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Gerald A Pierce, Louis F Schaefer, Norman A Peppers, William F Mullen: Dual beam optical data system. Drexler Technology Corporation, Thomas Schneck, March 8, 1988: US04730293 (36 worldwide citation)

An optical data reading and writing system in which a laser beam records data spots on a medium and a wide light beam is used for simultaneously reading the data spots and prerecorded information. The laser beam records spots of a uniform size which is less than about ten micrometers. The wide beam ...


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Pierce Gerald A, Schaefer Louis F, Peppers Norman A, Mullen William F: Dual beam optical data system. Drexler Technology Corporation, SCHNECK Thomas, March 24, 1988: WO/1988/002169

An optical data reading and writing system in which a laser beam (14) records data spots (56, 92) on a medium and a wide light beam (100) is used for simultaneously reading the data spots and precorded information (88, 90). The laser beam records spots of a uniform size which is less than about ten ...