公开(公告)号：SG87048A1

公开(公告)日：2002-03-19

申请号：SG1999004432

申请日：1994-11-01

Applicant: IBM

Inventor： PETER MICHAEL BAUMGART ,  WING PUN LEUNG ,  HUNG VIET NGUYEN ,  THAO ANH NGUYEN ,  ANDREW CHING TAM ,  ANTHONY WU

IPC: B23K26/00 ,  C03C23/00 ,  G11B5/73 ,  G11B5/82 ,  G11B5/84 ,  C03 ,  C04B41/00

Abstract: A process is disclosed for creating an array of bumps to texture a brittle surface, such as a glass substrate 12 for data recording disks. The texturing process uses a laser 10 to provide pulses of proper energy fluence to the brittle glass surface to produce a plurality of raised bumps in the surface. The bump creation is accomplished without unwanted micro-cracking or ejection of surface material by limiting the laser pulse fluence to a value in a narrow operating region discovered below the abrupt thermal shock fluence threshold for the brittle surface material. The process is also applicable to other brittle surface textures, such as those intended for use as "stamping surfaces" for the contact reproduction of the negative of a surface pattern, such as an optical disk.

公开(公告)号：MY107917A

公开(公告)日：1996-06-29

申请号：MYPI19931332

申请日：1993-07-07

Applicant: IBM

Inventor： MARY F DORNER ,  DAN S PARKER ,  ANTHONY WU ,  TADASHI YOGI

IPC: C23C14/06 ,  C23F4/00 ,  G11B5/64 ,  G11B5/65 ,  G11B5/72 ,  G11B5/73 ,  G11B5/738 ,  G11B5/82 ,  G11B5/84 ,  G11B5/851 ,  G11B25/04 ,  G11B33/14

Abstract: A MAGNETIC RECORDING DISK BASED ON CONVENTIONAL DISK TECHNOLOGY HAS BOTH AN EXTREMELY SMOOTH TOP SURFACE AND HIGH COERCIVITY, AND IS INCORPORATED IN A CONTACT RECORDING DISK FILE WHICH REQUIRES AN EXTREMELY SMOOTH HEAD-DISK INTERFACE AND A DISK WITH HIGH COERCIVITY. A SUPERFINISHED UNTEXTURED NIP COATING ON A DISK SUBSTRATE IS OXIDIZED TO FORM A NI0 FILM. THE NI0 FILM PERMITS THE SUBSEQUENTLY SPUTTER DEPOSITED MAGNETIC LAYER TO HAVE MUCH HIGHER COERCIVITY, WHICH ENABLES THE DISK TO BE USED IN CONTACT RECORDING APPLICATIONS. THE NI0 FILM AND THE LATER DEPOSITED LAYERS MAKING UP THE DISK, INCLUDING THE TOP PROTECTIVE OVERCOAT. CONFORM TO THE SMOOTH SURFACE OF THE POLISHED NIP, THUS PRESERVING THE EXTREMELY SMOOTH SURFACE OF THE TOP LAYER OF THE DISK, WHICH IS REQUIRED FOR THE HEAD-DISK INTERFACE IN CONTACT RECORDING DISK FILES. IN THE PREFERRED PROCESS FOR FORMING THE NI0 FILM ON THE SUBSTRATE, THE SUBSTRATE IS ANNEALED IN AIR AT A TEMPERATURE BELOW THAT WHICH WOULD CAUSE THE NIP FILM TO CRYSTALLIZE.(FIG. 5)