Method and device for accessing an optical disc

Details Method and device for accessing an optical disc Method and device for accessing an optical disc

1993-03-24

1995-08-22

Epps, Georgia Y.

Dynamic information storage or retrieval

Condition indicating, monitoring, or testing

Including radiation storage or retrieval

369 48, 369 58, 369 60, G11B 700

Patent

active

054446872

ABSTRACT:
In a method and a device for accessing an optical disc such as a Compact Disc, a CD-ROM, a CD-I and a MD, an optical disc in which data is recorded or to be recorded at a constant linear velocity is rotated at a substantially constant number of revolution per unit time and this optical disc is accessed on the basis of a clock signal which changes its frequency in accordance with an access position (i.e., a read position or write position). Since random accessing is made in a state in which the optical disc is rotated at a substantially constant number of revolution per unit time, it is not necessary to wait in accessing until a stable revolution number is attained but the waiting time is determined only by time required for moving of the read head. This enables the waiting time to be reduced and thereby realizes accessing to the optical disc at a higher speed.

REFERENCES:
patent: 5182741 (1993-01-01), Maeda et al.
patent: 5210733 (1993-05-01), Yamauchi et al.
patent: 5212678 (1993-05-01), Roth et al.
patent: 5243587 (1993-09-01), Itoh et al.
patent: 5257248 (1993-10-01), Ogasawara

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