Optical disk and optical disk apparatus where information is rec

Details Optical disk and optical disk apparatus where information is rec Optical disk and optical disk apparatus where information is rec

1994-09-13

1995-10-17

Neyzari, Ali

Dynamic information storage or retrieval

Storage medium structure

Optical track structure

3692753, G11B 724

Patent

active

054597129

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..lambda./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
Preprint of 54th Lecture of the Institute of Applied Physics in Autumn 1993, p. 1009, K. Yamada et al: Sep. 27, 1993.
Sugaya, et al: "Performance of a 600 Mbyte 90 mm Phase-Change Optical Disk against Disk Tilt", JPN J. Appl. Phys., vol. 32 (1993) pp. 5402-5405.

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