Patent Number: 8,576,407

Title: Contactless optical glide head using at least two concurrent interference signals and a multi-channel light detector for detecting disk asperities

Abstract: A device for detecting disk asperities. The device includes an optical glide head. The glide head is not required to physically contact a disk for detection of the disk asperities. The optical glide head includes a waveguide configured to transmit light onto the disk and receive reflected light from the disk.

Inventors: Flechsig; Karl (Los Gatos, CA), Singh; Gurinder (San Jose, CA), Strand; Timothy (San Jose, CA)

Assignee: HGST Netherlands B.V.

International Classification: G01B 11/02 (20060101)

Expiration Date: 1/05/12017