Dynamic information storage or retrieval – Condition indicating – monitoring – or testing – Including radiation storage or retrieval
Patent
1996-12-04
1998-04-28
Tran, Thang V.
Dynamic information storage or retrieval
Condition indicating, monitoring, or testing
Including radiation storage or retrieval
369 54, 369 4426, 369 4429, G11B 700
Patent
active
057454612
ABSTRACT:
For initializing and setting operation mode of devices automatically, an automatic type discrimination system of an optical disk mounted on a optical disk unit of the invention comprises: reflection measurement means (3) for measuring reflectivity (101) of back surface of the optical disk (1) provided on an opposite side of the optical disk (1) to an optical head (2); focus sum signal converting means (4) for outputting a level of a focus sum signal (102) during focus searching operation; tracking signal converting means (5) for outputting a peak to peak value of a tracking signal (103); and a microcomputer (6) for estimating material, layer number and recording density of the optical disk (1) by comparing the reflectivity (101), the level of the focus sum signal (102) and the peak to peak value of the tracking signal (103), with reference values prepared therein.
REFERENCES:
patent: 5042020 (1991-08-01), Endo
patent: 5056075 (1991-10-01), Maruta et al.
patent: 5235581 (1993-08-01), Miyagawa et al.
patent: 5289451 (1994-02-01), Ashinuma et al.
patent: 5381392 (1995-01-01), Hira
NEC Corporation
Tran Thang V.
LandOfFree
Method and a system of optical disk auto-discrimination does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Method and a system of optical disk auto-discrimination, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Method and a system of optical disk auto-discrimination will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-1539815