Adaptor for coupling a light guide to a light source, in particu

Details Adaptor for coupling a light guide to a light source, in particu Adaptor for coupling a light guide to a light source, in particu

1985-05-21

1986-12-23

Argenbright, Tony M.

Illumination

Revolving

362 61, 362 83, F21V 704

Patent

active

046316426

ABSTRACT:
An adaptor in accordance with the invention serves to couple a cylindrical light guide (40) with a light source (10). The adaptor comprises an inlet surface (20) which is concave, which is spherical, which is centered on the center point (0) of said light source and which receives said light source in such a manner that all light rays from said source striking said inlet surface pass therethrough without being deflected and thus enter the guide; the adaptor further includes a light flux recovery surface (30) which is convex and symmetrical about the axis of the light guide, said recovery surface is such that the angle of incidence of a light ray emitted from the source and passing into the guide through the inlet surface is always greater than the limiting angle for total internal reflection corresponding to the refractive index of the material constituting the guide. In this manner, any ray which enters the light guide and which strikes the recovery surface is totally internally reflected and is consequently captured by the light guide. The invention is particularly applicable to providing integrated side lights in a compact headlamp assembly for a motor vehicle.

REFERENCES:
patent: 2808502 (1957-10-01), Large
patent: 3360640 (1967-12-01), Seitz et al.
patent: 3437804 (1969-04-01), Schaefer et al.
patent: 4151582 (1979-04-01), Grunberger

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