System and method using a reduce profile light beam for high density recording on optical media
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United States of America Patent
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Jul 27, 1993
Grant Date -
N/A
app pub date -
Aug 1, 1991
filing date -
Aug 1, 1991
priority date (Note) -
Expired
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Abstract
A system and method for recording on optical storage media utilize a beam projection assembly including a collimating lens and an objective lens. By providing an incident light beam having a substantially constant energy distribution to the objective lens, the radius of the spot projected on the optical media having an intensity greater than a threshold intensity may be increased. The radius may be further decreased by modifying the optics of the objective lens, typically by providing a center stop plate on the lens or by providing a one-half wavelength plate on the lens.
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