Dynamic information storage or retrieval – Specific detail of information handling portion of system – Radiation beam modification of or by storage medium
Patent
1989-05-31
1990-11-13
Richardson, Robert L.
Dynamic information storage or retrieval
Specific detail of information handling portion of system
Radiation beam modification of or by storage medium
235456, 235494, 235487, 369 59, 369 47, G06K 1906, G11B 7007
Patent
active
049707124
ABSTRACT:
A format is provided with special error check pits in order to take countermeasures when readout errors occur. Furthermore, in order to take countermeasures when readout errors occur due to local contamination on the optical data recording card, the data are distributed and then recorded. In order to perform the efficient access to data, required data representing a predetermined address value are also recorded together with the general data. A method is also provided for forming pits by modulating the digital signal and an optical system as well as a signal processing system of a reading device used in connection with the optical data recording cards. The optical data recording cards on which are recorded the data by the method of the present invention can be used in various fields as recording media for storage of computer programs, images, musical data and various data bases.
REFERENCES:
patent: 4213040 (1980-07-01), Gokey et al.
patent: 4634850 (1987-01-01), Pierce et al.
patent: 4652730 (1987-03-01), Marshall
patent: 4728783 (1988-03-01), Brass et al.
Electronics, 5/1/75, p. 90.
International Organization for Standardization, 6/1/76, pp. 4, 5.
Kuramochi Wataru
Sakai Yorihiko
Tsuruoka Yoshiaki
Dai Nippon Insatsu Kabushiki Kaisha
Richardson Robert L.
Weinhardt Robert A.
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