Heat dissipating L.E.D. traffic light

Illumination – Housing – With cooling means

Patent

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Details

362294, 362800, F21V 2900

Patent

active

057825556

ABSTRACT:
An electrically driven L.E.D. lamp assembly (14) comprising an electrically insulating circuit board (26) having opposed first and second surfaces with light emitting diodes (28) having positive and negative leads (30, 32) mounted on the first surface and an electrically conductive plating on the first surface for establishing discrete and electrically conductive paths (34) for electrically interconnecting the positive lead (30) of one the light emitting diodes to the negative lead (32) of another of the light emitting diodes. A plurality of holes extend through the board (26) and a plurality of pads (50) of thermally conductive plating are disposed on the second side with each pad (50) associated with one of the holes and a thermally conductive material extending through the holes and thermally connecting each of the pads (50) and one of the leads to conduct heat from each of the leads to one of the pads (50) while maintaining electrical isolation between the pads. The pads (50) are rectangular in area configuration and are separated by a grid of crossing lines (54) of separation, the lines (54) being in transverse groups with all the lines (54) in one group being parallel and at right angles to the lines (54) in the other group and are separated from one another a discrete distance which is only of a magnitude sufficient to prevent electrical conductivity from pad (50) to pad (50). A heat sink includes a base (36) overlying the second surface and a shell (38) extending forwardly from the base (36) in front of the light emitting diodes (28) for conducting heat to the light emitting side of the assembly.

REFERENCES:
patent: 4729076 (1988-03-01), Masami et al.
patent: 5008788 (1991-04-01), Palinkas
patent: 5038255 (1991-08-01), Nishihashi et al.
patent: 5528474 (1996-06-01), Roney et al.

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