Monolithic beam shaping light output light device
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United States of America Patent
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May 2, 2000
Grant Date -
N/A
app pub date -
Sep 28, 1998
filing date -
Sep 28, 1998
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A monolithic light output device with a unitary construction is coupled to an optical fiber or light pipe to produce an output beam. The light output device has an elongated beam shaping rod connected to a solid lens by a conical transition section. The beam shaping rod modifies the distribution of the light from the optical fiber or light pipe by means of total internal reflection at its peripheral wall. The light passing through the beam shaping rod forms a modified light source at the end of the rod. The solid lens projects the modified light source outward to form the output beam. A controlled beam pattern with sharp beam edges is produced by forming the wall of the conical section at an expansion angle that is equal or larger than the maximum exit angle of the light from the modified light source. Local surface slope variations provided on the peripheral wall of the beam shaping rod redirect the light passing through the beam shaping rod to result in a desired beam distribution.
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