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Fred Thomas Fred Thomas
Fred C Thomas, Don W Wallentine, James Bero, Scott Wilson: Acousto-optical intensity control of laser beam during etching of optical servo information of magnetic media. Iomega Corporation, Woodcock Washburn Kurtz Mackiewicz & Norris, January 18, 1994: US05279775 (35 worldwide citation)

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.


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Fred Thomas Fred Thomas
Thomas Fred Charles, Wallentine Don W, Bero James, Wilson Scott: Acousto-optical intensity control of laser beam. Minnesota Mining And Manufacturing Company, KURTZ Richard E, December 23, 1993: WO/1993/025341

The intensity of a beam of light used to etch concentric servo tracks (12) on a magnetic medium is adjusted with an acousto-optical device to maintain the energy density delivered by the beam substantially constant while the optics (71) which generate the beam move radially of the disk (61).