Method and apparatus for fabricating an optical disc master and

Details Method and apparatus for fabricating an optical disc master and Method and apparatus for fabricating an optical disc master and

1990-08-29

1992-06-02

Envall, Jr., Roy N.

Dynamic information storage or retrieval

Specific detail of information handling portion of system

Radiation beam modification of or by storage medium

369197, 3692753, 3692754, G11B 724, G11B 726

Patent

active

051193590

ABSTRACT:
A beam of light emitted from a light source and then modulated is focused through a write head onto a surface of a substrate which is coated with a photosensitive material and is rotated at a predetermined constant rotational speed. The write head and the substrate are displaced relatively in the radial direction of the substrate. While an optical axis of the beam of light is displaced in the direction in which the relative displacement speed between the write head and the substrate is decreased or increased, the substrate is exposed in such a way that a locus of a first turn or wind of predetermined tracks or pit arrays is recorded. Thereafter, while the substrate is rotated at the constant rotational speed, during the next rotation of the substrate the projection of the beam of light is interrupted and the optical axis of the beam of light is returned to its initial position. The above-described steps are repeated for recording the succeeding tracks or pit arrays, whereby a desired track pattern can be obtained.

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"Developments in Optical Disk Mastering", Pasman et al., SPIE, vol. 529, Optical Mass Data Storage (1985), pp. 62-68.
"Sector Servo Data File Optical Disk Memory", Yonezawa et al., SPIE, vol. 529, Optical Mass Data Storage (1985), pp. 84-88.

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