Patent Number: 6,167,016

Title: Optical head with a diffractive lens for focusing a laser beam

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.

Inventors: Block; Barry (Los Altos, CA), Thorton; Arnold (San Jose, CA)

Assignee: Aerial Imaging Corporation

International Classification: G11B 11/00 (20060101); G11B 11/105 (20060101); G11B 7/12 (20060101); G11B 7/135 (20060101); G11B 007/125 ()

Expiration Date: 12/26/2017