Registers – Records – Particular code pattern
Patent
1989-05-31
1991-09-24
Levy, Stuart S.
Registers
Records
Particular code pattern
235487, 3692753, 369 59, G06K 710, G06K 1906
Patent
active
050515691
ABSTRACT:
The present invention relates to a method for recording data on an optical data recording card. The present invention discloses practical data formats for solving the following problems: (1) the control of the operation for reading out unit readout arrays by means of a line sensor; (2) the establishment of synchronism with data pits in case of the readout operation, (3) the discrimination between the adjacent unit readout arrays; (4) countermeasure taken when readout errors occurs; and (5) efficient access to data.
In order to solve the above-described problems, data pits are arranged in unit readout arrays; bars are defined for guiding the line sensor; and a format for indicating the center position of each unit readout array is prepared. Furthermore, special bars are also defined in order to correct the inclination of the line sensor. The data pits are arranged at a predetermined period and sync pits are provided to establish the synchronization with the pit period in case of the readout operation. In addition, discriminating pits are provided in order to distinguish between the adjacent readout arrays in case of the readout operation. The discriminating pits may be pits for discriminating the even-numbered unit readout arrays from the odd-numbered unit readout arrays or may be three pits so as to increase a degree of accuracy with which each unit readout array is discriminated.
A format in accordance with the present invention is provided with special error check pits in order to take countermeasure when readout errors occur. Furthermore, in order to take countermeasure 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 and so on are also recorded together with the general data. The present invention also discloses a method 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 are expected to be widely used in various fields as recording media for storage of computer programs, images, musical data and various data base.
REFERENCES:
patent: 3654624 (1972-04-01), Becker et al.
patent: 3919697 (1975-11-01), Walker
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.
patent: 4791622 (1988-12-01), Clay et al.
Kuramochi Wataru
Sakai Yorihiko
Tsuruoka Yoshiaki
Dai Nippon Insatsu Kabushiki Kaisha
Levy Stuart S.
Weinhardt Robert
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