Disc reproducing apparatus

Claim 1

An apparatus for reproducing data stored in a constant linear velocity format within a data area on a disc, comprising: rotating means for rotating the disc about an axis of rotation thereof; data processing means having a plurality of optical pickup devices, fixed with respect to each other and the axis of rotation of the rotating means, for reading the data from the rotating disc, each optical pickup device comprising a movable lens which moves to read the data from different sections of the data area; and control means for controlling the revolution of the rotating disc in accordance with a position of a beam spot created by at least one of the movable lens.

Claim 2

An apparatus for reproducing data stored in a constant linear velocity format within a data area on a disc, comprising: rotating means for rotating the disc about an axis of rotation thereof; data processing means having a plurality of optical pickup devices, fixed with respect to each other and the axis of rotation of the rotating means, for reading the data from the rotating disc, each optical pickup device comprising a movable lens which moves to read the data from different sections of the data area; and control means for controlling the revolution of the rotating disc in accordance with a position of a beam spot created by at least one of the movable lens.

Claim 8

An apparatus for reproducing data stored in a constant linear velocity format within a data area on a disc, comprising: rotating means for rotating the disc about an axis of rotation thereof; a plurality of optical pickup devices, fixed with respect to each other and the axis of rotation of the rotating means, for reading the data from the rotating disc, each optical pickup device comprising a movable lens, the movable lenses simultaneously read the data from different parts of the data area on the disc; a plurality of processing units for processing the data read by each of the optical pickup devices; data storing means having a plurality of storage areas corresponding to the processing units for storing the data processed by the plurality of processing units; and control means for reading the data stored in the storage areas and transmitting the data in response to an access requirement.

Claim 9

An apparatus for reproducing data stored in a constant linear velocity format within a data area on a disc, comprising: rotating means for rotating the disc about an axis of rotation thereof; a plurality of optical pickup devices, fixed with respect to each other and the axis of rotation of the rotating means, for reading the data from the rotating disc, each optical pickup device comprising a movable lens, the movable lenses simultaneously read the data from different parts of the data area on the disc; a plurality of processing units for processing the data read by each of the optical pickup devices; data storing means having a plurality of storage areas corresponding to the processing units for storing the data processed by the plurality of processing units; and control means for reading the data stored in the storage areas and transmitting the data in response to an access requirement.

Claim 10

An apparatus for reproducing digital data stored in a constant linear velocity format within a data area on a disc, the digital data being composed of a series of data blocks which have corresponding address data to identify each said data block, comprising: rotating means for rotating the disc about an axis of rotation thereof; a plurality of optical pickup devices, fixed with respect to each other and the axis of rotation of the rotating means, for reading the data from the rotating disc, each pickup device comprising a movable lens which moves to read the data from a different part of the data area on the disc; first control means for controlling the rotating means to rotate the disc at a first speed corresponding to one of the optical pickup devices, and controlling the optical pickup devices to simultaneously begin to read out the data during a first reproduction mode; data processing means having a plurality of processing units for processing the data read by each of the optical pickup devices and outputting processed data corresponding to the data; first storing means having a plurality of storage areas, each corresponding to each said data block identified by the corresponding address data, for storing the processed data, composed of said data blocks, output by each of the processing units in the first reproduction mode; second storing means for storing flag data for identifying the storage areas of the first storing means and indicating which of said each data block was stored in a corresponding one of the storage areas; detecting means for inspecting the flag data to detect absence of the data stored in the storage areas of the first storing means; and second control means acting in response to the detecting means for controlling the rotating means to rotate the disc at a second speed corresponding to a selected one of the optical pickup devices which is to read out missing data determined by inspecting the flag data, the second control means causing the selected optical pickup device to read out the missing data in a second reproduction mode.

Claim 11

An apparatus for reproducing digital data stored in a constant linear velocity format within a data area on a disc, the digital data being composed of a series of data blocks which have corresponding address data to identify each said data block, comprising: rotating means for rotating the disc about an axis of rotation thereof; a plurality of optical pickup devices, fixed with respect to each other and the axis of rotation of the rotating means, for reading the data from the rotating disc, each pickup device comprising a movable lens which moves to read the data from a different part of the data area on the disc; first control means for controlling the rotating means to rotate the disc at a first speed corresponding to one of the optical pickup devices, and controlling the optical pickup devices to simultaneously begin to read out the data during a first reproduction mode; data processing means having a plurality of processing units for processing the data read by each of the optical pickup devices and outputting processed data corresponding to the data; first storing means having a plurality of storage areas, each corresponding to each said data block identified by the corresponding address data, for storing the processed data, composed of said data blocks, output by each of the processing units in the first reproduction mode; second storing means for storing flag data for identifying the storage areas of the first storing means and indicating which of said each data block was stored in a corresponding one of the storage areas; detecting means for inspecting the flag data to detect absence of the data stored in the storage areas of the first storing means; and second control means acting in response to the detecting means for controlling the rotating means to rotate the disc at a second speed corresponding to a selected one of the optical pickup devices which is to read out missing data determined by inspecting the flag data, the second control means causing the selected optical pickup device to read out the missing data in a second reproduction mode.