Optically readable information disk

Details Optically readable information disk Optically readable information disk

1987-06-01

1989-05-02

Stephan, Steven L.

Dynamic information storage or retrieval

Storage medium structure

Specified center hole or locating structure

369270, 369282, 425810, G11B 726

Patent

active

048274690

ABSTRACT:
Method of providing a substrate of an optically readable information disc with an optically detectable structure, mould for use in the method, apparatus for carrying out the method, and information disc manufactured in accordance with the method.
Substrate (3) is provided with a disc hub (8) comprising disc-centering means (9) which serve to center the finished information disc (17) on the drive spindle (27) of a drive apparatus. The intermediate product comprising the substrate (3) and the disc hub (8) is centered on the base (1A) of the mould by cooperation between the base-centering means (17) and the disc-centering means (9). This may be effected by the use of an auxiliary centering means (12) which is in contact with a wall (14) of a central centering hole (11) in the disc hub (8) and with a wall (13) of a central centering recess (10) in the base (1A). Thus, the reproduction layer is cured in the position which is thus centered without any play, after which the substrate together with the disc hub is detached from the mould without the centering of the servo track on the substrate being disturbed.

REFERENCES:
patent: 3035840 (1962-05-01), Scott
patent: 4074282 (1978-02-01), Balas et al.
patent: 4224648 (1980-09-01), Roling
patent: 4312823 (1982-01-01), Kraakman
patent: 4363116 (1982-12-01), Klewters et al.
patent: 4470137 (1984-09-01), Tago
patent: 4634617 (1987-01-01), Ohta et al.
patent: 4672395 (1987-06-01), Ata et al.

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