Near-field recording for small form factor optical disks

Devices and Materials Lab., LG Electronics Institute of Technology, 16 Woomyeon-Dong, Seocho-Gu, Seoul 137-724, Korea

Corresponding author: jinhkim@lge.com

Received: 17 July 2006
Revised: 8 October 2006
Accepted: 7 November 2006
Published online: 24 January 2007

Abstract

Small form factor optical disk (SFFOD) with a diameter of 27.4 mm was prepared for a mobile application. Near-field recording (NFR) technology with a flying optical head is applied to SFFOD for high density and small volume. A problem of contamination was observed at the head-disk interface (HDI) for first-surface recording. As a solution of the problem, a cover-layer was laminated onto the disk to move the focal plane into the media, which could solve the contamination problem. An edge bead free cover-layer could be coated with UV curable resin by using an outer-ring technique during the spin coating process. A diamond-like carbon (DLC) film and a lubricant film were coated on the disk to reduce the HDI problems.