Dynamic information storage or retrieval – Storage medium structure – Optical track structure
Patent
1995-12-19
1997-06-17
Dinh, Tan
Dynamic information storage or retrieval
Storage medium structure
Optical track structure
369 94, 428 644, G11B 724
Patent
active
056403828
ABSTRACT:
A dual layer pre-recorded optical disc includes a transparent substrate, a partially reflective layer, a transparent spacer layer, and a highly reflective layer. One pattern of data pits is provided on the substrate, adjacent the partially reflective layer, and another pattern of data pits is provided on the spacer layer, adjacent the highly reflective layer. The partially reflective layer may be made of an alloy of gold and silver having a general formula Au.sub.x Ag.sub.y, where 15<x<40 and 60<y<85. A substrate-incident beam can be used to read data encoded in either data pit pattern depending on which layer the laser is focused upon. The dual layer disc has twice the data storage capacity of conventional single layer discs.
REFERENCES:
patent: 3946367 (1976-03-01), Wohlmut et al.
patent: 4219704 (1980-08-01), Russell
patent: 4385372 (1983-05-01), Drexler
patent: 4450553 (1984-05-01), Holster et al.
patent: 4493887 (1985-01-01), Peeters et al.
patent: 4735878 (1988-04-01), Hamersley et al.
patent: 4905215 (1990-02-01), Hattori et al.
patent: 5093174 (1992-03-01), Suzuki et al.
patent: 5126996 (1992-06-01), Iida et al.
patent: 5134604 (1992-07-01), Nagashima et al.
patent: 5171392 (1992-12-01), Iida et al.
patent: 5202875 (1993-04-01), Rosen et al.
patent: 5238722 (1993-08-01), Yashiro et al.
patent: 5251198 (1993-10-01), Strickler
patent: 5255262 (1993-10-01), Best et al.
patent: 5303224 (1994-04-01), Chikuma et al.
patent: 5303225 (1994-04-01), Satoh et al.
patent: 5540966 (1996-07-01), Hintz
"IBM Scientists Demonstrate Multilevel Optical Disks; Could Increase Optical Data Capacities 10-fold or More," IBM Press Release, May 12, 1994.
"New I.B.M. Laser Method Stacks Data on Disks," N.Y. Times, May 13, 1994.
Publication entitled "Double your capacity with DVD," by Dubs et al., Sep. 15, 1995.
Florczak Jeffrey M.
Hintz Michael B.
Dinh Tan
Imation Corp.
Levinson Eric D.
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