Illumination unit using LED and image projecting apparatus...

Illumination – Light fiber – rod – or pipe – Light emitting diode

Reexamination Certificate

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Details

C362S551000, C362S237000, C362S268000

Reexamination Certificate

active

11119918

ABSTRACT:
An illumination unit is provided which includes a glass rod including a parabolic reflection surface, a light incident surface facing the parabolic reflection surface, a concave portion formed inwardly in the light incident surface at a position of a focal point of the parabolic reflection surface, and a light guide portion facing the parabolic reflection surface and having a rectangular section. An LED module is disposed at the focal point of the parabolic reflection surface and emitting light to the parabolic reflection surface through the concave portion. A surface of the light guide portion parallel to the light incident surface is stepped from the light incident surface in a direction in which the rectangular section of the light guide portion decreases.

REFERENCES:
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patent: 6547423 (2003-04-01), Marshall et al.
patent: 6948836 (2005-09-01), Ishida et al.
patent: 7040767 (2006-05-01), Lee et al.
patent: 7059731 (2006-06-01), Lee et al.
patent: 7097334 (2006-08-01), Ishida et al.
patent: 11-306833 (1999-11-01), None
patent: 11-329038 (1999-11-01), None
patent: 10-0422258 (2004-02-01), None

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