Method of identifying stamper for optical information storage di

Details Method of identifying stamper for optical information storage di Method of identifying stamper for optical information storage di

1989-07-18

1991-01-08

Trafton, David

Registers

Systems controlled by data bearing records

Operations analysis

235462, 235487, G06F 1546

Patent

active

049838156

ABSTRACT:
There is disclosed a method of identifying a stamper for an optical information storage disk in order to distinguish first and second stampers from each other, the second stamper being replicated from the first stamper, each of the first and second stampers carrying recorded information signals and a printed code pattern recorded circumferentially and representing stamper identifying information from each other. The printed code pattern is read in a predetermined direction, and it is determined whether a start or stop signal of the printed code pattern is read first. The first and the second stampers are distinguished from each other in dependence on whether the start or stop signal is read first.

REFERENCES:
patent: 4166574 (1979-09-01), Yokoyama
patent: 4677604 (1987-06-01), Selby et al.
patent: 4825093 (1989-04-01), Kiriseko et al.

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