Recording state detecting apparatus and optical recording medium

Details Recording state detecting apparatus and optical recording medium Recording state detecting apparatus and optical recording medium

1994-08-22

1996-01-09

Epps, Georgia Y.

Dynamic information storage or retrieval

Condition indicating, monitoring, or testing

Including radiation storage or retrieval

369 54, 369 47, 369124, G11B 700

Patent

active

054835135

ABSTRACT:
A recording state detecting apparatus is provided with a saturated amplitude detecting unit for detecting a saturated amplitude level of a reproduced signal from a long mark obtained from a magneto-optical disk, an unsaturated amplitude detecting unit for detecting an unsaturated amplitude level of a reproduced signal from an isolation pattern of a short mark and a calculating unit for detecting a recording state (recording sensitivity or amplitude ratio) from the saturated amplitude level and the unsaturated amplitude level. As a result, an accurate recording state, namely, the recording sensitivity or the amplitude ratio of a recording mark can be detected, thereby making it possible to carry out a setting of an optimum recording condition by test-writing, a check on a recording error by verifying, etc. As a result, high-density recording can be realized.

REFERENCES:
Engl. abstract of MOUTAI/TEAC App. No. 58-80138-A, pub. May'83.
Engl. abstract of FUJI+/SHARP App. No. 3-102601-A. pub. Apr.'91.
Engl. abstract of ISHIDA/MATSU. App. No. 4-30331-A, publ. Feb.'92.
T. Maeda, et al., "Characteristics of Read/Write on Magneto-Optical Disk," Technical Report of Inst. of Electronics Information & Communications Engineers MR 92-62 Japan (1992).
H. Fuji, et al., "Write Power Control Method for Multi-Pulse Recording", Technical Report of Inst. of Electronics, Information & Communications Engineers C-505, Japan (1994).

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