Patent ID: 7727427

Claim:
A method of fabricating a light duct, said method comprising the steps of: fabricating a light duct of thermoplastic material, the duct having a light relay constituted by a rectangular section bar for conveying light along its longitudinal axis referred to as a “first” axis, and provided at one of its ends both with a wall that is inclined relative to said first axis, and with a lens, the axis of revolution of the lens being contained in a longitudinal plane of symmetry, said duct presenting a given maximum height H max beyond the thickness of the lens and a given mean length L moy along its longitudinal axis, wherein the duct is made as a single piece by injection molding, said thermoplastic material in a mold presenting a cavity of shape identical to that of the duct; injecting through a feed orifice disposed on one side of said cavity over a face that is substantially parallel to the plane defined by said axes, wherein said feed orifice presents a height h lying in the range 0.2 H max and H max , and a length l lying in the range 0.2 L moy and 0.8 L moy ; and injecting the thermoplastic material at a rate lying in the range 400 mm 3 /s to 1500 mm 3 /s.