Automotive headlamp having reduced chromatic aberration
AssigneeKoito Manufacturing Co., Ltd.
InventorMasaru Yamada
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Abstract
The present invention relates to an automotive headlamp construction in which chromatic aberation is substantially eliminated. The headlamp includes an elliptic reflector, a light source disposed at a first focal point of the elliptic reflector, a condenser lens which is focused generally at a second focal point of the elliptic reflector, and an outer lens provided in front of the condenser lens. In accordance with the invention, the radius of curvature of the outer lens is reduced at a vertically middle portion thereof to form an angled portion through which light from the light source passes. The angled portion acts as a lens having a focal length such that chromatic aberration of the condenser lens is canceled out.
Claims1
An automotive headlamp comprising:
- an elliptical reflector;
- a light source located at a first focal point of said elliptical reflector;
- a condenser lens focused substantially at a second focal point of said elliptical reflector;
- a shade provided in front of said reflector for shielding part of light from said light source;
- and
- an outer lens provided in front of said condenser lens, said outer lens having an angled portion extending along a vertically middle portion thereof having a radius of curvature smaller than in other portions of said outer lens, said outer lens being positioned such that light from said light source passes through said angled portion.
Dependencies are inferred from the claim text.