Method of and apparatus for playing back recordable optical disc

Details Method of and apparatus for playing back recordable optical disc Method of and apparatus for playing back recordable optical disc

1992-07-30

1994-02-22

Psitos, Aristotelis

Dynamic information storage or retrieval

Condition indicating, monitoring, or testing

Including radiation storage or retrieval

369 58, 369 50, 369 32, G11B 700

Patent

active

052894509

ABSTRACT:
Recorded information is reproduced from a recordable optical disc with a light beam applied from an optical pickup to the recordable optical disc. The recordable optical disc has a program area for recording main information, a PMA area for recording recording history information relative to main information which is in the process of being recorded in the program area, and a lead-in area for recording, as index information, recording history information relative to main information which has fully been recorded in the program area. While the recordable optical disc is at rest, it is determined whether index information is recorded in the lead-in area, and if index information is not recorded in the lead-in area, the optical pickup is moved to a region of the PMA area where the recording history information is recorded, while the recordable optical disc is at rest After the optical pickup has reached the region, the optical pickup reads the recording history information while the recordable optical disc is being rotated. After the recording history information has been read from the region, the optical pickup is moved to the program area while the recording optical disc is being rotated at a constant speed.

REFERENCES:
patent: 5051849 (1991-09-01), Fukushima et al.
patent: 5065388 (1991-11-01), Roth et al.
Patent Abstracts of Japan vol. 15, No. 292 (P-1230) 24 Jul. 1991 & JP-A-03 100 983 (Yamaha Corp.) 25 Apr. 1991.
European Search Report Application No. EP 92 30 7028 dated Mar. 31, 1993.

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