Dynamic information storage or retrieval – Information location or remote operator actuated control – Selective addressing of storage medium
Patent
1982-08-02
1985-05-21
Pitts, Harold I.
Dynamic information storage or retrieval
Information location or remote operator actuated control
Selective addressing of storage medium
369 32, 369 44, 369 59, G11B 700
Patent
active
045190542
ABSTRACT:
The method for formatting optically encoded digital data on a planar substrate (11) without timing or synchronization data to form a data record carrier (10) includes the steps of: selecting an accuate track path on the substrate (11) for each one of a plurality of arcuate tracks (14, 14a, 14b) of data (12); selecting a data cell length (15) in the direction of each track (14) for each bit of data to be stored in each cell (15) on each track (14); selecting a cell width dimension transverse to the direction of the track (14); selecting a non-transition cell (A, C) for one form of logic (0 or 1) to be stored in each such cell (15); selecting a transition cell (B) for the other form of logic (1 or 0) to be stored in each such other cell (15); establishing a leader section (22) for each track (14); establishing a tailer section (24) for each track (14); establishing a front track address section (32) for each track; establishing a back track address section (44) for each track (14) and creating the tracks (14a and 14b) with the above parameters on a substrate (11) with each track (14) being spaced from an adjacent track (14) by a predetermined distance along a common centerline of the tracks (14) and with each track (14) having the same radius throughout the arcuate path of the track (14) such that the tracks (14) extend in an arcuate manner across the data record carrier (10) and are arranged in a nested manner relative to adjacent tracks (14) along the common centerline to form the data record carrier (10). Preferably, the tail end of each track (14) is a mirror image of the leading end of the track (14) to facilitate locating and identifying each track reading forward or backward. Also, coded groups (34, 42 or 50, 52) are formed on each track between the ends thereof with the coding thereof facilitating error detection and error correction.
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patent: 4308455 (1981-12-01), Bullis
patent: 4321635 (1982-03-01), Tsuyuguchi
patent: 4348659 (1982-09-01), Fujimori
patent: 4363116 (1982-12-01), Kleuters
News Log International, Inc.
Pitts Harold I.
Vigil Thomas R.
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