Direct to stamper/mother optical disk mastering

Details Direct to stamper/mother optical disk mastering Direct to stamper/mother optical disk mastering

1994-07-29

1996-02-27

Bowers, Jr., Charles L.

Radiation imagery chemistry: process, composition, or product th

Imaging affecting physical property of radiation sensitive...

Making named article

430320, 430945, 264 25, 264107, 205 70, G11B 726

Patent

active

054947820

ABSTRACT:
A method and apparatus for creating an optical disk mother or stamper wherein the number of processing steps is greatly reduced from the prior art methods. In particular, the present invention involves directly forming a mother or stamper by direct laser ablation of a conductive metal substrate. More specifically, a stream of coded digital information (for example, representing the content of an encyclopedia in the case of CD ROM or a classical music collection in the case of CD audio) is converted into a corresponding plurality of pits and lands in the conductive metal substrate by electronically switching the beam of a first laser on and off via an electro or acusto-optic modulator (EOM/AOM) in response to the digital information. As a result, selective portions of the conductive substrate are either ablated (in the case where the laser is on) thereby directly creating the pits, or the substrate is left unaltered (in the case where the laser is off) thereby creating lands. These pits and lands correspond to the digital information and can be read to reproduce the same. The ablated substrate can then be used as a mother. Advantageously, no coating need first be applied to the surface of the substrate before ablation.

REFERENCES:
patent: 3980818 (1976-09-01), Browning
patent: 4430401 (1984-02-01), Wilkinson
patent: 4729940 (1988-03-01), Nee et al.
English Language Abstract of JP 63-298731, Nose, Dec. 1988.
Topics in Applied Physics, "Tunable Paramagnetic-Ion Solid-State Lasers," John C. Walling, vol. 59: Tunable Lasers, Springer-Verlag Berlin Heidelberg, 1987, pp. 331-375.

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