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(11) | EP 1 617 132 A3 |
| (12) | EUROPEAN PATENT APPLICATION |
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| (54) | Stem mount for light emitting diode |
| (57) A lamp assembly (10) that comprises a reflector (12) for directing light in a given
direction. An aperture (14) is formed in the reflector (12), substantially in the
base thereof, and a thermally conductive post (16) is fitted in the aperture (14)
and has a first surface (18) within the reflector and a second surface (20) outside
of the reflector. The post (16) is preferably a metal such as copper. A single, side
emitting, LED light source (22) is fixed to the first surface (18), preferably via
an electrically insulating but thermally conductive member (23). A heat sink (24)
is fixed to the second surface (20) and preferably is an inherent part thereof to
insure good heat conductivity between the post (16) and the heat sink (24). Circuitry
(26), which can be mounted on a printed circuit board, is associated with the LED
light source (22) for supplying power thereto. Suitable electrical connections, not
shown, can be supplied from the circuitry (26) to the LED light source (22) via insulated
wires running up the side of the post (16) or threaded through longitudinal apertures
formed in the post (16). Alternatively, an electrically insulating material supplied
with conductive traces can cover the post (16). The LED light source can include a
cap having a secondary reflector thereon or the light source (22) can be covered by
a dome-shaped, transparent element having sidewalls and a closed top having at least
one metallized surface and including an optic.
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