Static information storage and retrieval – Addressing – Optical
Patent
1979-01-31
1980-12-09
Hecker, Stuart N.
Static information storage and retrieval
Addressing
Optical
1791003V, 3581285, G11C 1304, G11B 700
Patent
active
042388430
ABSTRACT:
A disc-shaped record carrier having an information track which is divided into a plurality of sectors per track circumference. Each sector is divided into a data section, in which the data can be recorded, and a synchronizing section. This synchronizing section consists of an optically detectable relief structure and comprises an indicator portion and an address portion. The address portion contains the information about the track number and the sector number. The indicator portion serves to define the beginning of the address portion unambiguously and for this purpose has such a relief structure that the indicator signal produced after cooperation with the radiation beam has a frequency which is clearly distinguishable from signal components resulting from the address portion.
REFERENCES:
patent: 3371154 (1968-02-01), Frohbach et al.
patent: 3812477 (1974-05-01), Wieder
patent: 4138741 (1979-02-01), Hedlund et al.
Mathiew, A Random Access System Adapted for the Optical Videodisc; Its Impact on Information Retrieval, SMPTE Journal, 2/77, vol. 86, pp. 80-83.
Carasso Marino G.
de Haan Maarten R.
Verboom Johannes J.
Briody Thomas A.
Cohen Simon L.
Hecker Stuart N.
Streeter William J.
U.S. Philips Corporation
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