skip to main content
OSTI.GOV title logo U.S. Department of Energy
Office of Scientific and Technical Information

Title: Laser illuminator and optical system for disk patterning

Abstract

Magnetic recording media are textured over areas designated for contact in order to minimize friction with data transducing heads. In fabricating a hard disk, an aluminum nickel-phosphorous substrate is polished to a specular finish. A mechanical means is then used to roughen an annular area intended to be the head contact band. An optical and mechanical system allows thousands of spots to be generated with each laser pulse, allowing the textured pattern to be rapidly generated with a low repetition rate laser and an uncomplicated mechanical system. The system uses a low power laser, a beam expander, a specially designed phase plate, a prism to deflect the beam, a lens to transmit the diffraction pattern to the far field, a mechanical means to rotate the pattern and a trigger system to fire the laser when sections of the pattern are precisely aligned. The system generates an annular segment of the desired pattern with which the total pattern is generated by rotating the optical system about its optic axis, sensing the rotational position and firing the laser as the annular segment rotates into the next appropriate position. This marking system can be integrated into a disk sputtering system for manufacturing magneticmore » disks, allowing for a very streamlined manufacturing process.« less

Inventors:
 [1];  [1];  [1];  [2];  [1]
  1. Livermore, CA
  2. Pleasanton, CA
Publication Date:
Research Org.:
Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
OSTI Identifier:
872912
Patent Number(s):
US 6037565
Assignee:
Regents of University of California (Oakland, CA)
DOE Contract Number:  
W-7405-ENG-48
Resource Type:
Patent
Country of Publication:
United States
Language:
English
Subject:
laser; illuminator; optical; disk; patterning; magnetic; recording; media; textured; designated; contact; minimize; friction; data; transducing; heads; fabricating; hard; aluminum; nickel-phosphorous; substrate; polished; specular; finish; mechanical; means; roughen; annular; intended; head; band; allows; thousands; spots; generated; pulse; allowing; pattern; rapidly; repetition; rate; uncomplicated; power; beam; expander; specially; designed; phase; plate; prism; deflect; lens; transmit; diffraction; field; rotate; trigger; fire; sections; precisely; aligned; generates; segment; desired; total; rotating; optic; axis; sensing; rotational; position; firing; rotates; appropriate; marking; integrated; sputtering; manufacturing; disks; streamlined; process; recording media; specially designed; manufacturing process; repetition rate; laser pulse; power laser; magnetic recording; diffraction pattern; mechanical means; phase plate; desired pattern; rate laser; minimize friction; rapidly generated; rotational position; transducing heads; precisely aligned; /219/

Citation Formats

Hackel, Lloyd A, Dane, C Brent, Dixit, Shamasundar N, Everett, Mathew, and Honig, John. Laser illuminator and optical system for disk patterning. United States: N. p., 2000. Web.
Hackel, Lloyd A, Dane, C Brent, Dixit, Shamasundar N, Everett, Mathew, & Honig, John. Laser illuminator and optical system for disk patterning. United States.
Hackel, Lloyd A, Dane, C Brent, Dixit, Shamasundar N, Everett, Mathew, and Honig, John. Sat . "Laser illuminator and optical system for disk patterning". United States. https://www.osti.gov/servlets/purl/872912.
@article{osti_872912,
title = {Laser illuminator and optical system for disk patterning},
author = {Hackel, Lloyd A and Dane, C Brent and Dixit, Shamasundar N and Everett, Mathew and Honig, John},
abstractNote = {Magnetic recording media are textured over areas designated for contact in order to minimize friction with data transducing heads. In fabricating a hard disk, an aluminum nickel-phosphorous substrate is polished to a specular finish. A mechanical means is then used to roughen an annular area intended to be the head contact band. An optical and mechanical system allows thousands of spots to be generated with each laser pulse, allowing the textured pattern to be rapidly generated with a low repetition rate laser and an uncomplicated mechanical system. The system uses a low power laser, a beam expander, a specially designed phase plate, a prism to deflect the beam, a lens to transmit the diffraction pattern to the far field, a mechanical means to rotate the pattern and a trigger system to fire the laser when sections of the pattern are precisely aligned. The system generates an annular segment of the desired pattern with which the total pattern is generated by rotating the optical system about its optic axis, sensing the rotational position and firing the laser as the annular segment rotates into the next appropriate position. This marking system can be integrated into a disk sputtering system for manufacturing magnetic disks, allowing for a very streamlined manufacturing process.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = {2000},
month = {1}
}

Patent:

Save / Share: