Variable light distribution type automobile lamp
First Claim
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1. 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.
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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.
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21 Claims
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1. 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. - View Dependent Claims (2)
- a source of a substantially parallel flux of light;
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3. 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. - View Dependent Claims (4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21)
- a lamp body;
Specification