Narrow angle hologram device and method of manufacturing same
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United States of America Patent
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Aug 21, 2007
Grant Date -
Mar 31, 2005
app pub date -
Sep 24, 2004
filing date -
Sep 25, 2003
priority date (Note) -
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Abstract
A method of manufacturing a master for producing a hologram device. A first master is produced with a compensating angle. The second master is produced from the first master with an index matching material to reduce the interference pattern caused by internal reflections within the holographic plate of the master. The hologram device has a relatively narrow angle of reconstruction to provide visibility from a nearly perpendicular light source such as the headlight of an on-coming vehicle.
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