Optical disk and optical disk apparatus

Details Optical disk and optical disk apparatus Optical disk and optical disk apparatus

1995-06-07

1997-01-07

Neyzari, Ali

Dynamic information storage or retrieval

Storage medium structure

Optical track structure

3692753, G11B 724

Patent

active

055924646

ABSTRACT:
An optical disk comprises a substrate, and a recording layer which is formed on the substrate and on which information is recorded at specific pitches in the form of pit trains, wherein the information is reproduced by projecting a light beam via an object lens, and when the wavelength of the light beam is .lambda..mu.m and the numerical aperture of the object lens is NA, the track pitch is set in the range of (0.72 to 0.8).times..lambda./NA/1.14 .mu.m, and each of the pits has a trapezoid cross section whose upper width is in the range of (0.3 to 0.5).times./NA/1.14 .mu.m and whose lower width is in the range of (0.2 to 0.32).times..lambda./NA/1.14 .mu.m or whose inner wall has an angle of 30.degree. to 70.degree..

REFERENCES:
patent: 4587648 (1986-05-01), Ando
patent: 4734904 (1988-03-01), Imanaka et al.
patent: 5060223 (1991-10-01), Segawa
patent: 5107486 (1992-04-01), Inui et al.
patent: 5274623 (1993-12-01), Usami et al.
patent: 5459712 (1995-10-01), Sugaya et al.
Pike, Dr. E., Principles of Optical Disc Systems, Ch. 2, "Read-out of Optical Discs", Sec. 2.23, 1985, pp. 17-19.
Terao et al., Fundamentals of Optical Memory, "Recordable and Erasable Optical Memory Medium", 1990, pp. 50-51.

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