Diffractive lens with gratings modified to offset effects caused by holding the lens at an angle with respect to a light source
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United States of America Patent
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Oct 15, 2002
Issued Date -
N/A
app pub date -
Jan 27, 2000
filing date -
Jan 26, 2000
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A diffractive lens constructed in accordance with the invention comprises a set of bands such that the diffractive gratings in each band are modified. This is done to ensure that even if the lens is tilted (e.g. to prevent light from reflecting off the lens and, introducing distortion into an optical system), the lens continues to focus light onto a small point on a target surface. (The target surface is typically an optical or magneto-optic data recording medium.)
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