<p>The intensity of a beam of light used to etch concentric servo tracks on a magnetic medium is adjusted with an acousto-optical device to maintain a substantially constant energy density delivered by the beam while the optics which generate the beam move radially of the disk.</p>
申请公布号
EP0644813(A1)
申请公布日期
1995.03.29
申请号
EP19930925176
申请日期
1993.06.08
申请人
MINNESOTA MINING AND MANUFACTURING COMPANY
发明人
THOMAS, FRED, CHARLES;WALLENTINE, DON, W.;BERO, JAMES;WILSON, SCOTT