with respect to said first lens;
- a second frame fixed with respect to said second lens, said second frame being slidably and nonrotationally mounted with respect to said first frame, whereby a distance between said first and second lenses can be changed without rotating said first and second lenses with respect to one another;
- and means for translationally driving said second frame relative to said first frame.
Dependencies are inferred from the claim text.