Optical head with a diffractive lens for focusing a laser beam
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United States of America Patent
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-
Dec 26, 2000
Grant Date -
N/A
app pub date -
Apr 11, 1997
filing date -
Apr 11, 1997
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A head slider for flying above a rotating magneto-optic or optical disk and an optical mechanical assembly with a fixed height above a rotating magneto-optic or optical disk contains magnetic coils and a lens plate with a diffractive optic structure for focusing laser light into a small spot on the disk. The diffractive optic structure may be a zone plate, a phase zone plate or a blazed phase zone plate or other diffractive focusing optical element. The diffractive optic structure does not require curved transparent material such as glass or a high index of refraction. The diffractive optic structure is easily manufactured using lithographic or other techniques.
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