Optical head with a diffractive lens for focusing a laser beam

Details Optical head with a diffractive lens for focusing a laser beam Optical head with a diffractive lens for focusing a laser beam

1997-04-11

2000-12-26

Dinh, Tan

Dynamic information storage or retrieval

Specific detail of information handling portion of system

Radiation beam modification of or by storage medium

369 4415, 369112, 369 4423, 369 4416, G11B 7125

Patent

active

061670162

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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